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Instrument Control Panel Switches (cont)
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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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Ignition Switch Replacement.
TM 5-4210-220-12 4-24.  ELECTRICAL SYSTEM - Continued 4-24.6 Instrument Control Panel Seitches - Continued d. Air Switches (Fold-Down Panel) Replacement NOTE These  small  air  switches  are  used  to  set  the  truck  mode  and  to  operate  the  tank  valve,  CFR  governor,  water educator, and foam valve. (1) Drain all four truck air tanks. (2) Hinge up the fold-down panel as detailed in para. 4-24.4 paragraph c. (3) Tag and disconnect the air line from all three ports on the valve. (4) Unscrew nut (1) from front face of panel  Remove nut (1) and lockwasher (2). (5) Pull switch from rear of panel. (6) Remove fittings from valve ports and discard switch. (7) Install fittings in new air switch  Coat threads with pipe sealant (item 22, Appendix E) prior to installation. (8) Install new switch in panel hole.  Orientation of switch does not matter provided toggle operates up and down. (9) Install washer (2) and nut (1).  Tighten firmly. (10) Reconnect air lines as tagged in step 3 preceding. (11) Fold back panel and install retaining screws. e. Panel Lam Switch Replacement (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) Loosen screw (1) and pull knob (2) off switch. (4) Remove nut (3) and washer (4). (5) Pull switch from rear of panel and discard. (6) Install new switch in panel hole.  Be sure it is in same rotation as removed switch. 4-434

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