JD 4020 injection pump leak

Ray · Apr 10, 2017

I have a 1967 model 4020. I noticed the flat head screw on the front of the pump has started to leak fuel. I guess it's part of the governor.It has the pump seal wire going through it.I tried to tighten it, but it won't move. Is this something I can fix or do I need a pump man?

D- · Apr 10, 2017

Just screw it out and replace the oring.
It's only a plug.

bison · Apr 10, 2017

Yep just a plug with a O ring.but watch when you screw it out, there is a pin right up in that hole that engages the advance piston to the cam ring and it may fall out..The plug hold the pin in place.

fdt860 · Apr 11, 2017

Is thit possible to access the power screw from this plug?

thepumpguysc · Apr 11, 2017

Oring P#> 27610 stanadyne/roosamaster..
Bison, that's a DB style pump not a CB.. see the head locating screw to the left?
The pump is going to be full of fuel so be prepared.. unscrew & install new oring nothings going to fall out.
Lube the oring before installing..

thepumpguysc · Apr 11, 2017

IF your talking about the max fuel screw and I think you are.. NO. its done thru the top.

Ray · Apr 11, 2017

When I took the screw out today there was no 0 ring on it. It must have been like that since it was rebuilt years ago.

JD 4020 injection pump leak

Ray

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D-

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bison

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fdt860

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thepumpguysc

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thepumpguysc

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Ray

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