New pin for the rear flywheel

[BigBill]

Thinking out of the box again I’m thinking a piece of ground round stock Thompson shaft it’s case hardened. Maybe flatwashers and cotter pin on each end to holt it in. The dimension says 8.00 mm. It’s 60 c Rockwell hardened. If the pin made out of Thompson shaft 60 c Rockwell hardened if it’s a snug fit used in shear were golden.

https://www.mscdirect.com/product/details/60226909

[mozer71]

Does it really have to be that hard ? I thought the hard shoulder bolts were a good idea but maybe extended too far, compared to the heavy split pin. I wonder about a split pin sometimes. For this torque application, the split would aim radially as to not compress.

[mozer71]

Let's say the Split pin, compresses at any orientation. A pin could be driven through it. The pin is a nail. The nail is soft metal which could be removed from the Split pin later.

[BigBill]

With every tractor I look at the split pin has been replaced with a bolt. It ain’t working out with a split pin. I ordered Thompson shaft to test next. In a shear application a solid steel pin should better.

[mozer71]

Hi Bill. I'm glad you happen to be online. The "nail" would have to be cut to fit just inside the roll pin, so it could be pressed out when the roll pin would come out. I was thinking a narrow "C" clamp type press but that is over now. You already know about this and bought the size material. When cutting grooves for lock rings, Kaiser "ThinBits are excellent. They are ground in every possible width for lock rings. When you mention the width you need, I'll send you some.

[BigBill]

What I’m thinking about is my future fel/Backhoe project. I don’t want that pin to be a weak link. My buddy said I couldn’t build a fel/backhoe from a 154. After seeing what a cub cadet 147 with a fel could do I was shocked at the amount of dirt i moved. For little jobs nothing big.

I want a mortgage free tractor with no $60 k bill. My son the engineer is working with me.

[mozer71]

Dad could've bought a Mercedes. He bought a Plymouth. He could have gone extreme at what he wanted and left the family in debt. He had to compromise all along for sake of us kids. He left us with security and ability to mature into functioning adults with futures.

[BigBill]

My kids are grown up, it’s my turn now.

[mozer71]

Right On! I'm learning a lot from your experiences and don't want to complicate the procedures. So we have a conversation here and it is good.

[john2189]

Bill,

I don’t know what size the shaft is , or the outside diameter of the hub on the flywheel is. But check this out . Its a keyless bushing that holds very well. We had a large machine at work that kept shearing 1-1/4 inch keys on the shaft for the gears .our bearing salesman guaranteed this to work, and it did. It’s in McMaster Carr. Part number 2328k12 that’s for a 1 inch shaft, but there are other sizes. You would have to bore the flywheel hub.this would eliminate the pin. It’s a bit expensive,but if it woul fit, you would never have to worry about it ever again

[john2189]

Bill,

I don’t know what size the shaft is , or the outside diameter of the hub on the flywheel is. But check this out . Its a keyless bushing that holds very well. We had a large machine at work that kept shearing 1-1/4 inch keys on the shaft for the gears .our bearing salesman guaranteed this to work, and it did. It’s in McMaster Carr. Part number 2328k12 that’s for a 1 inch shaft, but there are other sizes. You would have to bore the flywheel hub.this would eliminate the pin. It’s a bit expensive,but if it woul fit, you would never have to worry about it ever again

Edit....
Ok after looking at the pic of it on Hamilton bobs sight, I didn’t realize that it had a pilot bushing, so unless it could be put in from the trans side, probably won’t work

[BigBill]

The 8 mm Thompson shaft is perfect but needs to be threaded on both ends of the pin.

We must be able to tighten the pin on the flywheel so it compresses on the outside of the shaft. Otherwise we will have that flywheel rattle.

My son found a 8 mm shoulder bolt that’s 30 mm long, and is already threaded to 8 mm 1.25 on the end, I just ordered some. I want to see the fit in the 8 mm hole.

https://www.mcmaster.com/90782a125

One day shipping from my boys in jersey. Then we need to decide on Thompson shaft or the shoulder screw. Which fits better. My number 1 int154 has that flywheel rattle. I’m sure it has a bolt installed without looking at it.

[BigBill]

Bill,

I don’t know what size the shaft is , or the outside diameter of the hub on the flywheel is. But check this out . Its a keyless bushing that holds very well. We had a large machine at work that kept shearing 1-1/4 inch keys on the shaft for the gears .our bearing salesman guaranteed this to work, and it did. It’s in McMaster Carr. Part number 2328k12 that’s for a 1 inch shaft, but there are other sizes. You would have to bore the flywheel hub.this would eliminate the pin. It’s a bit expensive,but if it woul fit, you would never have to worry about it ever again

Edit....
Ok after looking at the pic of it on Hamilton bobs sight, I didn’t realize that it had a pilot bushing, so unless it could be put in from the trans side, probably won’t work

The right way would be a key with a double set screw but they used a spirol pin that can wear and walk out? The flywheel isn’t captured on the shaft.

My fcub drive shaft is no better it has a dark ring outer circle where it first cracked at the tranny and a lighter center circle where it finally cracked, this problem of the drive shaft flexing is next. It needs a support of some type in the drive shaft tube.

Thanks for your input any help or suggestions is good. This is a weird setup. The heavy duty spirol pin just doesn’t hold up nor does the threaded bolt replacement. I think we’re on the right path now,

[BigBill]

Right On! I'm learning a lot from your experiences and don't want to complicate the procedures. So we have a conversation here and it is good.

We all in this group have become problem solvers in repairing old iron. Everyone’s input and suggestions are needed. I worked as a mechanic since my younger years, them as a Class A machine tool builder. I also rebuilt machine tools. I ended up as a 20 year lead engineering tech on the r&d test lab floor. I past on my real world experiences to many engineers. Now I’m retired and doing my own thing.

[mozer71]

I do appreciate that and the fine bolt you found for us.