Question about Craftsman 3 gal. Air Compressor, 1.5 hp, Horizontal k

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Pressure regulator gauge wont work on my 3 gal. air compressor how do i fix it or where do i get a new one (craftsman) i also lost my book , how often do i change the oil ?

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  • bluesteel528 Mar 15, 2009

    thank you, but how do i know if the gauge (dial) it self is bad and just wont register or if the entire pressure gauge unit is bad and need replaced or do you just replace the entire unit ...

  • bluesteel528 Mar 15, 2009

    by the way it is direct drive and model number is 921-153-101

  • bluesteel528 Mar 15, 2009

    how do i know if its the pressure gauge or the regulator that is bad ? the gauge wont register any pressure readings at all when i am using the compressor, but my nail gun works fine , if anything it shoots a little to hard.

  • Dominic
    Dominic May 11, 2010

    Moreover, if your compressor has an Air Intake Filter, it
    should be cleaned on a weekly basis (assuming you are using
    the compressor about 3 days a week). When the filter starts
    to develop debris that is becoming harder to clean out, or
    you notice any tears or holes in the filter, the filter
    should be replaced.

  • Dominic
    Dominic May 11, 2010

    In a rotary screw compressor, oil should be
    changed about every 7000-8000 hours. This depends on the
    type of compressor you purchase. For a Reciprocating air
    compressor, generally you would change the oil approximately
    every 3 months. For a more accurate time frame, I'd need your model number to find the recommended schedule for your

  • Dominic
    Dominic May 11, 2010

    So, you're using an oil based horizontal tank unit ; Belt Driven? Horse Power? Max PSI? If you have the model I can pull up the spec sheet.



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  • 167 Answers

If the regulator is inline you need de-energize the compressor to remove the regulator.

Sears parts and service:

Compressor Information:

Wiki Buying Guide for Craftsman Regulators:

Sears / Craftsman Forum & Repair Information:

3rd Party Regulator Retailer:

If you feel that your problem is too serious for you to repairyourself, please contact a licensed/certified technician.
If you wish,you can call Sears HomeCentral at 1-800-4-MY-HOME tomake an appointment for a technician to visit. (There is a charge forthis service.)

Posted on Mar 11, 2009


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it seems like you might be adjusting a valve before the regulator. the outlet pressure from the compressor vessel should remain celatively constant. if you are adjusting the pressure whilst using the airtool and when you stop the regulator gauges return to/or close to/ the 150 PSI then this also points to you not adjusting the regulator.
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Does it run? Does it stop running? Does the pressure gauge read anything at all? Is there a regulator on it? Can you take the reg off? A bunch of things to check, get it running and let me know what you find, and I will try to tell you what's next.

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1 Answer

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I have the same make/model. Connect a device to your air line (impact, blow gun, doesn't matter anything that will use air). Operate the device and note if the pressure on your output gauge falls, and then rises back to 20# when you let off of the device. If it does, this indicates that your regulator is either defective, or it is adjusted too low. Try adjusting the regulator knob, operating it in both directions, and note the pressure on the output gauge. If you can get it to rise, you're home free!

Regards, --W/D--

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