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Figure 3-49.  Leak Testing Level Assembly
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Figure 3-50.  Leak Testing Cover Assembly
TM 9-254 3-23. Level Assembly and Cover Assembly Leakage Test - Continued c. Cover Assembly 10543756.  Perform leakage test of cover assembly as follows: NOTE o Steps (2) through (7), refer to figure 3-48. o Insure   that   preformed   packing   is   secured   to   bottom   of   cover   assembly   before securing to the fabricated adapter. (1) Perform the setup of the single stage pressure test fixture as described in paragraph 3-18a. (2) Secure cover assembly (9) to the fabricated leak test adapter (4) with four machine screws (3) and four wing nuts (5). (3) Connect hose assembly (8) to the inlet port (6) on fabricated leak test adapter (4). (4) Adjust pressure regulator valve (2) clockwise until 1 psig is registered on the low pressure gage (1). (5) Maintain a 1 psig pressure for 10 seconds, then adjust pressure regulator valve (2) counterclockwise to the closed position. (6) Disconnect hose assembly (8) from the inlet port (6) and lay hose assembly aside. NOTE Steps (7) through (9), refer to figure 3-50. (7) Completely immerse the cover assembly (2) and fabricated leak test adapter (3) into a container of clear water (1). (8) While immersed, inspect the area around the lamp shell (4) for the presence of air bubbles that indicates a pressure leak. (9) Remove cover assembly (2) and fabricated leak test adapter (3) from the container of clear water (1). NOTE Steps (10) through (12), refer to figure 3-48. (10)  Release pressure from fabricated leak test adapter (4) at inlet port (6). 3-53

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