Winch Circuit
WINCH WILL NOT DEVELOP MAXIMUM LINE PULL
CAUSE REMEDY
Main relief valve is set too low Readjust the main relief
Main relief valve is sticking See section on “Relief Valves”
Winch motor worn excessively or damaged See section on “Fluid Motor”
Tandem pump worn excessively or damaged See section on “Pumps”
Rotary manifold leaking internally Reseal rotary manifold
Low oil level Add oil as required
WINCH WILL LOWER BUT WILL NOT RAISE
CAUSE REMEDY
The sprag clutch is assembled backwards Be certain that the winch is assembled
properly
Insufficient parts of line for the load being
lifted
See the reeving diagram on the capacity chart
WINCH WILL RAISE BUT WILL NOT LOWER
CAUSE REMEDY
The winch hold valve is mounted on the
winch motor incorrectly
Be certain that the winch is assembled
properly
The winch hold valve spool is sticking Repair or replace
The winch brake is not releasing Be certain that the brake release line is
open. If necessary, disassemble and inspect
the brake components
Winch brake piston “O” ring damaged Replace “O” ring
WINCH WILL NOT HOLD LOAD (LOAD DRIFTS DOWN)
CAUSE REMEDY
System back pressure too high Warm oil: check for restriction in down
stream flow
The over-running sprag on the brake is broken Inspect and replace, if necessary
The automatic brake is not applying Be certain that the winch brake release line
is not plugged and no foreign objects are in
the brake assembly
The winch brake friction plates are worn Replace friction plates
T300-1_T500-1_T780
Troubleshooting
408 P/N 12261-683
REVISED: January 2015
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