U20-3, U25-3 WSM
Hydraulic system (Service section)
IV
-S-52
7. Mounting the hex socket lock screw
Secure the hex socket lock screw (60) and the
hex nut (61) to achieve the same length as
before disassembly.
(Wrench “13”, hex wrench “4”)
8. Mounting the gear pump
Assemble the collar (67), coupling (66) and
O-rings (71) and (72) to the gear pump joint of
the piston pump kit, and mount the gear pump
with the two M8x20 hex bolts (68) and the
polished washer (70).
(Closed wrench “13”)
Tightening torque: 1.0 ~ 1.4 kgf·m
9. Checking after assembly
The above completes the reassembly work.
Turn the shaft and check to see if it turns
smoothly.
[5]Troubleshooting of pump
Trouble
Cause
Remedy
1. Engine is overloaded.
(1) Engine rpm higher than
specified.
(2) Pressure higher than
specified.
(3) Pump internal parts seized or
broken.
(1) Readjust as specified.
(2) Readjust as specified.
(3) Repair or replace the pump.
2. Pump oil amount drops
extremely. Discharge
pressure does not rise.
(1) Engine rpm drop.
(2) Pump mounting coupling
defective.
(3) Pump internal parts seized or
broken.
(1) Readjust the rpm.
(2) Repair or replace the pump
coupling.
(3) Repair or replace the pump.
3. Unusual noise or vibrations
(Cavitation)
(1) Air or water mixed in hydraulic
oil.
(2) Suction strainer clogged.
(3) Suction pipe clogged or
choked.
(4) Attached pump in trouble (if it
is attached.)
(5) Caulking of piston shoe
broken.
(6) Pump mount loose.
(7) Coupling defective.
(1) Repair the circuit. Retighten
the suction pipe in particular.
Replace if mixed with water.
(2) Wash or replace the suction
strainer.
(3) Repair the suction pipe.
(4) Repair or replace the attached
pump.
(5) Replace the piston assembly.
(6) Mount the pump firmly.
(7) Replace the coupling.
4. Oil leak
(1) O-ring or seat packing
defective.
(2) Cap ring in poor contact.
(3) Oil leak from oil seal edge.
(1) Replace the O-ring or seat
packing. (Fit it correctly.)
(2) Retighten to the specified
torque.
(3) Replace or repair the oil seal
and shaft.
Содержание U20-3
Страница 1: ...WORKSHOP MANUAL KUBOTA EXCAVATOR U20 3 Code No 97899 60740 U25 3 ...
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Страница 47: ...U20 3 U25 3 WSM Machine body Mechanism section II M 16 6 Steel crawler U20 3 No 1 Link 2 Bush 3 Pin ...
Страница 48: ...U20 3 U25 3 WSM Machine body Mechanism section II M 17 U25 3 No 1 Hole 2 shaft ...
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Страница 62: ...U20 3 U25 3 WSM Machine body Service section II S 13 B Front attachment a Parts designation ...
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Страница 118: ...U20 3 U25 3 WSM Engine III 3 ...
Страница 121: ...U20 3 U25 3 WSM Engine III 6 Performance curves Model D1105 EBH 10 ...
Страница 122: ...U20 3 U25 3 WSM Engine III 7 Performance curves Model D1105 EBH 11 ...
Страница 123: ...U20 3 U25 3 WSM Engine III 8 b Dimensions ...
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Страница 127: ...U20 3 U25 3 WSM Engine Mechanism section III M 2 A Feature ...
Страница 128: ...U20 3 U25 3 WSM Engine Mechanism section III M 3 B Engine body 1 Cylinder block 2 Cylinder head ...
Страница 129: ...U20 3 U25 3 WSM Engine Mechanism section III M 4 3 Crankshaft 4 Piston and piston rings ...
Страница 130: ...U20 3 U25 3 WSM Engine Mechanism section III M 5 5 Connecting rod 6 Rocker arm 7 Camshaft ...
Страница 131: ...U20 3 U25 3 WSM Engine Mechanism section III M 6 8 Fuel camshaft 9 Flywheel ...
Страница 132: ...U20 3 U25 3 WSM Engine Mechanism section III M 7 C Lubricating system 1 General ...
