Troubleshooting Guide

ProblemPossible CauseRemedy

Lift/tilt controls fail to respondHydraulic oil viscosity too heavy

Solenoid valve(s) malfunctioning

Allow longer warm-up or replace with proper viscosity oil.

Check electrical connections to solenoid and repair connections as needed. Perform “Solenoid Valve Test.” Replace solenoid as needed.

Hydraulic oil level low

Hydraulic oil flow to the gear pump blocked

System relief valve malfunctioning Drive disconnected

Sheared spline or broken shaft in hydrostatic pump assembly

Sheared spline or broken shaft in gear pump

Restraint bar switch or seat switch not closing

Lift arm does not raise; bucket tilt works properly

Lift spool in control valve not actuated or leaking

Lift solenoid malfunctioning

This troubleshooting guide lists potential hydraulic system problems, as well as possible causes and remedies, for Gehl R105 and Mustang 1050R skid-steer loaders.

If you cannot locate a particular hydraulic system problem in this chart, consult the Hydrostatic System chapter troubleshooting chart.

When a problem occurs, don’t overlook simple causes. A malfunction could be caused by something as simple as low fluid level in the hydraulic reservoir. After a mechanical failure has been corrected, be sure to locate the cause of the problem.

Check oil level in reservoir. If oil is low, check for an external leak. Repair and add oil.

Inspect suction hose. Clean or replace as needed.

Adjust or replace relief valve as needed.

Check for broken or worn pump drive coupling. Replace as needed.

Check splined shaft of pump closest to engine. Replace shaft if broken or if splines are sheared.

Remove gear pump from hydrostatic pump and inspect the splined shaft and coupler. Replace components as needed.

Check switches and wiring. Replace as needed.

Check hose or tube connection to valve. Check pressure and flow.

Check electrical connections to solenoid. Repair or replace as needed.