Posted by Pete P. on March 27, 2012 at 18:30:43 from (65.189.199.106):
I have a "47 Farmall Cub whose primary duty is to run a Woods 5 ft. belly mower. For the past decade or so she"s been our regular (and only) mower. Late last fall the PTO threw itself out; upon dissasembly I found the shift lever ground nearly off where it goes into the PTO shaft shift collar. Replaced shift lever but it was too late in the season to run her again.
Spring has come early here in NW Penna. (as it probably has in most of the country) so time to cut grass once again. The poor Cub only made it about three minutes before the PTO threw out again and sure enough the brand new shift lever is ground off same as last fall.
I doubt lubrication is the issue as the trans. is full of fresh GL-4 SAE 90; even if inadequate oil were in there, 3 min. to failure???
There is no visible wear in the groove of the shift collar. Collar fits on PTO shaft without abnormal wiggle. PTO shaft splines look straight, no shaving of the points. Trans. output shaft splines are straight except for the last 1/16" or so where the leading edge is tapered very slightly in; the OD of the splines is uniform throughout their length however. I"m not sure if this taper is factory spec. or due to wear but it appears minor. There is negligible end play of the PTO shaft in its bearing and there appears to be no end play on the trans. output shaft; no lateral freedom of movement on either shaft. Collar was replaced with new shift lever and internal splines still look brand new (old collar looks fine too, but replaced just incase.) With collar removed and PTO shaft inserted into trans. shaft there is a good 1/4" maybe more of distance between the body of the two shafts -- not sure what spec is.
Questions -- What the heck do I do? I would think the two shafts would run tighter together than they do. the collar can only grab 1/4 inch or so of the trans shaft splines I would think, but if this isn"t spec then how did the shafts move? surely something is forcing the collar rearward from the engaged position to the released position and that poor little shift lever just can"t resist for long ... but what?
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