Страница 133: ...U20 3 U25 3 WSM Engine Mechanism section III M 8 2 Oil pump 3 Relief valve ...
Страница 134: ...U20 3 U25 3 WSM Engine Mechanism section III M 9 4 Oil filter cartridge 5 Oil pressure switch ...
Страница 135: ...U20 3 U25 3 WSM Engine Mechanism section III M 10 D Cooling system 1 General 2 Water pump ...
Страница 136: ...U20 3 U25 3 WSM Engine Mechanism section III M 11 3 Thermostat 4 Radiator not included in the basic engine ...
Страница 137: ...U20 3 U25 3 WSM Engine Mechanism section III M 12 5 Radiator cap ...
Страница 139: ...U20 3 U25 3 WSM Engine Mechanism section III M 14 F Fuel system 1 General 2 Injection pump ...
Страница 140: ...U20 3 U25 3 WSM Engine Mechanism section III M 15 ...
Страница 141: ...U20 3 U25 3 WSM Engine Mechanism section III M 16 ...
Страница 142: ...U20 3 U25 3 WSM Engine Mechanism section III M 17 3 Injection nozzle 4 Fuel filter not included in the basic model ...
Страница 143: ...U20 3 U25 3 WSM Engine Mechanism section III M 18 5 Governor ...
Страница 144: ...U20 3 U25 3 WSM Engine Mechanism section III M 19 ...
Страница 145: ...U20 3 U25 3 WSM Engine Mechanism section III M 20 6 Automatic advance timer not included in the basic model ...
Страница 146: ...U20 3 U25 3 WSM Engine Mechanism section III M 21 ...
Страница 147: ...U20 3 U25 3 WSM Engine Mechanism section III M 22 G Electrical system 1 Charging system ...
Страница 148: ...U20 3 U25 3 WSM Engine Mechanism section III M 23 H Turbo charger system ...
Страница 149: ...U20 3 U25 3 WSM Engine Mechanism section III M 24 ...
Страница 150: ...U20 3 U25 3 WSM Engine Mechanism section III M 25 ...
Страница 151: ...U20 3 U25 3 WSM Engine Mechanism section III M 26 ...
Страница 152: ...U20 3 U25 3 WSM Engine Mechanism section III M 27 ...
Страница 162: ...U20 3 U25 3 WSM Engine Service section III S 10 B General 1 Engine identification ...
Страница 163: ...U20 3 U25 3 WSM Engine Service section III S 11 2 General precaution ...
Страница 164: ...U20 3 U25 3 WSM Engine Service section III S 12 3 Tightening torques ...
Страница 165: ...U20 3 U25 3 WSM Engine Service section III S 13 4 Troubleshooting ...
Страница 166: ...U20 3 U25 3 WSM Engine Service section III S 14 ...
Страница 167: ...U20 3 U25 3 WSM Engine Service section III S 15 ...
Страница 168: ...U20 3 U25 3 WSM Engine Service section III S 16 5 Servicing specifications ...
Страница 169: ...U20 3 U25 3 WSM Engine Service section III S 17 ...
Страница 170: ...U20 3 U25 3 WSM Engine Service section III S 18 ...
Страница 171: ...U20 3 U25 3 WSM Engine Service section III S 19 ...
Страница 172: ...U20 3 U25 3 WSM Engine Service section III S 20 ...
Страница 173: ...U20 3 U25 3 WSM Engine Service section III S 21 ...
Страница 174: ...U20 3 U25 3 WSM Engine Service section III S 22 ...
Страница 175: ...U20 3 U25 3 WSM Engine Service section III S 23 ...
Страница 176: ...U20 3 U25 3 WSM Engine Service section III S 24 ...
Страница 177: ...U20 3 U25 3 WSM Engine Service section III S 25 6 Maintenance check list ...
Страница 178: ...U20 3 U25 3 WSM Engine Service section III S 26 7 Check and maintenance ...
Страница 179: ...U20 3 U25 3 WSM Engine Service section III S 27 ...
Страница 180: ...U20 3 U25 3 WSM Engine Service section III S 28 ...
Страница 181: ...U20 3 U25 3 WSM Engine Service section III S 29 ...
Страница 182: ...U20 3 U25 3 WSM Engine Service section III S 30 ...
