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Auto 5th wheel jaw release help

Discussion in 'International Forum' started by earnies2, Mar 16, 2021.

Page 2 of 2
  1. Mar 17, 2021 #11
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Aug 26, 2014
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    I never saw them set up that way. My minds eye was seeing trailers sliding down the road. Thanks guys for the education that they only release with the brakes set.
     
    BoxCarKidd, Mar 17, 2021
    BoxCarKidd, Mar 17, 2021
    #11
    ChuckMartel Thanks this.
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  3. Mar 17, 2021 #12
    flood

    flood Road Train Member

    4,167
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    Dec 25, 2010
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    the way the system is set up. You have a switch on the dash that you pull or flip (volvo has a slide lock you must move before you can flip it) IF the trucks body computer see the brakes set (red park light) then it allows a servo to supply air to unlock the jaw (air ram under the hitch)... if you don't have the brakes set (red light) the computer WILL NOT allow it to work..
     
    Last edited: Mar 17, 2021
    flood, Mar 17, 2021
    flood, Mar 17, 2021
    #12
    mjd4277 and earnies2 Thank this.
  4. Mar 17, 2021 #13
    earnies2

    earnies2 Medium Load Member

    691
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    May 17, 2012
    Dedham, MA.
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    Mine works almost like that the brakes need to be set in order for the switch to work. When you push the switch it energizes the solinoid beside the transmission and sends air to the piston under the 5th wheel. There is also another valve on the frame near the rear end and I don't know what it does...
     
    earnies2, Mar 17, 2021
    earnies2, Mar 17, 2021
    #13
    mjd4277 Thanks this.
  5. Mar 21, 2021 #14
    mjd4277

    mjd4277 Road Train Member

    14,548
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    Oct 4, 2015
    Fitchburg,MA
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    Marten’s fleet has them as well. On the Freightliner it’s a pull handle release on the KW & Petes it’s a switch.
     
    Last edited: Mar 22, 2021
    mjd4277, Mar 21, 2021
    mjd4277, Mar 21, 2021
    #14
  7. Mar 21, 2021 #15
    earnies2

    earnies2 Medium Load Member

    691
    281
    May 17, 2012
    Dedham, MA.
    0
    Well I finally figured it out i had 2 problems. The first problem was the 2 way plastic valve at the solinoids by the transmission was installed upside down when the mechanic did the clutch and rear structure. The 2 nd problem was the inversion valve that is on the frame in back by the fith wheel that was corroded and stuck.. I replaced that valve and reversed the check valve and it works
     
    earnies2, Mar 21, 2021
    earnies2, Mar 21, 2021
    #15
    mjd4277 and BoxCarKidd Thank this.
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