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Craftsman Air Compressor Model # 921.166380 WONT START

WONT START JUST HUMES A MIN AND THEN KICKS THE BREAKER DO YOU THINK IT IS THE 2 CAPS

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1383 Answers

SOURCE: air compressor flips breaker before it will start?

Air compressors tend to draw more power as they age, however, will not trip breaker unless some malfunction. Here are some simple tests. Unplug compressor and turn the pump by hand, you may have to remove a cover to do this. It should turn freely; any resistance could be failing bearing (would make noise) unloader/check valve leaking allowing back pressure to pump, or failed start capacitor/start winding. Easy test for checkvalve. With pressure in tank loosen discharge hose at tank and check for air leak. Check valve should hold pressure in tank. Replace as needed. Failed capacitor/s will cause high amp draw. Remove from circuit and test. UF reading should be within 95% of printed rating. Finally, most air compressor motors have two windings, start and run. Power to windings is controlled by flyball switch inside rear of motor. This switch has contacts that can stick in start position and cause high amp draw. Examine windings for signs of overheating. Copper windings generally have color of new penny. Very dark brown windings bad news. Gook luck

Posted on Jan 06, 2009

  • 1383 Answers

SOURCE: Oil capacity for craftsman air compressor circa 1978 model #106..

I have a 2hp craftsman air compessor with a two cylinder pump, Here is the info from my manual as far as oil capacitity:

Remove oil fill plug and slowly add
a compressor oil until it is even with the
top of the oil fill hole. NOTE: Do not
allow oil to be lower than 3/8"
from the top at any time. When filling
the crankcase, the oil flows very slowly
into the pump. If the oil is added too
quickly, it will overflow and appear to
be full. NOTE: Crankcase oil capacity is
approximately 16 fluid ounces.

I buy my compessor oil from Lowes in the tool department. It comes in 16oz and sells for about $3. I wouldnt worry about how many ounces it holds but rather that the oil level is to top of filler hole. Lowes also sells a synthetic oil for about $7 and is recommended for severe conditions (hot / cold / used all day). Good Luck!

Posted on Apr 26, 2009

  • 68 Answers

SOURCE: i have a electric air compressor craftsman 3.5hp

The pressure switch controls the cut-in and cut-out points for the motor. Some switches have a differential adjustment besides the pressure adjustment. The differential controls the spread between cut-in & cut-out, (say in at 80 PSI, out at100 PSI)

Try looking for these if you didn't get a manual.

Good luck

Posted on Apr 27, 2009

  • 132 Answers

SOURCE: Air compressor that trips my circuit breaker

Most garage curcuits are 15 amp GFI plugs and they won't run most compressors. Drain all of the air out of the tank and see if it runs. If so then you are going to have to add a 20 amp plug for your pump.

Posted on Jan 17, 2010

  • 15 Answers

SOURCE: i have craftsman air compressor model number919-167310

is this new, has it ever run? perhaps the breaker isn't large enough for the units required amperage, maybe the breaker is just bad. Have you tried different recepts? Check the nameplate for the amp requirements and make sure the breaker is big enough

Posted on Mar 19, 2010

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Just fixed my compressor. It would start ok when the tank was empty but trip the breaker if it tried to start with pressure. Searched and read about weak caps, or problem with check valve or pressure switch leaving pressure in the pump head, etc. Turned out that the black plastic box which holds the 2 start up caps and is attached to the end of the motor with 2 screws had cracked on the bottom. The black box had tilted out enough that the start up caps switch was not engaging. Pushed on the lower part of the box and it started perfectly. Fixed it for the cost of some 2 part epoxy. Maybe not your fail, but definitely worth checking out first.

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1 of 2 things #1 the pressure releive valve that lets the pressure of the pump when it kicks off is stuck closed so what is happening is when the compressor kicks back on its under a load and trips braker. #2 your braker is to small for the compressor.

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Installed new breaker just for the compressor and it still only runs for a second or two and kicks breaker


You need to find out how much amperage the compressor pulls and make sure the wiring and breaker are sized correctly.
If they are sized correctly then you likely have an issue with the motor or the compressor itself causing the breaker to operate.

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try this. When compressor shuts off. TURN OFF POWER. then spin the compressor backwards or forwards until it is off the compression stroke. Turn unit back on. If it doesn't blow the breaker, then it is worth looking into the type of compressor (pump) you have. Many have a "reed valve" and that might be failing, holding the compressor itself under load when it shuts off so that on restart it is under heavy load and the motor draws too many amps to get it started hence blowing the breaker anyway hope this helps

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1 Answer

I have a 25 gal. craftsman oilless air compressor. Runs for about 1/2 a minute & than kicks the breaker out.


Hello babeaton, several things can cause that, but, the most common thing is the regulator. let it run again and right ofter it kicks off feel the power cord and see if it's warm to the touch, if so it likely is the regulator. Breakers operate based on the amount of heat generated from current running through the cord/wires.
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Hi there. Plug your compressor in as close to your circuit box as you can on a circuit that is dedicated to that outlet

What is happening is this. You have a 15 amp circuit and a 15 amp draw on your compressor. No wiggle room at all. If you need to get the air a long ways use air hose and never an extension cord. Joe

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