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 312 of 1275

TM

9-2350-311-20-1

3-3 TROUBLESHOOTING CHART —

CONTINUED

q. TRANSMISSION OIL PRESSURE INDICATOR

TRANSMISSION OIL PRESSURE INDICATOR NEEDLE

CIRCUIT — CONTINUED

FAILS TO MOVE OR IS UNSTEADY; ALL OTHER GAGES

OPERATE PROPERLY — CONTINUED

CONTINUED FROM STEP A

I

Reconnect lead 321 to transmission oil

B

1.

pressure transmitter.

2. Disconnect lead 321 from TRANSMISSION

OIL PRESSURE gage.

3. Turn MASTER switch ON and check

TRANSMISSION OIL PRESSURE gage for

a reading.

4. If TRANSMISSION OIL PRESSURE gage

shows a maximum reading, use a jumper

wire to ground gage.

5. Check gage for reading.

6. Turn MASTER switch OFF.

Does TRANSMISSION OIL PRESSURE gage show

minimum when grounded and maximum when not

grounded?

1. Reconnect lead 321 to TRANSMISSION OIL

C

PRESSURE gage.

2. Disconnect lead 27 from TRANSMISSION

OIL PRESURE gage.

3. Place red lead of multimeters in lead 27 and

black lead to ground.

4. Turn MASTER switch ON and check for

voltage.

5. Turn MASTER switch OFF.

Is voltage present?

PORTABLE

INSTRUMENT PANEL

3-212