TM-9-2350-311-20-2
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS
DECEMBER 1993
TM-9-2350-311-20-2 - Page 176 of 828
TM 9–2350–311–20–2
3–65
E
yes
no
Repair or replace wire 645
from cannon plug to quick-
disconnect at pressure
switch (para 8–6).
1.
Turn MASTER and CAB POWER switches to
OFF.
2.
Connect jumper wire to A and B socket holes
in cannon plug.
3.
Turn MASTER and CAB POWER switches to
ON.
Does hydraulic pump motor come on?
Remove jumper wire from
cannon plug. Replace pres-
sure switch (para 6–6).
CONTINUED FROM STEP D
yes
no
CONTINUED ON NEXT PAGE
F
CANNON
PLUG
SOCKET A
+–
1.
Turn MASTER and CAB POWER switches to
OFF.
2.
Reconnect wire 645 to quick-disconnect at
pressure switch.
3.
Disconnect cannon plug from top of pressure
switch.
4.
Turn MASTER and CAB POWER switches to
ON.
5.
Place red multimeter lead in cannon plug
socket A and black lead to ground.
6.
Check for voltage.
Is battery voltage present?
CANNON
PLUG
SOCKETS
A AND B
yes
no
Repair or replace wire 645
(para 8–2).
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