Posted by Bob M on November 18, 2012 at 07:48:29 from (69.207.86.27):
In Reply to: Cam gear posted by BudKaiser on November 18, 2012 at 07:00:10:
Same thing happened to my Super M; also to a buddy's 400. Replacement heavy gear (#6760DB) is available from Carter & Gruenenwald - about $170 as I recall. Also if you get a new camshaft nut, be sure to get the one with correct thread hand! (Both right and left hand threads were used at various times).
When I got my SM apart I found the camshaft keyway badly chipped out; only one side of the key "pocket" remained. Rather than replace the camshaft I held the key tight against the good side of the keyway then tack welded it to the camshaft. I then installed the new gear and old nut as usual.
This works since the camshaft key only needs to hold the gear aligned while the nut is being tightened. Once torqued, it's friction between the gear hub and the camshaft boss that drives the camshaft - the key is now "just along for the ride".
Be sure to purchase/install a new camshaft nut keeper too so the nut doesn't come of again! Also I used Locktite Red Threadlocker (#271?) on the camshaft threads as added insurance.
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Can't help you with the cam gear thrust plate. Mine showed only slight wear. So I left it as is.
Since I did the repair that ominous knock from the front end disappeared. That was about 10 years ago; tractor still runs perfectly!
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