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John Deere Tractors Discussion Forum
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Re: 8630 JD

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Author  [Modern View]

06-09-2013 18:34:41

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I figured under 10K hrs and only one overhaul might mean the block should be in good shape. I was figuring something was wrong with the rebuild, improperly torqued heads or maybe a improperly installed liner. I didnt figure the block would be bad yet, that would be a good chunk of iron to haul to the shop.
This is the kind of preader I am thinking of getting.

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Tim S

06-09-2013 18:56:14

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 Re: 8630 JD in reply to tanman_2006, 06-09-2013 18:34:41  
My Brother and I bought an 8630 brand new in 1979, it was setting there as the 8640"s came out, we rolled the tach on it twice,,worked the snot out of it, and yes we did plenty of work on it too...

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06-09-2013 19:32:24

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 Re: 8630 JD in reply to Tim S, 06-09-2013 18:56:14  

Tim S said: (quoted from post at 20:56:14 06/09/13) My Brother and I bought an 8630 brand new in 1979, it was setting there as the 8640"s came out, we rolled the tach on it twice,,worked the snot out of it, and yes we did plenty of work on it too...

What are some of the main fail points? I dont plan on working the snot out of it but it will be worked steady hopefully. I am primarily no till but I have a few customers that still want their ground worked.
I know things like pins/bushings in the center, U Joints, and other things in that area are subject to wear. Are they prone to faster wear than other models?

The main goal is to have a fert rig to compliment my precision soil sampling and maybe pull a pull type sprayer through pastures. I really like the idea of having a usable tractor after spreading fert and not have a spreader truck with only one use.
This post was edited by tanman_2006 at 19:38:20 06/09/13.

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Tim S

06-10-2013 03:59:19

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 Re: 8630 JD in reply to tanman_2006, 06-09-2013 19:32:24  
I have been "well" versed with 84 & 8630's, One of the engine faults is the cam gear that drives the oil pump can fail at about 9,000 to 12,000 hours, this is why you see a lot of them advertised with a 50 series engine in them,,Deere had a good program back then to replace the complete engine, another weakness was the font end is bolted to the front of the engine block, when the tractor front end oscillates hard against the front stops it can "flex' the block,breaking the crankshaft,I have seen this happen several times on both the 84's and the 86's, the high low planetary has straight cut gearing which set up a vibration that would cause the low clutch to fail, a new complete high/low from a 40 series can be installed to correct this,, these are the main fail points. When Deere went to the 60 series they corrected all of this..

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