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 60 of 828
TM 9–2350–311–20–2
1–29
1–18.4
Cab Traversing System
a.
GUNNER’S SELECTOR SWITCH BOX ASSEMBLY. The gunner’s selector switch box assembly (1) has positions
for
either power or manual traverse of cab.
b.
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.
c.
BY-PASS VALVE ASSEMBLY AND SOLENOID. The by-pass valve assembly and solenoid (4) direct hydraulic flow to
allow manual or power traversing.
d.
TRAVERSING MECHANISM. The traversing mechanism (5) traverses the cab by hydraulic power or mechanical en-
ergy. Clutch mechanism controlled by gunner’s selector switch box assembly (1) disengages manual gears and allows
power traversing.
e.
GUNNER’S CONTROL HANDLE. The gunner’s control handle (6) receives hydraulic power from the power pack as-
sembly (3) and uses the power to either traverse the cab right and left, or elevate or depress the gun.
f.
MANUAL TRAVERSE HANDWHEEL. The manual traverse handwheel (7) allows manual traverse of cab.
g.
CLUTCH VALVE (M109A4/M109A5 ONLY). The clutch valve (8) allows power traversing in the event of electrical fail-
ure by activating the clutch valve manually.
1
4
6
5
8
7
2
3
RETURN
(0 PSI)
SUPPLY
(900 PSI)
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