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STEERING SYSTEM

DK35SE/DK40SE/DK45SE/DK50SE

TaBLe OF COnTenTS

1. SpeCIFICaTIOnS ................................... 9-2

1.1 Steering cylinder ......................................8-

2

1.2 Steering unit .............................................8-

2

1.3 Tightening torque for main components ...8-

2

2. OpeRaTInG pRInCIpLe ........................ 9-3

2.1  Diagram for steering operation .................8-3
2.2  Operating principle ...................................8-5
2.3  Structure ...................................................8-9

3. TROUBLeSHOOTInG .......................... 9-12

. meaSURemenT anD aDjUSTmenT . 9-13

4.1  Steering relief opening pressure ............... 8-13
4.2  Relief pressure adjustment ....................8-13
4.3  Toe in ......................................................8-14

5. eXpLODeD VIeW ................................. 9-15

5.1  T595A steering cylinder ..........................8-15
5.2  T596A steering cover .............................8-16
5.3  T605A steering unit ................................8-17
5.4  T875A instrument panel cover ...............8-18
5.5  T845A-1 frame (HST) .............................8-19
5.6  T845A-2 frame (mechanical) ..................8-20

6. SeRVICInG ............................................ 9-21

6.1 Steering cylinder ....................................8-21
6.2 Removal of steering unit ........................8-2

2

6.3 Tightening torque of steering hose and

installation of steering unit

.....................8-23

6.4 Steering hose location ............................8-24
6.5 Disassembly of steering unit

components

............................................8-26

M32_EN_A4.indb 1

2007-02-02 오전 10:44:43

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Summary of Contents for DK35SE

Page 1: ...f opening pressure 8 13 4 2 Relief pressure adjustment 8 13 4 3 Toe in 8 14 5 Exploded view 9 15 5 1 T595A steering cylinder 8 15 5 2 T596A steering cover 8 16 5 3 T605A steering unit 8 17 5 4 T875A instrument panel cover 8 18 5 5 T845A 1 frame HST 8 19 5 6 T845A 2 frame mechanical 8 20 6 SERVICING 9 21 6 1 Steering cylinder 8 21 6 2 Removal of steering unit 8 22 6 3 Tightening torque of steering ...

Page 2: ...1 Steering cylinder 기계식 HST식 T46W901A Type Two cylinders with one rod single action ram cylinder Cylinder O D 35 HP 60 mm 2 3 in 40 50 HP 65 mm 2 5 in Cylinder I D 35 HP 55 mm 2 1 in 40 50 HP 60 mm 2 3 in Rod O D 35 HP 40 mm 1 5 in 40 50 HP 45 mm 1 7 in Cylinder stroke 198 5 mm 7 8 in Max steering angle 55 1 0 1 2 Steering unit Type Non load reaction type Steering output flow rate 35 HP 69 cc rev ...

Page 3: ...t 5 2 IN T 6 7 1 5 3 4 T46W902A Pressure Return Operating hydraulic pressure 1 Gear pump 2 Modulator valve 3 PTO clutch pack 4 4WD clutch 5 Steering unit 6 Steering return pip 7 Suction pipe Components The oil flows to the left or right steering cylinder depend ing on the rotated position of the steering wheel Then the other cylinder that is not supplied with oil is com pressed by the tie rod The ...

Page 4: ...at the oil is supplied to the steering unit is the same However the return line 1 supplies oil to the HST 4 through the HST oil cooler and the HST filter 3 for charging of the HST HST T46W903A 1 Oil cooler pipe 2 Oil cooler 3 HST filter 4 HST Components Pressure Return Operating hydraulic pressure STEERING SYSTEM OPERATING PRINCIPLE M32_EN_A4 indb 4 2007 02 02 오전 10 44 47 ...

Page 5: ...ressed by the outer force applied to the front wheel while driving the returned oil turns the gerotor of the steering unit which then turns the steering wheel Then the oil flows to the other cylinder T46W905A A 140kgf cm2 흡입 점검 밸브 Circuit diagram for non load reaction type DK 35 40 45 50 SE Circuit diagram for load reaction type CK and conventional DK series Therefore when releasing the steering w...

