MIL-DTL-62265 Filter Element And Relief Valve, Fluid Pressure, Hydraulic \(M-60 Tank Series\)This specification covers the performance and manufacture requirements for a hydraulic filter element and relief valve, disposable type, 3 and 5 micron filtration, herein referred to as the assembly.

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MIL-DTL-62265C(AT)

4.12.1.2 High temperature test. This test shall be performed in conjunction with the flow

fatigue test of 4.9.8.

4.12.2 Vibration test. The assembly shall be filled with prefiltered hydraulic fluid and the

inlet and outlet ports shall be capped with precleaned caps. The assembly shall be subjected to

and pass the test using procedure VIII, method 514 of MIL-STD-810, or equivalent (see 4.7),

with the following conditions.

a. Test level shall be the vibration curve shown in figure 1. Time schedule shall be a

total of 80 minutes per axis including 13-1/3 minutes dwell time at each

resonance.

b. Connections and instrumentation shall be attached to the assembly to permit

cycling as specified in (c) through (d).

c. Prior to vibration test, the housing shall be flushed with 2000 mL of prefiltered

hydraulic oil, and effluent contamination level shall be determined. The

contaminant value shall represent the blank value "C", as specified in the

migration formula below.

d. Conduct resonance search along each axis at reduced vibration amplitude over the

frequency range of 5-500 Hz. Up to four (4) resonant frequencies shall be

identified (the four most severe resonant frequencies if more than four present) in

each axis for the resonance dwell tests.

e. The assembly unit shall be subjected to resonance dwell and frequency cycling

tests with test levels and time schedule as identified in "a" above.

f. Subsequent to vibration tests, the caps shall be removed from the ports, and the

assembly shall be flushed with 2000 mL of prefiltered hydraulic oil. The effluent

shall be collected and the contamination level shall be determined. The

contaminant value shall represent the analysis value "A" as specified in the

following migration formula:

X = A-C

X = Migration analysis value

A = Analysis value

C = Blank value (per step c)

The filter element media migration shall not exceed 0.004 g.

g. Perform the hydraulic bubble point test on the flushed assembly in accordance

with 4.9.1.2. The bubble point value obtained shall not be less than the

minimum value established during hydraulic fluid preproduction or initial

production testing.