TM 10-8110-201-14&PSection VIII. MAINTENANCE OF PRESSURE CONTROL4-19. Pressure Control (Fuel Drums Only).a. Cleaning and Inspection (Exterior), Testingand Adjustment.(1) Using a mild soap and water solution with astiff bristle brush, remove foreign matter from thepressure control.(2) Inspect pressure control for cracked, loose,or missing parts.(3) Test and adjust pilot valve (para 4-22).b. Repair. When it becomes necessary to repairand adjust the pressure control, the procedures inparagraphs 4-20 thru 4-25 will be followed as re-quired.4-20. Diaphragm Valve.a. Removal and Disassembly.(1) Remove the plug (1, fig. 4-10) from the cover(3) as necessary.(2) Hold down the cover (3) firmly to preventspring action and remove the nuts (2) from studs(14). Gradually release the pressure on the coverand remove the cover from the studs.(3) Unscrew and remove guide shaft (4) fromcover (3).(4) Remove spring (5) from the pressure con-trol. Lift the diaphragm valve from the pressurecontrol.(5) Remove the nut (6) from machine screw (13).(6) Remove the large washer (7), diaphragm (8),poppet (9), disk (10), spacer (11) and small washer(12) from the machine screw (13).b. Cleaning, Inspection and Repair.(1) Wash all metal parts in a hot, mild soap andwater solution and dry the parts with a clean cloth.(2) Inspect the machine screw and guide shaftto determine if they are bent, cracked, broken, bur-red or have stripped threads.(3) Inspect the nut for stripped threads and aburred surface.(4) Inspect the diaphragm and disk to deter-mine if they are cut or deteriorated.(5) Inspect the spring to determine if it isbroken or collapsed.(6) Inspect the poppet, spacer and washers todetermine if they are cracked or burred.(7) Replace all unserviceable parts.c. Reassembly and Installation.(1) Place the small washer (12, fig. 4-10),spacer (11), disk (10) and poppet (9) on themachine screw (13).(2) Place the diaphragm (8) on the machinescrew (13).(3) Place the large washer (7) on the machinescrew with the raised side against the diaphragm.Install the nut (6) on the machine screw and tightenit securely.(4) Align the holes in the diaphragm valve inthe pressure control.(5) Screw the guide shaft (4) into the cover (3).(6) Place the spring (5) over the diaphragmvalve.(7) Align the holes in the cover with the studs,and place the cover on the pressure control.NOTEAssure the guide shaft is in the hole inthe machine screw.(8) Install nuts (2) on the studs and tighten thenuts to 20 foot-pounds (2.77 m-kg) torque.(9) Insert plug (1) in cover.4-21. Cycling Valve Assembly.a. Removal and Disassembly.(1) Hold the ring (2, fig. 4-1 1) in place andremove the capscrews (1).(2) Remove the ring (2) and cover (3) from thepressure control.(3) Grasp the button (4) and twist and pull ituntil the cycling valve is removed from thepressure control.(4) Remove the preformed packings (11) fromthe valve body (12).(5) Apply pressure on the spring (8) with thewasher (9) and remove the retaining ring (10) fromthe valve body.(6) Remove the retaining ring (13) from thecycling valve stem (6) and remove the valve bodyfrom the cycling valve stem.(7) Remove the washer and spring from thecycling valve stem.4-19
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