MacDon CA25 OM - Manual (Page 129)

SECTION 8. MAINTENANCE AND SERVICING
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Revision B
8.8.3 Auger Drive Chain Replacement
The chain tensioner can only take up slack for a
single pitch. When the chain has worn or
stretched beyond the limits of the tensioner, the
chain should be replaced, or removed to
replace the connector link with an offset half
link.
CAUTION
Stop engine, and remove key from ignition
before leaving Operator's seat for any
reason. A child or even a pet could engage
an idling machine.
a. Detach header from combine. Refer to Section
7.3 HEADER ATTACHMENT/DETACHMENT.
b. Remove auger chain case. See previous page.
c. Remove chain as follows:
1. Loosen idler sprocket bolt (A), and raise to
uppermost position to release tension on
chain (B). Snug up bolt (A) to hold
sprocket.
2. Grind off head of a link rivet (C) on chain
(B), punch out the rivet, and remove chain.
d. Install new chain as follows:
1. Grind off the head from one of the link
rivets on the new chain, and punch out rivet
to separate the chain.
2. Feed new chain (D) around drive and
driven sprockets and under idler sprocket.
Position chain ends so that connection can
be made on driven sprocket (E).
3. Install connector link at (F). Refer to
Section 8.3.2 Roller Chain Installation.
e. Tighten chain. Refer to Section 8.8.2 Auger
Drive Chain Adjustment.
f. Lubricate the chain with SAE Multi-Purpose
High Temperature Extreme Pressure (EP2)
Performance With 1% Max Molybdenum
Disulphide (NLGI Grade 2).
g. Re-install chain case. See step j. on previous
page.
F
D
E
B
C
B
A