MacDon D65 Operator's Manual page 173

Adjusting Belt Tracking
The following procedure is applicable to the left side knife drive and the right side 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 0.08 in. (2 mm) 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.
To correct tracking problems, proceed as follows:
1. Open the endshields.
CAUTION
Exercise extreme care when operating the header
with the endshields open.
2. Operate the header and observe how the belt is
tracking on both the drive pulley and the knife drive
box pulley on both sides of the header.
WARNING
To avoid bodily injury or death from unexpected
startup of machine, always stop engine and remove
key before making adjustments to machine.
3. Shut down the windrower and remove key from ignition
before making any adjustments.
4. If the belt is tracking toward the inboard side of the
drive pulley, the likely cause is a toe-out problem (belt
tends to move toward the low tension side of the pulley
[inboard]). Proceed to Step
the problem.
5. If the belt is tracking toward the outboard side of the
drive pulley, the likely cause is a toe-in problem (belt
tends to move toward the low tension side of the pulley
[outboard]). Proceed to Step
the problem.
147725
MAINTENANCE AND SERVICING
7., page 160 to correct
7., page 160 to correct
159
Figure 5.83: Knife Drive Pulley
A - Toe-Out: Left Side
C - Toe-In: Left Side
B - Toe-Out: Right Side
D - Toe-In: Right Side
Revision A