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 59 of 552
TM 9-2350-311-34-2
Functional group and part
09
Traversing mechanism
Number of Variations
2
How assemblies/parts differ
M109A4/M109A5 howitzers have
modified traversing mechanisms.
The electric clutch has been re-
placed by a hydraulic clutch. The
brush assembly has been elimi-
nated, and a clutch valve replaces it.
A different handwheel is also used.
10
Cover assembly, commander’s cupola
2
Some M109A3 howitzers have cov-
er with outside locking latch. Some
M109A3 howitzers and all M109A2
howitzers have no outside latch.
1-16 EQUIPMENT DATA
Tabulated data concerning the M185/M284 cannon assembly, M178/M182 mount, equilibrated system, rammer, and equil-
ibrated elevating cylinder can be found below. Data following applies to both mount and cannon configurations unless
otherwise specified. This is supplemental to data contained in TM 9-2350-311-20-2.
M185/M284 CANNON ASSEMBLY
Bore diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155 mm
Center ofgravity oftube/barrel assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93.87 in. (238cm) (M185)
(forward from rear of tube)
113.37 in. (288 cm) (M284)
Center of gravity of cannon/cannon assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.12 in. (249 cm)(M185)
(complete from rear face of breech ring)
102 in. (259 cm) (M284)
Length:
Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
238.5 in. (605.8 cm) (M185)
240 in. (609.6 cm) (M284)
Cannon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
271.38 in. (689 cm) (M185)
274.12 in. (696 cm) (M284)
Weight:
Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3166 lb (1436 kg)
Muzzle brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
350 lb (159 kg)
Evacuator chamber (approx) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 lb (34kg)
Cannon (complete) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4320 lb (1960kg) (M185)
4390 lb (1991 kg) (M284)
1-39
Back to Top
