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Implement Alley Discussion Forum

Shearing bolts 276 NH baler..more questions

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Edd in Kentucky

06-24-2006 16:26:04

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This is a follow up on my 6-20-06 question. Thanks for the previous info. We did replace the main brass bushing in the flywheel hub about 2 years ago so I hope it is still good.How do I check it?
However, the little bushing in the flywheel that the shear bolt goes through wears a ring around the edge of the new shear bolt in no time. Then the bolts break for no apparent reason. Just seems like they suddenly decide that their time is up.

I've tried driving the little bushing out, but I can't get straight at it because of the big PTO slip clutch in the way. Putting the new bushing in the freezer before driving it in sounds like a good idea....but how do you suggest I get the old one out? How hard can I pound on it to get it out?

Does the slip clutch come off with just 3 bolts?

Thanks Edd

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Chick

07-08-2006 22:20:20

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Re: Shearing bolts 276 NH baler..more questions in reply to Edd in Kentucky, 06-24-2006 16:26:04

I have been useing the standard Grade 5 bolts with nut and lockwasher for years, with no problems. I don't understand why yall are having trouble with them.

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Edd in Kentucky

06-26-2006 19:19:10

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Re: Shearing bolts 276 NH baler..more questions in reply to Edd in Kentucky, 06-24-2006 16:26:04

Thanks again. Yes I am using factory shear pins with the enclosed locking nut. Think I'll try to take the slip clutch off...3 bolts and change that little bushing. If that doesn't do it...I'll be back.

Edd

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Garry_TX

06-25-2006 19:44:32

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Re: Shearing bolts 276 NH baler..more questions in reply to Edd in Kentucky, 06-24-2006 16:26:04

Agree with all..... ....&/or the combinations of...

I have a 273, that has been a super good baler for me..... but, can count on..(generally just about the time it happens, & my "mind" engages!!).....chasing those short small pieces of windrow laying that didn"t find their way into the baler the first go round, low rpms, going from nill/none grass feeding to even a small dab of grass being picked up,.....time for another shear bolt... & this is with all the bushings good & the shear bolt tight, & not even close to the tying cycle..... ..just the personality of the baler..... .she likes to be at the correct speed if anything is being fed in, & then, very seldom have any shear bolt trouble.....

glc

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Garry_TX

06-25-2006 19:52:12

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ps in reply to Garry_TX, 06-25-2006 19:44:32

Am assuming you are using the shear bolts with a self-lock/crimped nut? lock washer & plain nut won't stay tight on my 273..... ..

glc

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Hayfarmer

06-25-2006 08:07:57

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Re: Shearing bolts 276 NH baler..more questions in reply to Edd in Kentucky, 06-24-2006 16:26:04

When I have replaced that bushing I take the slip clutch off. The bushings I have changed do not come out all that hard when you can get a clear swing at them. I have only done it on larger balers. I have a similar problem, I have changed the flywheel shear pin bushing but the one in the hub is not a bushing. I have a 282 and I don't think the hub is available anymore. Anyway it "wears out" If the nut loostens up it will accentuate that. On mine I don't think there is enough room for an extra locking nut on the shear bolt. The flywheel center bushing can make a difference also.

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Edd in Kentucky

06-25-2006 07:05:49

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Re: Shearing bolts 276 NH baler..more questions in reply to Edd in Kentucky, 06-24-2006 16:26:04

Thanks guys for the input. I think, at least I hope, I have done all the things you have suggested. It is not the plunger safety stop, and although the knives are medium sharp, it sometimes breaks shear bolts even when the chamber is empty, the PTO slip clutch works especially on turns. And I am only running at 1500 RPM. This thing will bale 200 bales without breaking a bolt, then break 3 in the next 50 bales? So....I figure why not change this little $2 bushing...since I've already bought it. But (I feel stupid here) how do I get the old one out of the flywheel without breaking something.

Thanks again, Edd

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RickB

06-25-2006 12:01:30

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Re: Shearing bolts 276 NH baler..more questions in reply to Edd in Kentucky, 06-25-2006 07:05:49

You still haven't said whether you are using the proper shearbolts. Additionally, underspeeding the baler will multiply shearbolt problems due to the higher torque loads present at low speeds vs higher speeds given the same load. If you are shearing bolts without feeding hay into the machine, there is another problem yet to be found.

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Hayman

06-25-2006 01:26:52

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Re: Shearing bolts 276 NH baler..more questions in reply to Edd in Kentucky, 06-24-2006 16:26:04

""This is a follow up on my 6-20-06 question. Thanks for the previous info. We did replace the main brass bushing in the flywheel hub about 2 years ago so I hope it is still good.How do I check it?
However, the little bushing in the flywheel that the shear bolt goes through wears a ring around the edge of the new shear bolt in no time. Then the bolts break for no apparent reason. Just seems like they suddenly decide that their time is up.""
----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----

I have replaced the brass bushing in the flywheel on our one 278 along with the other one located in the slip clutch hub. I have not replaced the one that the shear bolt goes through so far and this baler is closing in on 750,000 bales.

As others mentioned I would check to make sure the slip clutch "slips" still. There is a spec and procedure in the owners manual on it. Also look at the plunger stop under the baler. It has a spec in the book you have to set it to also. I had the one baler's go out of adjustment one time and it went from hardly ever breaking a shear pin to breaking them often out of the blue for no reason under light load.

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Kelly C

06-24-2006 20:42:49

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Re: Shearing bolts 276 NH baler..more questions in reply to Edd in Kentucky, 06-24-2006 16:26:04

Check the plunger safety catch. it might be just out of time enough to cause this problem.
I found out after chasing broken shear bolts for 2 years on my NH68 that the knotter drive chain had just enough wear to cause it to be out of time even though it apeared to be right. I advanced the timing on link. problem went away.

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BobMo

06-24-2006 20:09:30

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Re: Shearing bolts 276 NH baler..more questions in reply to Edd in Kentucky, 06-24-2006 16:26:04

Just like jossette says you need to step back and take another look at the problem. Its not that little bushing thats doing a job on you its something else. I don't know what size tractor your using but sometimes to much torque can give you problems however, its more likely dull or bad adjustment on the baler knives. I doubt that its a timing problem..... ....

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jossette

06-24-2006 19:52:25

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Re: Shearing bolts 276 NH baler..more questions in reply to Edd in Kentucky, 06-24-2006 16:26:04

If the pins are breaking that fast, you're going to fast, the plunger knives need sharpening or it is out of time.

.02 worth

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paul

06-24-2006 21:41:27

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Re: Shearing bolts 276 NH baler..more questions in reply to jossette, 06-24-2006 19:52:25

A worn shear pin hole combined with an little slop somewhere in the pto driveline/flywheel can lead to the shear bolt nuts wanting to turn loose. And then the shear pin breaks quickly.

Is he using the proper shear pins with locking bolts - or double-nutted so they can't turn loose? No locknuts!

--->Paul

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paul

06-25-2006 21:10:57

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Re: Shearing bolts 276 NH baler..more questions in reply to paul, 06-24-2006 21:41:27

>Is he using the proper shear pins with locking bolts - or double-nutted so they can't turn loose? No locknuts!

Shgeez, how much sleep was I missing last nite????

Is he using lock nuts on the shearbolts? No locking washers allowed, & regular nuts will wiggle loose.

Is what I ment to say.

--->Paul

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