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Revision B
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Figure 5.63: Knife Drive Box
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Top View
3.
Place a straight edge (A) along the face of knife drive box
pulley (B) and measure a distance of 1000 mm (39 3/8 in.)
between point (C) and point (D).
4.
Measure distance (E) between the straight edge and the
endsheet at point (C) and point (D). Check that the
measurements at point (C) and point (D) are within a
tolerance of +/- 3 mm (1/8 in.).
NOTE:
If the difference between measurements at point (C) and
point (D) is greater than 5 mm (3/16 in.), install a shim.
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Figure 5.64: Knife Drive Box
5.
Loosen four bolts (A) securing the knife drive box to
the frame.
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Figure 5.65: U-Shaped Shim
6.
Manufacture a U-shaped shim (A) to fit under the side bolts
securing the knife drive box to the frame. Place the shim
between the header mount and the knife drive box. Shim
the drive box as required to align the pulley.
7.
For bolt installation instructions, refer to
.
8.
Tighten bolts and recheck squareness.
9.
For belt tensioning instructions, refer to
Tensioning Untimed Double-Knife Drive Belts, page 160
Adjusting Knife Drive Box Fore-Aft
Perform this procedure if there is contact between the guard and the knife bar, or if adjustments have been made to the
alignment tab.
1.
Identify the location of contact between the guard and the knife bar to determine which direction to move the knife
drive box.