Quantcast Purge  Valve  and  Exhaust  Diaphragm  Repair  - Continued

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End Cover Repair
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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Thermostat and Heater Repair
TM 5-4210-220-12 4-22.  AIR SYSTEM - Continued 4-22.12  Air Drier - Continued d. Purge  Valve  and  Exhaust  Diaphragm  Repair  - Continued (5) Remove the capscrew (6) which holds the assembly together. (6) Separate  capscrew  (6),  purge  valve  (8), purge   valve   piston   (13),   and   the   piston return spring (12). (7) Discard  the  piston  O-ring  (14),  the  purge valve   (8),   and   the   piston   return   spring (12). (8) Inspect  all  remaining  parts.    Be  sure  all surfaces,  bores,  parts,  and  passages  are clean and dry. (9) Lubricate all new O-rings and piston bore in   hex   cap   nut   (9)   with   petroleum   jelly (item 21, Appendix E). (10) Install O-ring (14) on piston (13). (11) Install the purge piston return spring (12) and piston (13) in hex cap nut (9). (12) Install the purge valve (8) In the cap nut so that the rubber portion rests on the metal seat of the cap nut. (13) Secure the valve to the piston using the screw (6) and lockwasher (7) and torque to 50 in. lb (5.6 Nm). (14) Install the two O-rings (10 and 11) on the hex cap nut (9). (15) Lubricate the cap nut threads and the cap nut bore of the end cover with petroleum jelly (item 21, Appendix E).  Install the cap nut, torquing it to 240 in. lb (27 Nm). (16) Secure the exhaust diaphragm (3) to the exhaust cover (5) using screw (1) and washer (2). (17) Secure the exhaust cover (5) to the hex cap nut (9) using screw (4). (18) Install end cover in drier as detailed in End Cover Repair, steps 7 thru 10, preceding. e. Thermostat and Heater Repair NOTE These may be repaired with drier on truck. Ensure air tanks are drained prior to repair. (1)  Remove end cover as detailed in End Cover Repair, steps 1 thru 5, preceding. 4-384

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