Страница 183: ...U20 3 U25 3 WSM Engine Service section III S 31 ...
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Страница 189: ...U20 3 U25 3 WSM Engine Service section III S 37 ...
Страница 190: ...U20 3 U25 3 WSM Engine Service section III S 38 ...
Страница 191: ...U20 3 U25 3 WSM Engine Service section III S 39 C Engine body CHECKING AND ADJUSTING ...
Страница 192: ...U20 3 U25 3 WSM Engine Service section III S 40 DISASSEMBLING AND ASSEMBLING ...
Страница 193: ...U20 3 U25 3 WSM Engine Service section III S 41 1 Draining water and oil 2 External components ...
Страница 194: ...U20 3 U25 3 WSM Engine Service section III S 42 3 Cylinder head and valves ...
Страница 195: ...U20 3 U25 3 WSM Engine Service section III S 43 ...
Страница 196: ...U20 3 U25 3 WSM Engine Service section III S 44 4 Gear case ...
Страница 197: ...U20 3 U25 3 WSM Engine Service section III S 45 ...
Страница 198: ...U20 3 U25 3 WSM Engine Service section III S 46 ...
Страница 199: ...U20 3 U25 3 WSM Engine Service section III S 47 ...
Страница 200: ...U20 3 U25 3 WSM Engine Service section III S 48 ...
Страница 201: ...U20 3 U25 3 WSM Engine Service section III S 49 ...
Страница 202: ...U20 3 U25 3 WSM Engine Service section III S 50 5 Piston and connecting rod ...
Страница 203: ...U20 3 U25 3 WSM Engine Service section III S 51 ...
Страница 204: ...U20 3 U25 3 WSM Engine Service section III S 52 ...
Страница 205: ...U20 3 U25 3 WSM Engine Service section III S 53 6 Flywheel and crankshaft ...
Страница 206: ...U20 3 U25 3 WSM Engine Service section III S 54 ...
Страница 207: ...U20 3 U25 3 WSM Engine Service section III S 55 SERVICING 1 Cylinder head ...
Страница 208: ...U20 3 U25 3 WSM Engine Service section III S 56 ...
Страница 209: ...U20 3 U25 3 WSM Engine Service section III S 57 ...
Страница 210: ...U20 3 U25 3 WSM Engine Service section III S 58 ...
Страница 211: ...U20 3 U25 3 WSM Engine Service section III S 59 ...
Страница 212: ...U20 3 U25 3 WSM Engine Service section III S 60 2 Timing gear and camshaft ...
Страница 213: ...U20 3 U25 3 WSM Engine Service section III S 61 ...
Страница 214: ...U20 3 U25 3 WSM Engine Service section III S 62 3 Piston and connecting rod ...
Страница 215: ...U20 3 U25 3 WSM Engine Service section III S 63 ...
Страница 216: ...U20 3 U25 3 WSM Engine Service section III S 64 ...
Страница 217: ...U20 3 U25 3 WSM Engine Service section III S 65 4 Crankshaft ...
Страница 218: ...U20 3 U25 3 WSM Engine Service section III S 66 ...
Страница 219: ...U20 3 U25 3 WSM Engine Service section III S 67 ...
Страница 220: ...U20 3 U25 3 WSM Engine Service section III S 68 ...
Страница 221: ...U20 3 U25 3 WSM Engine Service section III S 69 ...
Страница 222: ...U20 3 U25 3 WSM Engine Service section III S 70 ...
Страница 223: ...U20 3 U25 3 WSM Engine Service section III S 71 5 Cylinder ...
Страница 224: ...U20 3 U25 3 WSM Engine Service section III S 72 ...
Страница 225: ...U20 3 U25 3 WSM Engine Service section III S 73 D Lubricating system CHECKING SERVICING 1 Oil pump ...
Страница 226: ...U20 3 U25 3 WSM Engine Service section III S 74 ...
Страница 227: ...U20 3 U25 3 WSM Engine Service section III S 75 E Cooling system CHECKING 1 Fan belt 2 Radiator ...
Страница 228: ...U20 3 U25 3 WSM Engine Service section III S 76 DISASSEMBLING AND ASSEMBLING ...
Страница 229: ...U20 3 U25 3 WSM Engine Service section III S 77 ...
