Adjusting Knife Drive Box Squareness
1. Place a straight edge (A) along the face of the knife
drive box pulley (B) and measure a distance of
1000 mm (39-3/8 in.) between points (C) and (D).
2. Measure the distance (E) between the straightedge
and endsheet at each point (C) and (D). Check that the
measurements at (C) and (D) are within a tolerance of
+/- 3 mm (3/8 in.).
NOTE:
If the difference between measurements at
point (C) and point (D) is greater than 5 mm
(3/16 in.), install a shim.
Figure 5.60: Knife Drive Box (Top View)
3. Loosen four bolts (A) securing the knife drive box to
the frame.
Figure 5.61: Knife Drive Box
4. Manufacture a U-shaped shim (A) to
fi
t 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.
5. Refer to
Installing Knife Drive Box, page 133
for bolt
installation instructions.
6. Tighten bolts and recheck squareness.
7. Refer to
Tensioning Non-Timed Knife Drive Belts, page
for belt tensioning instructions.
Figure 5.62: U-Shaped Shim
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136
Revision A