Hi cloudhome,
If I remember right most of that style motor has an adjustable centrifugal capacitor switch.The switch has a closed circuit when the motor is at rest.When the motor starts, current charges the capacitor, starting the motor. At a preset RPM the centrifugal dogs will move out opening the circuit and cutting current to the capacitor. When the motor shut off and slowed down, the dogs would move back in and close the circuit until the motor started again.
The trouble with a lot of the centrifugal switches was over time the contacts would get burnt and pitted and make poor contact thus not allowing a closed circuit to exist. Also most of the centrifugal dog assemblies sit on the output shaft and can be moved forward or backward depending at what RPM you want the circuit to open up at. The adjustment is done with an allen screw that you can loosen and make the adjustment. often over time the screw will loosen allowing the dogs to move on the shaft throwing the switch adjustment off.
Again I'm not quite sure how yours work but as long as you don't see anything broken it can be a matter of cleaning up and resetting the centrifugal switch. Hope that helps you some.Good luck.
Tinker

Hi Curly69,

That sounds like a worn Piston Ring and Cylinder to me. To find the correct parts for your compressor punch the model number into our Parts Finder and then select the correct Type number for your compressor.

I hope this helps!

-UtahAV
-Mark

replace kit ring and sleeve

the check valve is dirty; just clean it

Hi David,

The rings are only available with the piston and cylinder assembly. If the rings have worn you will need to replace the cylinder anyway as it will have also worn. the piston & cylinder kit is part #KK-4835 and is available from http://www.ereplacementparts.com.

I hope this helps with your repair!

-Mark

Hello,

I think the tube you are reffering to is the outlet pipe (part #D20694, item #16 on the parts breakdown). It is attached to the regulator with a compression nut (item #17 part #SSP-7821-1), and a rubber o-ring (item #15, part #SSG-3105) on the parts diagram. I would guess that it is either the o-ring or a crack or split in the outlet pipe itself that is leaking.

I hope this helps with your repair!

-Mark

If the compressor builds pressure normally and shuts off then I would suspect that the regulator may be clogged. Sometimes one of the o-rings will fall apart and clog the passages in the regulator.

If the compressor never builds enough pressure to turn off or if it builds very slowly then it likely has a worn out piston and cylinder. The piston and cylinder are offered as a kit. The kit is part #K-0650 and is available from http://ereplacementparts.com.

I hope this helps with your repair!

-Mark

Hello leejk,

That does sound like a start capacitor problem to me as well. The capacitors will occasionally go bad and leak an oily liquid like you mentioned. The function of the capacitor is to give the motor a momentary jolt of power at start up. If it is not functioning it will create just the situation you described.

The start capacitor is available from ereplacementparts.com.

The Start Capacitor is part #D21216

Let us know how your repair goes!

-UtahAV
-Mark

I have the same problem with a Porter Cable CF2020 but there is are no oil leaks. Anybody have any other ideas? One person said the check valve but I'm not sure how to test it.

I ordered the part and installed it and it runs good as new now. Thanks for the help!

[QUOTE=UtahAV;4805]Hello leejk,

That does sound like a start capacitor problem to me as well. The capacitors will occasionally go bad and leak an oily liquid like you mentioned. The function of the capacitor is to give the motor a momentary jolt of power at start up. If it is not functioning it will create just the situation you described.

The start capacitor is available from ereplacementparts.com.

The Start Capacitor is part #D21216

Let us know how your repair goes!

-UtahAV
-Mark"

Hi leejk,

Great to hear that the problem was solved! thanks for writing back!

-UtahAV
-Mark

Hey Windowman19,
You may have a bad check valve that is letting air back out of the tank into the head causing it to load up..an easy way to check this is to loosen the nut on the check valve after the tank is full or has some pressure in it to see if it leaks.[.it shouldn't leak at all after the air compressor is full and not running..]you may also have a problem with your valve plate assy causing issues, make sure your air filter is clear also..sometimes the bolts on the motor become loose and causes a rotor shift or bind on start up..! as far as the capacitor it usually is ok and if it does fail the air compressor will just hum at not start at all..
hope this has been helpful..
Craig
Geneva Tool Repair

Thanks A bunch, Craig ! I ' ll let you Know How I Do. Richie