compressor playing up

  1. 123hotchef Member

    Messages:
    7,412
    Location:
    Kent
    My compressor has started playing up.

    It builds up to about 100psi then the motor starts struggling and just sits there trying to turn.

    Any ideas people. it is a 3hp belt driven compressor the oil is only a year old and it does not get much use anymore.
     
  2. Cobbler

    Cobbler Codger bodger

    Messages:
    4,263
    Location:
    Gloucestershire UK
    Motor burnt out, a coil gone so it doesn’t develop full power possibly?
     
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  3. WorkshopChris Forum Supporter

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    4,216
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    South East Essex
    What's the capacitor configuration?
    Cap Start. (1)
    or Cap Start & Cap Run. (2)
     
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  4. 123hotchef Member

    Messages:
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    Location:
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    surley if the motor was burnt out it would not get up to 100psi?

    Chris I am not sure let me check I think there is only one cap
     
  5. Cobbler

    Cobbler Codger bodger

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    Don’t know, just floating ideas about.
     
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  6. 123hotchef Member

    Messages:
    7,412
    Location:
    Kent
    Looks like the one cap does both does both is that right chris
     
    • 20190908_095716.jpg
    • 20190908_095738.jpg
  7. WorkshopChris Forum Supporter

    Messages:
    4,216
    Location:
    South East Essex
    Yes one cap, so a standard capacitor start motor, might be worth testing to confirm it's still within tolerance. But if the cap was faulty I would expect problems way before 100psi.
    Looks like you have a loose or high resistance connection to the thermal overload but wouldn't be the main problem.
    Does it feel ok when turning over by hand? any hot bearings on compressor or motor?
     
  8. sako243

    sako243 Member

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    445
    Location:
    My mansion in Wales
    If the cap was failing it would struggle to start. Given it's struggling when under load then there's extra resistance from somewhere - either mechanical or as suggested partially burnt out motor. Measure the ohms across the windings - should only be a couple at most, if they're higher then the winding is toast.
     
  9. brightspark

    brightspark Member

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    26,339
    Location:
    yarm
    the conector near that white block looks like its been overheating
     
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  10. 123hotchef Member

    Messages:
    7,412
    Location:
    Kent
    yes I thought that about the connector on the overload block it looks bit toasty!

    I will try turning it over by hand.

    I have had my two compressors hooked up together for ages now I disconected them to work on this fault and it worked ok today well just up to max pressure I do need to try using it though.
     
  11. Mine was was doing the same once and changing the oil cured it, is there a faulty non return valve between the pump and tank?
     
  12. 123hotchef Member

    Messages:
    7,412
    Location:
    Kent
    the NRV was new last year so I hope not
     
  13. angellonewolf

    angellonewolf Member

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    Location:
    bristol england
    ^^^^ better that than a new motor :whistle:
     
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  14. 123hotchef Member

    Messages:
    7,412
    Location:
    Kent
    dam right the unloader was new too and that is working fine
     
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