Fault Phenomenon: Komatsu PC200 excavator veers left when driving straight.

Troubleshooting Process:
– Checked motors: severe internal leakage in right travel motor.
– Checked multi-way valve: travel valve spool stuck.
– Checked tracks: tension inconsistent between sides.
– Checked gearbox: high resistance in left final drive.

Root Cause: Internal wear in the right travel motor causes internal leakage, resulting in lower speed under the same pressure compared to the left side, causing veering.

Required Parts: Repair or replace right travel motor.