Hydrostatic Drive System Troubleshooting

Table 27: Hydrostatic Drive System Troubleshooting

Problem

Travel drive does not operate in either direction

Possible Cause

Corrective Action

Parking brake is applied.Release parking brake.

Low hydraulic oil level.

Top off hydraulic oil. See “Checking Hydraulic Oil Level” on page147. See “Fluid Capacities/ Lubricants” on page187 for proper oil grade.

Low or no charge pressure. Contact dealer. Hydrostatic pump(s) relief valve malfunction.

Restraint bar not lowered.Lower restraint bar. Seat or restraint bar switch malfunction. Check switch electrical connections; repair as necessary.

Right side drive doesn’t operate in either direction; left side operates normally

Right side drive doesn’t operate in one direction

Left side drive doesn’t operate in either direction; right side operates normally

Left side drive doesn’t operate in one direction

Rear hydrostatic pump relief valve malfunction.

Rear hydrostatic pump control rod linkage malfunction.

Contact dealer.

Check linkage connection at control levers and neutral centering mechanisms. Adjust/repair as necessary. Contact dealer.

Rear hydrostatic pump relief valve malfunction. Contact dealer. Rear hydrostatic pump malfunction.

Front hydrostatic pump relief valve malfunction.

Linkage front hydrostatic pump control rod linkage malfunction.

Contact dealer.

Check linkage connection at control levers and neutral centering mechanisms. Adjust/repair as necessary. Contact dealer.

Front hydrostatic pump relief valve malfunction. Contact dealer. Front hydrostatic pump malfunction.

Hydraulic oil viscosity too heavy.

Low hydraulic oil level.

Replace existing oil with proper viscosity oil. See “Fluid Capacities/Lubricants” on page187. Allow longer warm-up.

Top off hydraulic oil. See “Checking Hydraulic Oil Level” on page147. See “Fluid Capacities/ Lubricants” on page187 for proper oil grade.

Travel drive system noisy

Air in hydraulic system.

Cycle lift and tilt cylinders to maximum stroke and maintain pressure for short time to clear air from system. Also check for low oil level in reservoir; top off as necessary.

Drive motor(s) or hydrostatic pump(s) internal damage/ leakage. Contact dealer.