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I have a Craftsman Sprayer Compressor Model No. 919.158221. The tank is full at 125 lbs. When i turn the control knob to pressurize the hose nothing happens?????? warren

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

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Posted on Jan 02, 2017

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SOURCE: husky comp on 1st start builds up 75 lbs and wont restart

Check the reset button on the motor to see if it tripped. The motor may be overheating. Some motors have an internal breaker and they have to cool off before they restart. Also check the pressure switch. Move the switch back and forth ( on and off ) and listen for a click. If it doesn't click with low to no air pressure then the switch is bad.

Posted on Dec 30, 2008

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SOURCE: Pressure won't build up in tank

Your compressor is the oilless type that incorporates a vinyl/teflon piston ring and a cylinder that is open from the bottom. Remove the cover and push the piston to upmost position. Look for scratches along the upper portion of cylinder. If scratched, compression is leaking thru ring and will not fill tank. Replace with Sears part #k0650 cylinder /piston ring kit to restore full power. While the compressor is apart examing the valve plate and reed valves for wear. If worn replace with part #z-ac-0032. Reed valves tend to crack or loose their shape reducing efficiency. If cylinder and ring are in fair condition, then most likely reed/valve plate is the problem. Good luck and email if you have more questions.

Posted on Feb 01, 2009

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SOURCE: once compressor reaches 125 lbs. pressure, the

Generally, the safety/relief is set to 140 to 160psi. The pressure setting is stamped on the side of the valve. Replace the valve if it will not hold stamped pressure(cost about $6 at Lowes Lumber).The pressure switch is usually set at the factory to 120 - 130 psi. The unloader part of the pressure switch will not release backpressure unless it reaches set cut-off. The 1/4 inch line attached to the pressure switch connects to air discharge tube at the intank checkvalve (brass valve). The safety valve should very rarely release pressure, only when pressure switch malfunctions and allows pressure to reach up to 160psi. The tank will hold over 300psi so dont worry about the 160psi safety. I am not sure about your exact model number or brand, however most small compressors work the same and share similar parts. For manuals to other similar compessors to to Here you will find manuals to dewalt and porter cable compressors. I prefer to use generic replacement parts from or from Lowes Lumber. These parts will cost less than factory replacement. If you need to replace the pressure switch, use SquareD brand from grainger. Watch fitting sizes and pressure range. Good Luck on your repair.

Posted on Apr 04, 2009

  • 89 Answers

SOURCE: tank will not build pressure beyond 25 lbs. Just runs


Posted on Apr 12, 2009

  • 16 Answers

SOURCE: Craftsman Air compressor while trying to fill tan...

the drain is closed in the out position

Posted on Jun 02, 2010

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1 Answer

I have a craftsman air compressor and I can't get it to build up pressure. What could be the problem?

Could be a faulty compressor its self.
Leaky hoses or lines. Mine had a tiny rust hole in the tank its self and had to get it welded.
Is your pressure setting up where they should be. mine has settings where you turn a knob to set pressure up or down for different operations. These are just ideas to help
Good luck.

Feb 07, 2015 | Craftsman Air Tools & Compressors

1 Answer

Compressor runs and sounds ok, but it only manages to show 20 lbs. It will not build air pressure and continues to run.

check air tank drain valve located on bottom of tank, if it is not leaking try adjusting air pres regulator (large black knob close to air hose connection.) the knob when turned in will increase the tank air pressure, if knob wont turn check that lock ring on bottom of knob to make sure it is disengaged. also check for air leaks in all lines and connections

Apr 16, 2012 | Craftsman 1 hp Air Compressor, 4 gal. -...

1 Answer

Evolv 2 brad nailer no power

If you can check nailer on another compressor. If it works check your compressor, if not the nail gun is in need of repairs. Otherwise, reading the two guages on the compressor, check that the pressure in the tank is around 100psi and the regulated pressure is between 85 and 90psi. If not, regulated pressure is adjusted by the knob on the front of the housing. With a blowgun on the end of hose, connect the other end to the compressor. If you don't get any air the regulator may be broken and not letting air through. If you have air at the blowgun the problem may be with the nailer.

Apr 08, 2012 | Craftsman Air Tools & Compressors

2 Answers

My regulator adjustment knob is not working and there is no air pressure on the psi regulator gauge. Air goes into the tank and the hose from the motor to the tank gets extremely hot. Is this normal for...

