Quantcast Electric  Switch  Repair  (Heater  and  panel  light switches)

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INSTALLATION - TM-5-4210-220-12_261
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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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Throttle Regulator Repair.
TM 5-4210-220-12 4-13   PUMP BODY - Continued 4-13.1 Structural Control Panel - Continued b. Electric  Switch  Repair  (Heater  and  panel  light switches). NOTE Control  panel  may  remain  Installed. Switches are non-repairable. Replace if faulty. (1) Tag and remove wires from switch. (2) Remove  protective  boot  (1)  and  nut  (2) Remove switch and discard. (3) Install  new  switch  using  nut  (2)  provided with switch. (4) Install protective boot (1). (5) Connect wires to switch as tagged. (6) Set    battery    switch    to    BOTH.        Check function of new switch. c. Air Switch Repair (tank, foam, eductor and flush switch). NOTE Control  panel  may  remain  Installed. Air switches are non-repairable. Replace if faulty. (1) Tag and remove air lines from switch. (2) Remove  nut  (1)  and  switch  body  (2)  and discard. (3) Install   new   air   switch   (2)   using   nut   (1) provided with switch. (4)    Apply pipe sealant (item 22, Appendix E) to  elbow  fittings  (3)  and  install  in  switch body. (5) Connect air lines to switch as tagged. (6) Close   air   tank   drain   valves,   set   battery switch  to  BOTH  and  start  main  engine. Start     and     operate     the     structural     fire system as detailed in para. 2-11.  Be sure the air switch operates correctly. 4-122

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