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 178 of 552

TM 9-2350-311-34-2

5-4 CANNON TUBE - CONTINUED

c. Installation - Continued

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To install breech ring machine key (2), loosen cap screw (1). Slide breech ring machine key downward into

slot (3) and tighten cap screw.

Charge recuperator assembly (TM 9-2350-311-20-2).

Remove l-beam trolley (7), gun tube sling (6), and chain-type pipe wrench (10) or 4 x 4 inch wooden block

from cannon tube (5). Remove fabricated breech stand (8) from under breech ring (9).

Cannon assembly will not be fired until cannon tube and breech ring are properly assembled, alined

and adjusted.

inspect position of breech ring machine key (2). Breech ring machine key should fill all but the rounded end

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of the slot. This is difficult to see with cannon assembly installed in mount; feel with little finger to make sure.

After anew M284 cannon assembly or its machine key has been installed, a zone 6 charge must be

fired to mate machine key and the cannon tube. Failure to follow this procedure could result in equip-

ment damage.

NOTE

After cannon assembly replacement, all fire control components must be checked for alinement

(TM 9-2350-311-20-2).

Adjustment of operating cam roller clearance is required after cannon assembly replacement

(TM 9-2350-311-20-2).

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