Arctic Cat 660 cc Service Manual page 240

4. Inspect the bearings for any roughness or damage.
5. Inspect the seals for any breaks or damage.
6. Inspect the track for cuts, gouges, or wear.
7. Inspect the keyways in the driven shaft for wear or
damage.
8. Inspect the brake disc for wear or cracks.
9. Inspect the track drive sprockets for wear or
damage.
10. Inspect the top sprocket for any chipped or worn
teeth.
11. Inspect the bottom sprocket teeth for wear. Turn
the inner sprocket bearing by hand and inspect for
any signs of being rough.
12. Inspect the three bottom sprocket drive pins.
Check the pin edges for chipping and wear.
13. Inspect the drive pin springs for tension by
pushing each pin into the sprocket and releasing it.
It must snap back out without any signs of
binding. If any of these items (pins, bearing,
sprocket, teeth) appear worn, replace the sprocket
as an assembly.
14. Inspect the idler gear sprocket teeth and bearings.
Rotate the inner bearings by hand. Check each
sprocket tooth for any signs of chipping and wear.
15. Closely inspect the drive chain for broken links.
16. Inspect the reverse gear. Inspect the teeth for wear
and chipping. Inspect the edges of drive pin holes
for any signs of chipping and wear.
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17. Remove the snap ring from the reverse gear.
Remove the outer thrust washer, thrust bearing,
and inner thrust washer. Inspect the thrust bearing
by placing it between the two thrust washers and
rotating the thrust washer. Rotation must feel
smooth. If any roughness is noted, replace the
thrust washers and bearing as a set.
18. Inspect the chain tightener bearing. Rotate the
tightener roller and check for smooth rotation. If
rotation feels rough, replace roller and bearing
assembly.
ASSEMBLING
1. Press the sprockets on the driveshaft noting the
scribed marks on the shaft and the timing mark
found on one tooth of each sprocket. The timing
mark is the letter T molded into the outer surface
of one drive tooth. All the T markings must be in
alignment.
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Sprocket "Timing Mark"
739-057B
0739-222
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