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Beginner with a question...Breaking pins?

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Dave

03-07-2002 07:13:34




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I got my tractor and bush hog the other day. Its great! except on my bush hog I keep breaking pins on the Bush hog side of the PTO connector...sorry dont know the right term for it yet hehe. I went to town and bought like 8 pins to connect them and i broke all but one yesterday. The pins i bought i dont think were wide enough so they allowed a little play in the connection....could this be why they are breaking? or am i doing something wrong by hitting small trees :)
the guy at the tractor place said if i could run over it i could bush hog it, or something like that. Thanks!

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There is a certain satisfaction is bushoggin...

03-07-2002 19:09:28




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 Re: Beginner with a question...Breaking pins? in reply to Dave, 03-07-2002 07:13:34  
If you can run over it you can mow it, huh? hehe
Been through that myself... a time or two.

2 things

1. perhaps you are mowing too low and too fast...

&

B. Buy a slip clutch and forget all about the shear bolts snapin on ya... thats what we did.


B.T.W.- we mowed over 200 acres this past season using a new 6' bushog on a 1962 David Brown 990 diesel tractor. Both worked to our satisfaction.

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There is a certain satisfaction is bushoggin...

03-07-2002 19:08:58




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 Re: Beginner with a question...Breaking pins? in reply to Dave, 03-07-2002 07:13:34  
If you can run over it you can mow it, huh? hehe
Been through that myself... a time or two.

2 things

1. perhaps you are mowing too low and too fast...

&

B. Buy a slip clutch and forget all about the shear bolts snapin on ya... thats what we did.


B.T.W.- we mowed over 200 acres this past season using a new 6' bushog on a 1962 David Brown 990 diesel tractor. Both worked to our satisfaction.

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Dave THANKS GUYS!

03-07-2002 12:06:50




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 Re: Beginner with a question...Breaking pins? in reply to Dave, 03-07-2002 07:13:34  
Thanks for all the Info. After shearing all those pins i starting being reeeeeal gentle on the last pin lol. I think I sheered about 4 before i decided i shouldnt drop the PTO into full power, now i slowly accelerate it up to speed.

Also i have a mahinda (sp?) e350 with a grizzly bush hog.....combo deal. Its great for my mid size farm.



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XXXXXXX

03-08-2002 10:50:19




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 Re: Re: Beginner with a question...Breaking pins? in reply to Dave THANKS GUYS!, 03-07-2002 12:06:50  
You are a danger to yourself, your family, and everyone else who has the misfortune to be nearby when you are operating any power equipment. Like too many others, you should have stayed in town! If you have so little common sense that you think you start power equipment at full throttle, rather than start at idle and work up to speed, you should not be allowed to own anything as advanced as a lawn mower. I've often been amused by the messages on boards like this, but you are beyond humor. Do you drive a car like this too? Rev the engine and drop it in gear? Think about it- develop some common sense, or go back to town. We're tired of paying for those who cripple. Power equipment is for those with some brains!

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YYYY

03-09-2002 20:35:14




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 Re: Re: Re: Beginner with a question...Breaking pins? in reply to XXXXXXX, 03-08-2002 10:50:19  
Hey XXXXX ,
y'all oughta read this post over'n the Combine board. Makes you wonder how some of these ol' boys can run their farms, 'cause they sure don't show mucha brains or 'sponsibility.



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XXXXXX

03-10-2002 09:54:25




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 Re: Re: Re: Re: Beginner with a question...Breaking pins? in reply to YYYY, 03-09-2002 20:35:14  
Exactly. I noticed the responder wasn't too good at following the line of questioning either. Maybe when some farmers (?) get charged with the child endangerment that they are guilty of, they'll think twice. I doubt it, though. Told me kids if they EVER get out of that cab with the PTO running, they are on pitchforks and scoop shovels until they leave home. We still have all of our body parts in working shape.

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paul

03-07-2002 11:56:50




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 Re: Beginner with a question...Breaking pins? in reply to Dave, 03-07-2002 07:13:34  
Bolt with continue to shear as long as it has play in the holes. You will soon 'oblong' the holes with an undersized bolt & then the right sized bolt will aslo shear, as it too will have play in it.

If your holes already are worn & oblonged, you'll need to replace or weld up & drill out the hole to the right size, and always use the right size & hardness (probably 2) of bolt. Sometimes bolts from the dealer will be better, as they do not have threads cut down as far, and weaken the bolt right where it gets the shear load.

I use the nylock nuts, I don't like a long bolt end spinning around ready to catch grass, the dog, my pants leg - not that a short one is ever 'safe'.

