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Implement Alley Discussion Forum

shear pin problems on nh 290 bailer

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Ryan Mendosa

05-21-2006 19:58:48




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bailer will produce several bails fine( square. about 120 lbs.) then shear a bolt. The windrows are not too big and it does not have very much hay in the intake. I am at a lost for a solution?




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hayray

05-22-2006 17:14:30




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 Re: shear pin problems on nh 290 bailer in reply to Ryan Mendosa, 05-21-2006 19:58:48  
Is this a small chambered baler? - 14 by 18 inch? If so 120 pounds is way too heavy - hard to believe you are really getting a 120 pound bale, that is most likely why you are breaking shear bolts. If not, see if the needle brake is too loose and letting you needle carriage slide forward just a little causing the plunger stop to engage, I have had that happen before.

Ray



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Ryan Mendosa

05-22-2006 11:46:34




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 Re: shear pin problems on nh 290 bailer in reply to Ryan Mendosa, 05-21-2006 19:58:48  
It is an engine driven model. What is the recomended bale weight for this model? I have ordered but not recieved a manual.



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Hurst

05-22-2006 07:58:09




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 Re: shear pin problems on nh 290 bailer in reply to Ryan Mendosa, 05-21-2006 19:58:48  
I would think the 290 would have a plunger stop. Is the thing shearing bolts because the plunger is hitting the stop (guards it from breaking the needles if it gets out of time). Also, is the clutch slipping at all (I am assuming that it is like all other NH balers I have seen and has a slip clutch). Also, is it breaking at the same time in the bale production (ex. right at tying, after tying when forming a new bale, right before it is about to tie, etc)? That can help narrow down the possibilties. Our 311 usually will only break the shear bolts either when it is overloaded or the plunger guard comes out because it has lost time or the adjustment has come out. Good luck

Hurst

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Hayfarmer

05-22-2006 07:34:49




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 Re: shear pin problems on nh 290 bailer in reply to Ryan Mendosa, 05-21-2006 19:58:48  
The 290 is getting to be kinda old but they were/are a work horse. I would try the flywheel bushing as mentioned below. Also make sure the hole in the lever that turns it is not worbled out. Also make sure you have the correct shear bolts. If the flywheel center bushings are worn it will also cause shear pin breakage. I would also check timeing as some wear in other parts can cause things to hang up and so you get shear pin breakage. Also make sure knives are sharp and plunger is set close. 120 pounds is pushing hard even for a 290 but I would suspect the problem is something other than too much hay being picked up.

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Deere Scotty

05-22-2006 00:37:48




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 Re: shear pin problems on nh 290 bailer in reply to Ryan Mendosa, 05-21-2006 19:58:48  
Can You be more specific? Is it PTO, or engine driven, & where is the shear bolt located? Scotty



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Jimmy King

05-22-2006 01:47:20




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 Re: shear pin problems on nh 290 bailer in reply to Deere Scotty, 05-22-2006 00:37:48  
Try putting a new bushing in the fly wheel where the shrear pin goes, we had a problem like that once with a N H baler and that was the problem. It was wore enought to let it give then would shear for no reason.



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