General Machine Products 70601 Adams CD Lite Winch - Manual (Page 3)

1.03 WINCH CLUTCH GENERAL INFORMATION
The clutch provides a means of transferring the torque from the drum shaft to the winch drum. When
the winch clutch is disengaged, the drum will rotate freely on the drum shaft. Power can still be trans-
mitted through the drum shaft to the optional drum shaft extension to drive a capstan or reel, if so
equipped, while the clutch is disengaged. An air shift mechanism actuates the clutch plate in and out.
To help ascertain clutch engagement or disengagement, clutch position sensing is a standard feature.
The clutch plate position is sensed at the end of the stroke of the air cylinder actuating the clutch plate.
1.04 CALIPER TYPE, FREE SPOOL CONTROL (DRAG) BRAKE
Under rapid winch line payout conditions, it is extremely important to operate the caliper brake prop-
erly, maintaining sufficient tension on the wire rope. This will enable the level-wind assembly to oper-
ate properly, minimize over-spinning of the drum, and help to prevent erratic lays of winch line on the
drum.
All CD Lite units are factory equipped with a caliper type drag brake assembly. The caliper brake is
controlled by a hydraulic actuator (supplied), and is intended to be mounted with the winch controls.
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 together, reducing the drum speed. Continued
movement of the control lever will eventually force drum rotation to stop.
CAUTION! THE DRAG BRAKE IS USED TO CONTROL THE DRUM SPEED ONLY. IT IS NEVER
TO BE USED TO HOLD THE LOAD.
The brake assembly is mounted at the factory onto a bracket attached to the hanger on the right side of
the winch. The brake disc is mounted at the factory on the clutch end drum flange. The remote actua-
tor, reservoir, and flexible hose section are shipped loose with other winch mounting hardware in the
parts box. These components are to be installed by the dealer.
The closed circuit hydraulic system is shipped void of any fluid. Prior to operation, fill the system with
brake fluid (do not use hydraulic oil); bleed and replenish with additional fluid as required.
1.05 FULL LOAD BRAKE
The full load brake, which is mounted on the gearbox, is an automatic device designed to hold the rated
load of the winch, up to 7,400 pounds (32.9 kN) on a bare drum.
The full load brake assembly is spring loaded and requires hydraulic pressure to release the brake. The
hydraulic pressure is applied on the piston, which exerts the force on the primary disc, which com-
presses the springs into the brake housing. When the disc stack (comprising of both rotating and sta-
tionary discs) is not compressed, the rotating discs are free to turn and the brake is released. The pres-
sure to release the brake is sensed at the hydraulic motor. The pressure from either side of the motor
can release the brake. This feature enables the winch to pull in as well as power out, i.e. the brake is not
direction sensitive. Hydraulic pressure passes through a cartridge type shuttle valve diverting pressure
to release the brake as well as relieving the pressure on the brake after the system pressure is ported to
the tank.
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