1949 Cub implement mounting question

[ron_b_cub]

I am starting on my first Farmall Cub. The question I have is on the clutch housing the cycle mower bracket was mounted to the lower hole of the aft mounting pad. The lower hole is not threaded and that bracket was mounted with what looks like drill rod that was threaded on both ends and extended clear through the housing with a nut on both sides. Is that normal or should that those holes have been threaded?

Thanks,

Ron

[tmays]

Should be threaded

[Eugene]

I have a set (one on left and one on right side directly across from each other) of non threaded holes in the torque tube on my Cub.

It's been a while, but I think the Mott flail mower used the unthreaded holes as well as a Sweepster I use to own.

Will have to check if the unthreaded holes are in the upper or lower position.

[Glen]

Hi,
All the implement attaching holes were originally threaded, that I have ever seen. They are 5/8 inch coarse threads. I have seen where people left the bolts loose, and the vibration of the mower wore out the threads. Especially on a Cub 22 mower check the mounting bolts often during use, re-tighten them if needed. If your threads are gone, you will probably need to use the rod it has.
They used bolts like in the pics below, which are from TM Tractor, with tapered heads that fit the taper in the mounting brackets. It would be good to make nuts that are the size of the bolt heads, and cut a taper on them, so it fits good, but I don't know if you have a lathe, or can find the right size material to make them.
I am in Wa. too.

http://www.tmtractor.com/tm-tractor/gim/drbolt_001.htm

[tmays]

Interesting...that's two cubs with non threaded holes. Like Glen, I've never seen a non threaded implement hole. Raises the question as to whether they were worn away completely(hard to imagine that), or whether Farmall did indeed send some out unthreaded(intentionally or not)

[staninlowerAL]

It would be good to make nuts that are the size of the bolt heads, and cut a taper on them, so it fits good, but I don't know if you have a lathe, or can find the right size material to make them.

You might check the parts stores for taperd lug nuts of the right size and type threads. I found some once that worked OK, but I'll have to check the source. Stan

[Scrivet]

Interesting...that's two cubs with non threaded holes. Like Glen, I've never seen a non threaded implement hole. Raises the question as to whether they were worn away completely(hard to imagine that), or whether Farmall did indeed send some out unthreaded(intentionally or not)

Before we get into some conspiracy theory about IH shipping Cubs with unthreaded holes, how about someone actually measuring the "unthreaded" holes? Smaller than 5/8 then it came that away. larger than 5/8 and it was stripped out or drilled out. I think you'll find the holes were stripped out as Glen mentioned. It's not uncommon for someone to rethread them to 3/4". Think about all the final drive holes stripped out and how some of those are resized to 3/4". Those can strip out as well, if they didn't keep the 5/8 tight probably won't the 3/4 either.

[tmays]

Agree, Scrivet. Seems more plausible that threads became worn and PO drilled the holes out and in lieu of rethreading, used the through rod

[Eugene]

I like the conspiracy theory. Or it was late in the shift on Friday.

My no thread holes are also the lower set.

Measured the holes. Larger than 5/8" but not quite 3/4", closer to 11/16" diameter. 5/8" diameter threaded rod is mounted in the holes.

[Glen]

Hi,
In the IH manual for the Cub 22 mower, all it says is use the bolts to attach the mower to the clutch housing. It's written like they had threads there.

[ron_b_cub]

Thanks to all that replied. The holes in mine measure the same as Eugene pointed out, they are between 5/8 and 11/16" ( actually measured .648). Would lead you to believe they were stripped then drilled but if they were, who ever did it is a much better machinist then me because they are very smooth machined looking holes.

Thanks again to all.

Ron

[Jim Becker]

A piece of drill rod rattling around in that hole would smooth it up quite nicely.