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IV-87

HYDRAULIC UNITS

SELF-LEVEL VALVE

At Lowering of the Arm
<Arm Spool In, Bucket Spool Neutral>

Oil ejected from port B opens up plunger (8) and
ﬂows out from port A to go into the rod side of arm
cylinder (1). The oil ﬂowing out from the head side
returns to the tank.

At Bucket Tilt (Forward)
<Bucket Spool Out, Arm Spool Neutral>

The oil in the head side of bucket cylinder (4) ﬁrst
tries to ﬂow out from port D, but it is blocked by
plunger (9), and instead all oil from the pump ﬂows
into the head side of bucket cylinder (4). The oil
ﬂowing out from the rod side returns to the tank.

At Bucket Tilt (Rear)
<Bucket Spool In, Arm Spool Neutral>

The  oil  in  the  rod  side  of  bucket  cylinder  (4)  ﬁrst
tries  to  ﬂow  out  from  port  C,  but  it  is  blocked  by
unloading  spool  (5),  and  instead  all  oil  from  the
pump ﬂows into the rod side of bucket cylinder (4).
The oil ﬂowing out from the head side returns to the
tank.
The following is an explanation of the procedure to
be  followed  when  disassembling  the  self-leveling
valve.  Assembly should be performed following the
same procedure in reverse.

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Содержание TL150

Страница 1: ...TL150 Track Loader BOOK No CT7E901 WORKSHOP MANUAL Serial No 21500004...

Страница 2: ...vel motors is the rear Also the right and left sides of the operator when he is seated in the driver s seat are the right and left sides of the machine MACHINE SERIAL NUMBER The machine serial number...

Страница 3: ...0 3 I GENERAL II SPECIFICATIONS III MACHINE CONFIGURATION IV HYDRAULIC UNITS V TROUBLESHOOTING VI ENGINE...

Страница 4: ...0 4...

Страница 5: ...I 1 I GENERAL...

Страница 6: ...ety Precautions 3 Cautions during Disassembly and Assembly 9 Cautions during Removal and Installation of the Hydraulic Units 9 Cautions during Removal and Installation of Piping 10 Handling of Seals 1...

Страница 7: ...cessarily cover all safety measures For maintenance work each person must take adequate safety precautions against possible hazards present in the respective working environment Observe all safety rul...

Страница 8: ...y parts periodi cally Replace fuel hoses periodically Fuel hoses be come weaker over time even if they appear to be in good shape Replace important safety parts whenever an ir regularity is found even...

Страница 9: ...ands clothing and tools away from the rotating fan and running fan belts Securely block the machine or any com ponent that may fall Before performing maintenance or repairs under the machine set all w...

Страница 10: ...rer s approved cap Use of a non ap proved cap without proper venting may result in pressurization of the tank Never use fuel for cleaning purposes Use the correct fuel grade for the operating sea son...

Страница 11: ...ws or disconnect ing hoses stand to the side and loosen slowly to gradually release the internal pressure before removing Handling of the Accumulator High pressure nitrogen gas is enclosed in the accu...

Страница 12: ...cable Loose battery terminals may result in sparks Be sure to fasten terminals tightly Make sure the vent caps are tightened securely Do not charge a battery or jump start the engine if the battery i...

Страница 13: ...g it tight and leaving 1 or 2 threads bare Overlap the tape by about 10 mm SEALING TAPE LEAVE 1 OR 2 THREAD MARGIN Y2 A102E 10 When tting the snap rings the bigger rounder side of their circumferences...

Страница 14: ...s apply the maximum working pressure 5 or 6 times and con rm that there is no leakage HANDLING OF SEALS 1 Clean the grooves for O rings and if there is any burr etc remove it BURR DIRT Y2 A105E 2 Be c...

Страница 15: ...2 27 2 245 2 9 8 181 0 7 2 28 313 8 19 6 231 4 14 3 32 313 8 19 6 231 4 14 3 35 411 9 19 6 303 7 14 3 Hose Fitting Size Torque Union Nut G Taper Thread R N m ft lb N m ft lb 1 8 9 8 4 9 7 3 3 5 11 8 1...

Страница 16: ...94 1 9 3 1 196 1 19 2 144 7 14 3 171 6 17 2 126 6 12 5 Nominal Thread Diameter G Torque N m ft lb 1 8 19 6 2 0 14 5 1 4 1 4 34 3 4 9 25 3 3 5 3 8 53 9 4 9 39 8 3 5 1 2 63 7 4 9 47 0 3 5 3 4 93 2 4 9 6...

Страница 17: ...7 5 6 0 28 40 5 2 0 M12 1 75 83 4 4 1 8 5 0 42 61 5 3 0 97 1 4 8 9 9 0 49 71 6 3 5 M14 2 0 134 4 6 7 13 7 0 68 99 1 4 9 155 9 7 7 15 9 0 79 115 0 5 7 M16 2 0 207 9 10 4 21 2 1 06 153 3 7 7 241 2 12 1...

Страница 18: ...I 14 GENERAL...

Страница 19: ...II 1 II SPECIFICATIONS...

Страница 20: ...ic equipment drops and this is the estimated value indicating the use limit for the respective part It is decided under refer ence to the standard at the time of shipping the results of various tests...

Страница 21: ...Safety Bar 6 Pilot Valve L H 7 Pilot Valve R H 8 HST Pump 9 Bucket Cylinder 10 Fuel Tank 11 Arm Cylinder 12 Travel Motor 13 Track Roller 14 Track 15 Idler 16 Quick Hitch 17 Bucket 18 Control Valve Sub...

Страница 22: ...85 B 3135 C 1555 D 2350 E 355 F 1860 G 450 H 1570 J 985 K 1960 L 580 M 31 Machine Dimensions L M D J H K C F G A E B T7K001A D H K C F A E B J G T7K002A Unit mm Standard Bucket Steel Tracks A 4255 B 3...

Страница 23: ...555 D 2350 E 355 F 1860 G 450 H 1570 J 985 K 1960 L 580 M 31 Machine Dimensions L M D J H K C F G A E B T7K001A D H K C F A E B J G T7K002A Unit mm Standard Bucket Steel Tracks A 4255 B 3210 C 2440 D...

Страница 24: ...bucket mm 1560 Rear Clearance Radius mm 1755 Overall Width of Crawler mm 1860 Overall Length of Crawler mm 2150 Bucket Width mm 1960 Angle of Departure degree 31 Working Range Maximum Lift Height to B...

Страница 25: ...Clearance Radius mm 1755 Overall Width of Crawler mm 1860 Overall Length of Crawler mm 2150 Bucket Width mm 1960 Angle of Departure degree 31 Working Range Maximum Lift Height to Bucket Pin mm 3210 Ma...

Страница 26: ...1 Type Variable displacement type double axial piston Displacement cm3 rev 41 0 41 0 Delivery L min 90 2 90 2 Relief Valve Pressure Setting MPa 34 5 Charge Relief Valve Pressure Setting MPa 2 26 0 02...

Страница 27: ...cient Ports D 63 Ports B 37 Rated Flow L min 88 0 Rated Pressure MPa 20 6 Maximum Working Pressure MPa 24 5 Cylinder Arm Bore Diameter Rod Diameter mm 75 45 Stroke mm 760 Fully Retracted Length Pitch...

Страница 28: ...c Tank Assembly 51 Fuel Tank Assembly 28 Control Valve 10 Control Valve High Flow 12 Control Valve Sub 12 Pilot Valve R H 2 3 L H 2 3 Self Level Valve 4 5 Canopy Cab 220 270 Lift Arm 420 Quick Hitch 8...

Страница 29: ...o prevent fuel ow problems in cold weather use die sel fuel with a pour point of at least 12 C 10 F below the lowest expected ambient temperature Minimum cetane number is 45 Low temperature or high al...

Страница 30: ...ension Allowable Value Replace A Tread Outer Diameter 188 180 B Width of Tread 36 5 40 5 Basic Dimension Allowable Tolerance Standard Allowable Shaft Hole C Shaft and Bushing Bore Diameter Clearance 4...

Страница 31: ...Value Replace A Tread Outer Diameter 188 180 B Width of Tread 37 5 45 5 Basic Dimension Allowable Tolerance Standard Allowable Shaft Hole C Shaft and Bushing Bore Diameter Clearance 40 0 050 0 075 D...

Страница 32: ...meter 300 292 B Width of Tread 36 5 40 5 Basic Dimension Allowable Tolerance Standard Fit Allowable Fit Shaft Hole C Shaft and Bearing Bore Diameter Interference 40 0 0 016 0 0 012 0 016 0 012 D Rolle...

Страница 33: ...ocket Unit mm Code Item Designated Standard Servicing Procedure Basic Dimension Allowable Value Replace A Sprocket Teeth Pro le Wear 14 4 6 4 B Sprocket Teeth Width 45 41 C Sprocket Outer Diameter 432...

