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 179 of 828
TM 9–2350–311–20–2
3–68
3–3
TROUBLESHOOTING — CONTINUED
e.
CAB HYDRAULIC SYSTEM — CONTINUED
(1)
POWER PACK HYDRAULIC PUMP MOTOR
DOES NOT OPERATE, BUT CAB LIGHTING
SYSTEM OPERATES NORMALLY. — CON-
TINUED
1.
Turn MASTER and CAB POWER switches to
OFF.
2.
Reconnect wire 104 to power relay box
assembly.
3.
Remove distribution cover from power relay
box assembly (para 8–13).
4.
Turn MASTER and CAB POWER switches to
ON.
5.
Place red multimeter lead on output bus bar
of circuit breaker and black lead to ground.
6.
Check for voltage.
Is battery voltage present?
CIRCUIT
BREAKER
+
–
Low voltage in battery can cause points to stick
on the power relay. Check battery voltage prior
to doing step J (TM 9–2350–311–20–1).
NOTE
NBC control box assembly must be removed to
open cab power relay box assembly in
M109A4/M109A5 howitzers (para 17–4).
CONTINUED FROM STEP I
J
yes
no
CONTINUED ON NEXT PAGE
Replace circuit breaker
(para 8–13).
CAUTION
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