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Combination step plate and gravel guard |
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|  MIL-T-62518A
3.4.22.1 Winch drum guard. A winch drum guard shall be furnished. The guard shall
confine the cable to the area between the drum flanges. The guard shall consist of not less than
6.4 mm (0.25 inch) vertical side plates, conforming to the outside radius of the drum flanges.
Six bars, 9.5 mm (0.375 inch) by 32 mm (1.25 inches), shall be welded to the vertical side plates.
Three bars shall be located on the top and spaced equally on the top radius, and three bars shall
be located on the bottom and spaced equally on the bottom radius. The vertical distance between
the vertical side plates and the flanges shall be not more than one-half the specified cable
diameter.
3.4.22.2 Front bumper. When a front mounted winch is specified, the bumper shall be
mounted forward of the winch. The open area on either side of the winch shall be covered with a
combination step plate and gravel guard. The bumper shall be either a channel or pipe type.
When a pipe type front bumper is furnished, the nominal diameter shall be not less than 75 mm
(3 inches), and shall have a wall thickness of not less than that specified in Schedule 40 of
ASTM A 53. The pipe type front bumper shall have half-round ball ends.
* 3.4.22.3 Combination step plate and gravel guard. When a front mounted winch is specified,
a combination step plate and gravel guard shall be furnished. The step plate shall be fabricated
of not less than 14 gage (1.897 mm) (0.0747 inch) steel tread plate exclusive of the projections.
The step plate shall be secured to the front bumper and shall be not less than 6.4 mm (0.25 inch)
or not more than 9.5 mm (0.375 inch) from the chassis sheet metal. Rubber flaps may be
employed to achieve these dimensions and shall be furnished when required by tilting
hood/fender vehicles for unrestricted tilting. The step plate shall be capable of supporting
1460 kg/m2 (300 pounds per square foot). The step plate shall deflect not more than 3.2 mm
(0.125 inch) under the loads imposed.
3.4.22.4 Winch reel. A reel for payout and take-up shall be provided when a front mounted
winch is furnished. The reel shall be designed to operate from the end of the extended winch
shaft. Reel yokes shall be controlled by a handle at the end of the reel shaft. The spindle shall
be fitted with a bayonet type socket for attachment to the shaft. Reel spiders and yokes shall be
made from heat treated aluminum. The inside diameter of the coil shall be approximately
510 mm (20 inches), the maximum outside diameter approximately 710 mm (28 inches), and the
thickness or width of the coil approximately 150 (6) to 230 mm (9 inches).
* 3.4.23 Servicing and adjusting. Prior to acceptance of the vehicle by the Government
inspector, the contractor shall service and adjust each vehicle and its mounted equipment for
operational use including at least the following: alinement of lights; adjustment of engine;
adjustment of brake system; filling and charging of batteries; alinement of front wheels; inflation
of all tires; complete lubrication of chassis, engine, running gear, and mounted equipment with
grades of lubricants recommended for the ambient air temperature at the delivery point; servicing
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