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John Deere Tractors Discussion Forum
:

lubrication of crank/pistons

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bobgrimes

11-08-2019 15:20:46




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Can someone explain to me how the crank and pistons are lubricated in a john deere 620? I have all the tech manuals but can't really find an explanation as to how the oil pump works to supply lube to those parts.




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Mike M

11-09-2019 07:05:00




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 Re: lubrication of crank/pistons in reply to bobgrimes, 11-08-2019 15:20:46  
Are you having a lack of oil to the main bearings issue ? Several guys here have found the rubber packing between the main bearing housing and the main case to seal the oil passage swelled and shutting off the oil flow.



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MSD

11-08-2019 16:52:46




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 Re: lubrication of crank/pistons in reply to bobgrimes, 11-08-2019 15:20:46  
Oil pump sends oil to the filter canister where it is sent to the right and left main bearings. There is a hole drilled in the crank that leads from the main to the rod journals. Each side supplies oil to that rod side. Not sure about the 620 but some rods are drilled so that oil makes it's way to the wrist pin bushing to lube it. The piston just gets splashed with whatever oil there is flying around in the crankcase.

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cole in mo.

11-08-2019 16:48:27




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 Re: lubrication of crank/pistons in reply to bobgrimes, 11-08-2019 15:20:46  
The oil pump supply's oil to each main bearing, the mains then send oil to the rods, oil splashing around from the spinning crank oils the piston skirts and bore.



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