HYDRAULIC SYSTEM
GEHL R105 / MUSTANG 1050R
Troubleshooting Guide Problem Lift/tilt controls fail to respond
Lift arm does not raise; bucket tilt works properly
Possible Cause
Remedy
Hydraulic oil viscosity too heavy
Allow longer warm-up or replace with proper viscosity oil.
Solenoid valve(s) malfunctioning
Check electrical connections to solenoid and repair connections as needed. Perform “Solenoid Valve Test.” Replace solenoid as needed.
Hydraulic oil level low
Check oil level in reservoir. If oil is low, check for an external leak. Repair and add oil.
Hydraulic oil flow to the gear pump blocked
Inspect suction hose. Clean or replace as needed.
System relief valve malfunctioning
Adjust or replace relief valve as needed.
Drive disconnected
Check for broken or worn pump drive coupling. Replace as needed.
Sheared spline or broken shaft in hydrostatic pump assembly
Check splined shaft of pump closest to engine. Replace shaft if broken or if splines are sheared.
Sheared spline or broken shaft in gear pump
Remove gear pump from hydrostatic pump and inspect the splined shaft and coupler. Replace components as needed.
Restraint bar switch or seat switch not closing
Check switches and wiring. Replace as needed.
Lift spool in control valve not actuated or leaking
Check hose or tube connection to valve. Check pressure and flow.
Lift solenoid malfunctioning
Check electrical connections to solenoid. Repair or replace as needed.
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. 112
50950298/AP0517
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