49
This procedure applies in general terms to standard hoists with Commercial Intertech gear motors. For
information concerning hoists with other types of motors, consult the BRADEN Service Department at
the phone number listed in the FOREWORD section of this manual.
REVERSING DIRECTION OF DRUM ROTATION
In order to change the direction of drum rotation, 2 things 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 rota-
tion. This is done by reversing the brake clutch.
Figures “A” and “B” above show typical motor installations. Note that the only difference between the two draw-
ings is the motor is rotated 180° (the “belly” of the motor moves to the opposite side). If the motor shaft in figure
“A” rotates clockwise when the hoisting port is pressurized, the motor shaft in figure “B” will rotate counterclock-
wise.
1. Stand the hoist up on the motor support with the
motor up and secure in this position. 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 installa-
tions have the brake release hose connected direct-
ly to the motor, instead of to the manifold block as
shown above. In these cases, disconnect the brake
release hose from the motor.
2. Before removing the motor, it is a good idea to mark
the position of the motor in relation to the hoist, since
it will be rotated 180° when re-installed. Remove the
capscrews securing the motor to the hoist and care-
fully remove the motor.
3. Remove the brake clutch assembly from the hoist.
Carefully inspect the splines on both ends of the
inner race.
a. If they are the same, the entire brake clutch
assembly can be turned over and re-installed in the
hoist.
Before installing the brake clutch, be sure
the inner race turns free in the same direction
the drum will turn to haul-in wire rope.
An easy
way to check the rotation is to hold the outer race in
one hand and rotate the inner race. Proceed to step
8.
b.
If the splines in each end of the inner race are
not the same, proceed to step 4.
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 entire
brake clutch assembly must be replaced.
Hydraulic
Motor
Brake
Valve
Br
Drn
Brake Release Circuit
M
Lowering
Port
Hoisting
Port
Motor Case Drain
“A”
Hydraulic
Motor
M
Lowering
Port
Brake Release Circuit
Brake
Valve
Br
Drn
Hoisting
Port
Motor Case Drain
M = Manifold Block
