General Machine Products CD-28 Adams Manual - Manual (Page 5)

5
DISC TYPE DRAG
BRAKE On units manufactured before February 15, 1980, there are three control
positions for the winch clutch and disc type drag brake. Using the mechanical push-
pull shift, with the control lever installed at the rear of the vehicle, operation is as
follows:
Control handle all the way in - clutch engaged for pulling.
Control handle partially out - clutch disengaged for free spool operation.
Control handle all the way out and holding - applies drag brake to drum.
The winch clutch consists of a clutch plate, brake lining, detent sleeve and shifter
fork. Teeth in the clutch plate match similar teeth in the drum flange. The clutch
plate is faced with a brake lining. The detent sleeve slides on the hub of the clutch
plate to release the detent, locking the clutch assembly in the clutch engaged posi-
tion. The winch is now ready to pull.
Continued movement of the control lever to the rear moves the clutch assembly
toward the drum, disengaging the meshed clutch teeth. The drum is now disen-
gaged and can rotate freely. The clutch will remain disengaged until the control
lever is again moved. The winch is now ready for free spool operation.
Application of the disc type drag brake is accomplished by moving the clutch plate
toward the drum to the limit of its travel. This action is normally achieved by pull-
ing the control lever rearward, forcing the clutch plate brake lining into the ma-
chined surface of the drum flange.
Pressure between the brake lining and the drum must be maintained to keep the
brake on. Or, the amount of braking is in direct proportion to the amount of pull
exerted.
Release of the control handle allows a coiled spring to push the brake plate away
from the drum into the pull position.
BAND TYPE DRAG
BRAKE Units manufactured between February 15, 1980 and July 31, 1991 incorporate a
band type drag brake.
This brake, mounted on the outside hub of the right hand drum flange, is com-
pletely separate from the clutch assembly. Using the mechanical push-pull method
of control, the handle is located at the rear to the right of the clutch control. Pulling
the control handle will slow down or stop the drum rotation.
When designing the drag brake control handle, be sure to specify a straight push-
pull type and not an overcenter type. This will prevent the operator from setting the
brake and using it to hold the load.
CALIPER TYPE
DRAG BRAKE Winch assemblies manufactured after August 1, 1991 will include the caliper
brake. The assembly shown on parts drawing 230-1970 includes:
1-Brake Assembly, Caliper P/N 17134
1-Bracket, Brake Mounting 15277
1-Actuator Assembly 17135
1-Reservoir 17136
1-Flexible Hose 17137
1-Disc, Brake 24117
The purpose of the caliper brake is to control the speed of the winch drum when in
the free spool mode. Movement of the actuator lever will force the brake pads to-
gether, reducing the drum speed. Continued movement of the control lever will
eventually force drum rotation to stop.