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.
NOTE: When troubleshooting traction problems on
your Groundsmaster, if a problem exists in both Low
(4WD) and Hi (2WD) speeds, consider a faulty compo-
nent that affects the entire traction circuit (e.g. charge
circuit, traction relief valves, piston pump, front wheel
motors). If the problem exists in Low (4WD) but not in Hi
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.
(2WD),
(e.g. rear axle motor, 4WD manifold).
consider a problem in the 4WD traction system
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.
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.
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) or motor(s) are damaged.
Hydraulic reservoir oil level is low.
Hydraulic oil in reservoir foams.
Wrong type of oil is in the hydraulic system.
Air is leaking into a pump suction line.
Hydraulic System
Page 4 -- 30
Groundsmaster 4000--D/4010--D
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