25
B
Oil leaks from the vent
plug.
1. Same as A2.
2. The hydraulic motor shaft seal may be
defective as a result of high system
back pressure or contaminated
hydraulic fluid.
3. Same as A4.
Same as A2.
System back pressure must not exceed
150 PSI (1,035 kPa). Inspect the
hydraulic system for a restriction in the
return line from the control valve to the
reservoir. Be sure the control valve and
lines are properly sized to the hoist
motor.
Oil analysis may indicate contamination
has worn the motor shaft and seal.
Thoroughly flush the entire hydraulic
system and install new filters and oil.
Install new motor shaft seal.
Same as A4.
C
The brake will not hold a
load with the control
lever in neutral.
1. Excessive system back pressure may
be present and acting on the hoist
brake release port and/or the ABS
brake port.
2. The static friction brake will not hold
due to worn or damaged brake discs.
3. The over-running brake clutch may be
slipping.
4. Same as A5.
Same as B2.
Same as A3.
Improper planetary gear oil can cause
the brake clutch to slip. Drain the exist-
ing gear oil and flush the hoist with sol-
vent. Thoroughly drain the solvent and
refill the hoist using the recommended
planetary gear oil defined in "Preventive
Maintenance".
The brake clutch may be damaged or
worn. Disassemble and inspect the
brake clutch assembly as described in
"Brake Clutch Service".
Same as A5.
D
The hoist will not raise
the rated load.
1. The hoist may be mounted on an
uneven or flexible surface which can
cause distortion of the hoist base
and/or binding of the hoist gear train.
Binding in the gear train will reduce
available horsepower to the hoist and
create heat.
Reinforce the mounting surface.
If necessary, use shim stock to level the
hoist. Refer to "Installation".
First loosen, then, evenly retighten all
hoist mounting fasteners to the recom-
mended torque.
TROUBLE
PROBABLE CAUSE
REMEDY