15
B
TROUBLE “B” CONTINUED
FROM PREVIOUS PAGE
3. The drum clutch piston seals may
be leaking.
A. Disconnect the drum clutch release
hose from the drum clutch housing.
Connect a hand pump with an accu-
rate gauge and shut-off valve to the –6
adapter.
B. Apply 500 PSI (34.5 bar) to the drum
clutch. Close the shut-off valve and let
stand for five minutes.
C. If there is a loss of pressure during
the five minutes, the drum clutch hous-
ing must be removed and disassembled
for inspection of the seals and sealing
surfaces. Refer to Drum Clutch Service
section of this manual for additional infor-
mation.
C
Brake will not hold a load with the
control lever in neutral.
1. Excessive system back pressure
acting on the brake release port.
2. Friction brake will not hold due to
worn or damaged brake discs.
3. Brake clutch may be slipping.
4. If winch was field installed, check
to see that the proper stack valve
section was used (motor spool
required).
5. Drum clutch discs may be worn.
A. The pressure at the lowering port of
the motor is also directed to the brake
release port. This pressure must drop
below 50 PSI (3.4 bar) when the con
-
trols are returned to neutral, BRAKE-ON.
Trace the hydraulic circuit back to the
reservoir to locate source of back pres-
sure.
A. Same as A3A.
A. Improper planetary gear oil may cause
the brake clutch to slip. Drain the old gear
oil and flush the winch with a mild sol-
vent. Thoroughly drain the cleaning sol-
vent, and refill the winch with the recom-
mended gear oil listed in the Preventive
Maintenance section.
B. Overrunning brake clutch may be worn
or damaged. Disassemble and inspect as
described in Overrunning Brake Clutch
Service section of this manual.
A. Disassemble and inspect drum clutch
components as described in Drum Clutch
Service section.
TROUBLE
PROBABLE CAUSE
REMEDY
TROUBLESHOOTING