Страница 34: ...er Tread 390 380 B Width of Tread 33 4 38 4 Basic Dimension Allowable Tolerance Standard Allowable Shaft Hole C Shaft and Bearing Bore Diameter Clearance 45 0 0 011 0 0 012 0 011 0 012 D Idler and Bea...

Страница 35: ...ack Adjuster Unit mm Code Item Designated Standard Servicing Procedure Basic Value Allowable Value Length when Free mm 270 A Coil Spring Length when Installed mm 224 5 Replace Set Load kN 41 5 B Check...

Страница 36: ...A Lift Arm Frame 45 0 06 0 09 0 17 0 12 0 18 0 26 1 0 B Arm Cylinder Frame 45 0 06 0 09 0 20 0 05 0 11 0 29 1 0 C Arm Cylinder Lift Arm 45 0 06 0 09 0 20 0 05 0 11 0 29 1 0 D Bucket Cylinder Lift Arm...

Страница 37: ...ght Speed s 10 1 0 5 12 0 Travel Speed 10 m Low Speed s 6 4 0 5 7 5 Hight Speed s 4 4 0 4 5 4 Travel Curve mm 125 0 500 Natural Travel Drop Engages Parking Brake mm 0 Releases Parking Brake mm Cylinde...

Страница 38: ...art up the hydraulic circuit to be tested and measure the re lief pressure Circuit Pressure Detection Port Relief Valve Port Position Size Left Travel forward P1 G1 4 R1 Right Trav el forward P2 G1 4...

Страница 39: ...e relief valve once more to con rm that the pressure that has been set it stabilized Charge pressure Measuring Method Engine Idling Maximum R P M Hydraulic Oil Temp 50 60 C Insert the pressure gauge i...

Страница 40: ...e tracks rotate a total of ve revolutions This test should be performed at the same speed in which the machine was last oper ated Travel Speed 10m Engine Maximum R P M Hydraulic Oil Temp 50 60 C Measu...

Страница 41: ...ion This time should not include the time allowed for op eration of the cushion Bucket Cylinder Speed Engine Maximum R P M Hydraulic Oil Temp 50 60 C Measurement Posture Make sure that the bucket pin...

Страница 42: ...ly extended position This time should not include the time allowed for op eration of the cushion Bucket Cylinder Speed Engine Maximum R P M Hydraulic Oil Temp 50 60 C Measurement Posture Make sure tha...

Страница 43: ...er pedal Track Tension In a stable level location lower the lift arm tilt the bucket forward and lift the front of the tracks slightly off the ground Measure the distance be tween the bottom surface o...

Страница 44: ...III 1 III MACHINE CONFIGURATION...

Страница 45: ...III 2 MACHINE CONFIGURATION CONTENTS Drive System 3 Travel System 16 Frame 22 Control System 34 Attachments 37 Hydraulic System 46 Electrical System 51 Air Conditioner System 54...

Страница 46: ...gine Mount A 256 N m Apply thread locking compound B 110 N m Apply thread locking compound C 5 9 N m D 3 9 N m 1 Engine Foot FL 2 Engine Foot FR 3 Engine Foot RL 4 Engine Foot RR 5 Exhaust Pipe 6 Brac...

Страница 47: ...CONFIGURATION DRIVE SYSTEM Radiator A 4 9 N m B 39 2 N m 1 Radiator 2 Radiator Hose Upper 3 Radiator Hose Lower 4 Sub Tank 5 Sensor 6 Oil Cooler 7 Drain Valve 8 Drain Hose 9 Drain Hose 10 Hose 11 Joi...

Страница 48: ...501587 A 256 N m Apply thread locking compound B 110 N m Apply thread locking compound C 5 9 N m D 3 9 N m 1 Engine Foot FL 2 Engine Foot FR 3 Engine Foot RL 4 Engine Foot RR 5 Exhaust Pipe 6 Bracket...

Страница 49: ...URATION DRIVE SYSTEM Radiator High Flow Serial No 21501587 A 4 9 N m B 39 2 N m 1 Radiator 2 Radiator Hose Upper 3 Radiator Hose Lower 4 Sub Tank 5 Sensor 6 Drain Valve 7 Drain Hose 8 Drain Hose 9 Hos...

Страница 50: ...ump coupling connects the engine ywheel and the hydraulic pump s drive shaft It is constructed so that it absorbs vibrations torsions impact and out of center of the engine and hydraulic pump Refer to...

Страница 51: ...III 8 MACHINE CONFIGURATION DRIVE SYSTEM 1 Fuel Tank 2 Cap 3 Strainer 4 Drain Plug 5 Fuel Sender 6 Water Separator 7 Feed Pump Fuel Tank and Lines...

Страница 52: ...III 9 MACHINE CONFIGURATION DRIVE SYSTEM 1 Lever 2 Bracket 3 Accelerator Wire 4 Wire Stopper 5 Wire Stopper 6 Conical Washer 7 Washer 8 Washer Engine Control A Apply molybdenum disul de grease...

Страница 53: ...and the lter 4 9 Remove the fuel inlet pipe 5 10 Disconnect the fuel hoses 6 11 Disconnect the battery cable 7 and all the con nections on the engine side of the electric wir ings 8 Attach identi cati...

Страница 54: ...lts 2 and open the radiator 3 3 Disconnect the radiator hoses upper 4 and lower 5 and hoses 6 from the radiator 4 Remove the R pins and pull out the pins 7 5 Remove the radiator 3 Installing the Radia...

Страница 55: ...enum disul de grease to the spline section Installing the Hydraulic Pump Follow the same procedure as for removal in the reverse order Purging Air from the HST Pump WARNING When re tting the HST pump...

Страница 56: ...e the oil ow from only the pilot valves into the tank 4 Remove the plugs in the pilot ports X1 and X11 and immediately connect the respective hoses to those ports to prevent unnecessary loss of hydrau...

Страница 57: ...he Hydraulic Pump 5 Remove the suction pipe 2 6 Loosen the drain cock 3 to drain out the fuel Fuel tank capacity 108 L 7 Disconnect the fuel sender connector 4 8 Disconnect the fuel hoses 5 and the ho...

Страница 58: ...with the wire lock pin 6 4 Move the throttle lever 1 to the B full throttle position and the governor control 4 to the D full throttle position Adjust the stopper 7 so that the throttle lever 1 hits...

Страница 59: ...Track Roller A 1 Roller 2 Shaft 3 Cover 4 Floating Seal 5 Snap Ring 6 O ring 7 Oil Filler Plug A 241 N m Apply thread locking compound Track Roller B 1 Roller 2 Shaft 3 Cover 4 Floating Seal 5 Snap Ri...

Страница 60: ...ing 6 Floating Seal 7 Oil Filler Plug A 156 N m Apply thread locking compound B 55 N m Apply thread locking compound C 20 N m Idler 1 Idler 2 Shaft 3 Cover A 4 Cover B 5 Bearing 6 Floating Seal 7 Oil...

Страница 61: ...CHINE CONFIGURATION TRAVEL SYSTEM Track Adjuster 1 Yoke 2 Reach Rod 3 Spring 4 Piston 5 Cylinder 6 Grease DischargeValve A 59 N m Travel Motor 1 Travel Motor 2 Sprocket A 241 N m Apply thread locking...

Страница 62: ...der the machine rear 5 Rotate the travel motor slowly in the reverse direction to remove the track Track 401 kg Installing the Steel Track 1 Place the wooden blocks 3 with a height of 20 cm under the...

Страница 63: ...with the ground then tighten the bolts Bolt 241 N m track rollers A and B Bolt 156 N m track roller C Apply thread locking compound 3 Raise the machine body then adjust the track tension Removing the...

Страница 64: ...41 N m Apply thread locking com pound 3 Remove the cover and disconnect the hydraulic hoses 4 4 Suspend the travel motor 3 temporarily and remove the bolts 5 Bolt 241 N m Apply thread locking com poun...

Страница 65: ...III 22 MACHINE CONFIGURATION FRAME FRAME CONSTRUCTION Frame 1 Frame 2 Under Cover A 3 Under Cover B 4 Cover L 5 Cover R 6 Under Cover C 7 Cover 8 Cover...

Страница 66: ...III 23 MACHINE CONFIGURATION FRAME 1 Floor Plate 2 Floor Mat 3 Cover R 4 Cover L 5 Foot Rest 6 Cover C 7 Floor Stay 8 Cover 9 Floor Stay Floor Frame...

Страница 67: ...III 24 MACHINE CONFIGURATION FRAME 1 Safety Bar 2 Bracket L 3 Bracket R 4 Stopper 5 Proximity Switch 6 Cover L 7 Cover R 8 Gas Spring Safety Bar...

