Posted by Tim S on June 10, 2013 at 03:59:19 from (75.49.6.213):
In Reply to: Re: 8630 JD posted by tanman_2006 on June 09, 2013 at 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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