Turning up a JD 5020 fuel pump

gqjoe

Member
Hello everyone
I was just wondering how to turn up the fuel pump on my 1967 5020.
I don't want to do anything crazy to harm the engine right out of the blocks but if someone could give me some information on how to do it or where I could get step by step instructions I'd appreciate it very much!
 
As I recall that engine isn't turbocharged, at least as it left the factory, so unless you're operating at high altitude, about all you'll probably get from turning the fuel up is black smoke. I suppose you could add a turbo and then turn up the fuel, but keep in mind, that old engine isn't all that robust. A turbocharged and intercooled engine from a 6030 might go in there without a lot of trouble, but I've for sure never actually made that transplant.
 
If the pump still has the leaf spring shimms you will not be able to turn it up. If it has been repaired there is a chance the shimms were removed, but there are four different leaf springs that limit plunger travel too. Best to set the hydraulic head on the centrality gauge with the pump apart.
 

The 531 does not have cross flow heads like the Dubuque engines so breathing is restricted. 1/4 HP per cubic inch at 1800rpm is a stretch and into making smoke at 132gross flywheel HP.
The late 619 TI engine with the timing gear oil pump drive is a goody and will make 250HP all day without straining.
 
What does a crossflow head and Dubuque engines have to do with a Waterloo built 531?
6030 and 7520's had 531's and they put out well over their rating of 175.
619 has the same head design as the 531's.
Turbo and a little more fuel is all a 5020 needs to wake them up.
 

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