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 hydraulic 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
or noise has a potential for failure. Should either of these
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) are loose or damaged.
Hydraulic oil leaks
O–ring(s) or seal(s) are missing or damaged.
Oil level in reservoir is low.
Foaming hydraulic fluid
Hydraulic system has wrong kind of oil.
Pump suction line(s) has an air leak.
Hydraulic system operates hot
Traction system pressure is high due to excessive load.
Oil level in reservoir is low.
Traction pump by–pass valve is open or defective.
Excessive dirt and debris on hydraulic components.
Oil is contaminated or too light.
Charge pressure is low.
Air trapped in traction circuit.
Wheel motor(s) are worn or damaged.
Traction pump is worn or damaged.
Neutral is difficult to find or unit oper-
ates in one direction only
External control linkage is misadjusted, disconnected, binding or
damaged.
Excess air in the traction lines.
Traction pump is worn or damaged.
Hydraulic oil is very cold.
Traction response is sluggish
Traction pump by–pass valve is open or worn.
Engine speed is too low.
Pump drive belt is loose or worn.
Charge pressure is low.
Traction pump or wheel motor(s) are worn or damaged.
Hydraulic System
Page 4 – 14
ProCore 648
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