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John Deere Tractors Discussion Forum

420U - Ring Gear Evaluation

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Jreb10

01-07-2007 13:12:04

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I just split my 1957 420U and am looking over the flywheel and ring gear, trying to determine what work needs to be done. I'm a novice at this, with no experience with tractors.

How can I evaluate the ring gear teeth? The wear from the starter gear is evident, but the starter never had a problem engaging, and never jammed the way Dubuques sometimes do. Is there a criterion to use on the ring gear teeth, or is it subjective?

I have heard that ring gears may be removed and flipped over to present unworn teeth to the starter. Is this true for a 420? If I do this, do the "fresh" teeth need to be dressed to a new profile to help mesh with the starter teeth?

Thanks for any replies. I want to do the job right and not have to open the tractor up again for a very long time.

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jCarroll

01-07-2007 21:35:59

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Re: 420U - Ring Gear Evaluation in reply to Jreb10, 01-07-2007 13:12:04

The edge of the teeth closer to the starter are beveled to make the starter engage better. Look closely at the teeth all the way around the flywheel. If some of them in a 4"or so strip are noticeably worn, then rotating the gear will bring a "fresh"spot to the starter. If it ain't broke, don't fix it - but you will never have a better chance than right now to do some PREVENTIVE maintenance.

I don't think it's important to rotate it 1/2 a turn. The engine does tend to stop close to one spot, so if you move the gear 8", 10", 12",whatever, you will have a fresh set of teeth for the starter.

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Hayfarmer

01-07-2007 13:33:36

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Re: 420U - Ring Gear Evaluation in reply to Jreb10, 01-07-2007 13:12:04

My JD 430 did sometimes have a problem with starter drive kicking back from ring gear. When I had it apart for something else I removed the ring gear and reinstalled it at about 180 degrees change, not flipped over. Most engines tend to stop at about the same place each time so the ring gear gets worn mostly in one spot. By rotating it on the flywheel you get a new spot to work on. Then again if you aren't having any problems why mess with it?

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