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Possessed Volvo 780 air compressor

Discussion in 'Ask An Owner Operator' started by Midnightrider909, Apr 25, 2018.

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  1. Apr 25, 2018 #1
    Midnightrider909

    Midnightrider909 Road Train Member

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    We just spent the day at the Salt Lake City Volvo dealer trying to get this diagnosed and fixed but to no avail. The issue is the compressor will kick on at seemingly random times while you are driving. If the air pressure gets down to 100 it will kick on and run it up to about 130 and stop which is normal and expected but it will also kick on off when the air pressure needle is above 120. On the trip down from Washington and it seems like the average time was every three minutes or so it would kick on for about 20 to 30 seconds. Why would the compressor come on when it is not needed? It does not do this while it is parked all me while it is rolling. Last night I drove the tech around the yard at the Volvo dealership and it kicked on three times in three minutes never once coming near 100 psi. The supposed master technician at Volvo says there is nothing wrong with the truck.
     
    Midnightrider909, Apr 25, 2018
    Midnightrider909, Apr 25, 2018
    #1
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  3. Apr 25, 2018 #2
    beastr123

    beastr123 Road Train Member

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    change the governor on the firewall and check the line from the compressor to the governor. a rub that leaks down in that line when moving is what it sounds like to me but a governor is cheap insurance.
     
    beastr123, Apr 25, 2018
    beastr123, Apr 25, 2018
    #2
    Midnightrider909 Thanks this.
  4. Apr 26, 2018 #3
    Jacoooooooo

    Jacoooooooo Heavy Load Member

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    It might also be an air dryer. Don’t worry, if you’re at Volvo they will probably replace it anyway $$$
     
    Jacoooooooo, Apr 26, 2018
    Jacoooooooo, Apr 26, 2018
    #3
    Midnightrider909 Thanks this.
  5. Apr 26, 2018 #4
    Midnightrider909

    Midnightrider909 Road Train Member

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    Volvo had it for hours and never replaced it. They claim there’s nothing wrong. I also asked them about the excessive clutch slippage warning that it would give me on occasion and they looked into it and said that was a result of driver error and billed me for a half hour of their time to figure that out. $92 and tried to tell me I was driving with my foot on the throttle and the other on the brake. I don’t do that ever and why would I anyway?
     
    Midnightrider909, Apr 26, 2018
    Midnightrider909, Apr 26, 2018
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  7. Apr 26, 2018 #5
    Jacoooooooo

    Jacoooooooo Heavy Load Member

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    If it’s ok, than maybe it is. Carry on. I’d rather take that than few $k worth of repairs.
     
    Jacoooooooo, Apr 26, 2018
    Jacoooooooo, Apr 26, 2018
    #5
  8. Apr 26, 2018 #6
    Doing_flatbed_nc

    Doing_flatbed_nc Medium Load Member

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    If you are an O/O, stay away from Volvo dealerships as much as feasible.

    Also, and I ask this sincerely: why are you concerned about the compressor working too much? I'm not being a smart arse. I just want to know what led you to take your truck to a dealership. Does the overactive compressor affect the air in the tanks in a negative/ dangerous way? If so, how?

    I ask because I've never had compressor problems with my volvo. Lots of air leaks last winter that were chased down and fixed but no overactive compressor problems.
    Let me know what to look for.
     
    Doing_flatbed_nc, Apr 26, 2018
    Doing_flatbed_nc, Apr 26, 2018
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  9. Apr 26, 2018 #7
    Midnightrider909

    Midnightrider909 Road Train Member

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    I’m worried it will wear out prematurely and strand me somewhere with a costly tow bill. A new compressor also costs about $3500. Do you know a better place to get work done if Volvo dealers are no good?
     
    Midnightrider909, Apr 26, 2018
    Midnightrider909, Apr 26, 2018
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  10. Apr 26, 2018 #8
    Doing_flatbed_nc

    Doing_flatbed_nc Medium Load Member

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    Is your volvo under warranty? If so, I understand your vigilance.

    A better place than Volvo? Anywhere. Every schmuck company with twenty volvos or more has a break down and sends them to the dealer. Volvo dealerships are backed up and they charge full price/ no negotiation. There's no need for negotiation because they are backed up.

    I google diesel truck repair for the area I need and start calling, when I need service outside of my home base. Even the bigger companies have wiggle room. Snider tire is kinda big in the southeast and I've found that they always move a bit on pricing. You just have to ask and have some reason(s) to ask for a lower rate.
     
    Doing_flatbed_nc, Apr 26, 2018
    Doing_flatbed_nc, Apr 26, 2018
    #8
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  11. Apr 26, 2018 #9
    KB3MMX

    KB3MMX Road Train Member

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    My truck .. 2016 Volvo 780 XE has this EXACT same issue at random.... I have noticed with a fresh dessicant cartridge it does it far less ... Very strange.

    The compressor will kick on and fill, even with 120+ psi still on the gauges. I suspect a air leak from the iShift line may be contributing .. will keep trying to find the cause ..
     
    KB3MMX, Apr 26, 2018
    KB3MMX, Apr 26, 2018
    #9
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  12. Apr 27, 2018 #10
    windsmith

    windsmith Road Train Member

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    I've posted this before. Follow the steps in the attached PDF, and you'll find the problem.
     

    Attached Files:

    windsmith, Apr 27, 2018
    windsmith, Apr 27, 2018
    #10
    dirthaller Thanks this.
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