Troubleshooting — Hydrostatic Drive System Hydrostatic Drive System NOTE: Also see “Work Hydraulics Troubleshooting” on page 103 and “Drive Hydraulics Diagnostics” on page 111.
Problem No response from either hydrostatic drive or the lift/tilt systems
Possible Cause Hydraulic oil viscosity too heavy
Corrective Action Allow longer warm-up; replace with proper grade hydraulic oil, see “Fluid Capacities/ Lubricants” on page 11 for proper oil grade Also see “Work Hydraulics Troubleshooting” on page 103 and “Drive Hydraulics Diagnostics” on page 111
Drive will not operate in either direction
Parking brake is engaged
Disengage parking brake
Low hydraulic oil level
Add oil
Low or no charge pressure
Check charge pressure. Check relief pressure. Adjust or replace
Hydrostatic pump(s) relief valves malfunction
Check relief pressure. Adjust or replace
Brake/inch pedal stuck or malfunctioning
1. Check/release brake/inch pedal 2. Check drive error code
Throttle pedal sensor linkage
Check/repair throttle pedal linkage Check drive controller error codes, see “Drive Controller Error Codes” on page 172 and “Electrical Status Error Reporting Screen” on page 177
Electrical connections Hydrostatic (drive) system noisy
50940008/AP0311
Check/inspect electrical connection and harness
Hydraulic oil viscosity too heavy
Allow longer warm-up, see “Fluid Capacities/Lubricants” on page 11 for proper oil grade
Low hydraulic oil level
Add oil
Air in hydraulic system
Cycle 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.
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