9
TROUBLE SHOOTING
TROUBLE A:
CAPSTAN DRIVE WILL NOT PULL MAXIMUM LOAD.
PROBABLE CAUSE
REMEDY
1. System relief valve may be set too low
Install a pressure gauge in the haul-in port and apply
a stall pull on the capstan. 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 disas-
sembly or replacement.
2. If this trouble occurs suddenly after working at max-
imum 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 rope is increased.
Remove relief valve, disassemble and clean parts thor-
oughly in a suitable solvent. Reassemble and install relief
valve. Reset pressure according to specifications.
3. If the pump is belt driven, the belts may be
slipping.
Check belts when pump is at full PSI (kPa) (stall pull
on capstan). Tighten belts if they are found to 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.
Check oil level in the reservoir. Check the suction line
for damage, externally and internally. Replace suction
line if necessary.
5. The drive may be mounted on an uneven or flex-
ible surface which causes distortion of the 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.
Reinforce mounting surface.
If necessary, use steel shim stock to level the drive.
First loosen, then evenly retighten all drive mounting bolts
to recommended torque.
6. Be certain hydraulic system temperature is not more
than 180° F (82° C).
Excessive hydraulic oil temperatures increase
motor internal leakage and reduce motor perform-
ance.
Same as remedy for A-5.
same as remedy for B-4.
7. After all the causes listed above have been inves-
tigated and it is found that the drive will stall at max-
imum pressure without developing the maximum
pull on the capstan, the trouble may be in the drive.
Install a pressure gauge in the motor haul-in port and
apply a stall pull on the capstan. If the pressure is up
to maximum and the line pull is less than the specified
line pull, the trouble will be in the drive.
Disassemble drive 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.
