MacDon D65 Operator's Manual page 175

8. To correct the tracking problem on the knife drive box
pulley, adjust the position of the idler as follows:
a. Loosen nuts (A) and (B) and move bracket and
idler until belt is loose.
b. Remove nut (B) securing idler to bracket, and
remove lock washer, idler pulley, and flat washer.
c. Install the idler pulley (C), ensuring it lines up with
the knife drive box pulley, using flat washer(s) (D)
as required.
d. Reinstall lock washer (E) and nut (B).
e. Tension the belt. Refer to
Drive Belts, page
f. Operate the header and check the tracking.
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MAINTENANCE AND SERVICING
Tensioning Timed Knife
155.
Figure 5.86: Knife Drive
161
Revision A