Страница 68: ...III 25 MACHINE CONFIGURATION FRAME 1 Rear Door 2 Engine Hood 3 Bracket 4 Plate 5 Plate 6 Plate 7 Pin Cover 8 Gas Spring 9 Rod 10 Side Cover L 11 Side Cover R 12 Center Cover 13 Plate...

Страница 69: ...III 26 MACHINE CONFIGURATION FRAME 1 Canopy 2 Bolt Assembly 3 Cushion Rubber 4 Pin Assembly 5 Collar Canopy 6 Washer 7 Cushion Rubber 8 Washer 9 Gas Spring 10 Cushion Rubber...

Страница 70: ...III 27 MACHINE CONFIGURATION FRAME 1 Cab 2 Bolt Assembly 3 Cushion Rubber 4 Pin Assembly 5 Collar Cab 6 Washer 7 Cushion Rubber 8 Washer 9 Gas Spring 10 Cushion Rubber...

Страница 71: ...nt to the ground and stop the engine 2 Set the safety bar to the lock position 3 Remove a R pin and remove the sopper pin B 4 Remove the lock bolts A 5 Solwly raise the canopy 6 Insert the stopper pin...

Страница 72: ...e oor mat 4 Remove the auxiliary pedal a Remove the screws 2 and the pedal 3 Apply thread locking compound b Remove the bolts 4 and pilot valve c Remove the bolts and plate 5 5 Remove the bolts and oo...

Страница 73: ...hoses 6 and electrical wiring 7 Drain the oil from the tank Remove the Hydraulic Tank 5 Loosen the drain cock to drain out the fuel Removing the Fuel Tank 6 Disconnect the fuel hoses 8 7 Lift up the r...

Страница 74: ...the electric wiring 1 for the cano py 6 Remove the gas springs 2 and installation pins 7 Lower the canopy and the lift arms to the ground 8 Remove the xing bolts on the 2 rear positions B 9 Suspend th...

Страница 75: ...el ground and remove the bucket 2 Lower the lift arms to the ground and stop the engine 3 Remove the rear R pin 4 from the locking pin 1 4 Support the lift arm stop 2 by hand and pull out the locking...

Страница 76: ...Sit in the seat fasten the seat belt start the en gine and lower the safety bar 5 Raise the lift arms slowly until the spring 3 will lift the lift arm stop 2 off the cylinder rod 6 Lower the lift arm...

Страница 77: ...ve 4 Control Valve Sub 5 Solenoid Valve 6 HST Pump 7 Hydraulic Tank 8 Pilot Valve Auxiliary 9 Shuttle Valve CONTROL SYSTEM CONSTRUCTION Hydraulic Pilot Unit 1 2 zTable of Connectionsz 1 1 Pa2 3 1 2 Pb...

Страница 78: ...ft Pilot Valve 3 Control Valve 4 Control Valve Sub 5 Solenoid Valve 6 HST Pump 7 Hydraulic Tank 8 Pilot Valve Auxiliary 9 Shuttle Valve Hydraulic Pilot Unit 2 2 zTable of Connectionsz 5 A B 9 5 B Pb32...

Страница 79: ...Attach identi cation labels to individual hoses for correct reassembling c Disconnect the electric wiring 3 e Remove the bolts and bracket L 4 4 Remove the lever stand R a Remove the cover 5 b Disconn...

Страница 80: ...III 37 MACHINE CONFIGURATION ATTACHMENTS ATTACHMENTS CONSTRUCTION 1 Bucket 2 Quick Hitch 3 Lift Arm 4 Bucket Cylinder 5 Arm Cylinder T7C600 5 3 2 1 4...

Страница 81: ...MENTS 1 Bracket 2 Bracket 3 Bracket 4 Bracket 5 Pipe Bucket Piping 1 2 Piping 2 2 6 Pipe Bucket 7 Pipe Auxiliary 8 Pipe Auxiliary 9 Control Valve 10 Self Level Valve 11 Solenoid Valve 12 Stop Valve 13...

Страница 82: ...racket 4 Bracket 5 Pipe Bucket 6 Pipe Bucket Piping High Flow 1 2 Piping High Flow 2 2 7 Pipe Auxiliary 8 Pipe Auxiliary 9 Control Valve 10 Self Level Valve 11 Solenoid Valve 12 Stop Valve 13 Hydrauli...

Страница 83: ...operated for the rst time after reassembly be sure the bleed the air out of the hydraulic circuits by the following procedure Air Bleeding Operation 1 Start the engine and let it idle for about 5 min...

Страница 84: ...e pins 8 from the rod side of the arm cylinders 6 Set the arm cylinders onto a crosstie before removing the pillow blocks 9 4 Remove the arm foot pins 10 use a cable to lift up the lift arms 7 and rem...

Страница 85: ...19 63750 1 Lock Pin 3 Part Number Quantity 08816 02700 1 Installing the Arm Stopper Install the arm stopper 2 to support the lift arm in place for adjusting the bucket stopper 1 Park the machine on a...

Страница 86: ...alling off Adjusting the Bucket Stoppers Loosen the lock nuts 7 and screw in the stopper bolts 8 fully 1 Start the engine slowly extend the bucket cylin ders to the maximum length and then stop the en...

Страница 87: ...that the frame presses against the right and left stoppers 1 at the same time when it is lowered 1 Raise the lift arm and securely lock it with the lift arm stopper 2 III 28 28 2 2 Remove the Allen bo...

Страница 88: ...e note of the clearance A on the right and the left side 7 Install the stopper 1 and the shim 3 to each of the right and left frames and fasten them with the Allen bolts The shim must be such that the...

Страница 89: ...4 3 3 5 3 3 6 5 1 5 4 45 1 5 5 3 44 0 00 3 7 7 1B 1B 1 1 1 1 1B BU NJO 1B BU NJO 1B BU NJO 1B BU NJO 1B BU NJO 0 9 9 9 9 0 3 16 1 NJO 150 9 3 5 7 5 L8 NJO 5 53 7 0503 3 5 53 7 0503 8 3 038 3 8 3 038 3...

Страница 90: ...ION HYDRAULIC SYSTEM CONSTRUCTION Hydraulic Tank 1 Hydraulic Tank 2 Suction Pipe 3 Bracket 4 Bracket 5 Suction Strainer 6 Air Breather 7 Sight Gauge 8 O ring 9 O ring 10 Plug 11 Flange A 47 1 N m Appl...

Страница 91: ...ket cutting edge lowered to the ground Reference If the amount of hydraulic oil is insuf cient the dis turbances in the ow of oil can not be calmed and this will result in air bubbles getting in the h...

Страница 92: ...oses 3 from hydrau lic tank Next remove the bushings 6 hoses 4 Disconnect the suction hoses 4 from the hy draulic tank 5 Remove the plug 5 6 Remove the bolts suction pipe 6 and ange 7 7 Remove the sig...

Страница 93: ...is about 50 to 80 C The level should be near the upper limit H Bleeding the air After replacing the hydraulic oil bleed the air from the hydraulic circuit and hydraulic devic es Failure to do so may...

Страница 94: ...III 51 MACHINE CONFIGURATION ELECTRICAL SYSTEM ELECTRICAL SYSTEM ELECTRICAL WIRING DIAGRAM...

Страница 95: ...RATION ELECTRICAL SYSTEM Electricals 1 Relay Assembly 2 Wire Harness Assembly 3 Fusible Link 4 Diode 5 Fuse 10A 6 Fuse 20A 7 Fuse 30A 8 Fuse 80A 9 Wire Harness 10 Resistor 11 Horn 12 Buzzer 13 Heater...

Страница 96: ...III 53 MACHINE CONFIGURATION ELECTRICAL SYSTEM Relay Assembly 1 Box 2 Resistor 3 Relay Assy 4 Timer Unit 5 Timer Unit 6 Relay 7 Detector 8 Relay...

Страница 97: ...ulley 2 Valve 3 Bracket 4 Shaft 5 Collar 6 Compressor 7 Pulley A Allow a clearance B Press on the center of the belt with a nger The belt s tension is normal if it bends about 8 mm when pressed with a...

Страница 98: ...III 55 MACHINE CONFIGURATION AIR CONDITIONER SYSTEM 1 Hose 2 Hose 3 Hose 4 Hose 5 Bracket 6 Receiver Dryer 7 Pressure Switch 8 Condenser 9 Wire Harness Compressor Assembly 2 4...

Страница 99: ...ONER SYSTEM 1 Cover 2 Cover 3 Cover 4 Bracket 5 Bracket 6 Bracket 7 Air Conditioner Unit 8 Panel Compressor Assembly 3 4 A 1 8 N m B Apply thread locking compound 9 Control Cable 10 Tube 11 Box 12 Tub...

Страница 100: ...CONFIGURATION AIR CONDITIONER SYSTEM 1 Condenser Assembly 2 Condenser 3 Motor 4 Guard 5 Air Conditioner Unit 6 Core 7 Core 8 Filter 9 Louver 10 Motor 11 Thermostat 12 Valve 13 Box 14 Filter Compresso...

