Fifth Wheel Placement

Discussion in 'Experienced Truckers' Advice' started by Sportster2000, Mar 5, 2011.

  1. 123456

    123456 Road Train Member

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    Bobtail weight means nada.......

    if you can get 12.3-12.5...you're good.

    Best to shoot for 12K, but 12.3-12.5 is much more realistic.

    Unless you want to change out the front axle, tires, wheels, etc for 20K...which is ridiculous

    That 5th wheel is right where it should be.
     
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  3. rambler

    rambler Road Train Member

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    Put your fifth wheel to the rear. Then take off some weight from your drives by using the trailer tandems. Then report back with what you find.
     
  4. mitchtazz

    mitchtazz Road Train Member

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    no there's no law about moving the fifth wheel brackets.. i wouldn't try to do it myself though. most frames are heat treated, and if you weld or drill them wrong it makes them weaker and more prone to fatigue/stress fractures.

    so much for your situation, it seems like that truck wasn't set up to pull short trailers which is why so much weight is getting put onto the steers.. my truck pulled van originally, and now i'm running flatbed spread axle and a 36in king ping setting. everytime i scale the weigh master questions me about it.. i just shrug and tell them it's never been over so i pay it no mind.
     
  5. Allow Me.

    Allow Me. Trucker Forum STAFF Staff Member

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    What I'm talking about is approach the scale, stop about 2' before you get the steer axle on the scale. Drop your landing gear, pull your pin,pull out the tractor so the steer axle is on the scale and the kingpin is rearward of the plate, raise the landing gear, now the trailer is sitting on the plate and the kingpin is just an inch rearward of the plate (not connected). Now weigh the steer axle. If it's lighter, then you can re-bolt the 5th wheel rearward. You could also have the trailer kingpin in front of the plate with landing gear up and weigh the steer axle. What I'm describing lets you see what moving the 5th wheel might do without actually doing the labor part. But I'm guessing you have a short wheelbase power unit along with a short trailer and are trying to load it heavy.
     
    Sportster2000 Thanks this.
  6. Sportster2000

    Sportster2000 Road Train Member

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    I have a long wheel base truck with a shorter trailers and yes I am trying to load it heavy. Trying to keep it around 75,000 lbs.
     
  7. bleach driver

    bleach driver Light Load Member

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    if your tractor steers are weighing over 12k bobtail , something is definately wrong , ( like your truck was originally built for hauling michigans with a 20 k front end , or somone put a crane on the chassis, fuel tanks too far forward , or your truck was equiped with floaters ) yes you can legally move the fifth wheel back on the frame we do it all the time , BUT! you should not put the center pin any farther back than the centerline of the tandems as it will over load the drives and not necisarly take weight off the steers ( the airbags and equalizers on the springs prevent this ) and will cause the front axle to lift off the ground when you hit a big bump if its near the rear axle centerline , and you might not be able to bridge the load due to the trailer length , rule of thumb every 3 inches back =500 pounds you take off the steers , first though you need to find out why its overloaded on the front axle .
     
  8. Superhauler

    Superhauler TEACHER OF MEN

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    no you can move the 5th wheel any where on the back of frame (unbolting it) its not against the law.
     
  9. Sportster2000

    Sportster2000 Road Train Member

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    So I moved the the 5th wheel back 5.75 inches. Put all of the weight back on the trailer and scaled it. 11,720 on the steers, 31,500 on the drives, and 33,500 on the trailer tandems. 76,720 gross and everything works out.

    The truck is a freightliner cascadia with a longer wheelbase. Freightliner speced the truck with a 12,000 pound front end, they then put a cummins in it. My company bought it thinking that they were getting a good deal. I would have never bought the truck myself as I just spent 4 days messing with getting it to scale out. The new cummins engines need to go on a diet as they weigh a little more than the other engines out there.
     
  10. NTMD8OR

    NTMD8OR Light Load Member

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    I wonder how much fuel is in it and how far forward the fuel tanks are on the frame?
     
  11. Sportster2000

    Sportster2000 Road Train Member

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    The fuel tanks are full and the fuel tanks are just to the right or back of the drivers and passenger doors. My guess is that they are 140 gallons apeice.
     
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