TM 5-4310-343-35
(k) Position spring (15), hat (14), compensator (11), and washer (13), on pusher (20), and secure with
lock nut (12).
(1) Secure switch bracket (8) with two screws (9).
(2) Test reassembled pressure switch relief module as follows:
(a) Connect the overhauled pressure switch relief module to a suitable test rig for proof pressure testing.
(b) Plug up one inlet port and outlet port then assemble inlet port test fitting Part Number 843096 or
equivalent to remaining inlet port and relief valve port test plug Part Number 843095 or equivalent into outlet housing (32)
and apply proof pressure of 4500 psig to inlet port fitting.
WARNING: BE EXTREMELY CAREFUL WHEN WORKING WITH HIGH PRESSURE
AIR TO PREVENT INJURY TO PERSONNEL OR DAMAGE TO EQUIPMENT.
DO
NOT ATTEMPT TO TIGHTEN ANY FITTING OR PERFORM ANY WORK ON
EQUIPMENT WHEN THE SYSTEM IS UNDER PRESSURE. DO NOT TAMPER WITH
ANY PRESSURE RELIEF VALVES.
(c) Hold pressure for three minutes. Relieve pressure and then remove test fitting and plugs from inlet
port, outlet port and outlet housing (32).
(d) Inspect for deformation or permanent set.
(e) Connect variable pressure source to one inlet fitting and connect one outlet port to a non-recoil fitting.
Plug remaining ports for switch operation test.
(f) Slowly increase pressure until switch operation occurs. Pressure switch should open when pressure
reaches 3100 to 3300 psig; pressure switch should close when pressure is dropped to 2800 psig.
(g) Relief valve passes 4 scfm at 3900 psig and reseats at 3350 psig minimum. If specified operation
does not occur, adjust lock nut (12) to obtain correct pressure switch operation, and using adjustment cap driver Part
Number 843052 or equivalent and adjust cap (17) to obtain correct relief valve operation.
WARNING: DO NOT ATTEMPT TO MAKE ADJUSTMENTS UNTIL AIR PRESSURE
HAS BEEN PURGED FROM ALL PARTS.
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