Paccar Braden PD12C - Reversing Direction of Drum Rotation

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REVERSING DIRECTION OF DRUM ROTATION
Motor
Case Drain
Brake Release
Circuit
Brake Release
Circuit
Hoisting
Port
Motor
Case Drain
Motor
Brake
Valve
M
Lowering
Port
DRN
DRN
BR
BR
Hoisting
Port
Lowering
Port
Motor
Brake
Valve
M
M = Manifold Block
“A”
“B”
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 e󰀨ective 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. The only di󰀨erence 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 gure
‘A” when the hoisting port is pressurized, it will rotate counterclockwise in gure “B.”
1. Remove the four capscrews securing the brake valve
to the motor. Remove the four capscrews securing 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.
4. Remove the snap ring and sprag bushing retainer from
one end only of the brake clutch assembly.