TM 5-2420-231-23-1
0019
Table 1. Tachometer Does Not Function or Is Inaccurate - Continued.
019
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
9. Inspect drive belt tensioner mount- Drive Belt Tensioner Mounting Bolt
Tachometer Does Not
ing bolt (Figure 2, Item 2).
OK - Proceed to step 10.
Function or Is Inaccurate -
Continued
Drive Belt Tensioner Mounting Bolt
Loose - Tighten drive belt tensioner
mounting bolt (WP 0133).
Proceed to step 10.
10. Visually inspect drive belt ten-
Drive Belt Tensioner Pulley OK -
Proceed to step 11.
sioner pulley (Figure 2, Item 3) for
wear and damage.
Drive Belt Tensioner Pulley Worn or
Damaged - Replace drive belt
tensioner (WP 0133) and drive belt (WP
0095).
Proceed to Test Step 6.
11. Rotate drive belt tensioner pulley
Drive Belt Tensioner Pulley OK -
Proceed to step 12.
(Figure 2, Item 3) by hand while
listening for noise and rough or
Drive Belt Tensioner Pulley Noisy
When Rotated - Replace drive belt
sticking bearings.
tensioner (WP 0133) and drive belt
(WP 0095).
Proceed to Test Step 6.
Drive Belt Tensioner Pulley Binds,
Sticks, or Is Rough When Rotated -
Replace drive belt tensioner (WP 0133)
and drive belt (WP 0095).
Proceed to Test Step 6.
12. Slowly rotate drive belt tensioner
Drive Belt Tensioner and Drive Belt
(Figure 2, Item 1) through the full
OK - Install alternator (WP 0153) and
limits of travel. Drive belt tensioner
drive belt (WP 0095) and connect
should extend fully when released
batteries (WP 0157).
and actuate smoothly without bind-
Proceed to Test Step 2.
ing or sticking.
Drive Belt Tensioner Binds or Sticks
- Replace drive belt tensioner
(WP 0133).
Proceed to Test Step 6
Drive Belt Tensioner Does Not Fully
Extend When Released - Replace
drive belt tensioner (WP 0133) and
drive belt (WP 0095).
Proceed to Test Step 6.
0019-4
