3.9.3 Stability. The scraper shall negotiate 35 percent side slopes empty, 20
percent side slopes loaded, and descend 40 percent longitudinal slopes loaded
without any wheel of the scraper losing contact with the ground. All parts
requiring lubrication shall be lubricated when the scraper is operating under
3.9.4 Fording. The scraper shall start and operate during and after fording
operations in fresh water to any depth up to 20 inches including wave action
without damage and without leakage of water into reservoirs containing
3.10 Engine. The diesel engine shall meet the requirements of MIL-STD-1410
for application in a class II end item. The engine shall be the engine
furnished commercially including all systems, components, accessories, and
auxiliaries. The engine shall be equipped with a muffler. The exhaust stack
shall be equipped with a rain cap or shall be fabricated and mounted to prevent
the entry of rain or snow.
3.10.1 Engine horsepower. The applied net horsepower of the engine at the
flywheel when measured in accordance with SAE J816 shall be not less than 150
3.10.2 Engine cooling system. The contractor's standard or optional cooling
system meeting the requirements of 3.9.1 shall be provided.
3.10.3 Fuel tank. The fuel tank shall be of a type regularly furnished as
standard equipment with a capacity for 10 hours of continuous normal operation.
The tank shall be equipped with a means for draining water and sediment from the
bottom of the tank.
3.10.4 Air compressor. An engine driven air compressor shall be furnished to
provide air for the brake system (when equipped with air brake system) and for
water distributor nozzle actuation. In addition to the air compressor, an air
reservoir with safety valve, and the lines and fittings required for water
distributor operation shall be provided on all tractors to accommodate the inter-
changeability requirement of paragraph 3.1. A service outlet with hose and
fittings necessary for tire inflation shall be provided with the air system.
3.11 Drive train. A drive train consisting of a torque converter, full
powershift transmission, front drive axle with differential and planetary final
drives, and all necessary connecting components shall be furnished. The
transmission shall provide not less than four forward speeds and one reverse
speed. A locking or limited-slip differential shall be furnished in the drive
3,12 Wheels and tires. Commercial standard remountable wheels or rims shall
be provided. Traction type tubeless tires shall be furnished and shall have a
tread pattern suitable for scraper operation. The contractor's standard tire
size and ply rating shall be furnished.