Sewing Machine Nut: 1986 John Deere 650 Tractor

Thursday, June 29, 2023

1986 John Deere 650 Tractor - New Loader Mounting Pins

Here's a quick post about the pins I made for the loader. I had to drill out the old pins, as they were purt-near welded in place, it seemed. I found a two-foot chunk of 1-1/4" diameter round bar in the basement that I cut two 7-1/2" chunks from.

My Smithy 1340 lathe spindle through-hole wasn't large enough to accommodate the bars, so I used a live center on the right end to keep the bars from flexing too much while cutting so far from the chuck. I turned down the smaller diameter first, to about .900".

I was messing around with my Samsung phone camera and took this super-slo-mo video. It's a .025" depth of cut and .020" feed rate.

The larger end was turned down to about 1.140". The first pin completed fits quite well (below). I should jump in here and mention I had to bend the piece that the small end of the pin goes through back into shape, as it was deformed while trying to get out one of the old pins. Fortunately the Harbor Freight hydraulic press got the job done without too much difficulty.

You can kind of see the far bushing in the photo below is not parallel with the closer hole. The bolt poking through the far hole shows the axis of the hold and is pointing to the left.

This next photo shows the two bushing holes are lined up fairly well. Close enough for tractor work.

Both pins are done. Well, I thought they were, until I test-fit them into the loader's bushings. Come to find out, the larger bushing's internal diameter in the loader frame is one diameter at the outside end of the bushings, then steps down about 1/16" smaller diameter an inch in from the outside. I have no idea why John Deere (or Yanmar) made that step. I'm wondering if that's why the old home-made pins were stuck so tight in the frame. I had to chuck up my new pins again and turn a smaller diameter, as shown two photos down. It's the stepped area at the center of the pin.