MacDon CA25 OM - Manual (Page 135)

SECTION 8. MAINTENANCE AND SERVICING
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Revision B
8.9.6 Sickle Guards
Check daily that guards are aligned to obtain
proper shear cut between sickle section and
guard. Sickle sections should contact shear
surface of each guard.
8.9.6.1 Guard Adjustment
To align guards, proceed as follows. The guard
straightening tool (MD #140135) is available
from your MacDon Dealer.
a. To adjust guard tips upward, position tool as
shown, and pull up.
b. To adjust tips downward, position tool as
shown, and push down.
TIP: If trouble is encountered cutting tangled, or
fine-stemmed material, replace lower guards
with stub guards, and install a sickle hold-down
on every guard.
c. If material is tough to cut, install stub guards
with top guard and adjuster plate. A kit is
available from your MacDon Dealer. Refer to
Section 10.2 STUB GUARD CONVERSION
KIT.
8.9.6.2 Guard Replacement
CAUTION
Always engage reel props before working
under reel.
Pointed Guards: Single Knife
a. Stroke sickle so that sickle sections are spaced
midway between the guards.
b. Remove two nuts (A) and bolts that attach
guard (B) and hold-down (C) (if applicable) to
cutterbar.
c. Remove guard, hold-down, and poly wear plate
(if installed).
d. Position new guard and poly wear plate (if
applicable) on cutterbar, and install carriage
bolts.
IMPORTANT
The first four outboard guards on
drive side(s) of header do not have
a ledger plate. Ensure that proper
replacement is installed.
e. Install hold-down, and secure with nuts.
Tighten nuts to 50 ft·lbf (68 N·m).
f. Check and adjust clearance between hold-
down and sickle. Refer to Section 8.9.7 Sickle
Hold-Downs.
DOWNWARD ADJUSTMENT
DRIVE SIDE NORMAL END
C
A
B
UPWARD ADJUSTMENT