Spread axle dump valve

Discussion in 'Trucks [ Eighteen Wheelers ]' started by 7060, Feb 6, 2012.

  1. 7060

    7060 Light Load Member

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    Oct 2, 2010
    Missouri
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    I just bought a 1990 50 ton transcraft dropdeck spread. Im going to use it to haul a self propelled sprayer and water tank on the neck. Im going to have the 25k sprayer from the back axle forward 20 feet, and the 24k of water on the neck. I heard that some people add dump valves to the back axle to save the tires and help in turning. My question is, would it be safe for me to dump the rear axle with this weight on it?
     
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  3. JDP

    JDP Medium Load Member

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    Sep 25, 2011
    Dubuque, IA
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    As long as you only dump it when you're required to make sharp turns while backing up. I had dump valves on 30 spread steps but ended up taking them off because drivers kept forgetting to air the suspension back up and a lot of tires got ruined.
     
  4. 7060

    7060 Light Load Member

    55
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    Oct 2, 2010
    Missouri
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    The platforms for the sprayer are going to make me 12' wide so I thought I might be able to dump the rear bags to make tight turns into driveways and such. Right now Im starting from scratch replacing all the brakes, tires, hoses, wiring, and air bags so it would be easy to add it now. Would I need heavier bags for the front axle?
     
  5. Scrapper

    Scrapper Light Load Member

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    Jan 19, 2010
    Nashville, AR
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    All our trailers are spreads. Yes that will work well. Just make sure you air them back up and be careful. Just like JDP said it will ruin tires if your not careful. What we had happen was drivers taking off before they were aired up or not airing them up at and forgetting them. Would have been okay if they would have made sure the winches didn't slide back on top of the tire. The winch was what ate our tires up. It being yours and you doing the work, and you paying for it will make all the difference in the world.

    It will help you greatly turning, worst thing you can do to a spread is hook it around with both axles down. I think your bags should be fine. No faster than you'll be going, just easing around to make turns. We have one driver that thinks it doesn't hurt a spread to hook them around...loaded.....and quickly!!! . Hopefully he won't be with us much longer. I'm not a fan of welding front suspensions back together and putting in stiffer bracing because they don't know what they are doing to it! lol...not to mention the tires...:biggrin_25513:
     
  6. w900

    w900 Light Load Member

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    Mar 25, 2009
    Carlisle,Pa
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    I would also add a dump valve to front axle. Both of mine dump seperatly with different switches and I dump front axle unless it's tight turn. Really saves tires and bushings.
     
  7. Jfaulk99

    Jfaulk99 Road Train Member

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    May 16, 2009
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    I've never saw the benefit to dumping the front axle. I've had spreads with front lift axles to save tires/brakes but I can't remember a time I wished I could make my trailer turn like it was longer.
     
  8. w900

    w900 Light Load Member

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    Mar 25, 2009
    Carlisle,Pa
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    I figured it was only additional Peter Paul valve since he is already running wires and hoses. I pull 40' bucket and tire wear seems better for me dumping front over back unless you need to get short turn.
     
  9. SHO-TYME

    SHO-TYME Road Train Member

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    Dahlonega, GA
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    When I pulled a spread axle, when you dumped the air, they had a red light that came on so you knew you had let the air out.
     
  10. spiderx4

    spiderx4 Bobtail Member

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    Jun 8, 2012
    Santa Rosa, CA
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    Whats the best way to hook up a dump valve on the trailer to the truck?
     
  11. 25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    Sep 18, 2006
    the road less travelled
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    Dumping the front puts more weight on the drives than dumping the back, there are times that is an advantage, and the tail doesn't swing around at all then from pivoting on the front axle. That can also be an advantage.

    My company is getting rid of the dump valves because of misuse, just wish they would figure out a way to keep the dummies from tearing them up. Ours were set up so lights had to be on to dump them, I would line it up with it dumped and turn off the lights before a straight back. It also kept the suspension from blowing the undumped bags if you were careful about airing it back up when not needed to be dumped.


    Someone equipping their own I have no problem with, do it like you want for your own reasons.
     
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