Страница 101: ...er systems They illustrate system advantages and disadvantages explained in the paragraphs that follow The HVAC system includes both heater and air conditioner components usually a common control and...

Страница 102: ...em Operation We have described the movement of heat energy and basic HVAC system function in Chapter 1 Now we will go into some detail on how an air conditioner operates The system is sealed to keep o...

Страница 103: ...s a liquid The compressor also sucks the vaporized refrigerant out of the evaporator and back inside itself in the form of gas One way valves inside the compressor separate the compressed gas high pre...

Страница 104: ...ter at 212 degrees Fahrenheit Heat energy was involved in the change of state but the temperature did not change The same kind of action happens inside the AC system The refrigerant gas gives up a lot...

Страница 105: ...drier Figure 2 6 also separates gas bubbles from the liquid with a pick up tube as shown in this illustration Some receiver driers have a spring to preload the desiccant pack Figure 2 5 As the refrig...

Страница 106: ...ng and sensing tube expands when it gets warmer and forces the expansion valve open at the metering ori ce 5 Evaporator Coil The expansion valve or other type of metering device bleeds high pressure r...

Страница 107: ...or can turn the system on and off regulate the air velocity with the blower control and in some designs adjust the thermostat control The system and component operating range settings automatically cy...

Страница 108: ...ide of the water pump or to the radiator A control cable attached to a water valve between the water pump and the heater inlet is used to control the ow of coolant to the heater The heater fan or blow...

Страница 109: ...or pulled through the core depending on sys tem design Blower or fan speed is usually selected by the operator Environmental Effects on System Operation The environment outside the cab involves more t...

Страница 110: ...sealed pressurized systems The normal air conditioner operat ing pressure ranges from 150 to 250 pounds per square inch sometimes higher with a different refrigerant Air conditioners have a high and a...

Страница 111: ...e serviced every six months or less and another 62 are serviced at least once a year The survey also covered how often the different components required maintenance Figure 7 1 below shows survey nding...

Страница 112: ...AC system been in use Did the operator or work order explain or describe any problems about the system Did someone else work on the system yesterday 700 miles down the road Your rst inspection step is...

Страница 113: ...to see if the sight glass has a moisture indicator that is showing moisture in the system B Components Under the Hood Tip the cab or raise the hood Look at the compressor mounting bracket compressor...

Страница 114: ...ld be often near the condenser All of these spots are potential leak or damage points Tighten re fasten add or replace as indicated by your inspection 4 Check for Refrigerant Leaks System refrigerant...

Страница 115: ...at rest Electrical System Inspection The two stages of an electrical inspection are explained in more detail below 1 Inspect Electrical Connections 2 Check Electrical Current Flow and Device Functions...

Страница 116: ...t sure the clutch is engaged look for the lead wire connector near the clutch Break and close that connection The clutch will disengage and engage again E Test Blower Speed Operation Some systems have...

Страница 117: ...m performance testing will be much faster if all doors and windows in the cab are closed The cab air must cool down to thermostat control setting lev els before system components will cycle on and off...

Страница 118: ...eel the suction and discharge lines and note their change in tempera ture The discharge line will get hot after a while it may be to hot to touch and the suction line will get cooler 3 Check Sight Gla...

Страница 119: ...nt before re lling with clean water and anti freeze Coolant must be hot when using the hydrometer to check protection freeze up level The following inspection procedures are explained in more detail b...

Страница 120: ...cked with the pressure and thermostat testers as de scribed in Chapter 6 A hand pump pressure tester can also be used to check for coolant leaks This is done by using the pump to raise the pressure in...

Страница 121: ...t take more than 15 to 20 minutes unless com ponent replacement and or complete system evacuation and recharging is warranted The survey results shown in Figure 7 1 indicate belts compressor clutch as...

Страница 122: ...III 79...

Страница 123: ...nd it s OK The air conditioner is repaired right Wrong What you did is add refrigerant and the problem went away You did not nd and x the cause of the problem Component failure in an air conditioning...

Страница 124: ...do and are not too proud to ask for help or suggestions when needed The key understanding system function The Key Understanding System Function Your complete understanding of AC and heater systems an...

Страница 125: ...eat energy from the cab to the outside air for occupant comfort The automatic functions of the thermostat or the pressure valve on some accumu lators and the expansion valve help maintain pressures an...

Страница 126: ...about these possibilities and others when you talk to the operator before he has the chance to leave The right kind of questions can speed up troubleshooting and your service work by pinpointing the p...

Страница 127: ...mponents that should be serviced You could x the probable causes and the system might work and then break down again as the rig drives out of your place From your knowledge and what the operator has j...

Страница 128: ...l the valves on the manifold are closed all the way turn them clockwise Check the hose connections on the manifold for tightness Locate the low and high side system service ttings and remove their pro...

Страница 129: ...ead system pressure when the hand valves are closed if the hose end valves and the stem type service valves if included are open 2 Adding Refrigerant to the System Now that the gauges are connected yo...

Страница 130: ...erant to the system For your safety and to prevent system damage use the following procedure 1 Turn on the engine and set the idle at 1200 to 1500 RPM and then turn on the air conditioner Do not open...

Страница 131: ...han that amount you should stop and check again for leaks Then re cover all of the refrigerant repair evacuate and recharge the air conditioner See Chapter 9 You may want to add dry nitrogen gas to th...

Страница 132: ...ow found under normal operating conditions When a vehicle has a tilt cab or hood and the condenser is part of the grill you must use the oor fan to get air to the condenser You could tilt the cab or...

Страница 133: ...from vents in the cab seems warm If there is a low pressure or Trinary switch in the system it may have shut off the compressor clutch Cause Extremely low or no refrigerant in the system There is a le...

Страница 134: ...ch may not cycle the clutch on and off so the low pressure gauge will not uctuate Cause Air and or moisture in the system RepairProcedure Test for leaks especially around the compressor shaft seal are...

Страница 135: ...system replace the receiver drier or accumulator The desiccant is saturated with moisture Check and replace any compressor oil lost due to leakage Evacuate and recharge the system then check AC operat...

Страница 136: ...tion pressure on the gauge This indicates the valve was part way open and that your action closed it Repeat the test but rst warm the valve diaphragm or capillary with your hand If the low side gauge...

Страница 137: ...refrigerant may be ooding the evapora tor making it impossible for the refrigerant to vaporize and absorb heat normally In vehicles where the TXV and sens ing bulb are accessible check the capillary t...

Страница 138: ...er all refrigerant from the system and replace the expansion valve and the receiver drier Evacuate and recharge the system with refrigerant then check AC operation and per formance System High Pressur...

Страница 139: ...may be a worn or loose compressor clutch drive belt Repair Procedure If you nd the belt worn or loose replace or tighten it and recheck system performance and gauge readings To in spect and service th...

Страница 140: ...ou install a new or rebuilt unit Tighten all connections and evacuate the system Recharge the air conditioner with re frigerant and check system operation and performance Note Rotary compressors have...

Страница 141: ...tter assembly Replace any defective parts and then recheck AC system operation gauge readings and performance If the problem continues the system may be over charged have too much refrigerant inside R...

Страница 142: ...not inserted between the evaporator ns in the proper position Cause The thermostatic switch is not functioning properly or at all Repair Procedure Replace the thermostatic switch When you remove the o...

Страница 143: ...g problems are discussed in more detail in this section 1 Belts and Compressor Clutch 2 Condenser 3 Refrigerant Lines Hoses and Fittings 4 Refrigerant Metering Valves 5 Other Problems 1 Belts and Comp...

Страница 144: ...cked by ozone oxygen in the air Rubber parts break down slowly and become more vulnerable to the effects of vibration with the passage of time Heavy duty vehicle vibration causes stress on all lines t...

Страница 145: ...the leak The shaft rotation exerts force all around the seal and puts life back into it To prevent this from happening manufacturers recommend regular AC system operation a minimum of every couple of...

Страница 146: ...MACHINE CONFIGURATION III 103...

Страница 147: ...IV 1 IV HYDRAULIC UNITS...

Страница 148: ...S CONTENTS HST Pump 3 Gear Pump 33 Gear Pump High Flow 40 Control Valve 44 Control Valve High Flow 56 Control Valve Sub 64 Pilot Valve 71 Pilot Valve Auxiliary 81 Self level Valve 85 Cylinders 92 Trav...

Страница 149: ...ring 8 O ring 9 Swash Plate 10 Seal Carrier HST PUMP CONSTRUCTION Pump Assembly 1 4 11 Seal Carrier 12 Cover 13 Pin 14 Gasket 15 Plug 16 Ring 17 Cylinder Block 18 Valve Plate 19 Coupling 20 Coupling...

