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Groundsmaster 4000--D/4010--D Hydraulic SystemPage 4 -- 33
Troubleshooting
The charts that follow contain suggestions that can be
used to assist in diagnosing hydraulic system perfor-
mance issues. The suggestions are not all--inclusive.
Also, consider that there may be more than one cause
for a machine problem.
Review the hydraulic schematic and information on hy-
draulic system operation in the Hydraulic Flow Dia-
grams section of this Chapter. This information will be
useful during the hydraulic troubleshooting process.
Refer to the Testing section of this Chapter for precau-
tions and specific hydraulic test procedures.
General Hydraulic System Problems
Problem Possible Cause
Hydraulic oil leaks from machine Fitting(s), hose(s) or tube(s) is (are) loose or damaged.
O--ring(s) or seal(s) is (are) missing or damaged.
Hydraulic system operates hot.
NOTE: An indication that the h y-
draulic system is operating at exces-
sive temperatures would be frequent
reversing of the cooling fan and a
normal engine coolant temperature.
Engine RPM is too low.
Brakes are applied or sticking.
Hydraulic reservoir oil level is low.
Hydraulic oil is contaminated or the wrong type.
Piston pump by--pass valve is open or damaged.
Cooling system is not operating properly.
Charge pressure is low.
Traction circuit pressure is incorrect.
Pump(s)ormotor(s)aredamaged.
Hydraulic oil in reservoir foams. Hydraulic reservoir oil level is low.
Wrong type of oil is in the hydraulic system.
Air is leaking into a pump suction line.
Hydraulic
System