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NH 474 haybine problem


 
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backwoodsfarm
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PostPosted: Wed Aug 01, 2007 5:40 pm    Post subject: NH 474 haybine problem Reply to specific post Reply with quote

So I was finishing up a field the other day, looked behind me and the reel was not turning. I shut it down, checked the reel drive chain and it was loose. I tightened it up, started the machine and still nothing. After some in depth checking, I found that the sprocket connected to the shaft that goes through the wobble box and runs the reel was stripped. An even bigger problem is that the notch built into the end of the wobble shaft is also stripped. So I guess my question is there any possiblility of fixing this without replacing the very pricey wobble box? According to NH, the wobble box on this machine cannot be rebuilt. Would it be possible to weld the sprocket directly to the shaft? Has anyone ever had this problem? Thanks in advance for any help.
 
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BCnT
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PostPosted: Wed Aug 01, 2007 6:41 pm    Post subject: Re: NH 474 haybine problem Reply to specific post Reply with quote

either weld it or drill for a thru bolt...with both pieces stripped you got nothing to lose tryin it.
good luck
 
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kyhayman
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PostPosted: Wed Aug 01, 2007 7:19 pm    Post subject: Re: NH 474 haybine problem Reply to specific post Reply with quote

I had the same thing happen on a 474. While on the one hand the wobble box cant be rebuilt, I did get a new shaft from CNH and was able to replace it. Not to scarey a job, just that box is one heavy beast to take off and on. I had to put a lot of heat on the driven arm so I replaced the bearings while in there too. Not sure what else one would do to rebuild one, new bearings, seals, and shaft. All CNH stuff.
 
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Don-Wi
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PostPosted: Wed Aug 01, 2007 10:55 pm    Post subject: Re: NH 474 haybine problem Reply to specific post Reply with quote

I'm not completely following what got stripped on the sprocket- the teeth or the key? same thing on the shaft- is it supposed to be a key in it or a notch for a bolt to go through the sprockets and over the notch?

I's get a new sprocket either way, that one's a relatively cheap fix. Should be any way.

For the shaft, depending on how much NH wants for it, you may be better off taking it apart and having it fixed by a machine shop. (build it up w/ weld and turn it back down, then mill a new key or notch)

I've got a pair of sprockets that came loose on a cross-shaft on our Hesston haybine, wore down the shaft and the bore in the sprockets so I'm getting new sprockets made by a machine shop I used to work at, and I'm fixing the shaft myself at the shop I work at now. I built it up today with weld, and tomorrow a co-worker will spin it on the lathe when he gets a chance both ends, about 5" of weld)

If I had it done at the shop I used to work at, it'd probably cost about $100 for the labor involved, but it'd be much more from AGCO because it also has some splines on one end($$$$)

The sprockets will probably run me about $50 or so, maybe a little more. 1 is a #60 w/ 21 teeth, the other is a #50 w/ 15 teeth, both hardened w/ a 1 1/4" bore and 1/4" key, 2 set screws.

Donovan from Wisconsin
 
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backwoodsfarm
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PostPosted: Thu Aug 02, 2007 11:10 am    Post subject: Re: NH 474 haybine problem Reply to specific post Reply with quote

The shaft is round, approx. 1" in diameter and has a rectangular notch that is machined into the end of it. The sprocket also has the same size notch in it. It fits over the shaft and is bolted on with a special washer, lock washer and a 3/8"x 1" grade 5 bolt. Both the sprocket and the notch machined onto the shaft are stripped. I"m curious, if NH says the wobble box cannot be rebuilt, how is it possible to change the shaft? Do you have to take the box apart and keep everything exactly the same after installing the new shaft? I"ve heard that if you even install a shim incorrectly you will trash the whole wobble box.
 
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