Страница 150: ...IV 4 HYDRAULIC UNITS HST PUMP Pump Assembly 2 4 1 Plug 2 Pin 3 Adjuster 4 O ring 5 Spring 6 Poppet 7 Nut T7D101E 2 3 7 5 6 4 A A L L SECTION L L SECTION E E E E 1...

Страница 151: ...T PUMP 1 Ori ce 2 Gasket 3 Plug 4 Valve 5 Spring 6 O ring 7 Backup Ring 8 O ring 9 Plug 10 Plug 11 Cover Pump Assembly 3 4 12 Screw 13 Seal Nut 14 Plug 15 Cover 16 Plug 17 Plug 18 Backup Ring 19 Pisto...

Страница 152: ...IV 6 HYDRAULIC UNITS HST PUMP 1 Plug 2 Plug 3 Plug 4 Screw 5 Seal Nut 6 Plug Pump Assembly 4 4...

Страница 153: ...piston 2 connection to cylinder block 1 to follow along with swash plate 7 to move in a back and forth motion and causes the intake and exhaust pumps to begin working Thus the nine pistons 2 perform a...

Страница 154: ...1 is connected by piston 2 to control cylin der 3 the mechanism tilts to match the degree of stroke for control cylinder 3 and the pump begins to exhaust Thus the pumping capacity of the pump may be...

Страница 155: ...If the pressure in the charge circuit 1 becomes higher than that in the closed circuit 2 a gap is generated between the check valve 4 and the spring holder 3 and so the oil ows into the closed circuit...

Страница 156: ...o remove any burrs sharp edges etc Do not turn adjusting screws if not required Apply hydraulic oil to sliding surfaces and apply a thin coating of grease to seals when assembling them Disassembly Pum...

Страница 157: ...he shaft assembly Grasp the spline of the shaft assembly and pull it up 6 Remove the side cover a Remove the six cap screws b Remove the side cover 9 Press down the swash plate 10 by the handle of a r...

Страница 158: ...te is hard to remove use a at head driver Take care not to damage the valve plate 11 Remove the timing pin 14 of the valve plate 12 Remove the servo cover 15 a Remove the ve cap screws b Remove the se...

Страница 159: ...ic pump P1 a Remove the six cap screws and take out the B pad adapter 22 If the adapter is hard to remove slightly tap on the adapter with a rubber hammer b Remove the O rings 17 Remove the A pad adap...

Страница 160: ...and the retainer 32 from the cylinder block 36 b Remove the ball guide 33 and take out three hold down pins 35 c Remove the retainer ring 34 from the cylin der block 36 21 Disassemble the cylinder blo...

Страница 161: ...re vent it from turning Tighten the nut until no load is applied to the snap ring 48 d Remove the snap ring 48 e Remove the spring assembly f Remove the nut 49 g Remove the spring guide 51 the spring...

Страница 162: ...ve plug mark the plug lock nut 5 and housing so as to approximately maintain the original adjustment when assembling a Remove the screw adjustable charge relief valve plug 6 by loosening the lock nut...

Страница 163: ...ng 48 and the tie bolt 16 rotates freely f Adjust the rotational torque of the servo pis ton IV 24 2 Assemble the cylinder block Lubricate individual components of the cyl inder block with hydraulic o...

Страница 164: ...vidual components are assembled in place 4 Install the positioning pins 29 5 Install the drive coupling 27 6 Install the B pad adapter on the side of the hy draulic pump P1 as follows a Install the O...

Страница 165: ...utes and let the piston ring 21 contract c Install the servo piston 20 in such a way that the tie bolt 16 is installed at the marker side Make sure that the hole for installing the swash plate bearing...

Страница 166: ...cover 15 d Tighten them manually with the ve cap screws e Tighten the cap screws on both sides of the tie bolt to the stipulated torque by using a torque wrench Cap Screw 15 17 5 N m 10 Install the ad...

Страница 167: ...ing into the carrier 12 Make sure the surface attached with the bearing number projects 0 00 to 0 38 mm out of the carrier surface b Install the carrier 12 to the swash plate 10 14 Install the swash p...

Страница 168: ...t corner counterclock wise Make sure the swash plate does not in terfere with the side cover and the needle bearing Cap Screw 15 17 5 N m 17 Install the shaft assembly to the housing Make sure the cyl...

Страница 169: ...le securing the pump with a vise If the turning is not smooth reassemble it again Idle run torque 12 4 N m or less 23 Assemble the pumps P1 and P2 and the gear pump a Attach the O ring to the B pad ad...

Страница 170: ...es sure relief valve assemblies 2 into the pump housing The conical springs MUST be correctly positioned on the check poppets or relief valves after installation for proper pump operation c Install th...

Страница 171: ...e valve plate must be at least 0 152 in 3 86 mm The sliding surface and the rear surface must be smooth The parallel accuracy must be at least 0 00098 in 0 0249 mm The atness of the valve plate must b...

Страница 172: ...laced as a cover assembly or a housing assem bly The bearings must rotate smoothly If the presence of foreign matter is suspected clean the bearing and lubricate it with hydraulic oil When reassemblin...

Страница 173: ...orque Nut 20 27 N m Measurement of the Servo Piston s Rota tional Torque Check whether the servo piston s rotational torque is properly adjusted 1 Secure the servo piston 20 with your hand to prevent...

Страница 174: ...c hoses to the gauge ports to make the pressures on both sides of the servo piston equal Hydraulic pump P1 M4 and M5 Hydraulic pump P2 M14 and M15 2 Install the pressure gauges to the ports to mea sur...

Страница 175: ...above Make sure the readings on the two pressure gauges are equal 8 Tighten the tie bolt 16 by the adjusting seal nut 18 Do not allow the tie bolt to rotate Adjusting seal nut 28 51 N m 9 Stop the eng...

Страница 176: ...ng traveling Improper adjustment of the displacement limiter may cause track deviation By adjusting the displacement limiter limit the maximum gradient of the swash plate and control the discharge vol...

Страница 177: ...replace Repair or replace Machine operates neither in forward nor reverse Fails to move in a straight line in for ward The level in the hydraulic tank is low Bad pilot valve Insuf cient pressure being...

Страница 178: ...oil level in the tank is low The suction side pipe or the suction lter is clogged The amount of leakage from hydraulic devices other than the pump is increas ing Operate the engine at the speci ed spe...

Страница 179: ...hich is a drive gear 1 and a driven gear 2 engaged with each other By turning the drive shaft 3 the space between the case and the gears is lled with oil This oil is thus sent through the pump from th...

Страница 180: ...with new ones each time the pump is disassembled coating them lightly with grease Check each part to make sure there is no abnormal wear or seizing and use sandpaper etc to remove any burrs sharp edge...

Страница 181: ...riginal places Be careful not to scratch or otherwise damage the inside of the housing 7 Disassemble the rear housing according to the same procedure as followed for the front hous ing 8 Remove the ga...

Страница 182: ...ave no roughness and for the suction side half to be lustrous Also it is satisfactory if strong contact marks can be seen on the side surface on the suction side and minute contact marks can be seen o...

Страница 183: ...it is abnormal replace it Test Operation The best method for testing the pump s operation is to mount it in a test stand However if that cannot be done test it under the conditions it would be sub je...

Страница 184: ...er 1 to the discharge side of the pump 2 There should be no mistakes made in the tester s pipe installation 2 Open the tester s loading valve and start the en gine 3 Run the engine at the rated speed...

Страница 185: ...e are out of center with respect to each other There are bubbles in the hydraulic oil Remove the dirt or eliminate the crushed condition of the hose Tighten all the joint Replace the hydraulic oil wit...

Страница 186: ...rive gear 1 and a driven gear 2 engaged with each other By turning the drive shaft 3 the space between the case and the gears is lled with oil This oil is thus sent through the pump from the inlet to...

Страница 187: ...r etc to remove any burrs sharp edges etc Do not turn adjusting screws if not required Apply hydraulic oil to sliding surfaces and apply a thin coating of grease to seals when assembling them Followin...

Страница 188: ...not to scratch or otherwise damage the ange When reassembling install the oil seal using the jigs A and B 5 Remove the rear cover 6 6 Remove the seal 2 and the backup ring 3 from the cover 6 7 Remove...

Страница 189: ...IV 43 HYDRAULIC UNITS GEAR PUMP INSPECTION AND ADJUSTMENT IV 36 38 TROUBLESHOOTING IV 39...

Страница 190: ...ing 3 Port Relief Valve 4 O ring 5 Nut 6 Main Relief Valve 7 O ring 8 O ring 9 Inlet Housing 10 Lift Arm Section Assembly 11 Bucket Section Assembly 12 Auxiliary Section Assembly CONTROL VALVE CONSTRU...

Страница 191: ...1 7 2 T7D203E Lift Arm Section Bucket Section Auxiliary Section 1 Load Check Valve 2 Spring 3 Cover 4 Screw 5 Spring Holder 6 Spring 7 Cap Screw 8 O ring 9 O ring 10 O ring 1 Load Check Valve 2 Sprin...

