8N's 3 point back up and running

I'm the one with the 8N that has a 2N top cover on it so it has no position / draft control lever on it. It's always in position control mode.

Anyway it quit lifting on me. When I pulled the top cover, I found some of the 8N parts missing of course. What I found was a bent control rod. I think the main problem was that the dowel pin was slipping off the side of the cam. Maybe due to worn parts? I'm thinking maybe that's how the control rod got bent when the pin slipped off the side of the cam and jammed things up.

Anyway, I put a longer 1" dowel pin in there that fit better over the cam. I also put some shims on the shaft with washer #351502-S. One can't find any washers that size since it's 5/8" ID and 1" OD.

What I found was machine shims in various thicknesses from Fastenal. I put two of the .050 thick shims in with that washer and it tightened things up nicely. I purchased a nice straight control rod also. Anyway I just finished buttoning it all up and my position control is functioning nicely.

I haven't tried to straighten that bent control rod yet.

Next, I'll be tackling my new MF202 workbull. It has a malfunctioning 3 point lift also.

Forgot one thing. Before removing the top cover, I ordered an upgrade NAA piston and seals. When I did remove the top cover, I found that there was an NAA piston already in it but there was only one rubber O ring. There was no leather washer to accompany the rubber ring like there is supposed to be.

Added a couple pics.

When I removed the top cover, I first took off the seat pan but left the seat spring on the cover. This gave me a place to clamp a board to the spring to use as a lifting handle. Leaving the spring on did make it a little heavier but I had two guys helping me get it off and on again. I forgot to take the pic when the seat pan was off.

In the second pic you can also see that leaving that spring on there gave me a great way to clamp the thing to my table to work on it.

Cary,

Congratulations on a successful surgery!

One of the most common mechanical faux pas' is assuming that you can just reverse your dismantling procedure for reassembly. So often one finds previous mistakes from under tightening to maladjustments to missing or incorrect parts.

Reminds me of the song and dance I went through two years ago with the Carter YF carb. accelerator discharge passage CHECK BALLS. In the end I removed the un-weighted ball (incorrect) and installed the pointed weight (like a needle valve) requiring no ball. Bingo!

Terry

(quoted from post at 20:35:34 10/21/16)
One of the most common mechanical faux pas' is assuming that you can just reverse your dismantling procedure for reassembly. So often one finds previous mistakes from under tightening to maladjustments to missing or incorrect parts.

Click to expand...

I'll second that! When I had my 8N top cover off, I could tell something wasn't right as the linkages didn't look quite the same as any of the pictures I found online. After a while I found just the right image to compare with -- someone had installed the lever that selects between position and draft control backwards so that it could not work. I'm sure someone who had taken a few apart before would have found the problem quicker, but it took me nearly a week to figure it out!

I left the tractor at 10 AM yesterday with the box blade at full height. This morning, 24 hours later, it had only dropped about 8 inches and was still about 9 inches off the ground.

Before the rebuild it would be on the ground in about 30 to 40 minutes. So I'm a happy camper. :lol: