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