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Sullair compressor starting issues

Discussion in 'Other Construction/Demolition Equipment' started by notyepcars1, Oct 10, 2021.

  1. notyepcars1

    notyepcars1 New Member

    Joined:
    Jun 6, 2020
    Messages:
    3
    Location:
    MN
    I have a sullair 80 GPQ-onan compressor that I recently bought. When I start and hold the override button for 20 seconds and release, the engine dies. Will start right back up, but dies when I release override button. In attached pic, instructions says you hold the override until engine oil pressure reaches 20psi. Any ideas? Can’t find anything on this model. Thanks
     

    Attached Files:

  2. Junkyard

    Junkyard Senior Member

    Joined:
    Jun 5, 2016
    Messages:
    3,211
    Occupation:
    Field Mechanic
    Location:
    Claremore, OK
    Does it have any low water sensors or low oil level in engine or compressor? I run into that on some of the compressors we rent. Check wiring, sensors etc
     
    Vetech63 likes this.
  3. Coaldust

    Coaldust Senior Member

    Joined:
    May 10, 2011
    Messages:
    1,168
    Occupation:
    Cargo Tanks, ULSD, RUG, Methanol, LPG
    Location:
    North of the 60
    There are a number of safety switches in the start circuit prone to failure. The best way to start is to familiarize yourself with the circuit. A wire diagram will be your best friend. I’ve had good luck finding Sullair wire diagrams on the interwebs.
     
    Vetech63 likes this.
  4. MarshallPowerGen

    MarshallPowerGen Senior Member

    Joined:
    Nov 27, 2017
    Messages:
    265
    Occupation:
    Diesel & Generator Mechanic
    Location:
    Coeur d'Alene, Idaho
    Most like going to have low oil pressure shut off for the engine and compressor. If oil levels are good, you'll need a meter to ohm out sensors and see if either are bad, then follow wiring back and see where there's an issue. That should be a very simple machine to diagnose. Any chance of a wiring diagram somewhere under the lid or behind control door?