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Implement Alley Discussion Forum

NH276 plunger bearings, expert advise needed

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used to be jame

02-12-2006 10:57:27

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Last season, I baled up a stick about 1 1/4 inches in diameter. (small enough and soft enough it should not have caused any damage) When the plunger cut it, the knives hit together breaking both of them. I put in new knives and baled on. This winter I was trying to fine tune the knife adjustment when I noticed a lot of play in the two bearings on the right side of the plunger. These two bearings are somewhat different than normal because the side of the wheel rides the rail to keep the knives from hitting each other. That's why it seems to me there should be NO slop in these two bearings.

I don't want to pull the plunger if these bearings are OK. Can any of you pros tell me how tight these bearings need to be to maintain proper knife clearance? I have adjusted the bearing on the left side of the baler to push the plunger to the right. I had a feeler guage at about .016 between the bearings in question and the rail. (manual says to go .010) I'm just afraid if there is play in these bearings, the next stick I hit will again bring the knives together. The baler should have seen less than 100,000 bales and always stored inside.
Thanks

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Hayman

02-13-2006 20:23:53

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Re: NH276 plunger bearings, expert advise needed in reply to used to be james, 02-12-2006 10:57:27

I'd suggest getting a operator's manual for the baler from NH they're usually cheap. It explains it all quite well in it.

I have 278's and I pull the plungers out after every season at aprox 15,000-20000 bales to check things over and sharpen the knives etc. It only takes about 10 minutes to pull one out. The bearings can go for quite a while but over time the outer surface does wear down. Also the side rail on the left side will wear in the one spot always. You can flip the rail though to get wear on the the other side.

I drill holes in the bearings and pump them full of grease when I have the plungers out. Then seal the hole back over again etc. It helps extend the bearing life some.

Key thing is to keep the knives sharp and the clearance between the knives at the .010 to .030" spec.

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Hayman

02-13-2006 20:17:30

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Re: NH276 plunger bearings, expert advise needed in reply to used to be james, 02-12-2006 10:57:27

I'd suggest getting a operator's manual for the baler from NH they're usually cheap. It explains it all quite well in it.

I drill holes in the bearings and pump them full of grease when I have the plungers out. Then seal the hole back over again etc. It helps extend the bearing life some.

Key thing is to keep the knives sharp and the clearance between the knives at the .010 to .030" spec.

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IaGary

02-12-2006 20:19:17

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Re: NH276 plunger bearings, expert advise needed in reply to used to be james, 02-12-2006 10:57:27

We put those bearings in ours few years back.If there is any play in the bearing it self you better replace.

If the bearing has play it won't last much longer. It will go out when you have 20 acres ready to bale and rain coming.

And when that plunger is out you might as well replace all the bearings.

Just my thoughts

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