Страница 230: ...U20 3 U25 3 WSM Engine Service section III S 78 F Fuel system CHECKING AND ADJUSTING 1 Injection pump ...
Страница 231: ...U20 3 U25 3 WSM Engine Service section III S 79 ...
Страница 232: ...U20 3 U25 3 WSM Engine Service section III S 80 2 Injection nozzle ...
Страница 233: ...U20 3 U25 3 WSM Engine Service section III S 81 DISASSEMBLING AND ASSEMBLING 1 Injection pump ...
Страница 234: ...U20 3 U25 3 WSM Engine Service section III S 82 2 Injection nozzle ...
Страница 235: ...U20 3 U25 3 WSM Engine Service section III S 83 G Electrical system CHECKING 1 Starter ...
Страница 236: ...U20 3 U25 3 WSM Engine Service section III S 84 2 Glow plug DISASSEMBLING AND ASSEMBLING 1 Starter ...
Страница 237: ...U20 3 U25 3 WSM Engine Service section III S 85 2 Alternator ...
Страница 238: ...U20 3 U25 3 WSM Engine Service section III S 86 ...
Страница 239: ...U20 3 U25 3 WSM Engine Service section III S 87 ...
Страница 240: ...U20 3 U25 3 WSM Engine Service section III S 88 SERVICING 1 Starter ...
Страница 241: ...U20 3 U25 3 WSM Engine Service section III S 89 ...
Страница 242: ...U20 3 U25 3 WSM Engine Service section III S 90 2 Alternator ...
Страница 243: ...U20 3 U25 3 WSM Engine Service section III S 91 ...
Страница 244: ...U20 3 U25 3 WSM Engine Service section III S 92 ...
Страница 245: ...U20 3 U25 3 WSM Engine Service section III S 93 H Turbo charger system CHECKING ...
Страница 246: ...U20 3 U25 3 WSM Engine Service section III S 94 ...
Страница 247: ...U20 3 U25 3 WSM Engine Service section III S 95 DISASSEMBLING AND ASSEMBLING ...
Страница 248: ...U20 3 U25 3 WSM Engine Service section III S 96 ...
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Страница 279: ...U20 3 U25 3 WSM Hydraulic system Mechanism section IV M 28 ...
Страница 280: ...U20 3 U25 3 WSM Hydraulic system Mechanism section IV M 29 b Pilot valve control diagram ...
Страница 296: ...U20 3 U25 3 WSM Hydraulic system Mechanism section IV M 45 U25 3 KAYABA a Structure specifications ...
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Страница 311: ...U20 3 U25 3 WSM Hydraulic system Mechanism section IV M 59 I Hydraulic circuit diagram a U20 3 Fixed undercarriage ...
Страница 312: ...U20 3 U25 3 WSM Hydraulic system Mechanism section IV M 60 b U20 3 Retractable undercarriage ...
Страница 313: ...U20 3 U25 3 WSM Hydraulic system Mechanism section IV M 61 c U25 3 ...
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Страница 330: ...U20 3 U25 3 WSM Hydraulic system Service section IV S 15 1 Travel mechanism check points ...
Страница 386: ...U20 3 U25 3 WSM Hydraulic system Service section IV S 71 Photo 7 1 Photo 7 2 Photo 7 3 Photo 7 4 Photo 7 5 Photo 7 6 ...
Страница 387: ...U20 3 U25 3 WSM Hydraulic system Service section IV S 72 Photo 7 7 Photo 7 8 Photo 7 9 Photo 7 10 Photo 7 11 Photo 7 12 ...
Страница 397: ...U20 3 U25 3 WSM Hydraulic system Service section IV S 82 ...
Страница 415: ...U20 3 U25 3 WSM Hydraulic system Service section IV S 100 3 Component parts of wheel motor ...
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Страница 480: ...U20 3 U25 3 WSM Electrical system Service section V S 3 a Front ...
Страница 482: ...U20 3 U25 3 WSM Electrical system Service section V S 5 c Swivel frame ...
Страница 483: ...U20 3 U25 3 WSM Electrical system Service section V S 6 Around battery ...
Страница 486: ...U20 3 U25 3 WSM Electrical system Service section V S 9 3 Around selector valve ...
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