Section II. MAINTENANCE OF THE BOOM FRAME AND DRILL GUIDE ASSEMBLY
5-8.
Slabback Replacement
a. Removal.
(1) Remove drifter drill (see paragraph 5-7).
(2)
Fully loosen chain (see paragraph 5-13).
(3)
Remove three screws (1) and lockwashers
(2). Remove chain mounting block (3) from slabback
(4). Discard lockwashers.
(4)
Remove four locknuts (5) and bolts (6)
securing slabback (4), four shims (7), and two side rails
(8) to feedshell (9). Remove slabback. shims, and side
rails. Discard locknuts.
(5)
Remove two cotter pins (10) from each
master link (11). Separate master links and remove
from chain mounting block (3). Discard cotter pins.
b.
Installation.
(1)
Connect two master links (11) on feed
chain (12) to chain mounting block (3). Secure using
four new cotter pins (10).
(2)
Install slabback (4), four shims (7). and
two side rails (8) on feedshell (9) using four bolts (6) and
new locknuts (5).
(3)
Measure clearance between side rails (8)
and flange on feedshell (9). If clearance is greater than
1/8 in.16 remove thinner shim and remeasure. Adjust
shims until clearance is 1/8 in. or less.
(4)
Install
chain
mounting
block
(3)
on
slabback (4) using three bolts (1) and new lockwashers
(2).
(5)
Install drifter drill (see paragraph 5-7).
(6)
Adjust chain (see paragraph 5-11: ).
5-9.
Centralizer Replacement and Repair
a.
Removal.
(1)
Release latch bolt (1) from two centralizer
blocks (2).
(2)
Remove bolt (3), lockwasher (4), and pin
(5) securing each centralizer block (2) to mount (6).
Remove two blocks from mount. Discard lockwashers.
b.
Disassembly.
(1)
Remove locknut (7), flatwasher (8), spring
(9), and beveled washer (10) from latch bolt (1’,. Discard
locknut.
(2)
Remove lubrication fitting (11) from each
centralizer block (2).
c.
Assembly.
(1)
Install lubrication fitting (11) in each
centralizer block (2).
(2)
Install beveled washer(10), spring (9), and
flatwasher (8) on latch bolt (1). Secure with new locknut
(7). Do not fully tighten locknut.
d.
Installation.
(1)
Install each block (2) on mount (6) using
pin (5), new lockwasher (4), and bolt (3).
(2)
Lubricate centralizer (LO 5-3820-241-12).
16
