TM-9-2350-311-34-2
CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS HOWITZER, MEDIUM, SELF-PROPELLED, 155MM
TECHNICAL MANUAL; DIRECT AND GENERAL SUPPORT MAINTENANCE MANUAL
SEPTEMBER 1994
TM-9-2350-311-34-2 - Page 37 of 552
TM 9-2350-311-34-2
b.
Traversing System. The cab traversing system consists of a traversing mechanism (11) and bypass valve assembly
(12). The traversing mechanism is driven by a fixed-displacement hydraulic motor (13) through either an electrically
operated clutch (14) (M109A2/M109A3 howitzers) or a hydraulic clutch (15) (M109A4/M109A5 howitzers). Hydraulic
pressure is transmitted through a solenoid-operated clutch valve (16) to the hydraulic clutch in M109A4/M109A5 how-
itzers. In the event of solenoid or electrical control circuit failure, the clutch valve can be operated manually to activate
hydraulic pressure. The bypass valve assembly, when activated by the gunner, allows only manual operation of tra-
versing mechanism. A manual traverse handwheel (17) is used to operate the traversing mechanism manually.
1-17
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