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 1230 of 1275

TM 9-2350-311 -20-1

WARNING

On some vehicles that have MASTER switch in negative battery cable, sparking may occur if VTM

case touches vehicle while MASTER switch is off and VTM is on. Sparking in presence of fuel or

vapors presents hazard. Avoid hazard by doing all testing with vehicle MASTER switch on.

Excessive pressure can damage transducer. Pressure being measured should not exceed

1000 psig (68.9 kg/sq cm).

Stop vehicle engine.

Remove oil pressure sending unit (para 8-8).

Install blue-striped pressure transducer (TK

item 17) in place of sending unit on engine.

Connect P1 of transducer cable W4 to J3

on VIM.

Connect P2 of transducer cable to connector

on pressure transducer.

During offset test, system being

measured must be repressurized.

Refer to TM 9-4910-571-12&P

for offset fault isolation.

Go to Figure 3, sheet 28.

Figure 3, Sheet 27 of 36

I-53

CAUTION

NOTE