TM-9-2350-274-BD
M109/M110/M578 VEHICLES HOWITZER, MEDIUM, SELF-PROPELLED FULL-TRACKED
TECHNICAL MANUAL; OPERATORS, ORGANIZATIONAL DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1984
TM-9-2350-274-BD - Page 142 of 219
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TM 9-2350-274-BD
ARMAMENT AND FIRE CONTROL SYSTEM
10-12. POWER LOSS TO 645 PRESSURE SWITCH LINE (Cent).
Procedural Steps:
1.
Strip 1/2 in. to 1/4 in. from both ends of 10 feet of commo wire.
2. Remove domelight body from domelight assembly.
3. Clip “hotwire” to lightbulb and strip 1/4 in. to 1/2 in. from it.
4. Twist ends of hotwire and commo wire together.
NOTE
Insure that the stripped end of wire does not touch ground.
This will prevent a short circuit.
5. Determine if the power solenoid is functioning by engaging the cab power switch and listening for a
“click.”
6. If the solenoid is functional, cut the 645 line on the “hot” side of the pressure switch and strip 1/4 in.
to 1/2 in. of insulation from it.
CAUTION
Do not cut 645 line between the pressure switch and power
relay box.
7. Twist commo wire and pressure switch wire together.
8. If solenoid is not functional, strip a bare spot in the 625 A line at the power solenoid.
9. Twist the stripped commo wire around the bare spot.
10. Insulate all connections with electrical tape.
10-13.
PIVOT INTERLOCK SWITCH (M110 series only).
General Information:
The purpose of the pivot interlock switch is to prevent the rammer from moving until the arm is in
position.
Limitations:
Trigger lock must be in position and locked.
CAUTION
Do not use the rammer unless the swing-arm is in position.
Personnel/Time Required
●
1 soldier
●
2 minutes
CAUTION
Do not cut wire 37B (hot wire).
NOTE
Utilize existing male and female plug, if possible.
10-18
Change 1
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