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 806 of 828

TM 9–2350–311–20–2

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Change 2

WARNING

The cannon tube must be blocked during cleaning to prevent cannon tube from returning to battery

resulting in injury to personnel.

CAUTION

Do not use abrasives other than crocus cloth when cleaning to prevent damage to the buffer piston

rod.

7

Block cannon tube (2) while out of battery with a 4”x4”x12” wooden block (29). Hold wooden block in posi-

tion and slowly release pump pressure until wooden block stops cannon tube movement. Rub crocus cloth

soaked with hydraulic fluid (item 21, Appx D) in a longitudinal direction, along the buffer piston rod (28) to

remove all discoloration.

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