620 oil pressure?

tomstractorsandtoys

Well-known Member
I just bought a 620 that has not been run in two years. It was sold at an auction because the family was not interested in messing with it. The points were shot and plugs nothing great and fuel system was dry. We put new plugs and points and ran a hose to the carb from a small portable tank we use. Tractor turned over twice and was running but the oil pressure gauge does not move. I went to town and got a hose and gauge and screwed it in where the oil line comes out of the block behind the distributer. With the new gauge we only get about 12-15 lbs of pressure. Tractor runs great and does not appear to have any blowby. We also put in new 15w40 oil. Is there an oil pressure adjustment? Where should I start checking for the loss of oil pressure? Is there a better place to put a gauge? It is a nice strait tractor and I do not want to part it out but I will if the oil pressure problem can not be found as I do not want to sell something that is not right. Give me some ideas where to start. Thanks Tom
 
12-15lbs. is normal for a 2-cylinder John Deere. Get a new gauge from Jerry Trcka at Evergreen Restoration. You should be good then.
 
"Is there an oil pressure adjustment?"

Yes - there is a pipe plug on the right side of the block, right above the serial number tag. Behind that pipe plug, there is an adjusting screw. Like the others said, around 15 psi is good.
 
The oil pressure gauge on those is last in series after the fuel shut off. I'm guessing you have something stuck in the line or fitting involving the shut off. It was common for those to accumulate moisture over the years, and then show no pressure in freezing weather.

I'd suggest you not part it out because of "oil pressure"- 12-15 lb is about right.
 
Thanks for the replies. I found my 60 service manual and was surprised to find that my oil pressure is ok. I just expected it to be more than that and was sure something was wrong. Next job is to clean the gas tank and rebuild the sediment bowl assembly. I will clean the lines good before I replace the guage. I might keep this one around to rake some hay and other jobs this summer. Tom
 
The thing to remember this is a low RPM engine, you usually only need about 10-15 PSI per thousand RPM
 

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