8-2 Published 08/16/19 Control # 112-05
TROUBLESHOOTING 500E2 SERVICE MANUAL
Poor hydraulic system
performance
Pump not operating at proper speed.
Check PTO ratio, pump size and engine speed for
proper oil flow
Low hydraulic fluid supply. Check and fill as required.
Relief valve sticking. Remove and clean.
Relief setting too low. Readjust to proper setting.
Worn pump, motor or cylinder. Replace bad part.
Plugged filter. Change filter.
Valve spools not fully open. Adjust linkage so valve has full throw.
Boom holding valves out of adjustment. Adjust or clean as required.
Oil temperature too high.
Reduce engine speed, slow cycle time to cool oil or
add oil cooler option.
Hydraulic oil too cold or dirty. Warm oil or use less viscous oil.
Line restricted. Check lines; clean and repair as necessary.
Internal control valve crack. Replace valve.
Load too heavy. Check Capacity Chart and reduce load.
Swing moves erratic or
loosely (Standard
system)
Loose turntable bearing. Torque bearing mounting bolts.
Loose swing gearbox mounting bolts. Tighten bolts.
Worn gears or bearing. Replace worn parts or adjust gearbox spacing.
Operator control of lever too erratic. Operate controls smoothly.
Motor counterbalance valves dirty or not
set properly.
Clean or replace counterbalance valves not set at
600 psi.
Brake not holding properly.
Replace worn brake parts or shim brake to proper
torque.
Replace worn brake parts or shim brake to proper
torque
Brake releasing at wrong time or
erratically.
Bleed air from brake with bleed screw on side of
brake.
Swing speed adjustment set too low. Adjust valve on turn motor.
Swing will not turn
(Standard System)
Turn circuit relief valves sticking. Clean and check circuit pressure.
Turntable bearing drag. Lubricate thoroughly as rotating boom.
Brake not releasing properly.
Check for 200 + PSI brake pilot pressure. Clean
pilot line or adjust motor counterbalance valves.
Adjust or clean brake for proper release.
Swing speed adjustment set too low. Adjust valve on turn motor.
HYDRAULIC SYSTEM TROUBLESHOOTING CHART
Condition Possible Cause Possible Solution
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