Section IV. TROUBLESHOOTING PROCEDURES

TM 3-1040-276-23

Section IV. TROUBLESHOOTING PROCEDURES

actions. If a malfunction is not listed or is not corrected

2-5. ORGANIZATIONAL MAINTENANCE TROUBLE-

by listed corrective actions, notify your supervisor.

SHOOTING PROCEDURES.

a. The table (p 2-8) lists the common malfunctions

c. Before you use the troubleshooting table, check

with the operator to determine if all operator trou-

that may be reported to you by the operator or you may

bleshooting procedures for the reported malfunction

find during maintenance of the M3A4 smoke generator

have been followed. If in doubt, repeat the operator

or its components. Perform the tests/inspections and

troubleshooting procedures before proceeding and

corrective actions in the order listed.

after replacing faulty components.

b. This manual cannot list all malfunctions that may

occur, nor all tests or inspections and corrective

SYMPTOM INDEX

Troubleshooting

Procedure

Page

AIR PRESSURE GAGE

Registers low pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

AIR PUMP ASSEMBLY/AIR ACCUMULATOR ASSEMBLY

Gives weak or no starting air blast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

FOG OIL EXHAUST HOSE

Gushes fog oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

FOG OIL PUMP

Fails to pump fog oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

IGNITION CABLE/MAGNETO

Gives no spark or weak spark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

MAGNETO AIR PUMP ASSEMBLY

Fails to purge smoke/exhaust gases from engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

TROUBLESHOOTING

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. AIR PRESSURE GAGE REGISTERS LOW PRESSURE.

Step 1. Check air accumulator and air pump assembly for loose fittings and connections and for

cracks in air pump assembly and air accumulator.

Tighten loose fittings and connections and replace cracked air pump assembly (p 2-32)

and air accumulator (p 2-15).

Step 2. Check air accumulator check valve.

Replace faulty air accumulator check valve (p 2-19).

2-8