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TM 5-4320-306-24
3-20. SERVICE/REPLACE TACHOMETER DRIVE (Continued)
CLEANING/INSPECTION:
WARNING
Death or serious injury could occur if diesel fuel oil is not handled carefully Use in a well-
ventilated area away from open flame, arcing equipment, ignition sources, heaters, or excessive
heat. Always store fuel in proper, marked containers. DO NOT SMOKE.
Death or serious injury could occur if compressed air is directed against the skin. Do not use
compressed air for cleaning or drying unless the pressure is/has been reduced to 30 psi (2.11
kgcm2) or less. When working with compressed air always use chip guards, eye protection, and
other personal protective equipment.
1.
Clean angle drive (4), nut (5), driver actuator (8), sleeve (3), and tachometer cable (2) with diesel fuel oil and dry
with compressed air. Inspect components for damage, rust, wear, or malfunctions Remove rust or corrosion with
fine sandpaper.
2.
Check that the tachometer inner cable turns freely within the outer sheath
3.
Clean dirt from inside the tachometer cable sheath by flushing drops of diesel fuel oil through the cable while
turning the inner cable by hand or with an electric drill
4.
Inspect angle drive (4), nut (5), and tachometer cable (2) for stripped or damaged threads Replace component
with stripped or damaged threads. If angle drive or tachometer cable is sticking or frozen, soak in diesel fuel oil
and work free. Dry with compressed air Lubricate with lubricating oil
5.
Inspect driver actuator (8) and sleeve (3) for wear or other damage to the internal bore that would prevent secure
fit of the mating components.
INSTALLATION:
1.
Install new ring (7) in front cover (6) bore.
2.
Install driver actuator (8) on spigot pin (9) of camshaft
3.
Thread nut (5) onto angle drive (4) and apply sealing compound to the threads of angle drive.
4.
Aline drive tab of angle drive (4) with driver actuator (8) and thread angle into front cover (6).
5.
Aline and connect the drive tab of angle drive (4) and the drive tab of tachometer cable (2) with sleeve (3).
Tighten threaded collar (1)
3-113
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