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 97 of 552
TM 9-2350-311-34-2
c. CAB TRAVERSING SYSTEM
The cab traversing system consists of the gunner’s selector switch box assembly, hydraulic motor, bypass valve assembly
and solenoid, clutch mechanism, and gunner’s control handle. The M109A4/M109A5 howitzers have an additional clutch
valve.
The gunner’s selector switch box assembly is used to electrically switch the cab traversing mechanism between power and
manual traversing.
The bypass valve assembly and solenoid combination controls the hydraulic power between the manual and power
modes. In the power mode, the solenoid will push out the plunger to divert the hydraulic fluid to the hydraulic motor. In the
manual mode, the plunger will retract and disengage the hydraulic motor.
The clutch mechanism controls the mechanical switching between the two modes and is controlled electrically
(M109A2/M109A3 howitzers) or hydraulically (M109A4/M109A5 howitzers). The clutch valve in the M109A4/M109A5
howitzers controls the flow to the clutch.
The gunner’s control handle operates the power traversing of the cab and the handwheel assembly operates the manual
traversing of the cab.
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