14
TROUBLE
PROBABLE CAUSE
REMEDY
A
Winch will not smoothly reel-out
the load, or smoothly lower a sus-
pended load.
1. The problem could be a plugged
pilot orifice in the brake valve.
A plugged orifice may prevent
the spool from moving or prevent
the spool from moving smoothly,
causing jumping or chattering as
the load is released.
2. The multidisc static brake may not
be releasing as a result of a defec-
tive brake cylinder seal.
NOTE:
If the brake cylinder seal is
defective, you may notice oil leak-
ing from the winch vent plug as
hydraulic oil fills the gear cavity.
3. The multidisc static brake will not
release as a result of damaged
brake discs.
A. Disassemble the brake valve. Clean
and inspect all parts. Make certain the
.020 inch (0.5 mm) pilot orifice is not
obstructed.
A. Check the brake cylinder seal as fol-
lows:
Disconnect the small hose from the brake
release port. Connect a hand pump with
an accurate gauge and shut-off valve to
the –4 fitting in the brake release port.
Apply 1,000 PSI (68.9 bar) to the brake.
Close the shut-off valve and let stand for
five minutes.
If there is any loss of pressure during the
five minutes, the brake housing assem-
bly should be disassembled for inspec-
tion of the brake cylinder and piston
sealing surfaces and replacement of the
seals. Refer to Brake Housing Assembly
Service for more information.
A. Disassemble the brake housing
assembly to inspect the brake discs.
Replace the brake discs as required.
B
Oil leaks from vent plug.
1. Same as A2.
2. Motor seal may be defective as a
result of high system back pres-
sure or contaminated oil.
A. Same as A2A.
A. Case drain circuit back pressure must
not exceed 30 PSI (2 bar) measured at
the case drain port. Inspect the hydraulic
system for a restriction.
B. Oil analysis may indicate contamina-
tion, which could result in a worn motor
shaft and seal. Thoroughly flush the
entire hydraulic system and install new
filters and oil. Install a new motor seal or
replace the motor as needed.
TROUBLESHOOTING
After troubleshooting the winch and its hydraulic system as covered in the Troubleshooting section of this manual, and
the problem is determined to be in the winch, disassemble the winch according to the Winch Disassembly section of
this manual.