MIL-PRF-83766B
3.7.1 Reservoir. A hydraulic fluid reservoir, in accordance with Air Force Drawing 65J34010,
shall be furnished as an integral part of the filler and pressurization unit. The reservoir material
shall be fabricated from stainless steel.
3.7.2 High pressure pump. A high pressure, hand operated, double acting pump shall be
installed in the system to pump hydraulic fluid from reservoir to service line. This pump shall be
in accordance with Class 3000 of MIL-P-5515 and AN6248, maximum pressure 3,000 psi.
3.7.3 Low pressure pump. A low pressure, hand operated double acting pump shall be
installed in the system to pump hydraulic fluid from the reservoir to service line. The pump shall
be capable of delivering a minimum capacity of 2 gallons per 30-35 strokes (complete cycles).
The mechanical advantage of this pump shall be such that a maximum force of 30 pounds on the
pump handle (17-20 inches in length measured from the center of the pump shaft to end of the
handle) shall produce the rated flow, maximum pressure 100 psi.
3.7.4 Relief valves. Pressure relief valves shall be incorporated in the unit to protect the
hydraulic system of the aircraft being serviced and the filler unit. When open, the relief valves
shall pass the hydraulic fluid back to the reservoir. The pressure in the low pressure system shall
not exceed 100 psi and the pressure in the high pressure system shall not exceed 3300 psi. The
low pressure relief valve shall be adjustable in a range of from 50 psi, or less, to 100 psi. The high
pressure relief valve shall be adjustable in a range of from 100 to 3,000 psi. Each relief valve shall
have a minimum proof pressure rating of 1.5 times the maximum pressure setting.
3.7.5 Check valves. A check valve or equivalent assembly shall be used to protect the low
pressure system while high pressure system is in use.
3.7.6 Filter assembly. A minimum three micron filter shall be installed between pumps and
service hose.
3.7.7 Pressure gage. A hydraulic pressure gage of 0-5,000 psi pressure shall be provided. The
gage shall indicate fluid pressure produced by either the high or low pressure pump.
3.7.8 Hydraulic tubing and hoses. Tubing and hoses that form a part of the filler and
pressurization unit shall be capable of withstanding a proof pressure of 4,500 psi and a bursting
pressure of 7,500 psi.
3.7.9 Service hose assembly. The service hose assembly provided as a port of the filler and
pressurization unit shall be no less than 25 feet long or more than 35 feet long.
3.7.10 Bleed valves. Bleed valves shall be provided as part of the filler and pressurization unit
hydraulic system. The valves shall be used for bleeding type operations, as required, and shall
return the hydraulic fluid to the reservoir.
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