11
A.
Hoist will not
pull maxi-
mum 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 sys-
tem relief valve, holding it partially
open. If this is the cause, a consid-
erable 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 hoist may be mounted on an
uneven or flexible surface which
causes distortion of the hoist 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 temper-
ature is not more than 180
o
F (82
o
C).
Excessive hydraulic oil temperatures
increase motor internal leakage and
reduce motor performance.
7. Hoist line pull rating is based on 1st
layer of wire rope. Expected line pull
may be in excess of hoist rating.
8. After all the causes listed above
have been investigated and it is
found that the hoist will stall at maxi-
mum pressure without developing
the maximum pull on the bare drum,
the trouble may be in the hoist.
Install a pressure gauge in the haul-in port and apply a
stall pull on the hoist. 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 disassem-
bly 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 (kg/cm
2
) (stall pull
on hoist). 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 hoist.
First loosen, then evenly retighten all hoist mounting bolts
to recommended torque.
Same as remedy for A-5.
Same as remedy for B-4
Refer to hoist performance charts for additional informa-
tion.
Install a pressure gauge in the motor haul-in port and
apply a stall pull on the hoist. If the pressure is up to max-
imum and the bare drum line pull is less than the speci-
fied line pull, the trouble will be in the hoist.
Disassemble hoist 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
Summary of Contents for BRADEN Gearmatic BG6A
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