5-10
Published 9-04-2014, Control # 422-08
HOIST AND COUNTERWEIGHT RT765E-2 SERVICE MANUAL
MOTOR AND BRAKE
Description
Each hoist has a hydraulic motor, a brake valve, a brake
cylinder, and a brake clutch which control motion of the
hoist’s drum. These parts mount on one of the support end
brackets of the hoist. The hydraulic motor connects to the
hoist’s brake clutch, which in turn connects to the gear train
of the hoist.
Maintenance
Removal
1. Drain the oil from the hoist drum by removing the plugs.
Reinstall the plugs when the drum is finished draining.
2. Power-wash the hoist on the motor side to wash away
potential contaminants from the drive components of the
hoist.
3. Tag and disconnect the hydraulic lines from the motor
and the brake valve. Cap or plug all lines and openings.
4. Remove the two bolts and washers to free the motor and
brake valve from the brake cylinder and brake clutch on
the support end bracket. Remove the motor and brake
valve as a unit. Discard the O-ring.
5. Cover the motor opening in the brake cylinder to protect
drive components inside the hoist drum. As needed,
secure the brake clutch from inside the brake cylinder.
Installation
NOTE: Assure the primary thrust plate remains properly
located in its counterbore when installing the motor.
If operating the hoist with the primary thrust plate
wedged between the primary gears and the planet
carrier, or with a thrust washer out of position
severe damage to internal hoist parts could result.
1. Uncover the motor opening in the brake cylinder. Verify
the brake clutch is secure in the brake cylinder. Verify
these parts are clean.
2. Install a replacement O-ring on the motor’s pilot after
lubricating it with gear oil or petroleum jelly.
3. Engage the motor shaft to the inner race of the brake
clutch when installing the motor and attached brake
valve. Apply Loctite No. 243 to the bolts for the motor.
Secure the motor and brake valve to the brake cylinder
with bolts and washers. Torque bolts to 282 lb-ft
(382 Nm).
4. Connect the hydraulic lines to the motor and brake valve
as tagged during removal.
5. Fill the drum with oil. Refer to Lubrication, page 9-1 in
this manual.
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