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John Deere 316 Rear PTO Shaft Too Short

4091 Views 14 Replies 3 Participants Last post by  bloodrunsgreen
Recently purchased an '88 Deere 316 with a mower and tiller. Mows great but the pulleys to run the tiller didnt spin when I purchased it and managed to use that to bargain what I thought was a reasonable price. Went to see what the problem may be and the shaft on the rear PTO assembly doesnt seem to reach far enough to engage the splines on the stub shaft of the PTO drive. The shaft is short by about a half inch. With the mounting plate unbolted I can get the shaft to engage but the holes on the mount plate then are way off and everything is out of line.

The rear drive pulleys have a bunch of shims (7 of them) to get the rear pulleys closer to the tractor.

Is there some type of shim set up inside the clutch that needs to be shimmed more to space that shaft in the clutch closer to the splined shaft on the drive?

Pic showing the gap between the shaft and splined stub.


The rear pulleys are shimmed up between the pulleys and rear piece of the mount bracket and line up good with the pulleys on the tiller when its mounted, is there away to get this assembly closer to the front of the tractor?


Any help is much appreciated guys! Thanks in advance!
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How was the rear mounting plate (by pulleys) attached to the rear of the tractor? There has to be something to give support and for tension on the pulleys. I believe that is where your issue lies.

I found this which shows pulleys/mounting bracket, which has to bolt to the rear axle of the 316, just like the gearbox of the 2000 RPM PTO.


More investigation, downloaded all the Owners Manuals for the 30 Hydro Tiller, to find that yours was originally for the 420/430 with rear PTO option, I have attached the pdf


That is something new in the design. My originals has the splines start at all most the outer edge and a replacement some 11 years ago was the same way.
When in doubt, get a new one from OEM, that way there can be no question about it. Just make sure that you support the clutch when pushing the shaft out with a press and insert the new. It is very easy to destroy the spring tensioners of the clutch
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