MacDon D65 Operator's Manual page 197

Adjusting Drive Belt Tracking – Knife Drive Box Pulley
The following procedure is applicable to the left knife drive and the right knife drive on timed drive headers.
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 also avoid constant contact with the flanges on the drive pulley but occasional
contact is acceptable. A gap should be visible between the belt and the pulley flanges. Before adjusting the drive belt
tracking, verify the pulley that needs to be adjusted. For instructions, refer to
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.
1. Open both endshields. For instructions, refer to
CAUTION
Exercise extreme care when operating the header with the endshields open.
2. Loosen nuts (A) and (B) and move the bracket and idler
until the belt is loose.
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MAINTENANCE AND SERVICING
Figure 5.103: Knife Drive – Right Side
Opening Endshield, page
Figure 5.104: Knife Drive
177
D
C
B
Checking Knife Drive Belt Tracking, page
35.
A
174.
B
A
Revision B