12
A.
Winch will not
pull maximum
load.
1. System relief valve may be set too
low.
2. If this trouble occurs suddenly after
working at maximum pull, a particle of
dirt may be lodged under the system
relief valve, holding it partially open. If
this is the cause, a considerable loss
in line speed may be noticed as the
load on the cable is increased.
3. If the pump is belt driven, the belt may
be slipping.
4. The oil level in the reservoir may be
too low. The suction line may be
restricted or have an air leak causing
cavitation at the inlet port. This will
cause the pump to make a whining
noise.
5. The winch may be mounted on an
uneven or flexible surface which caus-
es distortion of the winch base and
binding of the gear train. Binding in
the gear train will absorb horsepower
needed to generate the rated line pull
and cause heat.
6. Be certain hydraulic system tempera-
ture is not more than 180
o
F (82
o
C).
Excessive hydraulic oil temperatures
increase motor internal leakage and
reduce motor performance.
7. Winch line pull rating is based on 1st
layer of wire rope. Expected line pull
may be in excess of winch rating.
8. After all the causes listed above have
been investigated and it is found that
the winch will stall at maximum pres-
sure without developing the maximum
pull on the bare drum, the trouble may
be in the winch.
Install a pressure gauge in the haul-in port and apply a
stall pull on the winch. If pressure is low, increase relief
valve setting until recommended pressure is obtained.
NOTE: If pressure does not increase in proportion to
adjustment, relief valve may be contaminated or worn out.
In either case, the relief valve may require disassembly or
replacement.
Remove relief valve, disassemble and clean parts thor-
oughly in a suitable solvent.
Reassemble and install relief valve. Reset pressure
according to specifications.
Check belts when pump is at full PSI (kPa) (stall pull on
winch). Tighten belts if they are found to be slipping.
Check oil level in the reservoir. Check the suction line for
damage, externally and internally. Replace suction line if
necessary.
Reinforce mounting surface.
If necessary, use steel shim stock to level winch.
First loosen, then evenly retighten all winch mounting bolts
to recommended torque.
Same as remedy for A-5.
Same as remedy for B-4
Refer to winch performance charts for additional informa-
tion.
Install a pressure gauge in the motor haul-in port and apply
a stall pull on the winch. If the pressure is up to maximum
and the bare drum line pull is less than the specified line
pull, the trouble will be in the winch.
Disassemble winch according to disassembly instructions
and check that gear train turns freely. If gear train is found
to be satisfactory, inspect the hydraulic motor, according to
the service instructions for the hydraulic motor.
TROUBLE
PROBABLE CAUSE
REMEDY
TROUBLE SHOOTING
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