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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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REPLACEMENT - TM-5-4210-220-12_574
TM 5-4210-220-12 4-24.  ELECTRICAL SYSTEM - Continued g Tachometer Test (1) Start main engine and monitor the engine tachometer in the cab and on the pump body.  The engine should idle at 800 rpm.  A single sensor on the engine drives both the cab and pump panel tachometers. (2) If neither meter is indicating, replace sensor unit and retest as in 1 preceding. (3) If only one tachometer has no reading, tag and remove wires from tachometer and sensor unit (see illustration for sensor location).  Tachometer wires 48 and 49 run from cab meter through plug to terminal strip in cab fold-down panel to engine compartment.  Tachometer wires from pump panel run from meter through plug to engine compartment. (4) If wires are continuous replace failed meter and retest as in 1 preceding h Speedometer Test (1) Start main engine and monitor the speedometer when vehicle is being driven.  A single sensor on the transmission drives the cab speedometer. (2) If the speedometer registers no reading, tag and disconnect wires from the sensor and the meter (3) Test wires for continuity if these wires are continuous replace meter and test as in 1 preceding (4) If meter still does not register, replace the sensor unit. 4-451

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