U20-3, U25-3 WSM
Hydraulic system (Service section)
IV
-S-77
[3] Trouble shooting
It is not easy to pinpoint trouble spots. The table below lists some typical problems, their possible causes
and corrections. Before starting repair jobs, refer to the table below.
A machine trouble is not necessarily caused by just one part, but by come different parts combined. It
should be noted that the corrections listed below might not be enough and additional measures might be
needed.
This chart does not cover all possible causes and corrections. Whenever necessary, it is therefore
essential for the repair supervisor to look further into the problem and cause in question.
Problem
Causes
Corrections
Secondary pressure failure to rise
(1) Primary pressure too low.
(2) Secondary-pressure spring (241)
broken or worn out.
(3) Too large a gap between the spool
(201) and casing (101).
(4) Steering wheel too loose.
(1) Ensure the specified primary
pressure.
(2) Replace the spring with new one.
(3) Replace the remotely operated valve
with new one.
(4) Disassemble and reassemble the
related section. Or replace the
steering wheel as required.
Secondary pressure unstable
(1) Sliding parts stuck.
(2) Tank line pressure fluctuating too
much.
(3) Air sucked in the piping.
(1) Correct the stuck spot.
(2) Return the oil direct to the oil tank.
(3) Operate the machine to let out the
air.
Secondary pressure too high
(1) Tank line pressure too high.
(2) Sliding parts stuck.
(1) Correct the stuck spot.
(2) Return the oil direct to the oil tank.
Photo 7-37
Photo 7-38
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 ...
Страница 184: ...U20 3 U25 3 WSM Engine Service section III S 32 ...
Страница 185: ...U20 3 U25 3 WSM Engine Service section III S 33 ...
Страница 186: ...U20 3 U25 3 WSM Engine Service section III S 34 ...
Страница 187: ...U20 3 U25 3 WSM Engine Service section III S 35 ...
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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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