5.4.2 Tensioning Timed Knife Drive Belts
The procedure for tensioning timed knife drive belts is the same for both sides of the header. The illustrations
shown are for the left side—the right side is opposite.
IMPORTANT:
To prolong belt and drive life, do
NOT
over tighten belt.
IMPORTANT:
Do
NOT
use the adjuster bolt at the drive pulley to adjust timing belt tension.
1. Open the endshield.
2. Loosen two nuts (A) enough to allow the idler
pulleys (B) to pivot.
Figure 5.7: LH Knife Drive
3. Thread
fl
ange nut (C) down adjuster bolt (B) to push
the bracket (A) up.
NOTE:
Tension is checked at midspan of the belts. The
belts should de
fl
ect 20 mm (3/4 in.) with 89 N
(20 lbf) of force applied to belt.
Figure 5.8: LH Knife Drive
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Revision A
