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|  MIL-PRF-62365C(AT)
4.5.3.5 Intermittent torque. To determine conformance to 3.4.5, the outlet port of the
motor shall be connected to the drain through a 2700 psi relief valve. The inlet port shall be
supplied hydraulic fluid through an anti-cavitation check valve from the drain. The case drain
shall be connected to drain through a 20 psi (6.9 kPa) check valve. The torque shall be sufficient
to cause flow through the 2700 psi relief valve. Repeat for a total of 3000 cycles. The motor
shall be capable of meeting the performance requirements of 3.4 after the test.
4.5.3.6 Attitude. Conformance to 3.4.6 shall be verified by tests on a motor with the
mounting flange in at least 3 positions: horizontal; vertical, up; and vertical, down.
4.5.3.7 Resisting load. To determine conformance to 3.4.7, a load of 30 lb-in shall be
applied to the motor shaft tending to turn the motor shaft in opposition to the direction
established by the hydraulic flow (resisting load). The motor shall be run at 3000 rpm. The
pressure differential shall not exceed 2300 psi (see 3.4.2).
4.5.3.8 Cylinder block lift. To determine conformance to 3.4.8, the motor shall be
operated at 9000 rpm for 10 seconds in each direction with no load on the shaft. There shall be
no cylinder block lift as evidenced by the absence of excessive case drain flow.
4.5.3.9 Volumetric efficiency. To determine conformance to 3.4.9, the shaft shall be
loaded to impose an operating pressure on the inlet port, the motor speed shall be varied between
1500 and 6000 rpm and the volumetric efficiency shall not be less than 95%.
4.5.3.10 Intermittent speed/endurance. To determine conformance to 3.3.4 and 3.4.10,
the motor shall be started with a resistive load of 22 lb-in (2.5 N-m) applied to the output shaft.
The motor shall be operated at this load for 6 seconds at 5000 rpm and then stopped. The time
required to change direction of motor rotation shall not be less than 1 second nor more than
10 seconds. A sequence of 5 periods of operation in each direction followed by a nonoperating
period of not less than 2 minutes shall comprise one test cycle, with a resistive load. The motor
shall be acted upon by an overhauling load in the identical manner as the resistive load. The
overhauling load test cycle shall be the same as for the resistive load test cycle. Perform at least
5000 cycles in accordance with table II (see 6.3).
4.5.3.11 Leakage. Operating fluid for leakage tests shall be supplied at a temperature of
130F (54C) (see 3.4.11).
4.5.3.11.1 Running leakage test. To determine conformance to 3.4.11.1, with the motor
shaft free to rotate, apply 1000 +25 psi (6900 +170 kPa) to one port and throttle the output to
achieve approximately 10 rpm motor shaft speed. Apply 100 +10 psi (689.5 +69 kPa) to the case
drain.
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