Troubleshooting — Hydrostatic Drive System

Hydrostatic Drive System

NOTE: Also see “Work Hydraulics Troubleshooting” on page103 and “Drive Hydraulics Diagnostics” on page111.

ProblemPossible CauseCorrective Action

No response from either hydrostatic drive or the lift/tilt systems

Hydraulic oil viscosity too heavyAllow longer warm-up; replace with proper grade hydraulic oil, see “Fluid Capacities/ Lubricants” on page11 for proper oil grade

Also see “Work Hydraulics Troubleshooting” on page103 and “Drive Hydraulics Diagnostics” on page111

Drive will not operate in either direction

Parking brake is engagedDisengage parking brake

Low hydraulic oil levelAdd oil

Low or no charge pressureCheck charge pressure. Check relief pressure. Adjust or replace

Hydrostatic pump(s) relief valves malfunction

Brake/inch pedal stuck or malfunctioning

Check relief pressure. Adjust or replace

1. Check/release brake/inch pedal

2. Check drive error code

Throttle pedal sensor linkageCheck/repair throttle pedal linkage

Check drive controller error codes, see “Drive Controller Error Codes” on page172 and “Electrical Status Error Reporting Screen” on page177

Electrical connections

Check/inspect electrical connection and harness

Hydrostatic (drive) system noisyHydraulic oil viscosity too heavyAllow longer warm-up, see “Fluid Capacities/Lubricants” on page11 for proper oil grade

Low hydraulic oil levelAdd oil

Air in hydraulic systemCycle lift and tilt cylinders to maximum stroke and maintain pressure for short time to clear air from system

Drive motor(s) or hydrostat pump(s) internal damage/ leakage

Check drive pressure. Inspect drive motor/hyrostat pump. Repair/replace as necessary.