Jost fifth wheel problem/warning

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Rideandrepair, Jan 14, 2026.

  1. BoxCarKidd

    BoxCarKidd Road Train Member

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    I do not thank it would be on you in this case but I would not want to drive it myself.
     
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  3. SmallPackage

    SmallPackage Road Train Member

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    I know where there is a a stack of 100 or so brand new Jost take off’s going to the scrap yard if you need parts.
     
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  4. Rideandrepair

    Rideandrepair Road Train Member

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    IMO the Truck needs a whole new fifth wheel. It’s not mine. Wondering why they’re not selling them if they’re brand new?
     
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  5. SmallPackage

    SmallPackage Road Train Member

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    OE Take off’s replaced by Hollands. Since the dealers discourage ordering a tractor without a fifthwheel to save on FET like you could in the past. They get sent with the cheapest standard crap and then get swapped out tor the good stuff cheaper at an aftermarket outfitter then the dealer will do. No one down here likes Jost.
     
    Last edited: Jan 17, 2026
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  6. MACK E-6

    MACK E-6 Moderator Staff Member

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    Here’s a look at the internal workings of one of these.

     
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  7. Rideandrepair

    Rideandrepair Road Train Member

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    That’s very helpful.
     
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  8. Bean Jr.

    Bean Jr. Road Train Member

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    4 of my 5 trucks have had this. As I have an older one, I'm not concerned about somebody reaching in and unhooking it, (truth is I'm not worried about it as I'm not a jerk in the truckstop). It's hard to pull, and I like it like that!
     
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  9. MACK E-6

    MACK E-6 Moderator Staff Member

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    To tell you the truth those make me nervous.

    On the Jost, the bar across the back side of the kingpin admittedly provides a bit of a sense of security.
     
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  10. rollin coal

    rollin coal Road Train Member

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    I liked my Jost never had any trouble with it.
     
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  11. Goodysnap

    Goodysnap Road Train Member

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    They are really a good option and usually close to 1/2 the cost of Holland for a full new top plate. The landing gear are also robust and compare really close to the Mark 5.
     
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