Reversing Direction Of Drum Rotation - BRADEN CH SERIES Installation Maintenance And Service Manual

REVERSING DIRECTION OF DRUM ROTATION

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.
Drn
Brake
"A"
Valve
Br
Hoisting
Port
Brake Release Circuit
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 driection of rotation. 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 drawings is
the motor is rotated 180 o (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 counterclockwise.
1. Stand the hoist up on the motor support with the motor
up and secure in this position. Remove the four cap-
screws 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 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 rotatled 180 o when re-installed. Remove the
capscrews securing the motor to the hoist and careful-
ly 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.
Motor Case Drain
Lowering
Port
Hydraulic
Motor
M
M = Manifold Block
Motor Case Drain
Drn
Brake
"B"
Valve
Br
Hoisting
Port
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 scoring,
wear or indentations caused by the sprag cams. If the
inner race is not completely smooth, the entire brake
clutch assembly must be replaced.
34
Hydraulic
M
Motor
Brake Release Circuit
Lowering
Port