Direct Support Mechanical Troubleshooting.

TM 9-2320-386-24-1-2

0293 00

DIRECT SUPPORT TROUBLESHOOTING PROCEDURES

EXTENDED SERVICE PROGRAM (ESP)

TRUCK, CARGO, 2-1/2-TON, 6X6, M44A3 SERIES TRUCKS (DIESEL)

M35A3, W/O WINCH (NSN 2320-01-383-2047); W/WINCH (NSN 2320-01-383-3850);

M35A3C, W/O WINCH (NSN 2320-01-383-2050); W/WINCH (NSN 2320-01-383-2049);

M36A3, W/O WINCH (NSN 2320-01-383-2048); W/WINCH (NSN 2320-01-383-2046).

DIRECT SUPPORT MECHANICAL TROUBLESHOOTING

This work package provides diagnostic and corrective procedures for the mechanical system at Direct

Support maintenance levels. The information in this work package is for use in conjunction with TM 9-

2320-361-34 and chapter 3 of this manual. The troubleshooting system index will help in finding specific

problems and solutions in Direct Support Mechanical Troubleshooting.

WARNING

Operation of a deadlined vehicle without preliminary inspection

may cause injury to personnel and/or damage to equipment.

NOTE

Notify your supervisor if corrective action does not correct

malfunction.

Direct Support Mechanical Troubleshooting.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ENGINE

1. ENGINE WILL NOT CRANK

Step 1. Remove starter (WP 0091 00) and check start drive gear and flexplate ring gear for broken

and missing teeth.

a. If starter drive gear teeth are damaged, repair starter (TM 9-2920-243-34).

b. If flexplate ring gear teeth are damaged, replace flexplate ring gear (WP 0337 00).

Step 2. Check engine for fluid locked pistons.

a. Remove all fuel injectors (WP 0319 00). Crank engine by hand and examine any fluid

expelled from cylinders. If fluid is coolant/water, perform malfunction 10, step 2. If fluid

is fuel, perform malfunction 19.

b. Turn crankshaft by hand. If crankshaft turns easily, install fuel injectors (WP 0319 00)

and proceed to step 4. If crankshaft turns hard, or does not turn, proceed to step 3.

Step 3. Check engine for mechanical lockup.

a. Remove fan drivebelt (WP 0084 00) and turn drive pulley of each belt-driven accessory.

If drive pulley does not turn, replace accessory component (WP 0087 00, WP 0081 00,

WP 0089 00 (Prestolite), or WP 0090 00 (Leece-Neville).

b. Remove valve cover (WP 0028 00). Turn crankshaft by hand at vibration damper and

visually check valve train operation. If valve train is not operating properly, check

camshaft and crankshaft gears, cam roller followers, push rods, and rocker arms for

bends, cracks, and breaks. Replace if damaged (WP 0309 00 or WP 0308 00), or notify

GS maintenance.