Paccar Winch BRADEN Gearmatic BG6A, Инструкция по установке, обслуживанию и ремонту

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12
TROUBLE SHOOTING
TROUBLE
PROBABLE CAUSE
REMEDY
A.
9. Rigging and sheaves not operating
efficiently.
Perform rigging and sheave service as recommended by
manufacturer.
B.
Considerable
reduction in
line speed.
1. Same as A-2.
2. Same as A-4.
3. Same as A-6.
4. If this trouble has increased gradual-
ly, the hydraulic pump or hoist motor
may be worn.
Same as remedy for A-2.
Same as remedy for A-4.
Same as remedy for A-5 & B-4.
Remove and inspect pump. If satisfactory, consult the
disassembly instructions for the hoist and remove and
inspect the motor according to the service instructions for
the hydraulic pump.
C.
Reverse
speed is
slower than
forward
speed.
1. Control valve may be restricted in its
travel.
2. Same as A-1.
3. Oil may be too thick causing a high
resistance to rotation at the brake
plates and causing the relief valve to
by-pass.
4. Same as F-1.
Check the travel of the control valve spool. The spool
travel should be the same in both directions.
Same as remedy for A-1.
Follow warm-up procedure in “Preventive Maintenance”
section.
Same remedy for F1.
D
.
Brake will
not hold
when control
valve is
returned to
neutral after
lifting a load.
1. Excessive system back pressure
acting on the brake release port.
2. Friction brake will not hold due to
worn or damaged brake disks.
Install a pressure gauge at the “pay-out” port of the
hydraulics motor. Operate the pump at full throttle and
monitor pressure in “neutral” and haul-in positions. If the
pressure is greater than 50 PSI, check for restrictions in
the return line from the hoist to the control valve and the
control valve to the reservoir.
Disassemble hoist to inspect/replace worn parts.
E.
Brake will
not control or
stop the
load when
lowering.
1. Same as D-2 or 2.
2. Hoist is being overloaded.
3. After the causes listed above have
been investigated and found to be
satisfactory, the trouble may be in
the hoist.
Same as remedy for D-1 or 2.
Install a pressure gauge at the haul-in port and apply a
stall pull on the hoist. If the pressure is higher than the
maximum specified PSI, reduce the pressure.
Disassemble the brake assembly according to the disas-
sembly instructions. Inspect the brake springs, and
brake plates.