TM 5-2420-231-23-1
0019
Table 1. Tachometer Does Not Function or Is Inaccurate - Continued.
019
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7. Inspect alternator fan (Figure 1,
Alternator Fan OK - Proceed to step 8.
Tachometer Does Not
Item 8) for bends or damage.
Alternator Fan Bent or Damaged -
Function or Is Inaccurate -
Replace fan (WP 0153).
Continued
Proceed to Test Step 6.
8. Rotate alternator drive shaft
Alternator Drive Shaft OK - Tighten
(Figure 1, Item 9) by hand while
alternator drive pulley nut (WP 0153).
listening for noise and for rough or
Proceed to step 9.
sticking bearings. Alternator drive
Alternator Drive Shaft Noisy When
shaft should rotate with little or no
Rotated - Replace alternator (WP
noise and rotate smoothly without
0153) and drive belt (WP 0095).
binding or sticking.
Proceed to Test Step 6.
Alternator Drive Shaft Binds, Sticks,
or Is Rough When Rotated - Replace
alternator (WP 0153) and drive belt (WP
0095).
Proceed to Test Step 6.
Figure 1. Alternator, Mounting Bracket, and Drive Belt.
0019