Section XXII. Drum Brakes
Drum brake assemblies
General. The Conmaco Model 270 two drum winch has a brake attached to each drum mechanism. The brakes
are band type that are applied around the exterior surface of the cylindrical brake drum welded to the cable drum flange.
Figure 5-44 is a schematic of the right side of the cable drum showing the location and size of the brake drum flange.
Drum Brake Assembly Removal
Front and rear drum brake assemblies are identical except that certain brake band hardware is located
Maintenance procedures will be performed facing the engine end of the winch toward the drums.
Removal, inspection, repair and installation instructions in this section will apply to either drum brake.
Where procedure is different for front drum, it will be addressed as a note.
Brake Band Removal
Ensure that area around winch brakes is clean and remove brake drum dust cover.
Wear eye protection when using compressed air or serious eye injury could result.
Use compressed air and blow loose brake dust out of brake and clutch drums.
Inspect brake bands and brake drum for an out of round condition. Check individual pads for excessive
wear. Note any discrepancies.
If normal air pressure is not available from the winch air tank ensure that the source air pressure is
between 90-125 psi. Air pressure below 90 psi may not release the brake; excess pressure could
damage the air actuator.
Apply air pressure to release parking brake.
Loosen and remove adjusting bolts and shims between live and dead brake bands (Figure 5-45).