I have changed the o ring three time and I cant get it to stop leaking. Two new o rings installed....still leaks.

first you will have to find out where the leak is. a lot of times it can leak where the high and low pressure lines connect to the back of the compressor. the rubber o-rings often fail. replace the o-rings if that is where your leak is. and always grease the o-rings when installing the new ones.

Had problems with these types before also. As the filter ages it warps and thats a problem lol.
You said you cleaned the recesses Im hoping top and bottom and lubricated the recesses IN addition to the o-ring, don't hold back on that lube either. And lastly although it sounds odd, dont over-tighten the nuts, tighten them slightly over hand tight turn the pump on for a bit leaking everywher tighten everywhere, leaking in one spot, tighten only that one spot a little.
Putting on all that lube doesnt do too good when it spits it out from pressure.
Also pics next time, and good luck!

The ring is too keep the pipe from damaging the cylinder.
The o-ring on the pipe is what seals it from leaking.

The piston rings are going bad, or you have a leak some where.

Look for leaks by washing down the unit so you can see where the oil is coming from.
It may only leak when running, so you may have to run it until it warms up and then look for the leak. Most of the time i notice the dipstick tube o-ring is bad at the bottom of the tube. Replace the o-ring to stop that leak.

If its the piston rings, then your motor probably smokes while its running or when you really work the motor such as mowing thick high grass.
You spark plug will be oily and indicate to you that the rings are allowing oil to pass by.
To fix that, you have to freshen up the top end of the motor, with new rings and possibly new piston if the cylinder needs bored.

Check for leaks first, then pull the spark plug and see if its oily.

Hello Wes. Begin by installing a new o ring. Take off the old one and take it to a hardware store to get the correct replacement. Also pick up a little tube of O ring lube.

Gasket is not the problem.
Square shaft that is pressed into the turning gear is not tight and allows leaking through the connection.
Only repair is to replace the assembly with the gear drive, blades, etc. and this will take care of the leak. The "O" ring gasket is fine and holds the liquids. However the leak is around the center of the shaft that goes through the bottom.

Regards,
Gary

Go to the hardware store and get a tube of plumber's grease. Then grease up the gaskets and the rubber ring. Snug everything down and if it leaks snug it down a bit more

well, when you changed the oil filter, did you make sure to clean the surface on the engine side? make sure the last o-ring came off with the filter? Lubricate the new o-ring before installing?