Troubleshooting
The charts thatfollow contain information toassist inhy-
draulic system troubleshooting. There may possibly be
more than one cause for a machine malfunction.
Refer to the Testing section of this Chapter for precau-
tions and specific testing procedures.
General Hydraulic System Problems
Problem
Possible Cause
Engine RPM is too low.
Hydraulic system operates hot.
NOTE: An indication that the hy-
draulic system is operating at exces-
sive temperatures would be frequent
reversing of the cooling fan and a
normal engine coolant temperature.
Hydraulic reservoir oil level is low.
Hydraulic oil is contaminated or the wrong type.
Brakes are applied or sticking.
Piston pump bypass valve is open or damaged.
Cooling system is not operating properly.
Charge pressure is low.
Engine cooling fan circuit is malfunctioning (see Engine Cooling Fan
Circuit Problems in this section).
Traction circuit pressure is incorrect.
Pump(s) or motor(s) are damaged.
Hydraulic reservoir oil level is low.
Hydraulic oil in reservoir foams.
Hydraulic oil leak(s).
Wrong type of oil is in the hydraulic system.
Air is leaking in suction line.
Fitting(s), hose or tube loose or damaged.
Missing or damaged O-ring in fitting.
Groundsmaster 4500--D/4700--D
Page 4 -- 35
Hydraulic System
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