Spring Suspension Tandem Dump Truck Ride

Discussion in 'Trucks [ Eighteen Wheelers ]' started by OldRed98, Nov 30, 2023.

  1. AModelCat

    AModelCat Road Train Member

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    Air ride is the way to go. I haven't seen a logging truck, dump truck or oilfield truck built in the last 15-20 years with walking beam or springs. Ancient tech IMO.
     
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  3. W923

    W923 Road Train Member

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    Walking beam with rubber blocks is still going strong here and I mean new 2024 model trucks. I am still building my w9 with air ride hoping the ease of keeping drivers in it outweighs the tow bills and other frustration of air ride on a dump.
     
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  4. AModelCat

    AModelCat Road Train Member

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    Its rare to see anything but air ride around here. Even the tandem drive axle trucks that run off highway are mostly air ride too.
     
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  5. OldRed98

    OldRed98 Medium Load Member

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    Does anyone on here know about axle weight? I mentioned earlier about adding a drop axle. I’m considering adding a 3rd axle to my dump truck. I have room to do a full axle with dually tires.

    Here in Colorado we can gross 54,000 on a tandem dump truck. I’m guessing it’s 14,000 on steers, and 20,000 per tandem axle. If I added a full dually axle rated at 20,000, would that mean my truck could gross 74,000? I know there is the bridge formula to consider too.

    it gets a little confusing because I see most rear axle are rated at 17k but somehow we run 20k.

    Or what’s a good way to find this out?

    I’ve been looking at quad dump trucks and realize my truck is about the same length as many quads and I have an 18 foot bed. I just don’t have room to add 2 axles unless I move my fuel tank. 1 axle at 20k would be a good set up if I could gross 74k
     
  6. OldRed98

    OldRed98 Medium Load Member

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    Side view of my truck
     

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  7. AModelCat

    AModelCat Road Train Member

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    Never heard of 34k rears before. Most OTR stuff seems to be spec'd with 40k while vocational and heavy spec trucks are 46k lb rears.
     
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  8. SL3406

    SL3406 Medium Load Member

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    Based on what I could find CO. allows 53,000 on a tridem. So you would be better off with a lighter weight steerable lift axle. It looks like you're running 11r24.5's on the steer which will limit you to 14,000 due to the tires weight rating. You could gain some more payload by running wider tires up front and take advantage of the 20,000 CO. allows for the steer axle assuming you could get it loaded correctly to axle out.
     
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  9. OldRed98

    OldRed98 Medium Load Member

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    You are 100% right. 53,000... I said 54K (which is wrong).

    Thats a good idea to run the wider heavy rated tires. So you think I could pick up 20,000 by adding a steerable lift axle and heavy rated steer tires? That would put me at 73,000. My truck is double framed with a steel box. Currently weighs about 26,800 empty. 73,000 - 30,000 (Projected weight with new axle) means I could haul almost 21.5 tons. That would be a game changer for me.

    Although I'm seeing some others that haul aggregate advertising their new model quads can haul 26 tons. But I don't see myself spening 200K+ on a new truck.
     
  10. SL3406

    SL3406 Medium Load Member

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    In theory you should be able to carry that assuming your steer axle and springs can handle 20,000.
     
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  11. OldRed98

    OldRed98 Medium Load Member

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    Thank you for your help! I've been looking for another truck but the used truck market is still super expensive. Thinking about putting my money into the truck I have but still not excited about another year in a spring ride truck.
     
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