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 hex nuts (A) enough to allow the idler
pulleys (B) to pivot.
Figure 5.7: LH Knife Drive
3.
Pull the idler pulley (A) as high as possible by hand.
4.
Thread flange nut (B) down adjuster bolt (C) to achieve
final tension.
NOTE:
Tension is checked at mid-span of the belts. The
belts should deflect 11/16–14/16 in. (18–22 mm)
with 20 lbf (89 N) of force applied to belt.
Figure 5.8: LH Knife Drive
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58
Revision A
