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Truck terminology

Discussion in 'Questions From New Drivers' started by Duncan Rider, May 31, 2016.

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  1. May 31, 2016 #1
    Duncan Rider

    Duncan Rider Bobtail Member

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    First when reading about truck tractor features, what does the number 265" or maybe 300" stand for and why Is this important?.
     
    Duncan Rider, May 31, 2016
    Duncan Rider, May 31, 2016
    #1
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  3. May 31, 2016 #2
    77fib77

    77fib77 Road Train Member

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    I assume you are referring to wheel base length. It is how long the tractor is. Longer usually means better ride. And harder to park.
     
    Last edited: May 31, 2016
    Reason for edit: Spelling
    77fib77, May 31, 2016
    77fib77, May 31, 2016
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  4. May 31, 2016 #3
    STexan

    STexan Road Train Member

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    Generally the longer the wheelbase, the wider the turning radius assuming identical wheel cut. Also longer wheelbases are generally associated with "smoother ride", more curb weight, and at a further cost of being more difficult maneuver in tight spaces.

    mv-wd_Cat12_Dimensions.jpg
     
    STexan, May 31, 2016
    STexan, May 31, 2016
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  5. May 31, 2016 #4
    Duncan Rider

    Duncan Rider Bobtail Member

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    Like from the front axle to the rear axle?
     
    Duncan Rider, May 31, 2016
    Duncan Rider, May 31, 2016
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  7. May 31, 2016 #5
    77fib77

    77fib77 Road Train Member

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    Front to middle of the two axles of tractor.
     
    77fib77, May 31, 2016
    77fib77, May 31, 2016
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  8. May 31, 2016 #6
    Duncan Rider

    Duncan Rider Bobtail Member

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    Thanks Stexan for the illustration. So it appears to be the length between the steer axle and a point between the two drive axles.
     
    Duncan Rider, May 31, 2016
    Duncan Rider, May 31, 2016
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  9. May 31, 2016 #7
    MACK E-6

    MACK E-6 Moderator Staff Member

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    That is the wheelbase of the tractor.


    More distance between axles gives the suspension on the given axles more time to finish it's movement after a bump in the road. This is what tends to give a smoother ride.

    But as noted previously, this comes at a cost of maneuverability and a hogher empty weight due to more frame rail.
     
    MACK E-6, May 31, 2016
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  10. May 31, 2016 #8
    Duncan Rider

    Duncan Rider Bobtail Member

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    Thanks 77fib77 for your help. One more question to do with sleepers. When a tractor has a 72" sleeper. What dimension are they referring to?
     
    Duncan Rider, May 31, 2016
    Duncan Rider, May 31, 2016
    #8
  11. May 31, 2016 #9
    okiedokie

    okiedokie Road Train Member

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    Longer wheelbases/axles also can carry more weight in certain states. Bridge weights.
     
    okiedokie, May 31, 2016
    okiedokie, May 31, 2016
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  12. May 31, 2016 #10
    77fib77

    77fib77 Road Train Member

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    Measure from the back of the seat to the back wall of the sleeper.
     
    77fib77, May 31, 2016
    77fib77, May 31, 2016
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