10. TROUBLESHOOTING
10-1-3
10-1-4 Thermal Shock of Travel Motor
Phenomenon
When the travelling operation is made for pivot turning in cold temperatures after raising the hydraulic oil to more
than 140°F (60°C) higher than the ambient temp. through relief valve operation, etc., without travelling after starting
the engine, the machine may travel straight instead of making a pivot turn.
Reason
When the hot hydraulic oil is suddenly fed to the cold brake valve and motor, the spool in the brake valve sticks
momentarily due to thermal expansion, canceling the braking force.
Evaluation
Since the phenomenon disappears in 20 to 30 seconds and this situation is generally rare, this phenomenon pre-
sents no problem.
(Travel straight in spite of turning operation.)
Spool
Motor
Motor
Brake valve
Swivel joint
Summary of Contents for ViO12-2A
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Page 348: ...7 ADJUSTMENT AND REPAIR 7 5 31 6 Control Levers Pilot valves Control valve...
Page 349: ...7 ADJUSTMENT AND REPAIR 7 5 32 7 Upperstructure Implement Bucket cylinder Arm cylinder...
Page 351: ...7 ADJUSTMENT AND REPAIR 7 5 34 9 Undercarriage High speed travel solenoid valve...
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Page 360: ...CHAPTER 8 PERIODIC INSPECTION AND SERVICING 8 1 List of Periodic Inspection and Servicing 8 1...
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Page 364: ...CHAPTER 9 FUEL LUBE OIL AND GREASE RECOMMENDED 9 Fuel Lube Oil and Grease Recommended 9 1...
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Page 406: ...CHAPTER 11 REFERENCE DATA 11 1 Specifications for Attachment 11 1...
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