D69u water regulator

You can grind part of the head off some 3/8" bolts so that the remaining part hooks in the slots of the retainer ring and the ground surface presses against the body of the regulator when you stand the bolt up straight. That way it will keep the hook from slipping out of the notch at least when it's first breaking the retainer loose. Then put a short spool piece of pipe over the bolts and regulator and a piece of plate on top with two holes drilled in it for the bolts, put nuts on and draw them up to pull the retainer.

Or use a slide hammer puller

The regulators can be disassembled and lubricated I believe. Don't know if I would trust one after it had stuck, but I remember something about servicing them in some CAT literature.

Maybe grind some relief in the retainer?

I believe the new regulators do not use the retainer, but do not know how they fit in the housiing. An aftermarket version I got for a D311 fit on top of the flange inside the gasket space. Perhaps a large o - ring would work as a retainer in your case.

That s/n 9U uses a 6F9467 regulator.
5H0957 is not a correct replacement.

Thanks for the help with the correct part#s. That did the trick.
Any way to convert my oil lines from the oil cooler to the filter base to flex lines( ie: hydraulic )?. Mine were removed some time ago and are too mangled to re use.

Before you get comitted to reconnecting the oil cooler better test it with air. Lots of them are disconnected because they leaked.

I have a new oil cooler already pressure tested and ready to go. For the hose and brass fittings, do you mean to use worm drive hose clamps( radiator hose clamps) and make the hose myself , or go with store made hydro crimped hose and fittings?. I would think the pressure would be low enough to use the worm drives, but I will let those with more experience rule.