TM-9-2350-358-BD
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A6
TECHNICAL MANUAL; OPERATOR’S, UNIT, AND DIRECT SUPPORT SUPPORT MAINTENANCE
MARCH 1994
TM-9-2350-358-BD - Page 172 of 343
TM 9-2350-358-BD
7-10.
SWITCH, MASTER - CONTINUED
4.
Remove wires 29, 31 and 29-31 from fuel level switch.
5.
Remove fuel gage switch from driver’s fixed instrument panel.
6.
Cover bare ends of wires 29, 31 and 29-31 and secure using electrical insulation tape.
7.
Install good switch taken from fuel gage switch position, into MASTER power switch position.
8.
Connect wires 459, 459A and 459B to switch in MASTER power switch position.
9.
Record BDAR action taken.
When mission is complete, as soon as practical, repair the equipment/system using
standard maintenance procedures.
7-11.
SWITCH, NEUTRAL, SAFETY
General Information:
The neutral safety switch is a mechanical/electrical switch that prevents the M109A6 starter motor relay from closing with
the transmission in any position other than neutral.
Limitations:
If the neutral safety switch section in the air cleaner blower relay circuit is also inoperative, the air cleaner blowers will not
operate, reducing engine power.
Personnel/Time Required:
•
1
soldier
•
0.5 hour
Materials/Tools:
•
Wire, electrical (item 74, Appendix C)
•
Tape, insulation electrical (item 63, Appendix C)
References:
TM 9-2350-314-20-1-2
Procedural Steps:
WARNING
With the neutral safety switch bypassed, the engine can be started
with the transmission in any gear position.
With the neutral safety
switch bypassed, always ensure that the transmission is in the
neutral (out of gear) position before attempting to start the engine.
Failure to heed this warning could cause the M109A6 to lurch
forward when the engine is started, if the transmission is in a gear
position, causing damage to equipment or injury or death to
personnel.
1.
Gain access to the neutral safety switch.
7-12
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