Page 6: ...the center position when releasing it after cornering Neutral T46W906A The steering should be forced to be turned in some oc casions for example when the engine does not start or the hydraulic pump is damaged When turning the steering wheel to the right direction the RH oil passage of the valve plate is open and the oil is supplied to the R port and the RH cylinder by the gerotor Then the drained ...

Page 7: ...e right cylinder is expanded the power is transferred to the tie rod 2 and the left cylinder is compressed Therefore the oil returned to the left cylinder is re turned to the T port through the L port and the valve plate T P R L T46W908A Operation of relief valve for right turn If the steering cylinder rod is completely drawn out and does not move the rod does not move due to the stop per even whe...

Page 8: ...UTCH TRANSMISSION HST REAR AXLE BRAKE FRONT AXLE HYDRAULIC ELECTRIC STEERING The operation for the left turn is same as that of right turn except for the oil flow direction Left turn T46W910A STEERING SYSTEM OPERATING PRINCIPLE M32_EN_A4 indb 8 2007 02 02 오전 10 44 51 ...

Page 9: ...l feeling of the steer ing wheel The outer force for cylinder rod compression is supplied by the tie rod since this is the single action type Type Tube O D C Tube I D B Rod O D A Stroke D 35HP φ 60 2 36 in φ 55 2 16 in φ 40 1 57 in 198 5 mm 7 81 in 40 50HP φ 65 2 56 in φ 60 2 36 in φ 45 1 77 in 198 5 mm 7 81 in Major specifications Structure T46W911A 1 Tube 2 Packing 3 Bush 4 Dust seal 5 Rod 6 Rin...

Page 10: ...eal 3 Retainer ring 4 Seal gland bushing 5 O ring 6 Oil seal 7 Lace bearing 8 Thrust needle bearing 9 Control valve assembly 9a Relief valve 10 Centering spring 11 Plain spring 12 Pin 13 O ring 14 Spacer 15 Drive shaft 16 Gerotor 17 Star seal assembly 18 Endcap 19 Bolt 20 Retainer bolt assembly 21 Ball 22 Spool 23 Sleeve Components STEERING SYSTEM OPERATING PRINCIPLE M32_EN_A4 indb 10 2007 02 02 오...

Page 11: ...pool and the sleeve are mechanically inter connected The springs 10 11 are installed through the spool 22 and sleeve 23 to maintain the connect ed state of the spool and the sleeve This position corresponds to the neutral state and is kept as long as the steering wheel is not turned The pin is fitted to the drive shaft 15 and the sleeve 23 there being some clearance between the pin and the holes o...

Page 12: ...Replace Replace Replace Fluid leakage Leakage in steering hose Leakage in steering unit Leakage in hose connection Damaged steering cylinder oil seal Replace hose Repair or replace Retighten and replace O ring Replace steering cylinder Vibration of steering wheel Abnormally worn tire lug abnormal size or deflection insufficient inflation pressure Damaged axle bearing and gear Repair and replace Re...

Page 13: ...4 2 Relief pressure Adjustment T46W915A Turn the plug A for setting relief valve 90 at one time and measure the steering relief pressure Turn the plug clockwise to increase the pressure When the right pressure is achieved lock the plug 1 2 3 Be careful of the turning direction of the steering since the oil spurts from the steering cylinder if the steering wheel is turned to the opposite direction ...

Page 14: ... the rear width 2 between the front wheels Measure this distance 2 3 times while turning the tires Get the average value of this distance Adjust the toe in so that the distance between the front is 2 8 mm 0 079 0 315 in shorter than the distance between the rear To adjust the toe in loosen the lock nuts 5 from both tie rod ends Turn the tie rod 3 to adjust the toe in and tighten the lock nuts 5 fi...

