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Sullair 375 Compressor with John Deere Diesel

Discussion in 'Other Compact Equipment' started by Dave Varabioff, Apr 26, 2021.

  1. Dave Varabioff

    Dave Varabioff Member

    Joined:
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    Messages:
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    Location:
    Mariposa
    I have a compressor, about 8k hours. Running fine for past 3 years and now have a weird issue and hoping for some insight.
    I can fire it up first thing in the morning and it will run about 30 minutes or so, then it just dies suddenly like its a fuel issue (in fact it REALLY seems like a fuel issue because I cant restart it right away), I need to let it sit for about 30 seconds and then it will restart, but when I flip the switch to run it dies IMMEDIATELY.

    I am assuming "overheat" on compressor, I am not a mechanic, I am a gold miner lol. I have changed the compressor oil (it was in fact pretty dark color so indicative of over heat) and filters.

    Any other insight? What to look for, what can I do?
    Thanks tons!
    Dave
     
  2. Coaldust

    Coaldust Senior Member

    Joined:
    May 10, 2011
    Messages:
    958
    Occupation:
    Cargo Tanks
    Location:
    Wasilla and parts unknown
    Dave,

    I used the same model of compressor for tank testing in Yakutat for a few seasons and spent way too much time keeping it running. I got fairly familiar with it.

    I would first determine if you are dealing with a fuel problem or an electrical problem with the shutdown system.

    Bypass the electrical circuit to the fuel injection pump run solenoid with a fused jumper wire to the battery and see if it works OK.

    Then report back. But, I know gold miners. You will run it that way until freeze up. Happy diggin’ !
     
    Jonas302 likes this.
  3. Dave Varabioff

    Dave Varabioff Member

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    Location:
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    Thanks a ton, yes we been working on it today and I strongly think fuel issue, we do get 4 flashes for "Low speed" as the error on the shut down module.
    There was a "Black Gunk" (almost like tar) in the bottom of the tank and the first fuel filter.
    We have replaced both fuel filters and cleaning out the lines and injectors.
    We crack the injectors, bleed the air, it fires up and runs for about 1 minute then stops (Like its run out of fuel) but it could be the electrical.
    Will try your trick if cleaning lines doesn't fix it!
    And apparently you were a gold miner once too ;-) (takes one to know one lol)

    Dave
     
  4. Coaldust

    Coaldust Senior Member

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    Occupation:
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    Wasilla and parts unknown
    Dave,

    Gold Fields Operating Company! Golconda NV.
    Good luck with your troubleshooting.
     
  5. Dave Varabioff

    Dave Varabioff Member

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    Location:
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    Colorado Quartz Gold Mine
    in California
    Rare specimens
    Anyways, it was electrical, jumped the fuel solenoid and its fixed! So what's the "REAL" fix?
    Speed Sensor?
    Thanks for the input at least we can run for a day or 7 until I fix it for real!

    dave
     
  6. Coaldust

    Coaldust Senior Member

    Joined:
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    Occupation:
    Cargo Tanks
    Location:
    Wasilla and parts unknown
    That’s good news! At least you have it narrowed down. There are a few safety switches that shut off the engine in case it overheats or low oil pressure and a couple other devices that are related to the compressor.

    You need to take the wiring diagram and test each switch and do a good visual inspection of all the connections of the shutdown circuit.

    I might have a diagram. I’ll look for it.

    Check the oil pressure switch, first. It’s located near the oil filter on the side of the block. Spray it clean with BRAKLEEN and make sure the switch isn’t leaking oil.
     
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  7. Dave Varabioff

    Dave Varabioff Member

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    Excellent! Thank you, we will "run" today and fix after hours, lol....yea Gold Miner[​IMG]
     
    Coaldust likes this.
  8. Dave Varabioff

    Dave Varabioff Member

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    Location:
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    heres another epic piece i found[​IMG]
     
    Coaldust likes this.
  9. Dave Varabioff

    Dave Varabioff Member

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    So I did switch out the sensors and it does seem like there is an issue. The sensor is now working properly in that when we fire up the lights for the SSAM are not flashing (they were before), we can run about 3 hours and then is shuts down with the "Compressor Temp" flash warning and YES its VERY warm. In fact the oil tank feels hot, and I do hear a gurgling sound (almost like an overheated car radiator) but its the oil tank. My thoughts are that it must be the "in tank" oil filter? We did just change the oil recently but not the in tank filter. I am open to other things to look at as well?

    Thanks
     
  10. Coaldust

    Coaldust Senior Member

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    Occupation:
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    Wasilla and parts unknown
    Might not have enough air flow through the unit, plugged radiator, plugged vents, fan belt slipping, running with the doors open.
     
    Paul Council likes this.
  11. Dave Varabioff

    Dave Varabioff Member

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    Location:
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    Uhhhhh, figured it out. My "guy" recently did a service on it (at my request). All new filters, oli, compressor oil. The compressor was tilted to the right (uneven ground) and when he refilled compressor oil because of the angle of the machine put in 3.5 gallons too many....when I realized he probably over filled it we leveled the machine, drained the excess and we are back to "golden" :)

    Thanks for the input!

    Dave
     
  12. Coaldust

    Coaldust Senior Member

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    Occupation:
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    Wasilla and parts unknown
    Good to hear! Thanks for the update. Time to get diggin’.
     
  13. Dave Varabioff

    Dave Varabioff Member

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    Indeed! In fact tomorrow (Mothers day) I have the main USA minelab rep bringing me the newest and latest and greatest detector!

    Mlgdave