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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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