ford 4000 Power Steering

wink4000 · Jun 8, 2017

Hey guys,
I've been working on my power steering for my 1968 Ford 4000, initially had pump with external reservoir which burned out, I just bought a new pump with reservoir on the
pump itself (E6NN3K514EA) from this website. It says it fits a range of tractors with varying PSI settings (link provided), Mine being 850 PSI, was just curious how to set PSI on the
pump, is it easy enough to do on my own? I appreciate all the help!
Link to pump purchase

wink4000 · Jun 8, 2017

Ok, so I've looked around my new pump before installing onto tractor. After removing bolt and pulling off reservoir, as if I was replacing the filter, I noticed a large hollow bolt with a spring inside of it (figure #2) and an allen key at the other end. I assume this is the pressure adjustment... I took the photo and then did an experimental half turn, seems to move spring tighter/looser. I think this is my adjustment, but now I guess I still need to know where the adjustment needs to be (850 PSI) for my rig. I suppose the only way is to install, get hydraulic PSI meter reader thing, screw it into the business end of the pump and then trial and error? It would be nice to not blow my hoses/ram cylinder with a high pressure setting that comes stock...

Sean in PA · Jun 9, 2017

The original Ford supplied pumps of that type had shims behind the spring and you removed the threaded plug completely added or removed shims to change the pressure, and the plug gets screwed back in completely until it is tight.

I would think your new one would be like the original ones, as I don't think that you could rely on the threaded plug maintaining position over time as the relieve valve opens and closes repeatedly thus changing the tension on the spring. I would think that it would tend to try to unscrew itself over time.

The I&T FO-31 aftermarket service manual covers the procedure for changing the shims and gives an approximation of every 0.005" change in shim thickness should change the relief pressure by approximately 35 psi.

Destroked 450 · Jun 9, 2017

I put one of those pumps on my 69 4000 years ago without messing with the pressure settings.
Never blew a line or have any leaks because of the extra 250 psi pressure.
Most hyd lines, cylinders and valves are designed to handle over 2000 psi so the 1100 psi that pump puts out wont cause you any problems.

ford 4000 Power Steering

wink4000

Member

wink4000

Member

Sean in PA

Well-known Member

Destroked 450

Well-known Member

Similar threads