MIL-A-24533B(SH)
4 6.4 Breakaway pressure. The breakaway pressure shall be obtained by
shifting the rotary actuator to one of its extxeme positions and maintaining the
design pressure for a minimum of 1 minute. The actuator shall then be shifted to
the opposite position while observing the differential pressure required to start
movement. The test shall be repeated by shifting the actuator in the opposite
direction. Breakaway pressure in excess of the specified value (see 3 4.8) shall
constitute a failure of the test.
4.6.5 Torque tests. The test pressure (or pressures) as specified in the
applicable specification sheet shall be applied to the actuator through the
appropriate port (or ports). Maximum and minimum output torque shall be measured
and recorded five times (see 6.6), There shall be no evidence of loosening,
binding, or damage to the actuator shaft or parts. Temperature of the test fluid
shall be maintained at 40 20C while performing the torque test. The actuator
shall meet the requirements specified in 3.4.7 and 3.4.8.
4.6.6 Shock test. The actuator shall be shock tested CO ensure compliance
with 3.6(b). The actuator shall be disassembled and inspected for physical damage
after completion of the shock test. The actuator shall be considered to have
failed the shock test if it does not meet the rotational requirements specified in
3.4.5 and the pressure and leakage requirements specified in 3.4.1 and 3.4.10,
respectively, or shows any signs of physical damage upon disassembly. The
actuator shall be pressurized to the specified design pressure for the shock test
4.6.7 Endurance test. The actuator shall be endurance tested to the
specified number of cycles at the rated output torque and operating pressure.
Unless otherwise specified in the applicable specification sheet, the test shall
be conducted at a cycle rate of two to six cycles per minute. Periodically during
the test, the actuator shall be examined for external leakage, cracks, or loose
fasteners. Any of these defects along with the inability to develop the specified
torque or premature seal replacement shall constitute a failure of the test. Upon
completion of the endurance test, the group B tests in table I shall be repeated.
The proof pressure test specified in 4.6.3 need not be repeated. Inability to
meet the requirements specified in 3.4.6 shall constitute a failure of the test.
Hydraulic fluid used for the endurance test shall not be cleaner than the limits
established by the following minimum particle count:
Minimum number of
Particulate size
particles per
(micrometer)
100 milliliters
greater than 15
3,000
greater than 25
500
90
greater than 50
12
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business