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Revision A
8.6
Checking Knife Drive Belt Tension
8.6.1
Checking and Tensioning Single and Untimed Double-Knife Drive Belts
DANGER
To avoid bodily injury or death from unexpected startup of machine, always stop the engine and remove the key before
making adjustments to the machine.
IMPORTANT:
To prolong the belt and drive life, do
NOT
overtighten the belt.
1.
Shut down the engine, and remove the key from the ignition.
2.
Open the left endshield.
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A
B
C
Figure 8.7: Knife Drive
3.
Loosen two bolts (A) securing the motor assembly to the
header endsheet.
NOTE:
The belt guide has been removed from the illustrations for
clarity.
4.
Check drive belt tension. A properly tensioned drive belt (C)
should deflect 24
–
28 mm (15/16
–
1 1/8 in.) when 133 N
(30 lbf) of force is applied at the midspan.
5.
If the belt needs to be tensioned, turn adjuster bolt (B)
clockwise to move the drive motor until proper tension
is set.
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A
B
C
Figure 8.8: Knife Drive
6.
Ensure clearance between belt (A) and belt guide (B) is
1 mm (1/16 in.).
7.
Loosen three bolts (C), and adjust the position of guide (B)
as required.
8.
Tighten three bolts (C).
9.
Close the endshield.
10.
Double-knife headers only:
Repeat procedure on the other
side of the header.