Troubleshooting
The cause of an improperly functioning hydraulic sys-
tem is best diagnosed with the use of proper testing
equipment and a thorough understanding of the com-
plete hydraulic system.
Continued use of an improperly functioning hydraulic
system could lead to extensive internal component
damage.
The charts that follow contain information to assist in
troubleshooting. There may possibly be more than one
cause for a machine malfunction.
A hydraulic system with an excessive increase in heat
ornoisehasapotential forfailure.Shouldeitherofthese
conditions be noticed, immediately stop the machine,
turn off the engine, locate the cause of the trouble, and
correct it before allowing the machine to be used again.
Refer to the Testing section of this Chapter for precau-
tions and specific test procedures.
Problem
Possible Cause
Fitting(s), hose(s) or tube(s) is (are) loose or damaged.
Hydraulic oil leaks
O--ring(s) or seal(s) is (are) missing or damaged.
Oil level in reservoir (front axle) is low.
Foaming hydraulic fluid
Hydraulic system has wrong kind of oil.
Pump suction line has an air leak.
Hydraulic system operates hot
Traction system pressure is high due to excessive load or brakes
applied.
Oil level in reservoir (front axle) is low.
Oil is contaminated or too light.
Engine speed is too low.
Oil cooler is damaged or plugged. Air flow through oil cooler is ob-
structed.
Oil filter is plugged.
Charge pressure is low.
Hydrostat check valve is not seating or is damaged.
Hydrostat is worn or damaged.
Traction jerky when starting
Friction wheel on traction pedal out of adjustment or worn.
Traction control linkage is misadjusted, disconnected, binding or
damaged.
Hydrostat check valve is not seating or is damaged.
Neutral is difficult to find or unit oper-
ates in one direction only
Traction control linkage is misadjusted, disconnected, binding or
damaged.
Hydrostat check valve is not seating or is damaged.
Hydrostat is worn or damaged.
Hydraulic System
Page 5 -- 16
Groundsmaster 3280--D/3320
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