John Deere 4020 Gas/Oil Light

Anonymous-0 · Jul 30, 2011

I have a 4020 gas that was overhauled when I bought it. The guy was bush hogging and the oil light came on so he shut it down and sold it to me. We tore it down and the oil pump checked out. We found the crank was .020" under and they had standard bearings. We put in the correct bearings and tractor runs fine. The problem is the oil light comes on especially when ran a while. Any idea what is causing the light to come on and stay on? I was told there is a screw that can be turned in to increase oil pressure. Is that what needs to be done?

Bob · Jul 30, 2011

First off, you need to verify the ACTUAL oil pressure with a known-accurate mechanical gauge.

I don't remember offhand, what the oil pressure range is spec'ed at for a 4020, but it's NOT a real high number. I'm sure someone will fill us in on that!

bill mart · Jul 30, 2011

probably should put a known correct guage on it and see what kind of pressure you are getting both cold and when its warmed up.it will give you someplace to start. Bill

Ron A Anderson · Jul 30, 2011

Its easy to add a mechanical pressure gauge on the right side as you are sitting in it. A couple elbows and short piece of pipes all you need. If you idle way down that oil light will flicker but go back out when you increase the rpms.

5020s rock · Jul 30, 2011

fyi--there is jd board.--take out that sender.
i have 4 4020s, all with mechanical gauges. its
ACTUALLY the pressure you have. i think the normal pressure is 30-35lbs....not a bunch.

BANDITFARMER · Jul 31, 2011

The sending unit for the oil pressure light might be bad. Like others have said you need to put a gauge on it to see what kind of oil pressure (start up cold & warmed up and working) you accualy have on it. This will tell you if the sending unit is bad or not. I wont have a tractor on the place that dosent have gauges on they because usualy when the light comes on its to late damage done. I put a T on the tempature and oil ports and put gauges on the dash so I know whats going on. The lights still work put I feal more secure looking down and seeing the gauges working. Bandit

Kentb of SWMO · Jul 31, 2011

My Father-in-Law had a 1967 Chevy do the same thing. Turn the switch on, oil pressure light on. Start the engine, light goes off. Run the engine about one minute, light back on. The sender switch WAS BAD.

Kent

John Deere 4020 Gas/Oil Light

Anonymous-0

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Bob

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bill mart

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Ron A Anderson

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5020s rock

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BANDITFARMER

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Kentb of SWMO

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