MacDon CA25 OM - Manual (Page 85)

SECTION 7. OPERATION
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83
Revision B
7.10 KNIFE HEAD SHIELD
The shield attaches to the endsheet, and
reduces the knife head opening to prevent cut
crop from accumulating in knife head cut-out
creating plugging.
It is recommended that the shield(s) be installed
when harvesting severely lodged crop or any
crop condition where plugging occurs at knife
head cut-out.
The shield(s) and mounting hardware are
available from your MacDon Dealer, and are
installed as follows:
IMPORTANT
Shields should be removed when
cutting with cutterbar on ground in
muddy conditions. Mud may pack
into cavity behind shield, and cause
sickle drive box failures.
NOTE
Shields are slightly different depending
on header size and guard
configuration. Ensure proper shield is
used. See Parts Catalog for proper
replacement parts.
a. Raise reel fully, lower header to ground, shut
down combine, and remove key.
CAUTION
Always engage reel props before working
under reel.
b. Engage reel arm locks.
DANGER
To avoid bodily injury or death from
unexpected start-up or fall of raised
machine, stop engine, remove key, and
engage lift cylinder stops before going
under machine.
NOTE
The knife head shield is supplied in
flattened form, and can be bent to suit
installation on pointed or stub guard
cutterbars, and on double knife
headers.
CAUTION
Wear heavy gloves when working around
or handling sickles.
c. Locate knife head shield (A) against endsheet
as shown.
d. Orient the shield so that cutout matches profile
of knife head and/or hold-downs.
e. Bend shield along slit to conform to endsheet.
f. Place shield on endsheet, align mounting holes,
and install two 3/8 in. x 1/2 Torx
® head bolts
(B).
g. Snug up bolts just enough so that shield can be
adjusted as close as possible to knife head.
h. Manually rotate sickle drive box pulley to move
knife, and check for areas of contact between
the knife head and shield.
i. If required, adjust shield to avoid interference
with the knife.
j. Tighten bolts.
A
B