MacDon CA25 OM - Manual (Page 128)

SECTION 8. MAINTENANCE AND SERVICING
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126
Revision B
8.8.2 Auger Drive Chain Adjustment
The auger is chain-driven from adapter drive
system by a sprocket that is attached to side of
the auger.
To adjust chain tension, proceed as follows:
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 combine from adapter. Refer to Section
7.3 HEADER ATTACHMENT/DETACHMENT.
b. Remove six bolts (A), securing top cover.
c. Remove six bolts (B) securing bottom cover.
d. Hinge covers (C) and (D) forward, and remove
to expose drives.
e. Loosen bolt (E) securing idler sprocket.
f. Rotate auger in reverse to take up slack in
lower strand of chain (F).
g. Push idler sprocket down to eliminate remaining
slack in upper strands.
h. Rotate auger back and forth to check slack, and
repeat above step if necessary. A slight
amount of slack is acceptable.
NOTE
Do NOT use excessive force on idler
to tighten chain.
i. Tighten idler bolt (E), and torque to 215 ft·lbf
(290 N·m).
j. If necessary, lubricate the chain with SAE Multi-
Purpose High Temperature Extreme Pressure
(EP2) Performance With 1% Max Molybdenum
Disulphide (NLGI Grade 2).
k. To re-install covers (C) and (D), engage inboard
lip of cover into auger tube and rotate cover
back to engage rear support.
l. Replace and tighten bolts (A) and (B).
C
A
B
A
A
D
B
F
E