2-51. MAINTENANCE OF TURRET BEARING INSTALLATION-PLAIN BEARING UNIT
A N D O U T E R R A C E A S S E M B L Y ( C O N T ) .
Upon removal of plain bearing unit from cab, check
service record. If previous service was not conducted
within previous 18 months, conduct service of turret
Use a hoist and slings of 30,000 lb
(13,620 kg) minimum lifting capaci-
ty to prevent injury to personnel and
damage to equipment.
Check the position of the plain bear-
ing unit before removing it from the
cab assembly, The plain bearing unit
should be rotated 180 degrees from
the original position after scheduled
maintenance has been performed to
prevent uneven wear.
Scribe a reference line between the plain
bearing unit and hull before removal.
Insert crowbar in boom hinge pin upper
Provide hoist and chain slings of 30,000
lb (13,620 kg) minimum lifting capacity.
Attach chain slings to crowbar and lifting
eyes (2) on cab (3).
Using ratchet, remove 28 hexagon head
capscrews (4) and 28 Iockwashers (5).
Using hoist and chain sling, lift cab (3)
from plain bearing unit (6) and place on