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Combination step plate and gravel guard |
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|  MIL-T-45380E(AT)
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3.4.22.2 Front bumper. When a front mounted winch is specified (see 3.4.22), 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
(see 3.4.15), or a pipe type front bumper. When a pipe type front bumper is furnished the
nominal diameter shall be not less than 3 inches, and the wall thickness shall be not less than that
specified in Schedule 40 of ASTM A53. 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 (0.0747 inch) steel tread plate exclusive of projections. The
step plate shall be secured to the front bumper and shall be not less than 0.250 inch and not
greater than 0.375 inch from the chassis sheet metal. The step plate shall be capable of
supporting 300 pounds per square foot. The step plate shall not deflect more than 0.125 inch
under the loads imposed.
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3.4.23 Engine hour meter. When specified (see 6.2), an engine hour meter shall be
furnished. The meter shall have a totalizing mechanism of not less than 9,999 hours for the
chassis engine to register accurately the number of hours of operating time. The meter shall be
of rugged construction to ensure continuous trouble-free performance under severe operating
conditions. The engine hour meter shall be mounted on the cab instrument panel or in the engine
compartment in a readable location.
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3.4.24 Back-up alarm. When specified (see 6.2), the vehicle shall be provided with an
audible, pulsating, signaling device (electric or mechanical) to caution personnel when the
vehicle is in reverse gear operation.
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3.4.25 AM/FM radio. When specified (see 6.2), the manufacturer's standard AM/FM
radio shall be provided.
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3.5 Earth auger unit. The earth auger unit shall be self-contained, turntable mounted
unit, consisting of an auxiliary engine, hydrostatic drive system, boring assembly, pole setting
equipment, augers, and self-contained winch mounted on the curbside of the truck. The main
frame shall include a right angle drive trunnion support for extra strength and extend the life of
right angle drive/final drive.
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3.5.1 Auxiliary engine. An auxiliary engine to drive the hydraulic pump shall be
furnished. The auxiliary engine shall operate on the same type of fuel as the truck chassis
engine. The auxiliary engine fuel supply shall be from the auxiliary engine fuel tank, located
streetside on the turntable. The engine shall be mounted on the body platform in conjunction
with the hydraulic pump. The engine mounting shall minimize the transfer of vibration. The
engine shall be capable of being operated from a remote position (see 3.5.7). The auxiliary
engine shall have sufficient output power to drive all operating components other than the
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