Question about Air Tools & Compressors

1 Answer

Craftsman compressor will not come up to pressure

I have a 6hp 30 gallon oiless compressor model 919 165140.The ring broke and scored the cylinder. I replaced the rod,ring, cylinder,and gaskets. Now I can only get 70 psi? It will continue to run but not get over 70 psi?

Posted by on

  • demaio Apr 22, 2009

    I found the middle reed valve was broken. Missing about 1/8", so I will buy the valve plate assembly and go from there. Thanks

  • Anonymous Apr 29, 2009

    i have a craftsman 7hp compressor, my problem is it will build up to 130 and not all the way up to 175... The real problem is that the compressor will not run my tools; the motor runs while running but i have to stop for it to build up pressure and even at that it takes forever to build up... This compressor should run all my air tools but it will not keep up, the pressure just keeps falling... I replaced the pressure regulator, that wasn't it.... If you can please help..


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Air Tools & ... Master
  • 1,383 Answers

Don"t worry, even the best techs overlook a thing or two during repairs. Lets go over some basics to determine where fault is located. You will need to do some simple tests. If there are leaks the compressor may not reach set pressure. I use soapy water on all connections and on the head/headvalve while compressor is running. Make repairs as necessary. If still low pressure, while compressor is running and has reached max obtainable pressure (still low 70 - 80 lbs), carefully place finger over intake port hole (remove filter). If the compressor is pumping normally but leaking there will be ample suction at intake and cause the compressor to speed-up when intake is obstructed with finger. If you feel plenty of suction and no visible (soapy water) leaks, then the problem is probably the cylinder /ring is not correctly seating and air is leaking past cylinder. Make sure that the cylinder /piston ring is properly alighed and that the lip on the vinyl ring is up toward the head. If you do not feel suction but rather air seeming blowing out of the intake, then the problem is the headvalve plate/reed valves are leaking. The reeds must seal perfectly on their seats and not bent or have obstruction. Replace as necessary. Only one other thing to check and that is the intank check valve. Easy to check. Run compressor till you have about 70 lbs in the tank then unplug compressor. Carefully loosen the inlet hose at checkvalve and listen for air leaking out of tank. If leaking replace checkvalve. Use caution when removing head to try and save the gaskets. Good luck on your repair and email if you have other question.

Posted on Apr 22, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I have a 6hp 33 gal aircomp i builds up to 100 should go to 250 wont shut off because not up to press can you help

Sounds to me likt you have a bad motor, or compressor. The compressor rings might be leaking by only holding 100 psi.

Aug 10, 2012 | Craftsman 33 Gallon Vertical Portable Air...

1 Answer

Craftsman Air Comp. 6 hp oil-less, 33 gal horz. tank - sounds really loud

Sources of noise from craftsman oil free compressors (could be Made by Campbell Hausfeld or Porter Cable) include loose fan, failing bearing/s on the piston rod and housing, failing seal ring on piston, air filter intake and loose motor mounts. With the housing cover off, check the fan blade for cracks or loose screw. Turn motor by hand till the piston is at top of stroke. Examine the cylinder for scratches close to top. If scratched, air is leaking past vinyl ring making noise and causing longer fill time. If everything looks ok, suspect noise coming from bearings. Hard to tell if bearings are failing by looking at them. I have seen many failures of the piston bearing on the crank (fairly easy to change, I use alternator bearing from auto parts ) , however, the bearing in the housing just behind the crank bearing is much harder to replacable. Good luck with your fix-it project.

Jun 11, 2012 | Craftsman Air Tools & Compressors

1 Answer

My air compressor won't get past 60psi but keeps running and isn't leaking air anywhere when I shut it off

Your problem lies with the valve plate and/or piston & cylinder. If one or more reed valves on the valve plate are cracked, bent or broken; pressure will only build to a certain point. If either the ring on the piston is damaged or the cylinder is badly scored it will not be able to compress air beyond a certain point. Unless the tank pressure reaches 120psi to 130psi the pressure switch will never turn the motor off.

Feb 18, 2011 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

I have a craftsman 30 gallon air compressor which loses air quickly no matter what tool i hook up to it. it just cant keep up with any tool and wondering if antone knew what could be wrong...

The first question is: does it build up pressure in a normal rate of speed? If not....or if it can't keep up with the demand you're putting on may be the piston ring. I owned an oil-less version Campbell Hausfeld compressor that wouldn't get up to operating pressure....turned out to be a torn plastic piston ring. hope this helps.

Dec 13, 2009 | Craftsman Air Tools & Compressors

1 Answer

No air output, but motor runs.

check your popoff valve first. it is the valve with the ring hanging on it. You will hear the air rushing.

If you don't hear any air rushing, you may have fried the piston rings or broke/chipped the piston(not your fault)..especially with oiless compressors

Jul 06, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

We have a 30 gallon; 6HP Craftsman Compressor; Single cylinder/oil free; 120 volt, 15 amp compressor. Mod. #: 919. 167311; Serial #: 2216185983. It has quit working, do you know what may be the issue and...


Jun 29, 2009 | Craftsman Air Tools & Compressors

1 Answer

Have 12 gallon / 1HP Craftsman compressor, accidentally ran it while it was low on oil....about half way low. It shut itself off. Then, I added oil and it started up. But now it builds pressure VERY slowly...

Not the motor, but probably the compressor shot. Heat from friction (due to running without oil) probably scored the cylinder walls, which allows air to escape past the piston and rings, making the compressor VERY inefficient. Some compressors have replaceable cylinders... Not sure if the very small ones do or not.

Jun 26, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Oiless SearCompressor will not reach shutoff pressure of 120 PSI

There are only two reasons it will not reach shut off pressure. 1, there is a leak inside or outside of the compressor, leaking air faster than the compressor will deliver it. ( Do you hear hissing when you first shut off the compressor? If so this might be your problem) Second, the compressor is worn out, or needs repair. - Valves, rings, diaphhram etc. Take it to a repair shop.

Good Luck

Mar 17, 2009 | Craftsman Air Tools & Compressors

Not finding what you are looking for?
Air Tools & Compressors Logo

Related Topics:

758 people viewed this question

Ask a Question

Usually answered in minutes!

Top Air Tools & Compressors Experts

John Trevino

Level 3 Expert

1383 Answers

Joe Garcia
Joe Garcia

Level 2 Expert

205 Answers

Brad Brown

Level 3 Expert

15441 Answers

Are you an Air Tool and Compressor Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides