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5. If the belt (A) is tracking to one side of the knife drive
box pulley (B), the likely cause is an out of position idler
pulley (C). Proceed to Step
.
Figure 5.99: Knife Drive Belt
6. If there is a tracking problem on the drive pulley, adjust
the position of the cross shaft support tube as follows:
a. Loosen nut (A) on the support assembly (B).
b. To correct a toe-out condition, slide the support
assembly (B) rearwards in slot (C).
c. To correct a toe-in condition, slide the support
assembly (B) forward.
d. Tighten nut (A).
e. Operate the header and check the belt tracking.
Adjust the support assembly as required.
f.
If belt tracking problems continue, proceed to
Step
Figure 5.100: Cross-Shaft Support
7. Correct a tracking problem on the knife drive box pulley
by adjusting idler positions as follows:
a. Loosen jam nuts (A).
b. Loosen jam nut and adjuster bolt (B) to relieve belt
tension.
c. Turn bolts (C) and (D) clockwise to move belt
inboard,
or counterclockwise to move belt
outboard.
NOTE:
Bolts must touch the endsheet to prevent
vibration.
d. Check that belt does not ride against
fl
anges on
pulley (E).
e. Tighten jam nuts (A).
f.
Tension the belt. Refer to
.
g. Operate the header and check the belt tracking.
Figure 5.101: Knife Drive – Left Side
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