Trouble Shooting - Strong GR4 Procedures Manual

Problem: Excessive Heat
Problem
Worn parts in hydraulic pump
and/or hydraulic motors.
Oil too thin and breaking down,
causing excessive slippage.
Worn valve & parts or broken
"O" rings causing a by-pass.
Oil level too low.
Operating pressure too high.
•
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.

Trouble Shooting

(Hydraulics)
How to Determine
Measure oil temperature should
not exceed 150F. If
thermometer is not available
place hand on storage tank –
130F is uncomfortable.
Check sight gauge.
Check pressure gauge.
Trouble Shooting Procedure
18
Solution
Determine pressure by
following procedure.
Add oil.
Eliminate some of load.