Double clutching described by Missouri: Is it accurate?

Discussion in 'Questions From New Drivers' started by Dreamboat, Aug 23, 2015.

  1. Dreamboat

    Dreamboat Light Load Member

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    I am concerned ONLY with a driving test for CDL. No one told me about step 3--as thought it is a separate thing to do IN BETWEEN. And why would I be slowing down to the RPM required when I am shifting up??? Are the UP and DOWN RPMs reversed?

    The following is right out of the 2015 manual, page 2-9 (except I numbered my lists).

    Basic Method for Shifting Up.
    Most heavy vehicles with manual transmissions require double clutching to change gears. This is the basic method:
    1. Release accelerator, push in clutch and shift to neutral at the same time.
    2. Release clutch.
    3. Let engine and gears slow down to the rpm required for the next gear (this takes practice).
    4. Push in clutch and shift to the higher gear at the same time.
    5. Release clutch and press accelerator at the same time.
    Shifting gears using double clutching requires practice. If you remain too long in neutral, you may have difficulty putting the vehicle into the next gear. If so, don't try to force it. Return to neutral, release clutch, increase engine speed to match road speed, and try again.

    Knowing When to Shift Up. There are two ways of knowing when to shift:

    Use Engine Speed (rpm). Study the driver's manual for your vehicle and learn the operating rpm range. Watch your tachometer, and shift up when your engine reaches the top of the range. (Some newer vehicles use "progressive" shifting: the rpm at which you shift becomes higher as you move up in the gears. Find out what's right for the vehicle you will operate.)

    Use Road Speed (mph). Learn what speeds each gear is good for. Then, by using the speedometer, you'll know when to shift up. With either method, you may learn to use engine sounds to know when to shift.

    Basic Procedures for Shifting Down
    1. Release accelerator, push in clutch, and shift to neutral at the same time.
    2. Release clutch.
    3. Press accelerator, increase engine and gear speed to the rpm required in the lower gear.
    4. Push in clutch and shift to lower gear at the same time.
    5. Release clutch and press accelerator at the same time.
     
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  3. S M D

    S M D Road Train Member

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    Sounds about right. Only thing I can a suggest is not to shove your foot to the floor. Just push the pedal 1/4 way or so. After a couple hundred tries it'll become easier.

    I learned to float gears first then I learned how to double clutch. I learned to use my eyes and mind to focuse on the speedo and timing the gear change. Then after all that was down I started practicing double clutch which was fairly easy.
     
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  4. pattyj

    pattyj Road Train Member

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    That's way too much thinken for me,lol.I'm in second I double clutch as im shifting to 3rd so on and so forth.Once you get your own trk or even in trainers trk and get comfortable driving it,double clutching will come easy because you know your trk.
     
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  5. lots of character

    lots of character Road Train Member

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    Just round all those pesky parts off, eventually it won't grind anymore.
     
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  6. Dreamboat

    Dreamboat Light Load Member

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    Yeah. I've got double clutching; just not very smooth at it--not many chances to practice. Thing is that third step and the words "let engine..." as though I am waiting for something to happen there...

    I have my test tomorrow and am reviewing the manual.
    Floating has to wait until AFTER the test.
     
  7. pattyj

    pattyj Road Train Member

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    By law schools have to train double clutching but once you get good at shifting you'll probably float the gears meaning you won't need the clutch but to start, slow down, and stop.
     
  8. pattyj

    pattyj Road Train Member

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    Good luck tomorrow,the thing is don't overthink it and don't focus on the manual too much.Just focus on the test.You got this, just relax.
     
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  9. lots of character

    lots of character Road Train Member

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    I don't even use it then anymore. Except dead stops and starts.

    I've got an 8LL in my truck, just float down to low then lo-lo on the split
     
  10. pattyj

    pattyj Road Train Member

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    I drove for a company the trks were so slow and so uncomfortable all I did was float.I hated coming to stop signs and going up hills,took forever to gain speed.
     
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  11. pattyj

    pattyj Road Train Member

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    Its also important you match your rpm's with the motor.You have rpms too high trk wont shift,too low trk will die.
     
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