TM-9-2350-311-10
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; OPERATOR’S MANUAL
NOVEMBER 1994
TM-9-2350-311-10 - Page 77 of 775
TM 9-2350-311-10
1-14
EQUIPMENT OPERATION AND DESCRIPTION - CONTINUED
1-14.11 Cab Traversing System
a.
b.
c.
d.
e.
f.
g.
GUNNER’S SELECTOR SWITCH BOX ASSEMBLY. The gunner’s selector switch box assembly (1) TRAVERSE
CONTROL switch allows either power or manual traverse of cab while the CAB POWER switch is to ON.
MAIN ACCUMULATOR AND POWER PACK ASSEMBLY. The main accumulator (2) and power pack assembly
(3) deliver hydraulic power to cab components through a network of lines and control valves.
BY-PASS VALVE ASSEMBLY AND SOLENOID. The by-pass valve assembly and solenoid (4) direct hydraulic
flow to allow manual or power traversing.
TRAVERSING MECHANISM. The traversing mechanism (5) traverses the cab by hydraulic power or mechanical
energy. Clutch mechanism controlled by gunner’s selector switch box assembly (1) disengages manual gears and
allows power traversing.
GUNNER’S CONTROL ASSEMBLY. The gunner’s control assembly (6) receives hydraulic power from the power
pack assembly (3) and uses the power to either traverse the cab right and left, or elevate or depress the gun.
MANUAL TRAVERSE HANDWHEEL. The manual traverse handwheel (7) allows manual traverse of cab.
CLUTCH VALVE (M109A4/M109A5 ONLY). The clutch valve (8) allows power traversing in the event of electrical
failure by activating the clutch valve manually.
Change 2
1-39
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