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JD 420

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Travis Sullivan

07-09-2003 09:49:21

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Need info on rebuilding the steering gear box and where I can buy the parts, new or used. The steering shaft coupler is worn also, any ideas?

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Henry J

07-09-2003 19:22:40

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Re: JD 420 in reply to Travis Sullivan, 07-09-2003 09:49:21

Travis

Forgot something. When you put it all back together again, Fill it with JD corn head grease instead of the prescribed gear oil. No more leaks down the ole worn vertical shaft. A tried and true remedy for gear boxes with vertical shafts runing through them.

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07-09-2003 17:26:11

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Re: JD 420 in reply to Travis Sullivan, 07-09-2003 09:49:21

Travis,you can get the seals from Deere for $7.05 and $7.85. Probably should look for a shaft at a salvage yard. Just rebuilt the one on my 420W, someone had welded the shaft to the worm which cooked the seal and in turn plugged 2/3 of the radiator with oil and dirt. I spent days soaking and cleaning the radiator, hours with a small file removing the weld. Took worm to a machine shop to be built up a bit, (end where shaft attaches was worn a few thousands) then it was turned and slotted. Think it was $42.50 in shop charges, and $1.25 for a new allen screw at NAPA. Don't know exactly what is wrong with your shaft, but could probably be fixed by a good shop. Hope things work out for you.

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Henry J

07-09-2003 17:12:08

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Re: JD 420 in reply to Travis Sullivan, 07-09-2003 09:49:21

Travis

I got the seals and a bearing from JD. All the parts don't necessarily wear out at the same time. My worm was still good. JD even made the two pawls/studs that fit in the worm - they were replaceable. When you break it down, you can email me and I have a good reference for used parts.

I did a no buck fix on the coupler (you didnt say what kind you had but i had the short shaft with pins in each end that fit in slots. The pins are available from JD, knock out the old and knock in the new. Instead of looking at the $95 coupler that the pins fit into, consider cutting two new llots for the new pins to sit in 90 degrees from the worn out slots. Walla, like new.

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Dan

07-09-2003 12:57:11

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Re: JD 420 in reply to Travis Sullivan, 07-09-2003 09:49:21

some years back, probably more than it seems even, I rebuilt the steering on my Uncle's 430, I have the tractor now. Any way at the time I think you had to get the whole steering box, believe the worm and other gear had to be changed together. I don't remember how much that was but imagine expensive. Got it from JD but you have to get the right one for the model, S, U etc as some have tie rods in front of axle and some behind, boxes turn opposite direction. What trouble are you having? You can tighten down on the bolt on top of the housing.

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