Filter assemblies

TM 55-4920-442-13 & P

3-79. Filter assemblies - Test

3-79

This task covers:

Testing

INITIAL SETUP

Personnel Required:

MOS 67

TESTING - HIGH PRESSURE FILTER

1. Perform steps in para. 3-79 for removing elements but do not discard.

2. Install an AN814-12 fitting with a bore seal into the threaded connection of the filter head and install fiber bowl. Do

not install elements for the test.

3. Check the reset button to determine that it is depressed.

4. Apply minimum hydraulic pressure, 85 psig to inlet port of filter. If switch does not actuate warning light, slowly

increase to maximum 115 psig. Switch is preset for 10015 psig.

5. During the above test, after the switch has actuated, depress the reset button; the warning light should go off. When

the reset button is released, it should rise and the warning light should illuminate. Reduce pressure to zero and depress

reset button. The warning light should go off and the reset button remain depressed.

6. There should be continuity between switch connector pins B and A when the switch is activated. Pin A on the switch

should be connected to pin 2 on the warning light.

7. After successfully completing this test, remove the AN -fitting installed in step 2.

8. Reinstall the reserved element(s) and filter bowl.

END OF TASK

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