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Instrument Control Panel Switches
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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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Air Switches (Fold-Down Panel) Replacement
TM 5-4210-220-12 4-24.  ELECTRICAL SYSTEM - Continued (4) Remove screws (1) and face plate (2). (5) Lift switch from back of panel. (6) Install fittings in switch.  Coat thread with pipe sealant, (item 22, Appendix E) prior to installation. (7) Install switch in panel.  Retain with screws (1) and face (8) Install air lines as tagged in step 2 preceding. (9) Install air panel on instrument panel frame. c. Toggle Switch (Fold-Down Panel) Replacement NOTE These   switches   are   Single-Pole-Single-Throw   (SPST),   Single-Pole-Double-Throw   (SDT)   or   Double-Pole- Double-Throw (DPDT).  They are installed similarly.  Theses switches are used to operate all the truck lights (except panel lamp), the heated mirrors, the heater and defroster fans and the fire pump. The fir pump switch 8201K6 has a guard (8499K1) over the top to prevent inadvertent operation.  The guard and  switch  are  mounted  using  two  screws  rather  than  the  toggle  nut  outlined  in  the  following.    Otherwise replacement is the same as detailed following.  The headlamp switch is a push-pull.  Remove knob prior to remove, otherwise replacement is the same as detailed following. (1) Hinge up the fold-down panel as detailed in para. 4-24.4 paragraph c. (2) Tag and disconnect wires from failed switch. (3) Unscrew nut (1) from front face of panel.  Remove nut (1) and lockwasher (2). (4) Pull switch from rear of panel and discard. (5) Install  new  switch  in  panel  hole.    Be  sure  terminal  mounted  in  middle  of  switch  block  has  screw  head pointing to the right.  Check pump switch has open contacts when switch is pointing upwards). (6) Install washer (2) and nut (1).  Tighten firmly. (7) Reconnect wires as tagged in step 2 preceding. (8) Fold back panel and install retaining screws. 4-433

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