Operator/Crew Maintenance Troubleshooting

TM 5-4320-273-14

Refer to table 3-2 for troubleshooting which is allo-

actions. If you experience a malfunction which is not

listed or is not corrected by listed corrective actions,

cated to operator/crew maintenance levels.

notify your supervisor.

NOTE

Before you use this table, be sure you have performed

Maintenance Trouble-

3-7. Operator/Crew

all applicable operating checks.

shooting

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ENGINE

1. ENGINE FAILS TO CRANK WHEN STARTER BUTTON IS DEPRESSED.

NOTE

Use distilled drinking water or a good grade drinking water (excluding mineral water).

Step . Check to ensure electrolyte level in battery cells is 3ffl inch (0.99 cm) above the top of the plates. If electrolyte

level is below top of plates, add distilled water.

WARNING

Do not smoke or use an open flame In the vicinity when servicing the

battery. Batteries generate hydrogen gas, which is highly explosive.

Recharge batteries.

Charge the battery using a constant current charger. Check the speclflc gravity of the

electrolyte every 30 minutes. The battery is fully charged when you get a constant specific

gravity (1.250) reading for three 90 minute intervals.

CAUTION

Constant current battery charging is always preferred. If you must use a constant-potential

charger, battery temperatures must be maintained at less than 130xF (64.44xC) by inter-

rupting the charging procedures as this temperature is approached.

Step 2. Inspect for broken or damaged battery cables and for loose or corroded connections.

Clean battery posts and connections. Tighten loose connections at battery, ground, and starter. If cables are dam-

aged, notify organizational maintenance.

2. ENGINE CRANKS BUT FAILS TO START.

Step 1. Check ignition switch for "ON' position.

Turn on switch.

Step 2. Check to ensure oil pressure safety switch was reset.

Reset oil pressure safety switch.

Step 3. Check for insufficiently choked carburetor, especially when engine is cold.

Pull out choke.

Step 4. Check for empty fuel tank.

WARNING

Do not fill fuel tank while engine is running.

Refill empty or low fuel tank.

Step 5.. Check for improper setting on fuel source valve.

Set fuel source selector valve on T&NK or aux as required.

Step 6. Check for water or dirt in fuel bowl.

Service the fuel strainer.

Turn the fuel selector valve to the OFF position.

Loosen the nut (1, fig. 33) on the bail assembly (2) and swing the bail aside.

Remove the fuel bowl (3), gasket (-) and empty the fuel bowl contents. Wipe the fuel bowl out with a clean cloth.

Remove the strainer element (6) and inspect it for contamination. Replace a contaminated strainer elemenL

Install strainer element (5) in fuel strainer head (8).

Install gasket (4) and fuel bowl (3) in fuel strainer head (8).

Swing bail (2) under the fuel bowl and tighten the nut (l).

Turn the fuel selector valve to the ON position.

Change 4 3-5