Страница 192: ...ket T7D204 9 7 2 10 6 1 11 4 3 14 15 5 12 13 8 T7D205 10 9 2 7 6 1 8 4 3 5 17 15 11 14 16 12 13 9 Lock Nut 10 Spring 11 Spring 12 O ring 13 O ring 14 O ring 15 O ring 1 Housing 2 Plug 3 Poppet 4 Main...

Страница 193: ...ctuator On the other hand the oil returned from the actuator ows into port A and runs through the inner passage of the spool 2 to be supplied to the next section When the spool 2 is moved to the left...

Страница 194: ...ther hand forces F and F1 are acting in the respective ar row directions on both sides of the main poppet 2 F P A Fl P A1 P Pressure A A1 Cross Sectional Area Since the cross sectional area of A is le...

Страница 195: ...he circuit becomes higher than the force of the spring 7 the needle valve 5 is pushed to the right by hydraulic pressure opening Oil then ows around the circumference of the needle valve 5 and passes...

Страница 196: ...ace the section assem bly as a unit Be sure to number each section and spool to avoid mistakes during assembly Following is an explanation of the control valve dis assembly procedure Follow the proced...

Страница 197: ...Operated Section 1 Take out the cap screw 5 and remove the cover 15 then remove the O ring 16 from the cover 15 Cap screw 3 92 0 98 N m 2 Remove the spool from the section 3 Take out the screw 17 and...

Страница 198: ...e 49 04 4 90 N m 2 Remove the O rings from sleeve 1 3 Remove the plug 2 Plug 42 17 3 92 N m 4 Remove the spring 3 and main poppet 4 5 Remove the Lock nut 5 Lock nut 23 54 1 96 N m 6 Remove the gasket...

Страница 199: ...rs the spool Scratches rust corrosion of the port seal portion which is in contact with the O ring Scratches rust corrosion of the seal portion of the relief valve etc Other damage which could be a hi...

Страница 200: ...rained due to strain in the installation face Valve was used at a pressure or a ow volume which was out of speci cation Bolts used to assemble the valve were tightened excessively Oil is accumulating...

Страница 201: ...cavitation valve seat and oil is bypassing Or a seat is damaged Spool stroke is not the speci ed stroke Pump is damaged and no oil is dis charged Disassemble and check then overhaul or replace Try ti...

Страница 202: ...g 5 Solenoid 6 Plug 7 O ring 8 O ring 9 O ring 10 O ring CONTROL VALVE HIGH FLOW CONSTRUCTION 11 Plug 12 Plunger 13 Relief Valve 14 O ring 15 O ring 16 Plug 17 Cover 18 Spool End 19 Holder 20 Spring 2...

Страница 203: ...ill combine the hydraulic oil ows from the pump P3 and the pump PTO together Also the unload valve 6 of the control valve high ow 1 keeps the pressure from the pump PTO constant When the solenoid 2 is...

Страница 204: ...1 is moved to the right by the spring force and pressed against the seat F1 force to the right direction A1 P spring force F2 force to the left direction A2 P Therefore F1 F2 is established and this m...

Страница 205: ...ly as a unit Be sure to number each section and spool to avoid mistakes during assembly Following is an explanation of the control valve dis assembly procedure Follow the procedure used to disassemble...

Страница 206: ...om the solenoid valve Cap Screw 3 92 0 98 N m 7 Remove the spool 4 the sleeve 5 and the spring 6 from the body To remove the sleeve turn the body upside down and lightly tap it 8 Remove the cap screw...

Страница 207: ...IV 61 HYDRAULIC UNITS CONTROL VALVE HIGH FLOW 10 Remove the screw 6 and remove the spring holder 7 spring 8 and spring holder 7 Screw 23 5 1 96 N m Apply Locktite 242 to the screw...

Страница 208: ...9 MPa 4 In order to keep the setting screw from turning after pressure has been adjusted tighten the locknut while at the same time holding the set ting screw rmly in place 5 Operate the relief valve...

Страница 209: ...e cannot be unloaded The solenoid coil is switched on A foreign matter which entered the spool of the solenoid switching section is blocking the switching the spool does not return A foreign matter wh...

Страница 210: ...X 30 2 12 12 11 11 20 27 4 29 21 22 1 23 3 31 17 3 18 16 30 2 19 5 25 26 6 24 7 28 10 9 15 14 13 8 14 SECTION X X SECTION Y Y SECTION Z Z 9 Spring 10 Plug 11 Cap Screw 12 Cap Screw 13 O ring 14 O ring...

Страница 211: ...ppet 6 The hydraulic oil from the port 2 pushes up the plunger 7 ows into the circuit of the port 1 and enters together with the oil from the port 1 into port T When the solenoid A is electri ed A mag...

Страница 212: ...ng the pressure in the port 1 at the set pressure The hydraulic oil in the port 2 pushes up the poppet 5 and ows into the port 3 When the solenoid B is not electri ed The hydraulic oil from the port P...

Страница 213: ...ting of hydraulic oil to sliding surfaces and a thin coating of grease to seals when assembling them Replace seals with new parts each time disassem bly is done The following describes the disassembly...

Страница 214: ...e 4 from the body To remove the sleeve turn the body upside down and lightly tap it Control Valve 1 Loosen the plug 5 from the body Plug 98 1 9 81 N m 2 Remove the O ring from the plug 5 3 Remove the...

Страница 215: ...13 from the body 7 Remove the piston 14 from the spool 13 Check Valve 1 Loosen the plug 15 from the body Plug 49 0 4 9 N m 2 Remove the O ring from the plug 15 3 Remove the spring 16 4 Remove the popp...

Страница 216: ...sion deformation breakage or other notable damage Replace O Ring Replace TROUBLESHOOTING Symptom Probable Causes Remedy Solenoid valve does not operate Wiring short circuit or wire break Solenoid coil...

Страница 217: ...9 Spool PILOT VALVE CONSTRUCTION 23 26 24 25 12 8 16 17 21 20 9 19 1 4 2 3 5 13 11 14 15 18 22 10 7 6 T7D300 10 Spool 11 Plug 12 Push Rod 13 Push Rod 14 Seal 15 O ring 16 Washer 1 S N 21500004 215034...

Страница 218: ...smitted to the spool Therefore the spool is pushed up by the return spring and is in the output port C position shown above with oil not owing between port P and the output port C but owing between th...

Страница 219: ...from each part and check them to make sure there are no burrs bruises using or other marks on them Remove all burrs and bruises using an oil stone Apply thin coating of grease to seals when assem bli...

Страница 220: ...e the O ring 7 and seal 8 from the plug 5 Remove the reducing valve 12 and spring 13 Make match marks on the reducing valve and casing hole so they can be placed in the same position when they are rea...

Страница 221: ...IV 75 HYDRAULIC UNITS PILOT VALVE b Remove the spring seat 14 spring 15 and washer 2 16 from the spool 17 7 Take out the cap screws 8 Remove the port plate 18 O ring 19 and bushing 20 from the casing...

Страница 222: ...g hole 2 Install the seal washer and cap screws Cap screw 20 6 1 5 N m 3 Assemble the reducing valve 12 a Install the washer 2 16 spring 15 and spring seat 14 on the spool 17 b Push in the spring seat...

Страница 223: ...l them in the positions they were in be fore disassembly 5 Install the O ring 7 and seal 8 in the plug 5 6 Install the push rod 9 in the plug 5 Apply hydraulic oil to the push rod 7 Install the plug 5...

Страница 224: ...sc 2 the adjust nut 1 and the lock nut Tighten the adjust nut to the point where all 4 push rods are uniformly making contact During tightening the disc should not be moved Adjust Nut 68 6 4 9 N m Loc...

Страница 225: ...Scratches in the sliding portion Replace Replace Plug Seal is imperfect due to damage Repair or replace Operating Portion Tightening is loose at the pin shaft or joint of the oper ating portion with l...

Страница 226: ...ressure Replace the spring Replace the spool and casing assembly Disassemble and reassemble or replace the handle Secondary pressure doesn t stabilize Sliding parts are catching Tank line pressure uct...

Страница 227: ...LVE 1 Casing 2 Cover 3 Plug 4 Seal 5 O ring 6 Push Rod 7 Shim 8 Spool PILOT VALVE AUXILIARY CONSTRUCTION L3D350 16 6 4 3 2 5 9 12 11 7 10 8 1 13 15 14 9 Spring Seat 10 Washer 11 Spring 12 Spring 13 Sh...

Страница 228: ...bly refer to the construction diagram and follow the disassembly procedure in the reverse or der Disassembly 1 Remove the boot from the cover Use a copper or iron sheet to fasten the valve to the vice...

Страница 229: ...nately so that the cover is at Mark the cover and casing so that they can be reassembled in the same positions Cap screw 8 8 N m 5 Remove the push rods 4 together with the plug 5 6 Remove the O rings...

