MIL-PRF-45307C(AT)
4.6 Methods of inspection.
4.6.1 Materials and construction. Conformance to 3.2 through 3.3.4 shall be determined
by inspection of contractor records providing proof or certification that design, construction,
processing, and materials conform to requirements. Applicable records shall include drawings,
specifications, design data, receiving inspection records, processing and quality control standards,
vendor catalogs and certifications, industry standards, test reports, and rating data.
4.6.2 Performance. All performance testing shall be accomplished using hydraulic oil
conforming to MIL-H-46170 (see 3.4).
4.6.2.1 Volumetric efficiency. To determine conformance to 3.3.3 and 3.4.1, the pump
shall be connected to a double-acting cylinder with a piston area at each end of 2.75 square inches
(in.2) (17.7 square centimeters (cm2)). A needle valve and a 2000 psi (13 788 kPa) gage shall be
installed to each line from the pump to the cylinder. A pressure gage shall be installed between
the needle valve and the pump port. The system shall be charged to a pressure of 1500 psi
(10 342 kPa) with needle valve on the discharge side of the cylinder set to give a differential of
100 psi (689 kPa) between the ports of the pump. The control handle shall be rotated at a speed
of one revolution per minute (rpm). Distance traveled by piston rod of cylinder shall be measured
in one revolution of control handle by a dial indicator. This test shall be made once in a clockwise
direction and once in a counterclockwise direction of rotation.
4.6.2.2 Hydraulic backlash. To determine conformance to 3.4.2, the degree of hydraulic
backlash of the pump shall be determined by measurement with an indicator gage on the piston of
the cylinder and a protractor indicator mounted on the case of pump with a pointer on the handle.
4.6.2.3 Proof pressure. To determine conformance to 3.4.3, an internal hydrostatic
pressure of not less than 3000 psi (20 684 kPa) shall be applied to the pump and the pump port
and housing for a period of 1 minute. The pump shall be examined for damage to component
parts.
4.6.2.4 Pump handle torque. To determine conformance to 3.4.4, the pump shall be filled
with hydraulic oil under a working pressure of 1500 psi (10 342 kPa) and shall move the piston
with 60 psi (414 kPa) pressure differential, at a rate of rotation of not more than one rpm. The
torque required to turn the handle shall be measured by an approved method.
4.6.2.5 Pump leakage. To determine conformance to 3.4.5.1 and 3.4.5.2, the pressures
specified in 3.4.5.1 and 3.4.5.2 shall be applied to case port and both pressure ports while pump is
not rotated and while pump is rotated at 10 to 20 rpm. The rate of external leakage shall be
measured.
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