MacDon A40-D Pull-Type - Manual (Page 123)

SECTION 7 MAINTENANCE AND SERVICING
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121
Revision F
7.8.7.2.2 Replacing Stub Guard
Refer to previous section for typical
guard replacement.
The guard near the center of the double knife
header, where the two knives overlap, requires a
slightly different replacement procedure.
IMPORTANT
Replace adjacent guards when replacing
center guard.
a. Remove two nuts (A) and bolts that attach
center guard (B) and top guide (C) to cutterbar.
b. Remove guard and top guide and adjuster
bar (D).
IMPORTANT
Ensure center guard (B) has offset cutting
surfaces. See illustration.
NOTE
Top guide (C) (which is an inverted stub
guard) must accommodate the two
overlapping knives at center guard
location on double knife header. Ensure
replacement is correct part.
IMPORTANT
Ledger surfaces of center and adjacent
guards must be vertically aligned to avoid
interference with knife sections.
c. Position replacement guard (B), adjuster bar (D),
top guide (C), and install bolts and nuts (A).
Do NOT tighten.
d. Check and adjust clearance between hold-down
and knife. Refer to Section 7.8.8 Knife
Hold-Downs.
CENTER STUB GUARD AND HOLD-DOWN (KNIVES STROKED FULLY IN)
D
A
B
TOP GUIDE (C) IS AN
INVERTED STUB GUARD
C
OFFSET CUTTING SURFACES ALIGNED CUTTING SURFACES ALIGNED
INVERTED SECTION
NORMAL CENTER