TM 55-1930-209-14&P-213-11. Front and rear winch drum brake adjustmenta.General. The front and rear winch drums are equipped with band brakes, controlled by air pressure fromoperator's console. The leading dead end of band is connected to hoist bed and lagging end is connected to brakeactuating arm. Each brake band is set for parking by a spring inside the air chamber connected to brake arm. Airpressure is required to compress spring and release parking brake. Parking brake is set even if air pressure is lost. Thesecond part of the chamber uses air pressure to operate the same piston to move actuating arm and apply brake. Thisarrangement allows for smooth brake applications during winching operations.b.Adjustment.(1)Open front and rear drum brake band covers as illustrated in figure 3-6.(2)Inspect brake bands for out-of-round condition, uneven pad wear, and contact over at least 85% of drumsurface. If brake band fails this visual inspection, refer problem to your supervisor as brake repair may be required.(3)Refer to figure 3-7; apply and release brakes and measure crank travel from released to set position. Ifcrank travel approaches 2 inches, brake requires adjustment.Figure 3-6. Front and Rear Brake Drum Covers.3-15
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