15
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.
Same as remedy for Trouble B2.
Same as remedy for Trouble A2.
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 Main-
tenance.”
Brake clutch may be damaged or worn. Dis-
assemble and inspect brake clutch as de-
scribed in “Brake Clutch Service.”
D
The winch will not hoist the
rated load.
1. The winch may be mounted on an un-
even or flexible surface which causes
distortion of the winch base and bind-
ing 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 re-
pair.
3. Be certain hydraulic system tempera-
ture is not more than 180°F (82°C).
Excessive hydraulic oil temperatures
increase motor internal leakage and re-
duce motor performance.
4. Winch line pull rating is based on 1st
layer of wire rope.
5. Rigging and sheaves not operating ef-
ficiently.
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 0-4000 PSI (28,000
kPa) 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 and D2.
Same as remedies for Trouble E2.
Refer to winch performance charts for ad-
ditional information.
Perform rigging service as recommended by
crane manufacturer.
TROUBLE
PROBABLE CAUSE
REMEDY
Summary of Contents for CH330
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