A-A-52512
2.5 Motor. The air driven motor shall have high starting torque. The motor shall be reversible and shall be complete with combined throttle and reverse valve, lubricator, and governor. The motor shall be air-enclosed to exclude dust and dirt. The throttle valve shall be operated and controlled at the mounted lever. The throttle shall be labeled “THROTTLE” and “FAST” and “SLOW" at the respective control locations. Normal air pressure for operating the motor shall be 80 psi. The motor shall have a 1-inch pipe connection for inlet air supply.
2.6 Clutch. The clutch shall be designed to slip and hold any cable load up to 2,000 pounds or regulate the speed of the cable drum so that it will reel in or play out cable at any speed between 0 and 36 rpm under the load specified herein. When playing out cable under load with power removed born the winch, the clutch shall fiction as a brake and shall regulate the dragon the cable drum and the cable speed. This braking function shall also enable the operator to hold any load up to 2000 pounds without power to the winch. The clutch shall also incorporate a deadman brake capable of holding any load up to 2000 pounds with or without power applied to the winch. The dead-man brake shall be so designed that when the clutch control lever is released by the operator, the brake shall be automatically actuated.
2.7 Clutch control. The single clutch-control lever shall be conveniently located on the winch in such a manner as to facilitate ease of operation. The force required to operate the clutch-control lever shall not exceed 20 pounds with any line load up to 2,000 pounds. The clutch control shall be so designed that when the winch operator releases the lever, the dead-man brake will be actuated. The clutch control shall be labeled “CLUTCH” above the lever with 0.25 inch minimum letter height. The clutch lever control positions shall be labeled “ON” and “RELEASE” adjacent to the appropriate control locations with 0.18 inch minimum letter height.
2.8 Brake. The brake shall be of the external contracting (band) type and shall be accessible for inspection and adjustment. The brake shall be operated by a lever located on the winch within reach of the operator. The brake shall stop and hold a 2,000 pound rated load in any position with the drum spooled to capacity with cable. In addition a positive locking pawl and ratchet arrangement shall be provided for holding loads. The brake lever control shall be labeled “brake” with 0.25 inch minimum letter height.
2.9 Winch drum and wire rope. The winch drum flanges, and braking surfaces shall be accurately machined to provide for intended performance and cable protection. The winch drum shall have a capacity of not less than 350 feet of 1/2 inch wire rope. A 350-foot length of 1/2 inch, uncoated, regular lay, preformed wire rope rated at 14500 pound minimum breaking strength, shall be furnished wound on the drum. A forged steel swivel-hook with a minimum clear opening of 1/2 inch shall be furnished fastened to the free end of the wire rope by means of a steel thimble and four wire-rope clamps. The swivel-hook shall be accurately machined at the swivel-hook bearing surface to permit smooth operation.
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