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MIL-T-11663K
3.5.3 Hydraulic systems. The hoist-haul units shall be hydraulically operated. Power shall
be transmitted from a transmission mounted power takeoff through a heavy duty gear or vane
type pump. The normal operating pressure range shall be between 900 pounds per square inch
(psi) and 1600 psi. Relief valves shall be incorporated into the hydraulic system to prevent
excessive pressure. A line tap shall be provided so that a pressure gage may be installed to
periodically check relief pressure. All hydraulic lines, hoses, and fittings shall meet or exceed the
requirements of SAE recommended practices and standards. The size, volumetric capacity, and
pressure rating of all components shall be such as to assure a smooth and efficient operation of the
system.
*  3.5.3.1 Hydraulic fluid. Unless otherwise specified, the manufacturer's standard or
recommended hydraulic fluid shall be provided in the hydraulic system. When specified (see 6.2),
hydraulic fluid conforming to MIL-H-83282 shall be provided in the hydraulic system. A
permanent decal located near the hydraulic system fill port shall be furnished stating "CAUTION:
USE HYDRAULIC FLUID CONFORMING TO MIL-H-83282 ONLY."
*  3.5.3.2 Hydraulic cylinders. All hydraulic cylinders shall be fitted with seals to prevent
entrance of dirt, moisture, and other foreign elements and to preclude leakage of hydraulic fluid
from the cylinders. Hydraulic piston rods shall be chrome-plated full length with sufficient
thickness to withstand a 30-hour salt spray test in accordance with ASTM Designation B117.
The connecting ends shall be treated in accordance with the best commercial practice.
3.5.3.2.1 Type I cylinders. Two vertical cylinders shall be provided to control the elevating
and lowering of the boom arms. One horizontal cylinder shall be provided to control the forward
and rearward movement of the carriage for container pickup, moving the container into travel
position, and moving the container into position for dumping refuse.
3.5.3.2.2 Type II cylinders. One single-acting cylinder shall be provided to control lifting
and lowering of the forks, two double-acting cylinders to control the dumping action, and one
double-acting cylinder to control the tilting action of the carriage.
3.5.4 Lubrication. All moving parts and surfaces of the equipment normally requiring
lubrication shall be provided with lubrication fittings of the hydraulic type with surface check ball
and, when applied to sealed bearings, shall have pressure release to protect the seals.
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