20 Most Recent Craftsman 15 gal Air Compressor 3 hp UMC Horizontal k Oil Free Pump - Page 2 Questions & Answers

If you recently replaced the regulator and you have now air leaking any where if the check valve is free and the regluator is good and it would be leaking if it were defective . Then it would have to be the pistion its a dry pump correct .What dose the tank pressure gauge read you should still be able to regulate between the tank and the output gauge even if the pistion were leaking Try disconnecting the regulator and adapting a peice of pipe then a pressure gauge to that and see what the compressor out put is. And look for air leaks these things are loud and sometimes its hard to notice them so feel all around the mechine when its running because unless you have a massive amount of hours or it it shouldn't be a pistion problem

Since the exact model number manual is not available go to Sears and look at the compressors they have on the floor (or in the catalog). Find one that looks like the one you have and note the model number (these devices haven't changed much over the years). order the manual for the one that matches your machine the best.

Turn on the compressor and look for the air leak. It could be a relief valve or a connecting hose or tube. You must locate the leak then see if it is a part that can be replaced.
Gary

If the tank is full (pressurized): Nothing will happen when the switch is turned on. Bleed some air from the tank to see if the motor turns on when the pressure drops.

If the tank is empty or low on pressure: First check the circuit breaker to the outlet the compressor is plugged into. Next, somewhere on the compressor, usually on the motor, there is a circuit breaker. They are usually a small round white or black button that if tripped will stick out about 1/4 inch or more. Push that back in and check to see if your motor runs. The usual reason for these circuit breakers to pop is because the compressor is being run on an extension cord. Rule of thumb for compressors: run longer air lines, NEVER use extension cords. If it is absolutely necessary to run an extension cord it should be 10-guage and no longer than 25 feet.

Most of these are preset to turn off at 125 or 130. Does it go past 60?

probably a bad pressure switch or the wing nut on the bottom of the tank for draining the tank is open

Make sure to use compressor oil available from your local motor factor. Don't use vehicle engine oil as the detergents in it can damage rubber seals in the compressor.

Check for leaks all over the machine. Possibly the O ring on the drain valve is damaged. If the machine is oil-less, the big rubber O ring on the piston could be worn away.
When the machine is turned off can you hear air leaking from anywhere?

Hi my name is John. Welcome to FixYa. You need at least a 20 amp breaker to operate the compressor. Thanks for choosing FixYa...John

Oil free pumps do tend to blow the piston ring (not too expensive) available at searsparts.com. Remove covers to pump and manually turn crank until piston is at top and look at the condition of the cylinder neer top, If it looks scratched, order cylinder kit with piston ring. If it looks good and shiney, could be the valve plate in the head. There are reed valves that tend to break. Run pump however with covers removed and check with soapy water for air leaks and repair as needed (air leaks under the cover will prevent unit from filling). Good luck

Question edited for clarity. Question moved from Misc to correct category. By 'stride wire', do you mean just short across the switch? Yes you can but really you need to fix the problem. You know these things can blow up and spray shrapnel 30 feet? Google Craftsman (model) parts You may have a short in the motor, in which case, shorting it out won't fix it. https://www.google.com/search?q=Craftsman+Air+Compressor.+I+have+to+press+the+reset+button+on+it

regulator is bad, or tank is not low pressure. you could return it for another one.

capacitor weak --motor drawing to many amps if using extension cord[s] not correct or to far from source and causing to much voltage drop -motor faling--compressor failing

question moved from Television and Video category. It is a well documented issue. https://fix-my-compressor.com/33-gal-craftsman-compressor-keeps-tripping-the-breaker/ Lots more here https://www.google.com/search?q=33+Gallon+Craftsman+compressor+it+runs+for+about+20-30+seconds+and+trips+breaker ..

https://www.searspartsdirect.com/model/2isi08jj41-000247/craftsman-106153781-air-compressor-parts https://aircompressorpartsonline.com/twin-cylinder-tank-type-paint-sprayer-106152781-p-721585.html https://mastertoolrepair.com/portable-singlestage-oilbath-electric-air-compressor-parts-106152581-p-49836.html

That model number only shows in this post. I don't see how a compressor can be 'oil-less', the friction and pressure is enormous! https://www.google.com/search?q=6.5+HP+oil-less+60-GAL+MOTOR+%22K56A28B23%22 ..

is the plunger sticking below the housing . if so push it back in with a screw driver