lubrication of crank/pistons

bobgrimes · Nov 8, 2019

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.

cole in mo. · Nov 8, 2019

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.

MSD · Nov 8, 2019

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.

Mike M · Nov 9, 2019

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.

lubrication of crank/pistons

bobgrimes

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cole in mo.

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MSD

Well-known Member

Mike M

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