Simplicity CFC Series Operator's Manual page 47

Adjustments
SPROCKET ALIGNMENT
To minimize drive chain and sprocket wear, it is importantto
check for proper sprocket alignment. If there is side wear on
sprockets or cupping of gear teeth, sprockets may be
improperly aligned. Make the following check if chain or
sprocket wear is noticed.
Squareness of Axle Plate Spindle
The welded spindle must be checked for squareness with the
ground and frame by following these steps (refer to figure
29):
1. Check that the spindle is parallel with the ground by
looking at spindle from front and rear directions.
Washers (15/16" O.D.. 15/32" I.D.) should be added in
equal number at the top or bottom mounting hole
locations between the axle plate and frame until parallel.
2. Check that the spindle is perpendicular to the frame by
looking directly down at the spindle from above.
Washers should be added in equal number to the left or
right mounting hole locations until perpendicular.
3. If washers are to be added, remove the two mounting
bolts installed, add washers to the appropriate corners
and reinstall four mounting bolts and hardware. Note
that there may be an unequal number of washers from
corner to corner if washers are added to both
top/bottom and left/right to square spindle. Move the
axle plate to the top of the slotted holes on frame and
tighten mounting bolts securely.
45