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REPAIR - TM-5-4210-220-12_472
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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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REPAIR (cont) - TM-5-4210-220-12_474
TM 5-4210-220-12 4-22 AIR SYSTEM - Continued 4-22.3 Spring Brake Valve - Continued (8) Remove the four screws and lockwashers that secure the cover to the body (9) Remove the cover (13) and the three piston springs (14) NOTE Some spring brake valves have only two piston springs. (10)    Remove the small piston (15) and the small and large O-rings (16) (11) Remove the large piston (17) Remove piston O-rings (18) and (19) (12)    Discard all parts except cover (13), piston (17), pipe plug (1), exhaust cover (5), cap nut (8), piston (15), machine screws and body (13)    Clean all remaining  parts and inspect for excessive wear, scrub marks or deterioration. Inspect the valve seats for nicks or burrs. Replace any parts failing inspection. (14)    Lubricate all new O-rings, O-ring grooves, and piston bores with petroleum jelly (item 21, Appendix E) (15)    Assemble the check valve (4), and valve spring (2) and install in body (16)    Apply pipe sealant (item 22, Appendix E) to the socket head pipe plug (1) and install In the body.  Tighten to 130 - 170 in. lb (14.6 - 19.3 Nm) (17)    Install inlet and exhaust valve assembly (7) in valve body (18)    Secure the exhaust cover (5) with the two screws and lockwashers.  Tighten to 20 - 30 in. lb (2.25 - 3.38 Nm) (19)    Install exhaust diaphragm (6) into the exhaust cover (20)    Place inlet exhaust valve (12) in the body.  Install the valve spring (11) and valve stop (10) (21)    Install 0-ring (9) on cap nut and install cap nut (8) in body.  Tighten to 100 - 125 in. lb (11.3 - 14.1 Nm) (22)    Install the small and large O-rings (16) on the small diameter piston (15) and install piston in the body 4-346

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