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Combines & Harvesters Discussion Forum

JD 4420 - feederhouse upper variable speed pulley

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andy r

10-02-2012 21:44:43

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I had a bearing go out inside the feederhouse upper variable speed pulley. This pulley would be at the "hinge" point of the feederhouse and combine. Inside of the pulley is the sealed ball bearing, a needle bearing, and another sealed ball bearing. The inside ball bearing went out. Occurred two years ago also. Most all of the 4400's, 4420's, 6600's have had this done. You can see where the pulley moves inward and rubs on the combine frame. First time the bearing went out it wore through the shield that covers the brake lines/wiring/etc. I think the shaft that comes outward from the combine is worn some where the needle bearing rides. This allows the big pulley to not always be square and puts additional force on the inward ball bearing. When you look at a parts diagram it looks as if the shaft is a stub shaft. Anyone ever replaced this shaft that the big pulleys ride on??? Thank you. Andy

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semper fi guy II

10-05-2012 04:17:41

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 Re: JD 4420 - feederhouse upper variable speed pulley in reply to andy r, 10-02-2012 21:44:43  
I was thinking that we had to remove the feeder house to do this repair? We put the corn head on as it acts as a jack stand as opposed to the grain table which likes to waddle around while re-uniting the feeder house with the combine once the job is done on the bearings. Our cast iron blocks wore through and they were replaced (4400).

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10-04-2012 17:51:17

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 Re: JD 4420 - feederhouse upper variable speed pulley in reply to andy r, 10-02-2012 21:44:43  
Hey Andy,

Since no one else has answered, I'm going to take a stab at it from my experience with a 4400.

Been over 20 yrs since i was in there. Yes, it is a stub shaft that fits in a cast iron (I think) hub and is retained by a heavy press fit and (I think) a roll pin. Took some serious heating on the hub to get the shaft to slide in loose enough to put in the roll pin.

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