MacDon D65 Operator's Manual page 194

9. When the belt has the proper belt tension, tighten nuts (C)
to 73–80 Nm (54–59 lbf·ft).
10. Ensure the timing belts are properly seated in the grooves
on both driver and driven pulleys.
11. Rotate the drive slowly by hand and observe where the
knives overlap at the center of the header to check for the
correct knife timing.
IMPORTANT:
The knives must begin moving at the exact same time and
must move in opposite directions.
12. Adjust the knife timing, if necessary, by loosening the right
drive belt (B) just enough to reposition it to the next cog(s)
and proceed as follows:
a. If the right knife leads the left knife, rotate the right
driven pulley (A) clockwise.
b. If the right knife lags the left knife, rotate the right
driven pulley (A) counterclockwise.
13. Ensure the drive pulleys don't rotate, and tension the right drive belts (refer to Step
IMPORTANT:
Do NOT use the adjuster bolt at the drive pulley to adjust the timing belt tension.
14. Recheck the timing (refer to Step
15. Close both endshields. For instructions, refer to
Checking Knife Drive Belt Tracking
The following procedure is applicable to the left knife drive and the right knife drive on timed drive headers.
IMPORTANT:
A belt that is not tracking properly is subject to premature failure. Ensure the pulleys are aligned and parallel. Follow the
belt tensioning procedures in this manual to avoid misalignment.
The cogged timing belt should be centered on the knife drive box pulley and at least 2 mm (0.08 in.) from either edge when
the header is running. The belt should avoid continual contact with the drive pulley flanges. Occasional contact is
acceptable. A gap should be visible between the belt and the pulley flanges.
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MAINTENANCE AND SERVICING
11, page 174) and readjust it if necessary (refer to Step
Closing Endshield, page
174
A
B
C
Figure 5.98: Right Knife Drive
7, page 173
12, page
36.
to Step 9, page 174).
174).
Revision B