HOIST AND COUNTERWEIGHT RT9130E-2 SERVICE MANUAL
5-4 Published 11-22-2016, Control # 345-12
2. Oil leaks from vent plug a. Same as 1b a. Same as 1b
b. Motor seal may be defective
as a result of high system
back pressure or
contaminated oil.
b. System back pressure must
not exceed 150 psi. Inspect
hydraulic system for a
restriction in the return line
from the control valve to the
reservoir. Make sure control
valve and plumbing is
properly sized to hoist motor.
Oil analysis may indicate
contamination has worn motor
shaft and seal. Thoroughly
flush entire hydraulic system
and install new filters and oil.
Install new motor seal.
3. The brake will not hold a load with
the control lever in neutral.
a. Excessive system back
pressure acting on the brake
release port.
a. Same as 2b
b. Friction brake will not hold due
to worn or damaged brake
discs.
b. Same as 1c
c. Brake clutch is slipping. Improper planetary gear oil
may cause the brake clutch to
slip. Drain old gear oil and
flush hoist with solvent.
Thoroughly drain solvent and
refill hoist with recommended
planetary gear oil. Refer to
Lubrication, page 9-1.
Brake clutch may be
damaged or worn.
Disassemble and inspect
brake clutch assembly. If any
parts require replacement, the
entire clutch assembly must
be replaced.
4. The hoist will not raise the rated
load.
a. The hoist may be mounted
unevenly which causes
distortion of the hoist base
and binding of the gear train.
Binding in the gear train will
absorb horsepower needed to
raise the rated load and cause
heat.
a. Use shim to level the hoist.
Refer to Hoist Installation in
this section.
b. System relief valve may be
set too low.
b. Check relief pressure. Refer
to Pressure Setting
Procedures, page 2-21.
Symptom Probable Cause Solution
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