Reversing Direction Of Drum Rotation - BRADEN PD12C Series Installation Maintenance And Service Manual

REVERSING DIRECTION OF DRUM ROTATION

Motor
Case Drain
DRN
Brake
Valve
BR
Hoisting
Port
Brake Release
Circuit
In order to change the direction of rotation and brake operation, 2 components must be changed on the hoist. First,
the motor must be made to rotate in the opposite direction. This is done by exchanging positions of the brake valve
and manifold block on the motor. Secondly, the brake clutch assembly must be made effective for the opposite
direction of rotation. This is done by reversing the inner race of the brake clutch assembly.
Figures "A" and "B" above show typical PD12C motor installations. Note that the only difference between the two
drawings is the motor is rotated 180° (the "belly" of the motor moves to the opposite side). If the motor shaft rotates
clockwise in fi gure 'A" when the hoisting port is pressurized, it will rotate counterclockwise in fi gure "B".
1. Remove the four capscrews securing the brake valve
to the motor. Remove the four capscrews secur-
ing the manifold block to the motor. Disconnect the
motor case drain hose at the motor. NOTE: Some
installations have the brake release hose connected
directly to the motor, instead of to the manifold block.
In this case, disconnect the brake release hose at
the motor port. Stand hoist up on drum support with
the motor end up and secure in this position.
2. Before removing the motor, it is a good idea to note
or mark the position of the motor in relation to the
hoist, since it will be rotated 180° when reinstalled.
Remove the capscrews securing the motor to the
hoist and carefully remove the motor.
3. Remove the brake clutch assembly from the motor
support.
Lowering
M
Motor
Port
M = Manifold Block
"A"
Motor
Case Drain
DRN
Brake
Motor
Valve
BR
Hoisting
Port
Brake Release
Circuit
"B"
4. Remove the snap ring and sprag bushing retainer
from one end only of the brake clutch assembly.
5. Pull the inner race out. Examine the race for scor-
ing, wear or indentations caused by the sprag cams.
If the inner race is not completely smooth, the as-
sembly should be replaced.
34
Lowering
M
Port