Broken Crank

[BTDT]

Glad your mechanic caught it this time before the install. Makes you wonder how many others out there. Hopefully you'll have your tractor repaired and back to you soon.

 

[HoyeTractor]

I looked at our cranks last night & they do all have the same marking in the same place. It appears to me that it is either a scuff or maybe a series of small dents in a straight line along the outside of the rod bearing journal. To me it looks more like something caused by a clamp or a mount of some sort that they may have used to hold the crank during manufacturing or during painting, etc. But... it is very small and it could possibly be a casting defect that almost got machine out when the turned it down. This is the first problem we have seen with them though but it is also a fairly new item.

There is only 1 company importing these cranks so they are the same exact cranks that everyone else is selling and I have not heard about any problems from them either. I have contacted the supplier and they are going to check out their stock and see what we can figure out.

I'll keep you posted.

Aaron
Parts@HoyeTractor.com
(940)592-0181

 

[Darellk]

In my experiece a scratch across the face of metal will set up a fracture point. If the scratch is very shallow it probably could be polished out, which will remove the point of a fracure occuring. I learned this about forklift forks. If they are dented across the narrow face they will eventually break there. The fix is to take a die grinder and polish the dent out with the length of the fork.

 

[kenmac]

I looked at our cranks last night & they do all have the same marking in the same place. It appears to me that it is either a scuff or maybe a series of small dents in a straight line along the outside of the rod bearing journal. To me it looks more like something caused by a clamp or a mount of some sort that they may have used to hold the crank during manufacturing or during painting, etc. But... it is very small and it could possibly be a casting defect that almost got machine out when the turned it down. This is the first problem we have seen with them though but it is also a fairly new item.

Aaron , I know you are just guessing as to why the scuff or small dents are there ,but I can't understand why someone would clamp or attatch something (that would scuff or mar) part of a machined rod bearing or crank bearing journal Hopefuly you will get an answer & let us know. Thanks

 

[RJYork]

I retrieved the two cranks last night. Here are the photos of the broken crank, which I bought in August. I hope you are able to see the texture of the inside of the break well enough in the photos.

 

[1danny]

I retrieved the two cranks last night. Here are the photos of the broken crank, which I bought in August. I hope you are able to see the texture of the inside of the break well enough in the photos.

That looks like a crankshaft out of a 2 cyl, I thought you said it was a YM2010. There have been some problems with the aftermarket 2cyl crankshafts.

Danny

 

[Jagmandave]

Did it break at the rod or main journal?

 

[Egon]

The break fracture seems very course to me. My thoughts are improper tempering and case hardening???

 

[MJPetersen]

The photos are not very clear--It wouls sure help diagnosis if we had some really clear pics. I do not mean to be critical, but it is hard to see the grain structure of the metal in a blurry photo. Your kitchen and dining room are in focus though.

Mike in Warsaw

 

[RJYork]

Yes, it is a 2 Cylinder YM2210. I mistyped on the original post.
I will see if I can get some clearer pictures tonight.