4. MAINTENANCE 4. 14 TROUBLESHOOTING 1. Hydraulic System Contact Authorized Equipment Dealer for all major fixes under the remedy column except for regular service (ie. Replenish fluids, tightening etc.) 61 Problem Cause Remedy Loss of hydraulic power (no flow from gear pump) Reservoir low on fluid Replenish with 10W30 API SJ oil. Check for hose or fitting leaking. Coupling between engine and pump failure Inspect and replace damaged parts. Check for misalignment between engine and pumps. Spline coupling failure between front and rear hydrostatic pump Inspect coupling for sheared splines. Also check pump shaft bearings. Hydraulic gear pump not functioning Inspect and repair.
Loss of hydraulic power (flow from gear pump) Reservoir low on fluid Replenish with 10W30 API SJ oil. Foot pedal linkage disconnected or binding Inspect and adjust. Auxiliary hydraulics engaged Disengage. Relief valve failure in control valve Check pressure and adjust. Hydraulic action jerky Reservoir low on oil Replenish with 10W30 API SJ oil. Air in hydraulic system Check for leak between reservoir and pump. Bleed system by extending and retracting lift cylinders several times. Anticavitation check valve not functioning Inspect and repair or replace. Hydraulic Overheat Engine fan not turning Inspect fan v-belt. Adjust or replace. Incorrect temperature sensor Replace.
Reservoir low on fluid Replenish with 10W30 API SJ oil. Oil cooler plugged or dirty (also check engine radiator) Clean cooling fins. Auxiliary engaged Disengage. Lift arms raise slowly at full engine RPM Reservoir low on oil Replenish with 10W30 API SJ oil. Foot pedal linkage binding Inspect and adjust. Auxiliary engaged Disengage. Engine RPM too slow Check RPM and reset. Anticavitation check valve spring broken Replace. Main relief or port relief valve in control valve faulty Check pressure, if necessary - adjust. Internal leakage in pump due to wear Check pump flow and repair or replace as necessary. Oil bypassing one or both lift cylinder piston seals Install new piston seal kits.
Lift or tilt cylinders will not support a load External leak between or at control valve and cylinders Check for leaks and correct. Control valve spool not centering Check for sticking foot pedal linkages. Check for broken or stuck return spring on valve spool. Oil leaking by one or both cylinder piston seals Install new piston seal kits.