5-6
Published 01-29-2014, Control # 496-00
HOIST AND COUNTERWEIGHT TMS800E SERVICE MANUAL
PISTON MOTOR AND CONTROL VALVE
Description
The piston motor is a bent axis, bidirectional, variable
displacement heavy-duty motor. The motor is bolted to the
hoist and is geared directly to the hoist planetary.
The motor control valve is bolted to the motor.
Maintenance
Removal
NOTE: The motor weighs approximately 48.8 kg
(107.6 lb).
1. Thoroughly clean the external surfaces of the drum and
motor with steam or clean solvent and blow dry.
2. Tag and disconnect the hydraulic lines connected to the
hoist motor and the motor control valve.
3. Remove the capscrews and lockwashers that secures
the motor and motor control valve to the hoist.
4. Place the motor and motor control valve in a clean, dry
suitable work area.
Installation
NOTE: Care must be taken to assure the primary thrust
plate remains properly located in its counterbore
when the motor is re-installed. If the hoist is
operated 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 components could result.
1. Install a new O-ring on the motor pilot then lubricate with
petroleum jelly or gear oil. Engage the motor shaft with
the brake clutch inner race and lower into place.
2. Apply Loctite® No. 243 to the mounting capscrews, and
install the capscrews and lockwashers. Tighten the
capscrews, refer to Fasteners and Torque Values, page
1-13.
3. Connect the hydraulic lines as tagged during removal.
4. Fill the drum with oil. Refer to Lubrication, page 9-1 in
this manual.
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