Page 15: ... latest information Notes 1 Steering cylinder assembly LH 35 HP 2 Steering cylinder assembly LH 40 50 HP 3 Steering cylinder assembly RH 35 HP 4 Steering cylinder assembly RH 40 50 HP 5 Bolt 6 Nut 7 Spacer 8 Cylinder support pin 9 Grease nipple 10 Bolt with captive washer 11 Support pin 12 Grease nipple 13 Threaded nut 14 Cotter pin 15 Tie rod assembly 16 Tie rod 17 Tie rod end assembly LH 18 Tie ...

Page 16: ...INE CLUTCH TRANSMISSION HST REAR AXLE BRAKE FRONT AXLE HYDRAULIC ELECTRIC STEERING 5 2 T596A Steering cover T46W918A 1 Cylinder cover LH 2 Cylinder cover RH 3 Bolt with captive washer Components STEERING SYSTEM SYSTEM LAYOUT M32_EN_A4 indb 16 2007 02 02 오전 10 44 57 ...

Page 17: ...605A Steering unit T46W919A 1 Power steering unit 2 Hydraulic block 3 O ring 4 Socket bolt 5 Connecter 6 Connecter 7 Elbow 8 Steering hose assembly P 9 Steering hose assembly T 10 Steering hose assembly LH 11 Steering hose assembly RH 12 Elbow 13 Tube band Components Mechanical HST STEERING SYSTEM SYSTEM LAYOUT M32_EN_A4 indb 17 2007 02 02 오전 10 44 58 ...

Page 18: ... Instrument panel cover T46W920A 1 Instrument cover T 2 Bolt with captive washer 3 Cover P 4 Bolt with captive washer 5 Steering wheel cover FRT 6 Steering wheel cover RR 7 Spring nut 8 Screw 9 Steering wheel assembly 10 Spring washer 11 Nut 12 Steering wheel cap 13 Bellows Components STEERING SYSTEM SYSTEM LAYOUT M32_EN_A4 indb 18 2007 02 02 오전 10 45 00 ...

Page 19: ...ly 17 Steering support 18 Shaft 19 Snap ring 20 Ball bearing 21 Snap ring 22 Steering shaft assembly 23 Spring pin 24 Snap ring 25 Cushion rubber 2 26 Column 27 Cushion rubber 28 Bolt with captive washer 29 Collar tilt 30 Bolt with captive washer 31 Sector gear 32 Bolt with captive washer 33 Lock gear 34 Lever tilt 35 Fixing plate tilt 36 Bolt with captive washer 37 Rod tilt 38 Plain washer 39 Sna...

Page 20: ...sembly 17 Steering support 18 Shaft 19 Snap ring 20 Ball bearing 21 Snap ring 22 Steering shaft assembly 23 Spring pin 24 Snap ring 25 Cushion rubber 2 26 Column 27 Cushion rubber 28 Bolt with captive washer 29 Collar tilt 30 Bolt with captive washer 31 Sector gear 32 Bolt with captive washer 33 Lock gear 34 Lever tilt 35 Fixing plate tilt 36 Bolt with captive washer 37 Rod tilt 38 Plain washer 39...

Page 21: ...eakage 3 4 T46w925A Tightening torque for pin mounting bolt in the steer ing cylinder Tightening torque for pin mounting bolt in steering cylinder M8 23 5 27 5 Nm 2 4 2 8 kgf m 17 4 20 3 lb ft Installation of pin mounting nut on the steering cyl inder Tighten the nut slightly using a proper tool Tighten the nut until the tightening torque is sharply increased and tighten it further until the next ...

Page 22: ...ring unit T46w926A Remove the upper cover 1 lower cover 3 front handle cover 2 and rear handle cover 4 1 Disconnect the steering hoses 1 from the steering unit 2 2 7 7 T46w928A 1 2 1 1 T46w927A Remove the steering support 5 from the frame Separate the steering unit 6 from the steering support 5 3 4 STEERING SYSTEM SERVICING M32_EN_A4 indb 22 2007 02 02 오전 10 45 14 ...

