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REPAIR (cont) - TM-5-4210-220-12_492
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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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Emergency Brake Valve
TM 5-4210-220-12 4-22 AIR SYSTEM - Continued (16) Install three new O-rings (2 of 11) and (12) in grooves of lower static piston assembly (24). NOTE The larger diameter O-ring is installed in groove nearest to bottom of piston assembly. (17) Install new O-rings (6) and (7) on relay piston (22) and new O-ring (9) on No 1 circuit piston (25). (18) Carefully clamp No 1 circuit piston (25) in a soft-jawed vise taking care not to damage the exhaust seat or the  outside  diameter.    Assemble  the  new  rubber  spring  (10)  over  the  center  stem  of  the  center  of  the piston, then the spring seat (19), and the new spring seat nut (16). (19) Tighten the spring seat nut until the end of the piston stem and the spring seat nut are flush. (20) Insert relay piston spring (5), and relay piston (22) in top end of lower static piston (24).  Install No 1 circuit piston spring (8) and No 1 circuit piston assembly (25) in the bottom of lower static piston (24). (21) Install  stem  bolt  (21)  through  bore  of  relay  piston  (22).    Invert  entire  lower  static  piston  assembly  and position over a screwdriver mounted in a vise.  Engage screwdriver blade in slot in head of stem. (22) Depress   No   1   circuit   piston   assembly   (25)   against   spring   until   locking   groove   is   accessible   through rectangular  hole  in  side  of  lower  static  piston  (24).    Engage  a  screwdriver  or  wire  in  locking  groove  and release pressure on piston. (23) Install stem spring (23), spring seat (15), and stem nut (14) Torque to 20 - 30 in. lb (2.3 - 3.4 Nm). (24) Install upper static piston assembly (13) in valve body (25) Install  lower  static  piston  assembly  (24)  In  valve  body    Install  retainer  (18),  making  certain  locking  tabs engage boss on valve body. (26) Install and test the valve assembly as detailed in INSTALLATION preceding. 4-367

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