18
Trouble Shooting
(Hydraulics)
Problem:
Excessive Heat
Problem
How to Determine
Solution
Worn parts in hydraulic pump
and/or hydraulic motors.
Measure oil temperature should
not exceed 150F. If
thermometer is not available
place hand on storage tank –
130F is uncomfortable.
Determine pressure by
following procedure.
Oil too thin and breaking down,
causing excessive slippage.
Worn valve & parts or broken
“O” rings causing a by-pass.
Oil level too low.
Check sight gauge.
Add oil.
Operating pressure too high.
Check pressure gauge.
Eliminate some of load.
Trouble Shooting Procedure
•
Break and plug a line at the control valve between the hydraulic pump and control valve, but
downstream from pressure relief valve.
•
Insert 0-3000 PSI pressure gauge in line.
•
Start engine and run at idle speed and clutch disengaged.
•
If pressure does not put up 2000 PSI of pressure, pump is worn, or relief valve is set too low.
•
To check relief valve, remove acorn nut and screw in on the slot headed screw. Do so until
pressure gauge reads 2000 PSI.
•
If at this time pressure does not rise to 2000 PSI, hydraulic pump is worn and should be replaced.
•
If pump produces sufficient pressure, insert pressure gauge between control valve and motor.
•
Disconnect hydraulic line nearest valve foot pedal and insert pressure gauge. Plug line at motor.
•
Push control valve forward and read hydraulic pressure.
•
If pressure does not come up to 2000 PSI, control valve should be replaced.
•
If relief valve and pump have checked out, the problem is the motor and should be replaced.