MacDon A40-D Pull-Type - Manual (Page 122)

SECTION 7 MAINTENANCE AND SERVICING
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120
Revision F
TIP: If trouble is encountered cutting tangled, or
fine-stemmed material, replace guards with
stub guards.
If material is tough to cut, install stub guards with
top guard and adjuster plate. A stub guard
conversion kit for the header/mower conditioner
is available from your Dealer. Refer to Section
9.5 STUB GUARD CONVERSION KIT.
7.8.7.2 Replacing Guard
Check daily that guards are firmly bolted to the
cutterbar, and are NOT worn or broken. Replace
as required. A worn or broken guard can be
replaced without removing knife from cutterbar.
7.8.7.2.1 Replacing Pointed Guard
Refer to previous section for standard
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 (C), and
adjuster bar (D).
IMPORTANT
Ensure center guard (B) has offset cutting
surfaces. See illustrations.
NOTE
Top guide (C) must accommodate the
two overlapping knives at center
guard (B) 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 center guard (B), adjuster
bar (D), top guide (C), and install bolts. Do NOT
tighten fully.
d. Check and adjust clearance between top
guide (C) and knife. Refer to Section 7.8.8 Knife
Hold-Downs.
CENTER POINTED GUARD AND HOLD-DOWN (KNIVES STROKED FULLY OUT)
B
A
C
D
NOTE
SECTION IS NOT PRESENT
WHEN KNIFE IS STROKED OUT
INVERTED SECTION
CUTTING SURFACES ALIGNED OFFSET CUTTING SURFACES ALIGNED
NORMAL CENTER
OFFSETS