I have also heard that strong 2-cylinders can be very hard on pto driveshafts.

--->Paul

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bbott

03-07-2002 11:46:34




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 Re: Beginner with a question...Breaking pins? in reply to Dave, 03-07-2002 07:13:34  
If you have slop in the shear bolt hole, that could be your problem. Shear bolts are designed to work with proper 'load bearing area' around the pin.

If the hole is worn and allowing the bolt to cock
it will put a 'point load' on the bolt shaft and shear a lot easier than the design called for.

With a loose fit there's also a 'inerta' effect involved. One side of the hole has slowed or stopped and the rest keeps going (for a little while). This puts a tremendous shock impulse on the bolt when it hits. Ping!

(That's the same reason you need to keep your binders tight !)

-- bbott

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DP

03-07-2002 10:28:53




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 Re: Beginner with a question...Breaking pins? in reply to Dave, 03-07-2002 07:13:34  
Dave, you didn't say what tractorr you are running it with. I bought a bushhog a few years back, and run into the same problem using hardened shear bolts. I was just mowing tall grass and would shear a pin about every 15 minutes. After talking to a factory rep. it was determined the problem was what I was running it with. He told me that if I was cutting with a two-cylinder tractor, I would need the slip clutch assembly. I was using the 630 Deere, and not even pulling it. After the slip clutch, I had no more problems. This is going to be of no help if you arn't running a Deere.

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Steven@nd

03-07-2002 09:40:04




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 Re: Beginner with a question...Breaking pins? in reply to Dave, 03-07-2002 07:13:34  
Another possibility is that there is something wrong with the gear box or blades underneath that is causing it to turn hard therefore shearing the bolts. Be sure it turns free by hand before using it.
Steven



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DAVE M

03-07-2002 09:15:36




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 Re: Beginner with a question...Breaking pins? in reply to Dave, 03-07-2002 07:13:34  
YOU ARE SHEARING THE SHEAR BOLT AS THE OTHER GUYS
HAVE SAID. BUT HAVING TO STOP AND PUT IN A SHEAR
BOLT SURE GETS OLD! IF YOU CAN AFFORD IT I WOULD
SUGGEST A NEW PTO SHAFT WITH A SLIP CLUTCH ASS'Y
NO MORE BOLTS TO SHEAR!



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ShepFL

03-07-2002 08:55:58




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 Re: Beginner with a question...Breaking pins? in reply to Dave, 03-07-2002 07:13:34  
I assume you are talking of the pins that lock the PTO shaft to the gear head extension. I personally use Grade 2 bolts of the diameter to fit the hole (1/2" I think). I buy them long enough to stick out ~2-3" on the thread side. I then bend the bolt over with whatever is handy.

More efficient work process to bend and keep mowing vs. stop, bolt, get wrenches, tighten, retighten. Resume mowing. I usually carry 3-4 extra on the rig so I don't have to go back to house.

Used to fasten the bolt with a double nut but vibration always loosened them. Always had to stop and retighten or risk slinging bolt & nuts. I then switched to "Nyloc" nuts which are more expensive and were lost when bolt sheared.

DO NOT USE GRADE 5-8 BOLTS !!! DO NOT USE ANYTHING HARDER THAN GRADE 2!!!!

The shear pin, Grade 2 bolt in my case, is designed to shear. By shearing you prevent major damage to bush hog, bush hog gear box, PTO shaft, PTO components, and possibly you.

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XXXXX

03-08-2002 13:07:46




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 Re: Re: Beginner with a question...Breaking pins? in reply to ShepFL, 03-07-2002 08:55:58  
You buy extra long bolts, and bend them over. Sounds like another guy who should have stayed in town. Use the machine the way it was designed, instead of cobbling it together,before you hurt someone.



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JD790

03-09-2002 14:33:18




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 Re: Re: Re: Beginner with a question...Breaking pins? in reply to XXXXX, 03-08-2002 13:07:46  
Is that you Burr?



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jeff

03-07-2002 07:19:34




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 Re: Beginner with a question...Breaking pins? in reply to Dave, 03-07-2002 07:13:34  
you need to get the correct shear pins from the dealer . jeff



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Halsey Green

03-07-2002 10:17:43




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 Re: Re: Beginner with a question...Breaking pins? in reply to jeff, 03-07-2002 07:19:34  
A question for you, when you start up the bush hog, do you have the tractor engine at PTO speed or is it lower and you bring it up to speed once its started spinning? I had a simular problem, it was the shock load of startup at PTO speed that was partially shearing the pins, then when I hit someting, it finished the job on the pin. Changed my habits and haven't sheared a pin since.



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