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John Deere Tractors Discussion Forum
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Re: Early '35 John deere A oil pressure

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A GURU

12-13-2013 18:10:16
184.99.196.119



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As Vern said, everything stated so far is good advice. Sounds like it might be mostly the sludge that is the culprit, and with it possibly more neglected things. You might want to pull the crankcase cover and check out all the internals, given what you are finding.
One more thing I would add is that you may have an oil pressure test port just below the "red head" oil stick. Basically "any" oil pressure is "good" oil pressure. 5 PSI and up???
Here is a pic I just took of a late 35 governor for reference. The 1/4" pipe plug is where you can install a gauge, when you retest.

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Vern H

12-14-2013 11:04:29
75.226.59.134



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 Re: Early '35 John deere A oil pressure in reply to A GURU, 12-13-2013 18:10:16  
Hi A Guru,
Thanks for posting the pic. It jogged my memory enough to go look at my old rag of a 35A. When I bought it someone had brazed a nut below the plug, brazed the pop-up rod at the top, drilled through the casting at the nut, and installed a gauge. It was ugly! I cleaned it up back to original. Luckily all the parts were still there. Behind the existing plug is a hole that drains any oil that leaks past the pop-up shoulder/seat back into into the governor housing. There is never any pump pressure to the plug so it isn t a spot for a gauge. When the pop-up comes up I think to myself, good, I have some oil pressure! Please keep up the very informative posts. Happy holidays all. VH

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elkcagg

12-14-2013 06:00:43
32.128.79.130



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 Re: Early '35 John deere A oil pressure in reply to A GURU, 12-13-2013 18:10:16  
I tried putting a gauge on mine here too but it didn't register. I just depend on the red head now.



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A GURU

12-14-2013 11:30:26
184.99.196.119



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 Re: Early '35 John deere A oil pressure in reply to elkcagg, 12-14-2013 06:00:43  
My mistake. I just assumed it would show the pressure. I knew it led to the gov bearing but thought it would still register something. I didn't have an open one to look at. As you said, the pop up is a plenty good enough indicator, if it functions. Practically any oil pressure at all is enough oil pressure.



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Vern H

12-14-2013 14:36:11
75.226.59.134



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 Re: Early '35 John deere A oil pressure in reply to A GURU, 12-14-2013 11:30:26  
A Guru,
An after thought. That plug opening would certainly make a swell spot for a gauge if the pop-up innards were removed, and the top and the relief holes were plugged. I m with you on using the pop-up. I don t think it is as important to know how much pressure you have as just knowing you have some. Best regards, VH



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