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8-30 6. Inspect the track for cuts, gouges, or wear. 7. Inspect the keyways in the driven shaft and the brake hub 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. AI019 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. 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. Secure the hub to the brake disc with six socket- head cap screws (coated with red Loctite #271) and lock nuts. Tighten lock nuts to 0.4 kg-m (36 in.-lb). AF445 2. 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. NOTE: Sprocket style will vary from model to 0728-351 0727-829 |