Страница 230: ...IV 84 HYDRAULIC UNITS PILOT VALVE INSPECTION AND ADJUSTMENT IV 79 TROUBLESHOOTING IV 80...

Страница 231: ...ring 7 O ring 8 O ring 9 O ring SELF LEVEL VALVE CONSTRUCTION T7D950E 4 5 6 7 2 16 17 24 23 21 22 20 12 13 14 19 25 10 11 9 3 15 8 18 SECTION A A 10 Spring 11 Plunger 12 Pin 13 Cap 14 Nut 15 Set Screw...

Страница 232: ...e point where it exceeds the force exerted by spring 6 the oil which has been ejected from the rod side of bucket cylinder 4 ows out of port B coming out of port C and passing along the surface of unl...

Страница 233: ...unger 9 and instead all oil from the pump ows into the head side of bucket cylinder 4 The oil owing out from the rod side returns to the tank At Bucket Tilt Rear Bucket Spool In Arm Spool Neutral The...

Страница 234: ...f hydraulic oil to sliding surfaces and a thin coating of grease to seals when assembling them Replace seals with new parts each time disassem bly is done Following is an explanation of the self level...

Страница 235: ...16 from cap Make a record of the measurements for A see diagram below and make sure that these measurements do not change during assem bly Nut 5 4 7 8 N m 5 Remove cap 15 and then take O ring 14 off...

Страница 236: ...th the spool Scratches rust or corrosion of the seal part in contact with the O ring Other damage considered to impair the normal func tions Replace Replace Replace Spool Pin Plunger Damage on the out...

Страница 237: ...much self level Pin is out of adjustment Flow divider spool is stuck towards port B Flow divider spool installed wrong Re adjust pin to achieve proper ow split Remove ow divider spool and inspect for...

Страница 238: ...ner 17 Cushion Seal 18 Spacer 19 Stopper 20 Piston 21 Wear Ring 22 Ball 23 Set Screw 24 Cushion Bearing 25 Cushion Bearing 26 Washer 27 Screw 28 Dust Seal 29 Grease Nipple 30 Grease Nipple Bucket Cyli...

Страница 239: ...colliding with the cover at the stroke end acts on that mechanism and is dampened by it Cushion Mechanism Before the piston 1 nears the stroke end and col lides with the cover 2 the cushion bearing 3...

Страница 240: ...rts Apply a thin coating of hydraulic oil to seals be fore tting them in place After tting make sure the O rings are not twist ed Apply clean hydraulic oil to each sliding portion before assembling th...

Страница 241: ...e Pull it out straight to prevent the sliding sur face from being scratched Piston Rod Assembly 1 Fasten the piston rod assembly securely in a level position 2 Remove the piston a Take out the set scr...

Страница 242: ...the O ring 14 and backup ring 15 2 Remove the stopper 16 spacer 17 and cush ion seal 18 Piston 1 Remove the wear ring 27 then remove the piston packing 28 Spread the wear ring at the cut portion the m...

Страница 243: ...g 35 2 Remove the rod packing a Remove the stopper 37 b Remove the spacer 38 c Remove the cushion seal 39 d Remove the rod packing 40 e Remove the backup ring 41 3 Remove the dust seal 42 Tap alternat...

Страница 244: ...n the rod cover it is impossible to take it out First use a lathe to grind down the inside portion until only a thin piece remains then insert a copper spatula strongly and pry it out to remove it Cle...

Страница 245: ...d and tube 2 Using a setting tool 45 install the dust seals Rod Cover 1 Using an installation jig A pressure t the bushing Hydraulic uid should be applied to the inside surface of the rod cover before...

Страница 246: ...er 38 e Install the stopper 37 3 Install the dust seal 42 In the case of a dust seal with a metal ring around the outer circumference use a setting tool 46 to install it 4 Install the backup ring 35 a...

Страница 247: ...ston 1 Assemble the piston assembly a Fit the O ring 50 If the O ring is twisted after it is tted cor rect it b Cover the piston with the sliding jig C then using the tting jig D insert the slipper ri...

Страница 248: ...ssembly 7 and rod cover 6 t the divided connector 9 around both sides then fasten it with the stopper 8 b Assemble the retainer assembly 7 with ref erence to the item IV 87 88 2 Insert the rod cover a...

Страница 249: ...in a horizontal position then insert the piston rod assembly in the tube During insertion align the center of the piston rod with the center of the tube insert ing it straight so that the seals will n...

Страница 250: ...squeaking sound in the operation test after reas sembly or if it catches during movement If the inner diameter of the clevis bushing is worn replace the bushing Tube If there are cracks in the welded...

Страница 251: ...1 Disconnect the extension side hose 2 Apply test pressure to the retraction side for 3 minutes 3 Measure the amount of oil that has leaked from the extension side The amount of leakage should be 1 c...

Страница 252: ...nd other seals If it leaks after the seals have been replaced replace the piston rod Repair the hardened chrome plat ing Oil leaks from the outer circum ference of the rod cover O ring is damaged Back...

Страница 253: ...Jig B A B C D E F A B C D E F Arm 49 0 45 0 28 0 22 0 15 0 60 0 54 0 45 0 40 0 5 0 15 0 65 0 Bucket 43 0 40 0 28 0 34 0 15 0 55 0 54 0 45 0 40 0 5 0 15 0 65 0 Sliding Jig C MATERIAL STKM13C Fitting Ji...

Страница 254: ...IV 108 HYDRAULIC UNITS CYLINDERS Corrective Jig E MATERIAL STKM13C Unit mm Corrective Jig E A B Arm 90 75 Bucket 90 75...

Страница 255: ...raulic motor 1 2 1 Flange Holder 2 Pin 3 Bearing Assembly 4 Snap Ring 5 Oil Seal 7 Shaft 8 O ring 9 O ring 10 Cylinder Block Assembly 25 Plug 26 O ring 28 Spring 29 Center Disc 30 Friction Disc 31 Bra...

Страница 256: ...ic motor 2 2 6 Bearing 11 Valve Plate 12 Pin 13 Valve Body 14 Cap Screw 15 Cap Screw 18 Plug 19 Plug 20 Plug 21 Plug 27 Plug 32 Pin 40 Plug 41 Ball 42 Spool 43 Spring 44 Plug 45 Spool 46 Spring Guide...

Страница 257: ...s 1 Housing 2 Cover 3 Carrier 4 Sun Gear 5 Sun Gear 6 Planet Gear 7 Planet Gear 8 Ring Nut 9 Thrust Plate 10 Thrust Plate 11 Snap Ring 13 Bearing 14 Needle Bearing 16 Needle Bearing 18 Floating Seal 1...

Страница 258: ...and via the spline the torque is transmit ted to the shaft 4 turning it Conversely if high pressure oil is introduced to the port C the rotation is the reverse of the above 2 Speed mechanism 1st spee...

Страница 259: ...l to prevent the oil temperature from increasing and to remove contaminants from the circuit When the machine is stopped no pressure is gener ated in the motor port and thus the plunger 1 is held at t...

Страница 260: ...ple gear mesh points The motor drives the 1st stage sun gear 1 which in turn drives the 1st planet gears 2 Since these planet gears 2 are engaged with the ring gear 3 the rota tion is transmitted to t...

Страница 261: ...IV 115 HYDRAULIC UNITS TRAVEL MOTOR DISASSEMBLY AND ASSEMBLY Special tools...

Страница 262: ...AVEL MOTOR 4MAA05Z Cap Screw M6x2 Inbusschraube M6x2 Vis M6x2 3 x2 2 x1 4 x1 1 x1 25 5 40 22 4 190 70 18 27 8 25 5 40 5 30 20 35 42 3 5 5 20 20 70 9 45 60 12x2 25 70 25 260 M16 56 3 20 40 25 5 25 4 JI...

Страница 263: ...IV 117 HYDRAULIC UNITS TRAVEL MOTOR...

Страница 264: ...ram as necessary Disassembly Reduction gears 1 Take out the plugs 24 and drain out the gear oil 2 Take out the bolts and remove the cover 2 If it is hard to remove lightly tap on the side of the cover...

Страница 265: ...ews and remove the thrust plate 10 6 Remove the planet gears 7 Remove the planet gears 7 together with the needle bearing 16 mounted within Hydraulic motor 1 Remove the relief valve 50 2 Take out the...

Страница 266: ...lder 1 The block must be thin enough so that the cap screw M10 100 can be tightened to the brake piston 31 in the next step Be sure that the valve body is horizontal 5 Take out the plugs and tighten t...

Страница 267: ...ve the shaft 7 and the swash plate 37 9 Remove the balls 39 and the control piston 38 Floating Seal 1 Remove the inner race 16 Use the jig A to hook the inner race and then use the jig B to hold the j...

