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TM 5-4210-220-12
4-24. ELECTRICAL SYSTEM - Continued
c.
Tachometer Sensor Replacement.
(1)
Check APU is shutdown (see Chapter 2) and
disconnect batteries as detailed in para. 4-24.12
prior to replacing any sender unit.
(2)
Tag and remove wires (1) from tachometer
sensor.
(3)
Loosen locknut (3) and unscrew sensor (2) from
flywheel housing.
(4)
Install new sensor in housing. Screw in until tip
of sensor just touches the starter ring gear.
(5)
Back out 1 full turn and tighten locknut securely.
(6)
Reconnect wires to both terminals as noted in
step 1 preceding.
(7)
Test tachometer as detailed in TEST preceding.
d.
Speedometer Sensor Replacement.
(1)
Check APU is shutdown (see Chapter 2) and
disconnect batteries as detailed in para. 4-24.12
prior to replacing Sensor.
(2)
Tag and remove wires (1) from speedometer
sensor which is located in the rear housing of the
transmission.
(3)
Loosen nut (3) and remove sender (2).
(4)
Check drive tang in transmission housing cannot
be turned. If it does turn, the gear drive is faulty.
Replace as in steps 8 thru 10.
(5)
Replace sender. Be sure drive tang from gear drive alines with slot in sender.
(6)
Tighten nut (3) securely.
(7)
Replace wires (1). Drive truck and ensure speedometer indicates truck speed.
(8)
If there is still no signal remove sender again and remove sleeve (4).
(9)
Lift out gear drive and check for signs of damage Gear teeth may be stripped or lock between
gear and shaft may have broken. Replace gear drive if any fault is evident.
(10)
If gear is missing or teeth are badly damaged, transmission may require overhaul. Refer to
General Support Level.
4-453
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