Page 23: ...nuts 8 9 for hydraulic hoses RH LH 24 5 Nm 2 5 kgf m 18 lb ft Socket head bolt 10 and bolt 11 44 1 Nm 4 5 kgf m 32 5 lb ft Hydraulic hoses P 12 13 49 Nm 5 kgf m 36 1 lb ft 1 2 3 4 Clamp 15 tightening torque of return hose 14 for mechanical type 4 9 Nm 0 5 kgf m 3 6 lb ft Apply grease in the cushion rubber 16 when in stalling it When installing the steering shaft 17 to the steer ing unit apply suff...

Page 24: ...e supply hose installed be tween modulator valve and steering unit It is indicated by green tape on both ends T46w954A T46w953A P Pump This is the return hose installed between steering unit and hydraulic block on the gear pump For HST tractor this hose is connected from steering unit to HST passed through oil cooler T46w955A T Return STEERING SYSTEM SERVICING M32_EN_A4 indb 24 2007 02 02 오전 10 45...

Page 25: ... 50SE This hose is installed between steering unit and RH steering cylinder It is indicated by white tape on both ends T46w956A R Right turn This hose is installed between steering unit and LH steering cylinder It is indicated by yellow tape on both ends T46w957A L Left turn STEERING SYSTEM SERVICING M32_EN_A4 indb 25 2007 02 02 오전 10 45 24 ...

Page 26: ...rotor 4 and cap 3 Remove the steering motor from the vise and re move the check valve ball 1 from the housing 5 1 Connector 3 End cap 2 Control motor 1 Sealing 2 Stator 3 Drive shaft 4 Rotor 5 Spacer 1 Check valve ball 2 The deepest bolt hole Lift the drive shaft 3 and spacer 5 from the hous ing Remove the O ring under the spacer 4 Using a screwdriver remove the retaining ring 2 from the top of th...

Page 27: ...ng motor housing and should be rotated slightly during removal Install the sleeve and spool while turning them in the housing supported by pin At this time keep them horizontal as much as possible This helps prevent the pin from sliding out of its hole and catching in the housing Pull the sleeve out as straight as pos sible to prevent it from becoming jammed 9 1 Sleeve 3 Pin 2 Spool Remove the pin...

Page 28: ...r distortion Center ing springs without tension should be replaced 1 2 3 4 5 6 7 Installation Slide the spool into the sleeve Position the spool so that the centering spring slots on the spool and sleeve are aligned in order for the centering springs to be installed 1 T46W939A 1 Special tool 2 Centering spring With the centering spring slots aligned insert the special tool 1 in the slots Assemble ...

Page 29: ...e that the opposite thrust bearing race 1 is seated on the sleeve and spool T46W941A T46W942A Install a new O ring dust seal and oil seal in the gland bushing and then insert the bushing into the housing while rotating it Install the retaining ring in the housing groove 8 9 T46W943A 1 Check valve ball 2 Retainer bolt hole Grip the bottom end of steering motor housing with a vise To avoid damaging ...

Page 30: ...48A T46W947A Insert the drive shaft 1 into the motor so that its slotted end engages with the pin in the spool and sleeve Mark a line 2 places on the face of the drive shaft so that the pin is parallel with the port face of the steering motor housing 3 Coat a new O ring 2 and seal ring 3 with clean hydraulic fluid and install them on the rotor 1 Install a new O ring 4 in the groove of the stator a...

Page 31: ...46W951A 1 Line 2 Pin 3 Port face 17 When installing the steering motor the following should be aligned for correct installation a The port face 3 of the steering motor housing b The pin 2 through the spool and sleeve c The line drawn on the drive shaft d The middle of the two grooves in the rotor If any of these components are not aligned the steering motor will not operate properly T46W950A 1 End...

Page 32: ...MEMO M32_EN_A4 indb 32 2007 02 02 오전 10 45 34 ...

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