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Air compressor help

Post in 'DIY and General non-hearth advice' started by mithesaint, Jun 3, 2012.

  1. mithesaint

    mithesaint Feeling the Heat

    Joined:
    Nov 1, 2011
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    448
    Loc:
    NW Ohio
    Not sure if this is the right forum or not, but I'll start here.

    I have a Husky Pro air compressor. It's about 4 years old, 30 gallon upright with a 2 HP motor. It worked fine until recently.

    Now, it doesn't want to run right. It starts up really slow, almost as if it's cold outside and needs to warm up. However, even after a few seconds, it still runs slow. After 10-20 seconds of running really slow, then it speeds up to normal, maybe even a little faster than normal, then it slows waaaaaaay down again, and then speeds up again, and then slows down again, etc.

    Something starts to smell pretty warm within a minute or so, so I have to shut it down. The belt seems fine. The motor spins freely when there is no belt attached, and seems to run normally without the belt. I can manually turn the pulley on the compressor relatively easily. I hooked it up to my 5500 watt generator, and it does the same thing. There is plenty of oil in the compressor.

    Where do I go from here?

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  2. heat seeker

    heat seeker Minister of Fire

    Joined:
    Feb 25, 2011
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    2,122
    Loc:
    Northern CT
    Does the motor have a starting capacitor? It may be bad if it does.
  3. DexterDay

    DexterDay Guest

    I had the same compressor. It came with a decent air tool kit.. Mine did the same thing (stalling, slow or no start) Was a lot worse when it was cold.

    After about 1.5 yrs of use, the Motor seized up.

    I bought a new 30 gallon 200 psi DeWalt compressor.

    Hope you get it fixed... To late for mine.
  4. fox9988

    fox9988 Minister of Fire

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    NW Arkansas
    Sounds like the belt is slipping. Can you describe the smell-rubber burning, electrical?
  5. greg13

    greg13 Feeling the Heat

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    CNY
    Does it start hard under a load? How about with an empty (0 psi) tank? If it is an under load condition (restart after a pressure drop) I would look at an unloader valve problem. If it is from 0 psi look for a motor or compressor problem. There is oil in the compressor isn't there?
  6. WES999

    WES999 Minister of Fire

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    Mass north of Boston
    You might try changing the oil in the compressor. My compressor was continually tripping the overload/breaker.
    I changed the oil, I used synthetic compressor oil from Lowes. Now it works fine, never trips out.
    Hard to believe that oil would make such a difference but it did. Simple to try.
  7. DexterDay

    DexterDay Guest

    The Husky doesn't take oil... Its a non serviceable motor. At least mine was a sealed system.
  8. mithesaint

    mithesaint Feeling the Heat

    Joined:
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    448
    Loc:
    NW Ohio
    We have different setup Dexter. I can add/change oil in mine.

    Anyway, it was a loose belt. Tightened it up and it worked fine. Never thought it would be the belt since it was only 4 years old with pretty light usage. Thanks for all the help.
  9. davmor

    davmor Member

    Joined:
    Oct 24, 2010
    Messages:
    200
    Loc:
    Northern Michigan
    I just had the same compressor go up in smoke. Motor seized up. Sounds like a common problem. I would be very careful with that compressor.
  10. MasterMech

    MasterMech Guest

    Replace or re-power by the sounds of it. Dunno if this motor will work but I'm guessing you can find something to work.

    http://www.tractorsupply.com/marathon-electric-reg-2hp-air-compressor-motor-3-450-rpm-3241176

    FWIW: I have a Craftsman Pro 25 Gallon Dual-Stage compressor that has served me well and hasn't showed any signs of slowing down. Requires no maint other than draining condensate from the tank occasionally. When/if I blow it up (and it does work in my shop...) I will replace it with something much bigger but for a homeowner/handyman this thing would be awesome. One of very few Craftsman products I can recommend in clear conscience.

    Alas - I see they no longer make my model 919.167780 :(

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