Travel circuit · High
Travel is weak, or dies on a grade
Flat ground is fine; a slope is not. Weak travel with a normal swing almost always lives in the two-speed control, the travel relief, or the final drive — not in the main pump.
What it usually is
| Share of cases | Cause and how to check it |
|---|---|
| 32% | Two-speed solenoid or displacement control stuck in high speed Switch speed 1 / speed 2 and watch travel speed and pressure change. No change means the control is stuck. |
| 30% | Travel relief valve leaking Stall one track against a bank, read the gauge at the motor port, compare with the catalogue setting. |
| 23% | Final drive / planetary wear Drain the gear oil: metal paste on the plug magnet means the reducer, not the hydraulics. |
| 15% | Main pump delivery down (both functions affected) If swing and arm are also slow, test the pump before touching travel. Flow test, not pressure. |
Field tests
1. Stall pressure, both tracks
One track at a time against an immovable bank. Compare left and right; within 1 MPa means the fault is shared.
2. Speed switching
Speed 2 to speed 1 should halve travel speed and roughly double torque. Watch it happen, do not trust the switch light.
3. Gear oil
Fifty millilitres from the drain plug tells you more about a final drive than an hour on the gauge.
What actually fixes it
A travel assembly is a motor plus a reducer, sold and shipped as one unit — which is why the quote should state whether the fault is hydraulic or mechanical before it is issued.
Send the plate, get the variant in writing.
One photo of the nameplate and one of the pump from the side. We confirm the variant, then quote — the price holds for seven days.