MIL-DTL-62267B(AT)
reverse gear, and when chassis is being operated on 30% side slopes with either side of chassis up
slope (see 4.5.4.7).
3.4.7.3 Holding. With the chassis standing on a 60% grade, with service brakes applied,
the chassis shall be held stationary when headed either up or down grade. With parking brake
engaged and all other holding devices inoperative, the chassis shall be held stationary when
headed either up or down grade (see 4.5.4.7).
3.4.7.4 Grade speeds. The chassis shall operate at a sustained speed of 10 mph (16 km/h)
while ascending a 10% grade and at 20 mph (32 km/h) while ascending a 3% grade (see 4.5.4.7).
3.4.8 Shallow water fording. Chassis shall ford a level, hard-bottom body of water
48 inch (in.) (1220 millimeter (mm)) in depth, including wave, without special equipment. With
the chassis standing in water 48 in. (1220 mm) in depth for 30 minutes, the accumulation of water
shall be not more than 1.5 in. on the crew compartment hull floor measured in the center of the
"V" (see 4.5.4.8).
3.4.8.1 Engine starting (shallow water). With the chassis standing for 30 minutes in
water 48 in. (1220 mm) in depth, the engine operating at 1000 rpm for 15 minutes, then stopped
for 15 minutes, the engine shall restart in not more than 3 minutes. All accessories shall function
satisfactorily during and after fording operations (see 4.5.4.8.1).
3.4.8.2 Lubricant contamination. After fording operations, the water content of the
transmission, engine, final drives, and suspension system lubricants shall be not more than 2% by
volume (see 4.5.4.8.2).
3.4.9 Trench crossing. The chassis shall cross trenches 36 in. (915 mm) in depth and
102 in. (2590 mm) in width without stalling or damage to suspension and other vehicle equipment
(see 4.5.4.9).
3.4.10 Vertical obstacles. The chassis shall cross over vertical obstacles 36 in. (915 mm)
in height while moving forward without stalling or damage to suspension and hull floor, speed not
to exceed 5 mph (8 km/h) (see 4.5.4.10).
3.4.11 Turning. The chassis shall turn 360° to the right and left in pivot, in neutral steer,
within a circle 35 ft (10.7 m) in diameter (see 4.5.4. 11).
3.4.12 Sealing. Except as specified in 3.4.8, all seals and sealer shall prevent the entrance
of water and foreign matter under all operating conditions. Static seals shall provide an
interference fit of sealing surfaces preventing the leakage of fluids intended to be contained by the
seals. Dynamic seals shall prevent fluid leakage in the form of a drop (see 6.5) when the chassis is
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