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Combines & Harvesters Discussion Forum

JD 4420 Feeder house upper variable speed pulley bearing

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andy r

09-30-2012 19:32:15

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Combine - John Deere 4420. About 300 acres ago I put a new sealed ball bearing inside the upper variable speed pulley. This is the pulley that has the two belts - one driving the lower variable speed pulley and one powering the pulley. The bearing fits into the backside and goes against the combine frame when you push the pulley assembly on the combine.

Shouldn't this bearing last longer?? It is a good size bearing.

Is this a weak spot?

Did I get a bad bearing?

Did I do something wrong when I replaced it in 2010?

You can tell when the bearing goes bad, the pulleys move inward and start rubbing on the combine frame/sides. Not a terriable job to replace it. Thank you. andy

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paul Em

10-01-2012 17:50:49

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 Re: JD 4420 Feeder house upper variable speed pulley bearing in reply to andy r, 09-30-2012 19:32:15  
Might also depend on what country the bearing was made in......

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09-30-2012 21:22:34

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 Re: JD 4420 Feeder house upper variable speed pulley bearing in reply to andy r, 09-30-2012 19:32:15  
Those bearing usually last a long time. Check and see if the hole in the housing is worn letting it have additional side load. I have only replaced one or two of those bearing on all of the combines I have ever worked on. So they are not a big wear out item. You have something causing it to go out.

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andy r

10-01-2012 06:39:26

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 Re: JD 4420 Feeder house upper variable speed pulley bearing in reply to JDseller, 09-30-2012 21:22:34  
The pulley I am talking about that the bearing has went out in is the same one that has the roller bearing inside of it. The roller bearing runs on the shaft coming off of the combine. Roller bearing seems ok. Shaft coming off of the combine which the roller runs on looks ok too - shows a slight amount of wear. I am like you, with the size of the bearing it should last a while.

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