I have the reproduction version of the shop manual and it has that saying in it.
The oil pressure on my 881 is low like yours, about 12 psi at idle, 30 at pto speed, I'm using Delo 400 15w40.
I'm thinking about dropping the pan and changing oil pumps, I'm pretty sure Ford upgraded the oil pump later on, dads old 850 would make 60 psi cold, run 40 psi hot and 20 psi at idle, oil pump wasn't the original.
My 881 is a 62 model, last year of the 801 series, in 63 they painted them blue and called them 4000
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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