Страница 268: ...NITS TRAVEL MOTOR 4MAA20Z 4MAA21Z 2 Remove the plugs 23 3 Remove the ring nut 8 Use the jig C 4 Remove the housing 1 from the ange holder Use the jig D 5 Remove the oating seal 18 from the housing 1 o...

Страница 269: ...it the oating seal 18 by pressing the guide jig E with the jig F Apply gear oil on the sliding surface Important Be sure not to damage the sliding surface The oating seal must be mounted horizon tally...

Страница 270: ...ing surface Do not apply grease Important Be sure not to damage the sliding surface The oating seal must be mounted horizon tally 7 Install the housing 1 on the ange holder 8 Fit the ring nut 8 Use th...

Страница 271: ...ner races After assembly the dimension X must be between 0 and 1 mm Hydraulic motor 1 Install the oil seal 5 Press t the seal with its metal edge posi tioned upside Grease the lip part of the oil sea...

Страница 272: ...he swash plate 5 Install the cylinder block assembly 10 Use the spline of the shaft as a guide 6 Install the center discs 29 and the friction discs 30 alternately The friction discs must be engaged wi...

Страница 273: ...l the O rings 8 9 and 35 and the pins 2 on the ange holder 11 Install the pin 12 on the valve body 13 12 Install the valve plate 11 on the valve body 13 Grease the backside of the valve plate The pins...

Страница 274: ...R 16 Install the ball 41 and the plug 40 Degrease the hole before installing the plug 40 Plug 30 N m 17 Install the plug 22 Plug 35 N m 18 Install the plug 22 spool 42 and the springs 43 Plug 35 N m 1...

Страница 275: ...R 20 Mount the spring guide 46 and the spring 49 to the spool 45 and then install it Be sure to mount the spring guide 46 in the correct direction 21 Install the plugs 47 Plug 35 N m 22 Install the re...

Страница 276: ...7 Clean the inner surface of the gears and lightly apply oil on them Do not tap on the bearing or gear 2 Install the thrust plate 10 and t the screws Screw 20 N m 3 Install the sun gear 5 4 Install t...

Страница 277: ...on the housing 1 6 Install the sun gear 4 7 Measure the depth A from the housing end face to the holder pin 8 Measure the dimension B of the cover 9 The thrust plate must be such that its thickness X...

Страница 278: ...he bolts Apply either Loctite 515 or ThreeBond 1215 to the cover surface on which the housing is mounted Bolt 16 N m 12 Add the gear oil through the plug hole and at tach the plug 24 Be sure to wrap s...

Страница 279: ...ace of the sliding part with the piston assembly No abnormal scratches wear or sei zure on the surface Repair with a lap ping tool 1000 or replace Cylinder block Surface of the sliding part with the v...

Страница 280: ...because the motor s sliding part is worn out Bearing is worn out Replace the abnormally worn part if any Replace the abnormally worn part if any Oil leak Oil leak due to breakage of oil seal and O rin...

Страница 281: ...ally released the piston motor loses its mechanical braking ca pability The mechanical braking capability of the vehicle must be maintained by means of a vehicle brake or for stationary equipment must...

Страница 282: ...IV 136 HYDRAULIC UNITS TRAVEL MOTOR...

Страница 283: ...V 1 V TROUBLESHOOTING...

Страница 284: ...ether the machine has broken down may differ between individu als IMPORTANT When running the machine it is possible that moving the machine could make the breakdown worse than it already is so do not...

Страница 285: ...erature 14 Machine will not travel in second speed 16 LIFT ARMS Lift arm cylinders fail to move 18 Movement of the lift arm cylinders is slow or lacks power 20 Slowly pulling the control lever of the...

Страница 286: ...r or replace hydraulic pump Replace the coupling mechanism Repair or replace hydraulic pump Replace fuse Replace proximity switch Normal Normal Normal Faulty Faulty Faulty Not enough oil Normal Faulty...

Страница 287: ...ndards for Judging Performance Check pumps P3 and P4 gear pumps a Remove the delivery hoses 2 from the pump b Crank the engine If everything is working properly hydrau lic oil will be ejected from the...

Страница 288: ...lock solenoid Check the solenoid according to the following procedure a Turn the starter switch to the on position b Lightly press down on the protruding part on the end of the solenoid c Move the sa...

Страница 289: ...ect the hydraulic oil level 1 Replace seal tape O ring hose Take proper action in accor dance with the cause of the problem Replace the lter element Repair or replace the control valve sub Normal No N...

Страница 290: ...strainer is clogged 3 Inspect the line lter Remove the case take out the lter element and check to see if the lter is clogged 4 Inspect the control valve sub V 6 5 Hydraulic pump at fault When the ins...

Страница 291: ...essure is too low adjust it by tightening the valve set screw gradu ally If the pressure does not rise even after the screw has been turned onequarter of a full rotation the relief valve may be judged...

Страница 292: ...mal Normal Pressure low Inspect the output pres sure of the HST pump 3 Repair or replace HST pump Repair or replace travel mo tor Travel motor fault Repair or replace pilot valve Faulty Perform replac...

Страница 293: ...pect the charge pressure II Speci cations Standards for Judging Performance 3 Inspect the output pressure of the HST pump II Speci cations Standards for Judging Performance 4 Perform replacement test...

Страница 294: ...curve within standard 1 Normal Adjust to speci ed tension or remove foreign matter Repair or replace pilot valve Repair or replace high pres sure relief valve Repair or replace HST pump Problem due to...

Страница 295: ...Speci cations Standards for Judging Performance 2 Inspect the crawler tension and inspect for foreign matter biting in etc II Speci cations Standards for Judging Performance 3 Inspect the pilot valve...

Страница 296: ...or the parking brake 4 Inspect high pressure relief valves 3 Inspect oil cooler 2 Inspect hydraulic oil level 1 Add hydraulic oil Clean the oil cooler and radiator Repair or replace the oil cooler Rep...

Страница 297: ...worked their way in and clogged the cooling system 3 Inspect the high pressure relief valves V 11 4 Inspect the release pressure for the parking brake a Disconnect the hose running from the control v...

Страница 298: ...ard value the valve is normal II Speci cations Standards for Judging Performance MACHINE WILL NOT TRAVEL IN SECOND SPEED The 2nd speed control valve is faulty 5 Inspect the 2nd speed solenoid valve 4...

Страница 299: ...start switch ON b Press the protruding portion of the solenoid valve lightly c Turn the travel speed switch ON d If the spool moves and vibration can be felt with the ngertip when the circuit changes...

Страница 300: ...ef valve Repair or replace pilot valve Normal Faulty 1 Inspect the operation of actuators other than the lift arm cylinders Check the table at right to see if the problem lies with the lift arms alone...

Страница 301: ...or the lift arms may be judged to be at fault 5 Inspect the arm oat solenoid valve Foreign particles working their way onto the surface of the valve sheet or the locking of the poppet in a xed positio...

Страница 302: ...port relief valves 4 Repair or replace arm oat solenoid valve Repair or replace lift arm cylinder Normal Faulty Repair or replace port relief valve No change Operation be came normal Port relief valve...

Страница 303: ...ot being checked and insert a plug in place of the removed hose c Disconnect the hose to the rod end from the cylinder to be checked and release the oil in the pipes within Be sure to insert a plug in...

Страница 304: ...to contact with the ground before beginning the above procedure Reference The quantity of oil and its pressure is low when the spool begins operation This places a heavy load on the lift arm cylinders...

Страница 305: ...lief valves 4 Replace control valve Repair or replace port relief valve No change Operation be came normal Problem lies with port relief valve Repair or replace lift arm cylinder Outside the standard...

Страница 306: ...1 Inspect operation of actuators other than the bucket cylinders Check the table at right to see if the problem lies with the bucket cylinders alone If the problem does lie with the bucket cylinders t...

Страница 307: ...e port relief valve for the lift arms with a working one and see if the bucket cylin ders then operates properly If they do the port relief valve for the bucket may be judged to be at fault 5 Inspect...

Страница 308: ...l Faulty Perform replacement test for the port relief valves 4 Repair or replace port relief valve Operation be came normal Problem lies with port relief valve Repair or replace pilot valve Outside th...

Страница 309: ...ct with the ground b Check the left and right bucket cylinders individually Disconnect the hose from the cylinder not being checked and insert a plug in place of the removed hose c Disconnect two hose...

Страница 310: ...air or replace valve Normal Repair or replace bucket cylinder Outside the standard Faulty 1 Is the amount of natural fall within the stan dard II Speci cations Standards for Judging Performance 2 Insp...

Страница 311: ...spect the ow selector switch Set the safety bar to the driving position and turn the proximity switch and the starter switch to the ON position Push the ow selector switch to ON If the green lamp ligh...

Страница 312: ...r solenoid a Turn the proximity switch and start switch ON b Press the protruding portion of the solenoid valve lightly c Turn the ow selector switch ON d If the spool moves and vibration can be felt...

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