14
The following troubleshooting section is provided as a general guide. You may also need to contact the original equipment
manufacturer (OEM) for additional information.
A
Winch will not reel out under load
or does not reel out smoothly.
Remove the pilot hose and fitting from
the brake valve, then use a 5/32-inch
Allen wrench to remove the pilot orifice.
The diameter of the orifice is approxi
-
mately .020 inches (.5 mm). Clean and
install the pilot orifice tightly in the brake
valve.
Check brake cylinder seal as follows:
A. Disconnect the hose from the brake
release port. Connect a hand pump with
accurate 0–2,000 PSI (0–137.9 bar)
gauge and shut-off valve to the fitting in
the brake release port.
B. Apply 1,000 PSI (68.9 bar) to the
brake. Close shut-off valve and let stand
for five minutes.
C. If there is any loss of pressure in five
minutes, the brake cylinder should be
disassembled for inspection of the seal-
ing surfaces and replacement of the
seals. Refer to Brake Service section of
this manual.
Disassemble brake to inspect brake
discs. Check stack-up height as de-
scribed in Brake Service section of this
manual.
1. The problem could be a plugged
or loose pilot orifice. The pilot orifice
is a small pipe plug with a hole drilled
through it, located behind the pilot port
fitting on the brake valve. If it becomes
plugged, it will prevent the pilot pres-
sure, from the manifold, from opening
the brake valve. If it becomes loose, it
will allow an unregulated amount of oil
in to operate the brake valve causing er-
ratic brake valve operation.
NOTE:
Some brake valves do not use a
separate pilot orifice plug.
2. The friction brake may not be releas-
ing as a result of a defective brake cyl-
inder seal.
NOTE:
If the brake cylinder seal is de-
fective you will usually find oil leaking
from the winch vent plug.
3. Friction brake will not release as a re-
sult of damaged brake discs.
TROUBLE
PROBABLE CAUSE
REMEDY
TROUBLESHOOTING
If a winch exhibits any sign of:
• Erratic operation such as poor load control, load creep, or chatter
• Unusual noise
• Oil leaks
• A sudden increase in wear particles from oil analysis
Then the winch
MUST
be removed from service until the problem has been corrected. If a winch has been subjected
to a sudden heavy load (shock-load) or overload, the winch must be removed from service, disassembled, and all
internal components thoroughly inspected for damage. Continued operation with a defect may result in loss of load
control, property damage, injury, or death.
!
WARNING
!
