C
The 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 is slipping.
System back-pressure must not exceed 100
psi (690 kPa). Inspect hydraulic system for
restriction in the circuit from the motor to the
reservoir.
Same as Remedy 3 of Trouble A3.
Improper planetary gear oil may cause the
brake clutch to slip. Drain old gear oil and
flush winch with solvent. Thoroughly drain
solvent and refill winch with recommended
planetary gear oil listed in “Preventive
Maintenance”.
Brake clutch may be damaged or worn.
Disassemble and inspect brake clutch as
described in “Brake Clutch Service”.
D
The winch will not hoist the
rated load.
1. The winch may be mounted on an uneven
or flexible surface which causes distortion
of the winch base and binding of the gear
train. Binding in the gear train will absorb
horsepower needed to hoist the rated load
and cause heat.
2. System relief valve may be set too low.
Relief valve needs adjustment or repair.
3. Be certain hydraulic system temperature
is not more than 180
°
F (82
°C)
. Excessive
hydraulic oil temperatures increase motor
and pump internal leakage and reduce
performance.
4. Winch line pull rating is based on 1st layer
of wire rope.
5. Rigging and sheaves not operating effi-
ciently.
Reinforce mounting surface.
If necessary, use shim stock to level winch.
Refer to “Winch Installation”.
First loosen, then evenly retighten all winch
mounting bolts to recommended torque.
Check relief pressure as follows:
A. Install an accurate gauge into the inlet
port of the brake valve.
B. Apply a stall pull load on the winch while
monitoring pressure.
C. Compare gauge reading to winch specifi-
cations. Adjust relief valve as required.
NOTE: If pressure does not increase in pro-
portion to adjustment, relief valve may be
contaminated or worn out. In either case, the
relief valve may require disassembly or
replacement.
Same as remedies for Trouble D1 & D2.
Same as remedies for Trouble E2.
Refer to winch performance charts for addi-
tional information.
Perform rigging service as recommended by
rig manufacturer.
TROUBLE
PROBABLE CAUSE
REMEDY
13