The air discharge hose will normally get very hot. When the pressure regulator valve fails, it may no longer give you air. As a temp measure you can get air out of the unit by removing the safety pop valve and installing a tee fitting in the port. On one side of t fitting reinstall safety. On the second port install a quick connect for full tank pressure. Make sure that there is not air in the tank by pulling on the ring of the safety before you take it off. Replacement parts are at or dewalt service center. Good luck

Jul 12, 2011 | Porter Cable C2002 150 Psi 6 Gal...

2 Answers

Compressor builds pressure to 60 lbs keeps running

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

Jan 27, 2011 | Craftsman 15 gal Air Compressor 3 hp UMC...

1 Answer

I have a craftsman recon oil 1 hp air compressor 3 gal, I do not have a manuel. It is model number 921.531101. how do i turn it on? how do I use it. how do i hook up the hoze? anything else? thanks...

Hi, Larry, W/D here.
Locate where the electrical cord goes to the compressor (a gray or black box). That is your pressure switch, and has a lever next to it, usually with a red rubber tip on it. Flipping the lever turns it on. To hook up the hose, locate the female hose connection at the regulator. It is either the type where you slide the collar back and insert the air line, or the type where the collar is already back, and locks into place when the hose is pushed in.
The regulator on this model is adjustable; the gauges are separated by a knob between them. The knob allows you to adjust the output pressure. The inner gauge, closest to the compressor, shows the pressure on the tank, and the one closest to where tha hose takes off is the "working" pressure. Don't adjust the pressure unless there's a need to. Between the gauges is a small cylindrical brass piece with a ring in the top of it. This is the pressure relief device. It will open if the compressor fails to shut off when it is supposed to. You don't need to do anything to that either.
If the compressor runs a bit, it will produce moisture from the heat of compression, and the moisture will collect in the tank. It is a good idea to drain the tank down from time-to-time to keep the moisture from rusting out the tank. there is a small valve on the underside of the tank for this purpose. When you know that you are going to use the compressor a lot, you can crack the valve, just a bit, to keep the moisture drained.
This should get you started.
Best regards, --W/D-- Please feel free to rate this solution, and let me know if I can help further.

Jan 26, 2011 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

My compressor builds to 125 psi then shuts off like it should then when the pressure is released the compressor wont start back up. Sometimes it will attempt to start and it sounds like the motor is...

When a compressor reaches set pressure, there should be a release of air from discharge hose thru the unloader. This release of air unloads the compressor head pressure. The unloader is usually located within the pressure switch. Easy to check. Follow discharge hose from compressor head to tank. There should be a brass/steel checkvalve at the tank. The checkvalve allows air to enter tank, however not allow air to be released back into discharge hose. If this valve is leaking, air will be released from the unloader constantly. Follow 1/4" tubing from checkvalve to unloader and listen for leaks. Repair as needed. If air is not leaking from checkvalve then check unloader mechanism with-in pressure switch. Parts are available at Good luck

Aug 25, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Setting the max pressure on a Craftsman compressor

The pressure setting for on off of the compressor , and the operating pressure don't have to be the same. You should have two gauges. One for tank pressure, and one for operating pressure. Turn the large knob on the operating pressure, ccw to decrease and cw (clockwise) to increase. You can download a manual for your compressor at:

Jul 18, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Air compressor pressure not regulating

Usually you cannot adjust the cut out pressure of the tank/motor itself, this is why they have regulators, which regulates the pressure flowing down the air lines (regulators like these dont regulate actual tank pressure cutout). To regulate air flow using the regulator knob, you actually have to have air flowing through the hose while you make the regulator/pressure adjustments as regulators regulate pressure DOWNSTREAM from the actual regulator itself.. so air flowing through is a must. Attach an air blower or something similar and let air start flowing through the hose. Now turn your regulator knob in the "-" direction to decrease regulated pressure. It is best to bring pressure all the way down to "0" first, then open the regulator up (by turning to the "+" side) and pressure will rise until you get to the desired pressure needed for the air tool in use. The tank pressure will still be between 80-125 PSI as the motor regulates and keeps the pressure in the tank between these values automatically, but your line/hose air flow pressure will remain at the regulated pressure (say 40 PSI or whatever you set using the regulator knob).

Hope that helps and makes sense.

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Jun 18, 2009 | Makita Factory-Reconditioned 2.5 HP Air...

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