TM 5-4310-343-35
b. Back Pressure Valve
(a) Refer to paragraph 5-6.d. for removal instructions.
(b) Disassembly or Overhaul of the Back Pressure Valve is not recommended.
(c) Perform testing outlined in paragraph 5-12 (b) (2), if operation is insufficient, discard complete back
pressure valve and replace with new operable valve.
c. Pressure Switch Relief Module
(1) Disassembly
(a) Refer to paragraph 5-6.e. for removal instructions.
(b) Refer to figure 6-3 and disassemble pressure switch relief module as follows.
(1) Cut and discard lock wire from jam nut (33). Loosen jam nut.
(2) Cut and discard lock wire from cover screws (4). Then remove cover (3) by removing screws.
Discard gasket (6).
(3) Remove two screws (9) to loosen switch bracket (8). Let bracket hang loose.
(4) Hold slotted end of pusher (20) with screwdriver and loosen lock nut (12). Back off nut slowly
because parts behind it are spring loaded. Lift off washer (13), compensator (11), hat (14), spring (15).
(5) Cut and discard safety wire from locking screw (6) on flanged end of outlet housing (32). This is
screw which is nearest to cover, remove screw.
(6) Unscrew cap (17) and remove pusher (20), spring 18), and ball (21).
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