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 1190 of 1275

TM9-2350-311-20-1

GO 1 VTM CONNECTIONS AND CHECKOUT –

CONTINUED

Turn engine off before installing

pulse tachometer.

Clean all mounting surfaces before

installing pulse tachometer to prevent

entry of foreign substances that may

damage engine or transducer.

INSTALL PULSE TACHOMETER (TK ITEM ,34);

.

5

-

Disconnect tachometer cable (para 9-18).

- Install pulse tachometer in place of removed

tachometer cable.

- Connect P1 of transducer cable W4 to

6

J2 on VTM.

- Connect P2 of transducer cable to

connector on pulse tachometer.

l

NOT E

If rpm or power tests vary more than 5%,

remove tach drive adapter and pulse

tachometer from tach cable. Connect pulse

tachometer to tach cable interface on

engine. Rotation of vehicle tach speed

adapter may be required to connect pulse

tachometer.

I

CAUTION

Be sure cable W4 is clear of belts and fan blades.

I

Go to GO 2 (Figure 2,

sheet 8).

Figure 2, Sheet 7 of 20

I-13

WARNING

CAUTION

MAKE CABLE CONNECTIONS: