Low oil pressure - Super A

Worked the tractor today doing some work around the farm. The oil pressure has been perfect dead center in the middle of the gauge, but I noticed today the pressure gauge to drop to 1/4 towards the end of the day. Any ideas on what would be causing it?
 
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This is where the gauge normally is on a "normal day"
 
Is it a rare occasion for you to run tractor for a lengthy period of time? And maybe just operate it on short
little sessions? It's normal for an engine with some wear to lose oil pressure once engine, coolant, and oil all
gets hot. The hotter the oil gets the thinner it gets. Thus loseing oil pressure because of it's changed vescosity
due to temperature change. Guessing this is your problem. You just don't normally run tractor long enough at one
time for this to happen.

Let tractor cool completely off, restart, and see if oil pressure goes back up to where it was before. If so, the
problem is probly what I mentioned. If pressure don't come back when cooled, then something happened.

I have an H that only registers about a quarter of a gauge when cold. When hot, oil pressure nearly drops to
nothing. It's because of alot of engine wear. Oil pressure goes back to where it was when engine is cooled back
off.
 
There is a common issue with the oil pump cover being warped and causing the gasket to blow out on these engines, which results in low oil pressure. It's an easy thing to check and fix. Pull the oil pan and carefuly inspect the seam where the cover meets the body of the oil pump. You may be able to see the problem without taking the pump out of the engine. If this is the problem you can carefully lap the cover on a flat surface with a fine sheet of sand paper. Replace the gasket with one of original thickness and put it all back together.
Otherwise I agree with redforlife, that's its an engine wear issue.
 
I have run my SA on the "L" for many hours mowing. Its well worn and is headed for a winter in the shop for rebuild & repair session. But it has run at that level of oil pressure for a long time.
 
That's exactly what was wrong with my Super C...Very easy fix.I used 400 grit sandpaper,it took about an hour to get the cover flat. Now the oil pressure gauge pegs out with straight 30W !!
 
(quoted from post at 08:35:55 05/20/19) That's exactly what was wrong with my Super C...Very easy fix.I used 400 grit sandpaper,it took about an hour to get the cover flat. Now the oil pressure gauge pegs out with straight 30W !!

My 1945 A that my great grandfather bought new had low oil pressure as far back as anyone remembered. My grandfather gave me the tractor when I was 15 to restore and I was concerned with the gauge barely reading out of the red. He assured me that it was fine, stating that the IH mechanic told them it was normal after they couldn't figure it out back in the 50's. They had used the tractor like this for half a century with no problems, he said.
Severl years later when I had the oil pan off to check everything I saw the blown out gasket on the oil pump. I was just going to replace the gasket until I noticed the cover wasn't flat. I spent about an hour flattening the cover with a sheet of sand paper on a flat surface, and when I put it back together it was pegging the oil pressure gauge even at an idle.
 

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