Air unloader Valve 2020 Cascadia DD13

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by KDHCryo, Jun 24, 2025.

  1. Jun 24, 2025 #1
    KDHCryo

    KDHCryo Medium Load Member

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    How much of a pain i the ### is it? Dealer wants 6 hours of labor for a 80$ part?

    1200 in labor
     
    KDHCryo, Jun 24, 2025
    KDHCryo, Jun 24, 2025
    #1
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  3. Jun 25, 2025 #2
    062

    062 Road Train Member

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    Depends on the condition of the truck and if it’s a short hood.
    A southern truck,if it’s not stuck in the hole,about a hour.
    A rusty northern truck maybe upwards of three.
     
    062, Jun 25, 2025
    062, Jun 25, 2025
    #2
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  4. Jun 25, 2025 #3
    KDHCryo

    KDHCryo Medium Load Member

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    Short hood, southern truck.

    My truck.

    Can you clean the piston and spring, regrease the seals? Reinstall?
     
    KDHCryo, Jun 25, 2025
    KDHCryo, Jun 25, 2025
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  5. Jun 25, 2025 #4
    062

    062 Road Train Member

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    Depends on what kind of condition the spring is in.
    I would just replace it with new since it’s already out.
     
    062, Jun 25, 2025
    062, Jun 25, 2025
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  7. Jun 25, 2025 #5
    KDHCryo

    KDHCryo Medium Load Member

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    Thank you
     
    KDHCryo, Jun 25, 2025
    KDHCryo, Jun 25, 2025
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    Bean Jr. Thanks this.
  8. Jun 25, 2025 #6
    BoxCarKidd

    BoxCarKidd Road Train Member

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    If the unloader is in the compressor head time is good. I would not go through all that and not replace the compressor. Do that compressor deal yourself and you would like to pay someone 12 hours. Just not at that labor rate.
     
    BoxCarKidd, Jun 25, 2025
    BoxCarKidd, Jun 25, 2025
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    KDHCryo Thanks this.
  9. Jul 16, 2025 #7
    KDHCryo

    KDHCryo Medium Load Member

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    Changed the unloader valve today (finally, been off 2 weeks working on the house). Did not remove the steer, just the inner fender. Wiggled my fat ### in there, used the bendix unloader valve kit, done in 3 hours.

    Spring on the plunger was broken in half, had to fish it out with the valve body.

    Builds air like new now. Saved $2000 in labor and parts.

    Dealer wanted to put a new compressor on, refused to just change the unloader valve.
     
    KDHCryo, Jul 16, 2025
    KDHCryo, Jul 16, 2025
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