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1 Pushrod on slack adjusters longer than the rest

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by HP510, May 24, 2023.

  1. May 24, 2023 #1
    HP510

    HP510 Bobtail Member

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    One pushrod on my slack adjusters are longer than the other 3 on axle 2 and 3. All the brakes are adjusted. Brand new truck 90k miles. When parking brakes are applied it all looks the same, does the pushrod that’s sticking out need to be cut to length?
     
    HP510, May 24, 2023
    HP510, May 24, 2023
    #1
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  3. May 24, 2023 #2
    AModelCat

    AModelCat Road Train Member

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    If they are all correctly adjusted and look the same with the brakes applied I'd lean towards the one with the longer pushrod not fully releasing.
     
    AModelCat, May 24, 2023
    AModelCat, May 24, 2023
    #2
    HP510 and Rideandrepair Thank this.
  4. May 24, 2023 #3
    HP510

    HP510 Bobtail Member

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    My bad I meant when parking brakes are released it all looks the same but when it’s applied one is longer than the rest.
     
    HP510, May 24, 2023
    HP510, May 24, 2023
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    Rideandrepair Thanks this.
  5. May 24, 2023 #4
    AModelCat

    AModelCat Road Train Member

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    Sounds like the longer one isn't properly adjusted.

    Measure the stroke on each chamber.
     
    AModelCat, May 24, 2023
    AModelCat, May 24, 2023
    #4
    HP510 and Rideandrepair Thank this.
  7. May 24, 2023 #5
    HP510

    HP510 Bobtail Member

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    Ok I will check tomorrow and let you know how it goes
     
    HP510, May 24, 2023
    HP510, May 24, 2023
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    Rideandrepair Thanks this.
  8. May 25, 2023 #6
    HP510

    HP510 Bobtail Member

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    You’re right I had to adjust it
     
    HP510, May 25, 2023
    HP510, May 25, 2023
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    Rideandrepair and Bigtruckdrivah Thank this.
  9. May 27, 2023 #7
    HP510

    HP510 Bobtail Member

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    How often should slack adjusters need adjusting? One went out of place a day after I adjusted it but the other 3 seems to be okay. Is that normal? I greased all my slack adjusters
     
    HP510, May 27, 2023
    HP510, May 27, 2023
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    Rideandrepair Thanks this.
  10. May 27, 2023 #8
    AModelCat

    AModelCat Road Train Member

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    Auto slack adjusters should never require adjustment if they are set up correctly and maintained. Besides whenever they've been backed off to do brake repairs of course.

    If its not keeping adjustment it is more than likely time to replace it.
     
    AModelCat, May 27, 2023
    AModelCat, May 27, 2023
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    Rideandrepair, HP510 and Big Road Skateboard Thank this.
  11. May 27, 2023 #9
    AModelCat

    AModelCat Road Train Member

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    Should still regularly check that they are staying in adjustment though.
     
    AModelCat, May 27, 2023
    AModelCat, May 27, 2023
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    Rideandrepair, HP510 and Big Road Skateboard Thank this.
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