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John Deere Tractors Discussion Forum
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1950 JD A oil pressure too high

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ironhoarder

05-15-2006 08:04:16




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Hi-
I have a 1950 JD A that I bought from a neighbor. It runs fine, but the oil pressure guage is pegged when it is running. I figure I should do something about it. Here is some info:

* I get some oil leaks at both ends of the line to the oil pressure guage, even though I have tightened both

* The oil pump had been out- the piece where the filter screws onto had snapped off, so that part was replaced and the pump was re-installed

* If I take off the plug infront of the belt pulley, I can see the large hex slotted screw which is apparently the oil pressure adjustment. This is not very well lined up with the access hole (it is low, so you can only get to about 1/2 of the adjuster bolt)...makes me wonder if the oil pump was assembled wrong, a gasket omitted, etc.

* How likely is it that the oil pressure guage is just wrong? It appears to be the original (white letters on black face)

* I don't know what direction lowers the oil pressure- I assume counterclockwise would lower it, but I don't know. When my neighbor replaced the broken part, he kept track of the setting of ths screw, but perhaps he got it wrong.

None of my books discuss this, so I'm coming to the experts for help!

Thanks
LK

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Mike M

05-15-2006 11:30:47




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 Re: 1950 JD A oil pressure too high in reply to ironhoarder, 05-15-2006 08:04:16  
That unit bolts on top of the oil filter can which may be partially crushed down. This could account for the screw being too low ? Take out the oil filter and look and feel around up in there and try to see if the sides of the can are rippled. They should be smooth except for 1 ridge near the bottom all the way around.



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Glen in TX

05-15-2006 08:17:26




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 Re: 1950 JD A oil pressure too high in reply to ironhoarder, 05-15-2006 08:04:16  
The I&T JD-4 discusses this at about paragraph 120. Get a good oil guage with number readings and see if you have 10-15 psi reading. Adjust the screw where you have that and yes CCW should decrease pressure. If that doesn't work start looking for a plugged filter or obstruction in the oiling system.



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Gary Meador

05-26-2006 19:44:11




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 Re: 1950 JD A oil pressure too high in reply to Glen in TX, 05-15-2006 08:17:26  
When I torn my 60 down a few years ago, after removing the inspection cover (crank) and draining the oil, the screen in the bottom was nearly covered from the bottom of the crankcase with crud, may be why my screw was adjusted to full clockwise position. May be yours also. I did lower the pressure with the screw by turning counter clockwise,and after cleaning things up.
GM



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