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John Deere 630 camshaft gear


 
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JD 630
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PostPosted: Wed Feb 14, 2018 5:07 pm    Post subject: John Deere 630 camshaft gear Reply to specific post Reply with quote

I have all the teeth stripped off the camshaft gear and am unable to see any cause. Everything turns free and nothing binding. Most of them came off at idle. Has anyone seen this before? I would appreciate any help, I Don't want to replace it and have it happen again.

Thanks
 
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buickanddeere
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PostPosted: Wed Feb 14, 2018 6:37 pm    Post subject: Re: John Deere 630 camshaft gear Reply to specific post Reply with quote


The gear on the cam? It drives the distributer and the oil pump . Is the oil pump jammed mechanically or it's discharge blocked and building high pressure ?
 
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Steve@Advance
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PostPosted: Thu Feb 15, 2018 8:04 am    Post subject: Re: John Deere 630 camshaft gear Reply to specific post Reply with quote

It was probably a progressive loss, each tooth chipping away a little at a time until they all gave up.

If it were binding enough to damage the gear something should be obviously wrong or worn.

Had it locked up, it would have only taken a few teeth out or broke the cam.

Just look everything over, be a good idea to replace the crank gear too. Check end play, gear clearance, and runout while assembling it.

Where did all broken teeth go?
 
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JD 630
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PostPosted: Thu Feb 15, 2018 10:52 am    Post subject: Re: John Deere 630 camshaft gear Reply to specific post Reply with quote

I have tried to check everything that is driven by the camshaft gear, everything turns free. I
haven't taken the powertrol pump apart but turns free.The teeth were all in the bottom of the
crankcase. the teeth came of 1 or couple at a time while ideling and made a loud pinging
sound. When I get back to the tractor I will take the powertrol pump apart. thanks for the
replies.
 
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buickanddeere
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PostPosted: Thu Feb 15, 2018 3:47 pm    Post subject: Re: John Deere 630 camshaft gear Reply to specific post Reply with quote

So it was the cam gear out there behind the flywheel, not the gear on the cam that drives the distributer ?
 
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ndbjda
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PostPosted: Thu Feb 15, 2018 6:12 pm    Post subject: Re: John Deere 630 camshaft gear Reply to specific post Reply with quote

You should also check your live hydraulic pump. Make sure the idler gear between the pump drive gear and the cam gear isn't running tight or the bushing is bad.
 
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Naylorbros
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PostPosted: Thu Feb 15, 2018 8:01 pm    Post subject: Re: John Deere 630 camshaft gear Reply to specific post Reply with quote

What is the part number for the idler gear bushing? I do not remember seeing it in the parts book just the gear assembly
 
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PJH
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PostPosted: Thu Feb 15, 2018 8:17 pm    Post subject: Re: John Deere 630 camshaft gear Reply to specific post Reply with quote

The idler gear bushing is not sold separately. It comes installed in a new gear. I don't think that idler gear would take out the cam gear. When the idler gear seizes to the idler gear shaft, it shears off the keeper pin and then the shaft rotates in the governor housing. Any time I have one apart, I install an external oil line for the idler gear/shaft.
 
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buickanddeere
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PostPosted: Fri Feb 16, 2018 6:38 am    Post subject: Re: John Deere 630 camshaft gear Reply to specific post Reply with quote

CVPost-PJH wrote:
(quoted from post at 00:17:23 02/16/1Cool The idler gear bushing is not sold separately. It comes installed in a new gear. I don't think that idler gear would take out the cam gear. When the idler gear seizes to the idler gear shaft, it shears off the keeper pin and then the shaft rotates in the governor housing. Any time I have one apart, I install an external oil line for the idler gear/shaft.


I think you have isolated the problem and have the solution .
 
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fixerupper
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PostPosted: Sat Feb 17, 2018 10:21 am    Post subject: Re: John Deere 630 camshaft gear Reply to specific post Reply with quote

I had a seized idler gear kill the engine at idle before it sheared the pin. I just don't see how a seized idler could take all the gear teeth off but I haven't seen everything either. I suspect something got in the teeth and started a chain reaction.
 
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JD 630
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PostPosted: Sun Apr 15, 2018 2:17 pm    Post subject: Re: John Deere 630 camshaft gear Reply to specific post Reply with quote

I would like to see exactly how you did this, such as where you got the supply and where and how you entered the governor housing. I am convinced that the idler caused it all.
thank you.
 
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buickanddeere
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PostPosted: Mon Apr 16, 2018 3:53 am    Post subject: Re: John Deere 630 camshaft gear Reply to specific post Reply with quote

CVPost-JD 630 wrote:
(quoted from post at 18:17:07 04/15/1Cool I would like to see exactly how you did this, such as where you got the supply and where and how you entered the governor housing. I am convinced that the idler caused it all.
thank you.


Oil pressure gauge sender line to a port drilled and tapped into the idler shaft .
 
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PJH
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PostPosted: Mon Apr 16, 2018 6:00 am    Post subject: Re: John Deere 630 camshaft gear Reply to specific post Reply with quote

Here's a picture of an external oiler that I added to my JD 50. If you have the governor housing off of the tractor, you can drill straight through the idler shaft bore from the left (open) side. There is a convenient dimple in the end of the bore to center your bit. I guess you could do it on the tractor, but the drill cuttings would worry me. The lines are standard brake line from an O'Rielly's store. The fittings are off the shelf from a good hardware store. The whole project probably didn't cost $20.

I've also done this to my 630 - same exact scenario.

 
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JD 630
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PostPosted: Mon Apr 16, 2018 9:15 am    Post subject: Re: John Deere 630 camshaft gear Reply to specific post Reply with quote

Thank you for the fast reply, thought about using oil pressure to gauge line but thought it may affect the pressure to the gauge. I will copy your installation and hope that will cure my problem.[/code]
 
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