MIL-DTL-62027K
4.6.5.5 Turning ability. To determine conformance to 3.4.3, the dolly set, when fully
loaded (see 6.1.1) and coupled to the towing vehicle, shall be operated at the towing vehicle's
minimum turning circle, to the right and to the left. Not less than two complete circles shall be
conducted. The dolly set shall meet the performance requirements specified.
4.6.5.6 Brake system. To determine conformance to 3.4.4, the dolly set air reservoir shall
be charged with air to 689 + 34 kPa and the air supply line disconnected, apply brakes on all
wheels of the dolly set. the brake system shall be observed for performance requirements.
4.6.5.6.1 Service brakes. To determine conformance to 3.4.4.1, with the dolly set loaded
with rated payload, the service brakes of the towing vehicle and dolly set shall be applied for
stopping while traveling forward at a speed of 32 km/h on a dry, relatively smooth, level, hard-
surfaced road free of loose material. The speed and stopping distance shall be measured.
4.6.5.6.2 Parking brake. To determine conformance to 3.4.4.2, the dolly set, standing on
the specified grade, shall be uncoupled from the towing vehicle and headed up or down grade
with the dolly set parking brake applied, and the brakes shall hold as specified. Caution shall be
observed to assure the safety of personnel and equipment when performing this test. Safety
measures, such as chock blocks placed at the dolly set wheels when an uncoupling operation is
performed should be used. The test may also be safely conducted in the coupled position by
easing the towing vehicle forward, or rearward enough to allow the dolly set lunette to relax
(loosen) in the pintle hook. The lunette continuing to remain loose is an indication that the brakes
have held.
4.6.5.6.3 Automatic actuation. To determine conformance to 3.4.4.3, the dolly set and
the towing vehicle shall be placed on the specified grade and the breakaway device actuated.
Brake holding is as specified if, during the time specified, the brakes remain in the locked position
when the towing vehicle attempts to pull the dolly set, and the wheels on the dolly set will not
roll. Caution shall be observed to assure safety of personnel and equipment when performing this
test.
4.6.5.7 Towing. To determine conformance to 3.4.5, the dolly set loaded with rated
payload shall be towed by a 4.53 metric ton M54 prime mover, when the combination is operated
in a straight line or a level, smooth paved surface, the dolly set shall be observed for performance
requirements.
4.6.5.8 Fording. To determine conformance to 3.4.6, the dolly set shall be loaded with
rated payload, operated in water of the depth and for the time specified, and subsequently
examined for damage. Any evidence of damage, special preparation, or servicing required before
or after fording shall be cause for failure.
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