Swing System Troubleshooting; Precautions/Initial Checks - Doosan DX140R Shop Manual

SWING SYSTEM
TROUBLESHOOTING

Precautions/Initial Checks

1. Stop work. Release all weight or any type of load safely
before proceeding. Avoid risking injury or adding to
damage.
2. Shut down engine and disengage control functions until
initial tests are ready to be made.
Prevent possible injury and/or loss of operating control.
Stop work and park the excavator at the first indication of:
1. Equipment breakdown.
2. Inadequate control response.
3. Erratic performance.
Stop the machine, put the boom and arm in the inoperative
(overnight park) position and begin by making the fastest,
simplest checks first:
• Check oil level.
• Check for overheating, oil leaks, external oil cooler
clogging or broken fan belt. Consult service record for
prior repair/service work.
• Drain some tank oil into a clean, clear container. Look
for metal shavings/grit, cloudiness/water or foam/air
bubbles in the oil.
Dispose of drained fluids according to
NOTE:
local regulations.
• Check for wobble through the engine/pump flex
coupling. Run engine with the pump input hydraulic
power control nut turned to the lowest power to check
the engine.
• Investigate unusual operating noises or vibration.
Check for loose bolts, connections.
Hydraulic System Troubleshooting, Testing and Adjustment
WARNING
SP001942
Page 27