MIL-PRF-62365C(AT)
3.4.2 Running torque. The torque developed by the motor at any speed up to
3000 revolutions per minute (rpm) in either direction of rotation with a differential pressure of
2300 psi, shall not be less than 30 lb-in (3.4 N-m) (see 4.5.3.2).
3.4.3 Friction torque. The torque required to rotate the motor shaft at speeds less than
6 rpm at rated temperature, with no differential pressure or case pressure applied, shall not exceed
2.5 lb-in (0.28 N-m) (see 4.5.3.3).
3.4.4 Holding torque. The motor, acting as a pump, shall provide holding torque against
a gravity induced load torque which varies from 8 lb-in (0.9 N-m) to 24 lb-in (2.7 N-m) when
tested in accordance with 4.5.3.4.
3.4.5 Intermittent torque. The performance of the motor shall not be impaired by
repeated torque loading impulses sufficient to raise the differential pressure across the motor to
2700 psi (18 600 kPa). The duration of the loading shall not exceed one second and the torque
shall be in one direction only (see 4.5.3.5).
3.4.6 Attitude. The motor shall meet all requirements of this specification when mounted
in any attitude with a 20 psi (140 kPa) check valve installed in the drain line (see 4.5.3.6).
3.4.7 Resisting load. Pressure differential shall not exceed 2300 psi when the motor is
tested in accordance with 4.5.3.7.
3.4.8 Cylinder block lift. There shall be no cylinder block lift, as evidenced by the
absence of excessive case drain flow, when the motor is operated at 9000 rpm for 10 seconds in
each direction with no load on the shaft (see 4.5.3.8).
3.4.9 Volumetric efficiency. The volumetric efficiency of the motor shall not be less than
95 percent at speeds between 1500 and 6000 rpm (see 4.5.3.9).
3.4.10 Intermittent speed/endurance. The hydraulic motor shall not be damaged nor its
performance impaired by 5000 intermittent operation cycles as designated in table II, half in each
direction, at speeds up to 5000 rpm. The differential pressure across the motor shall be between
100 and 1700 psi (690 and 11 700 kPa) during the test cycle. The motor case drain pressure shall
not exceed 25 psi (170 kPa) (see 4.2.2 and 4.5.3.10).
TABLE II. Operational cycle.
Number of test cycles
Temperature of fluid at
Resistive load Overhauling load
motor inlet
100 + 20°F (38 + 10°C)
500
500
150 + 20°F (66 + 10°C)
1500
1500
170 + 20°F (77 + 10°C)
500
500
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