MacDon A40D - Page 183

262334 165 Revision A
1024019
A
Figure 4.63: Knife Position Adjustment
3. Rotate the left knife drive box driven pulley (A) clockwise
until the left knife is at the center of the inboard stroke
(moving towards center of header).
NOTE:
Center stroke is when the knife points are centered
between guard points.
1002767
A
B
Figure 4.64: Knife Sections Centered Between Knife
and Guard Points
A - Knife Point B - Guard Point
4. Rotate the right knife drive box pulley counterclockwise
until the right knife is at the center of the inboard stroke.
NOTE:
Secure the knives to prevent movement when installing
the belts.
CAUTION
To maintain timing, the knife drive box driver and driven
pulleys must NOT rotate as the belt is tightened.
5. Install the right knife drive box drive belt and tension it.
1002764
A
Figure 4.65: Timing Belt – Right Side
6. Check that timing belt (A) is properly seated in the grooves
on both the driver and the driven pulley on the right, and is
tensioned correctly. The belt should be tensioned to a
14 mm (9/16 in.) deflection. This is achieved by applying
22–30 N (5–6.5 lbf) to the belt at midspan.
MAINTENANCE AND SERVICING