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Foot Throttle Valve
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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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TM 5-4210-220-12 4-22 AIR SYSTEM - Continued (3) Ease valve body through cab floor. (4) Seal area around flange with sealant (item 25, Appendix E) and install screws (1) to secure valve to cab floor. (5) Start  main  engine  and  ensure  foot  throttle  provides  increase  in  engine  speed  in  proportion  to  treadle depression.  Ensure engine cuts back to low idle immediately treadle is released. (6) Stop main engine and disconnect batteries. (7) With  treadle  depressed  about  half  way,  brush  soap  solution  over  entire  valve  assembly  and  connectors. No  leakage  is  permitted.    Tighten/remake  joints  as  required.    Ensure  this  bubble  test  is  carried  out  with primary air tank at greater than 65 psi (450 kPa). REPAIR a. Treadle Repair NOTE This can be repaired without removing whole foot throttle valve from truck. (1) Remove  spring  clip  (2),  pin  (1),  pedal  (9), and spring (3). (2) Tap bushings (4) out of pedal. (3) Remove  spring  clip  (5),  pin  (6),  bushings (7), and roller (8). (4) Remove dust boot (10) and push rod (11). (5) Inspect    all    parts    for    wear,    or    stiffness. Replace any parts failing inspection. NOTE Item 1 thru 8 are available in the repair kit.  This kit also includes parts to repair the valve subassembly. (6) Lubricate both pivot pins and push rod with silicone grease (item 27, Appendix E). (7) Install push rod (11) in valve.  Install dust boot (10) over push rod.  Be sure dust boot engages in housing and on push rod. (8) Put bushings (7) in roller (8).  Slide pin (6) through pedal and roller bushing and retain with clips (5). (9) Install bushings (4) in valve housing. 4-371

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