8 8-9 TROUBLESHOOTING 8.2 8.2D Hydraulic System 8.2D Hydraulic System Symptom Cause Remedy Hydraulic action jerky Reservoir low on oil Replenish with 10W30 API or 20W50 SJ oil. Air in hydraulic system Check for leak between reservoir and pump. Bleed System by extending and retract- ing lift cylinders several times.
Anti-cavitation check valve not functioning Inspect and repair or replace Boom raises slowly at full engine rpm Reservoir low on oil Replenish with 10W30 or 20W50 API SJ oil Foot pedal linkage binding Inspect and adjust Auxiliary foot pedal engaged Disengage Engine rpm too slow Check rpm and reset Anti-cavitation check valve spring broken Replace Pressure relief valve in control valve faulty Check pressure if neces- sary - adjust Internal leakage in pump due to wear Check pump flow and repair or replace as neces- sary Oil bypassing one or both lift cylin- der piston seals Install new piston seal kits Lift or tilt cylinders will not support a load External leak between or at con- trol valve and cylinders Check for leaks and cor- rect Control valve spool not center- ing Check for sticking foot pedal linkage Check for broken or stuck return spring on valve spool Oil leaking by one or both cylinder piston seals Install new piston seal kits Hydraulic oil overheating Hydraulic oil overheating Reservoir low on fluid Replenish with 10W30 or 20W50 API SJ oil Oil cooler plugged or dirty (also check engine radi- ator) Clean cooling fins Symptom Cause Remedy Loss of hydraulic power (no flow from gear pump) Reservoir low on fluid hose or fitting leak.
Replenish with 10W30 or 20W50 API SJ oil. Check for leaks. Universal Joint between engine and pump failure Inspect and replace damaged parts. Check for misalignment between engine and pumps. Spline coupling fail- ure between front and rear hydrostatic pump Inspect coupling for sheared splines. Also check pump shaft bearings. Hydraulic gear pump not functioning Reservoir low on fluid Inspect and repair. Replenish with 10W30 or 20W50 API SJ oil Loss of hydraulic power (flow from gear pump) Loss of hydraulic power (flow from gear pump) Foot pedal linkage disconnected or bind- ing Inspect and adjust.
Auxiliary foot pedal engaged Disengage Relief valve failure in control valve Check pressure and adjust. Hydraulic oil overheating Auxiliary foot pedal engaged Disengage Hydraulic oil overheating Auxiliary foot pedal engaged Engine rpm too slow Check rpm and adjust Incorrect temperature sensor Replace Foot pedals do not oper- ate smoothly Foot pedals do not oper- ate smoothly Foot pedal linkage out of adjustment Adjust foot pedal link- ages Foot pedal linkages need lubrication Lubricate with a sili- cone based lubricant Cable Binding Cable Binding Check routing for kinks etc.