TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 320 of 1275

TM 9-2350-311-20-1

3-3 TROUBLESHOOTING CHART —

CONTINUED

r.

ENGINE OIL PRESSURE GAGE CIRCUIT —

ENGINE OIL PRESSURE INDICATOR FAILS TO

CONTINUED

OPERATE WITH ENGINE RUNNING; ALL OTHER

INSTRUMENTS OPERATE

T

OO

I

S

. .

General mechanic’s tool kit (item 64, Appx H)

Equipment Conditions

Engine access door open (TM 9-2350-311-10)

Multimeters (item 36, A

PPX

H)

Transmission access doors open (TM 9-2350-311-10)

TA-1 probe kit (item 43, Appx H)

Portable instrument panel cover removed (para 8-17)

(Long test leads may be needed for some tests;

Engine compartment access cover removed (para 11-5)

16 AWG wire may be used as an extension.)

Personnel Required

Disconnect lead 36 from engine 011

pressure transmitter.

Turn MASTER switch ON and check

ENGINE OIL PRESSURE gage for a

reading.

If ENGINE OIL PRESSURE gage shows a

maximum reading, place a jumper wire

from lead 36 to ground.

Check gage for reading.

Turn MASTER switch OFF.

Two

.

1

A

1.

2.

3.

4.

5.

Does ENGINE OIL PRESSURE gage read minimum

when grounded and maximum when not grounded?

Replace engine oil pressure transmitter

(para 8-8).

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