Specifications

MAINTENANCE

550 Gas/LPG 330650 (9--00)

HYDRAULIC COMPONENTS

TROUBLESHOOTING

Problem

Cause Remedy

Hydraulic cylinder failure Piston seals leaking Install seal kit

Barrel worn or rod bent Replace cylinder

Hydraulic control valve failure Valve seals leaking Install seal kit

Solenoid failure Replace solenoid

Solenoid spool sticking Replace valve section

Check valve st icking Replace valve

Relief valve stuck open (leaking) Clean or replace relief valve

Hydraulic steering valve failure Valve leaking Install seal kit

Drive link failure Replace drive link

Thrust bearing worn Replace thrust bearing

Gerotor worn Replace gerotor set

Hydraulic motor failure Motor leaking Install seal kit

Drive link failure Replace drive link

Gerotor worn Replace gerotor set

Output shaft failure Replace output shaft and bearings

Hydraulic vane pump failure Pump leaking Install seal kit

Vane set failure Replace vane set

Relief valve stuck Replace relief valve

Engine-to-pump coupling failure Replace coupling

Hydraulic piston pump failure Pump leaking Install seal kit

Relief valve stuck Clean or replace relief valve

Integral charge pump failure Replace charge pump

Rotating group worn Replace rotating group

Shaft failure Replace shaft

Backplate worn Replace backplate

Engine-to-pump coupling failure Replace coupling

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