Steering Housing Mod

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Sailor
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Steering Housing Mod

Postby Sailor » Tue May 17, 2016 3:09 am

100_0984.JPG

After installing the housing, I noticed that the two bolt holes were different sizes. The one on the left is a 3/4" with course threads. The hole has been bored so that the full surface of the bolt end makes contact with the tool bar. The bolt on the right looks to require a 5/8" bolt with FINE threads. The hole was not bored entirely out, so this bolt will have to have the end tapered to make contact with the tool bar.

Am I correct in assuming that the steering gear housing did not come off the assembly line like this?

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Re: Steering Housing Mod

Postby Shane Nelson » Tue May 17, 2016 5:54 am

I am pretty sure both of our Cubs are 5/8 coarse threads on both holes. I will have to check to be sure.
Last edited by Shane Nelson on Tue May 17, 2016 6:54 am, edited 1 time in total.
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Re: Steering Housing Mod

Postby Stanton » Tue May 17, 2016 6:42 am

Can't remember exact size either, but do know they're the same size on both my Cubs.
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Re: Steering Housing Mod

Postby Barnyard » Tue May 17, 2016 9:05 am

Sailor wrote:Am I correct in assuming that the steering gear housing did not come off the assembly line like this?

I would say you are correct in assuming that. Quite possible somebody stripped the original threads and drilled it the next size up.
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Re: Steering Housing Mod

Postby tst » Tue May 17, 2016 9:37 am

thread size should be 5/8 11, you can heilacoil the holes to the correct size

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Re: Steering Housing Mod

Postby John *.?-!.* cub owner » Tue May 17, 2016 11:05 am

I believe those holes were intended for hardened set screws to hold the implement bars in place. Overtime a standard bolt tends to mushroom on the end and creates a difficulty in being removed. Which is probably the reason the one hole is now larger.
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Re: Steering Housing Mod

Postby Sailor » Tue May 17, 2016 11:59 am

Since I've never attempted a heilacoil procedure, I'll save that job for the next Cub Fest where I'll have some adult supervision. :wink:

John, what do you mean when you say they should be "hardened set screws". Is that something special I need to buy?

Thanks for all your help, Guys.
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Re: Steering Housing Mod

Postby Don McCombs » Tue May 17, 2016 12:12 pm

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Re: Steering Housing Mod

Postby Clownfish » Tue May 17, 2016 1:10 pm

If you have a hole tapped for ¾-10 is it ok to use a 5/8-11 Heli-Coil? If I am reading the charts correctly , the drill size for the Heli-Coil is 21/32(.6562) which means that all of the old ¾” threads would not be drilled out and the tap for the Heli-Coil would be cutting new threads across the old ¾” threads. I recently had this same situation on an implement bolt hole in a final. Since I did not know if the Heli-Coil would hold in this situation I used a solid insert which uses a 49/64”(.7656) drill and removes all of the ¾” threads.

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Re: Steering Housing Mod

Postby Shane Nelson » Tue May 17, 2016 1:17 pm

http://www.mcmaster.com/#90245A038

That one is a 5/8-11 internal thread with 7/8-14 outer thread drill bit size is 53/64 (.828). Helicoils need to be banned in the U.S. is my thoughts on them, lol. I never have liked them and have had great success with threaded inserts.
Last edited by Shane Nelson on Tue May 17, 2016 1:19 pm, edited 1 time in total.
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Re: Steering Housing Mod

Postby John *.?-!.* cub owner » Tue May 17, 2016 1:18 pm

Sailor wrote:Since I've never attempted a heilacoil procedure, I'll save that job for the next Cub Fest where I'll have some adult supervision. :wink:

John, what do you mean when you say they should be "hardened set screws". Is that something special I need to buy?

Thanks for all your help, Guys.

As Don suggested, or get a grade 8 bolt and round the end a little with a grinder. The main thing is to keep the bolt from mush rooming when it is tightened against the tool bar.
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Re: Steering Housing Mod

Postby Jim Becker » Tue May 17, 2016 1:27 pm

Don McCombs wrote:http://www.mcmaster.com/#91418a802/=12g9wtp

or

http://www.mcmaster.com/#92308a811/=12g9xuq

The originals were cup point, like the second option. IH wasn't consistent in use of the setscrews. A lot of the time, they just called for a hex-head capscrew. Some implements had setscrews packed with the hardware.

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Re: Steering Housing Mod

Postby Glen » Tue May 17, 2016 7:52 pm

Hi Larry,

Here are pics of the setscrew I use for my Cub 22 mower, it is for the standard size hole, and has the hollow point. They dig into the square bar, so it holds it in place. It needs a lock nut to tighten against the housing to keep the setscrew from loosening during use.
After mowing for 20 minutes, check it and re-tighten it again, the point works into the bar some and the bar loosens in the square hole. Tighten it enough times that it remains tight. It is not fun if the bar falls out of the square hole during mowing from the setscrew being loose.
If you can find a 3/4 inch setscrew, that would work if you don't want to change the hole in the casting, if the threads in the casting are good. :)
Attachments
set screw.jpg
set screw 2.jpg
set screw 3.jpg

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Sailor
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Re: Steering Housing Mod

Postby Sailor » Fri May 20, 2016 9:02 am

Should I use a lock washer with the lock nut?

Thanks Glen, great information.
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Re: Steering Housing Mod

Postby Trent M » Fri May 20, 2016 9:13 am

Here are the original set screws from my '49, they look just like Glen's. No lock washer and the lock nuts are thinner than a regular nut on mine, but I'm sure that doesn't matter for practical useful purposes.

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