Driving down steep grades in icy conditions

Discussion in 'Questions From New Drivers' started by Lepton1, Sep 21, 2017.

  1. Lepton1

    Lepton1 Road Train Member

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    I always have the Interaxle Differential Lock engaged in slick conditions. A good practice drill for anyone new to the concept is find a wide open icy parking lot and practice bobtail with and without the IAD (power divider) engaged. Try getting going in 4th in low rpm's and then romp on the throttle. Without the power divider engaged you will likely yaw to the left. Engage it and try that again.

    Some trucks are different than others. Some become very stable with the power divider engaged. Others are "less stable".

    Try that exercise again with and without the IAD engaged winding it up to 1800 rpm's in 4th and then get off the throttle in high Jake. Learn the limitations and reactions of your tractor using the IAD and the Jakes. Then try it again with an empty trailer. Practice until you have the feel of it. The wrong time to START practice is descending westbound from the Eisenhower Tunnel in a local blizzard with no chains on.
     
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  3. AModelCat

    AModelCat Road Train Member

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    Good habit. My dad taught me that one. Running those big tridrives off road you pretty much need the power dividers locked in all the time. 1 wheel lifts off the ground or loses all traction and you're stuck.
     
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  4. Lepton1

    Lepton1 Road Train Member

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    Oh yes! I have had the privilege of driving a tri drive once. Lock 'em up and use the throttle to steer uphill and brakes to steer down hill.
     
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  5. Sho Nuff

    Sho Nuff Road Train Member

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    Just watch Ice Road Truckers.....and disregard the suspense music. They never fall through the ice :D

    RIP Darrell Ward.
     
  6. pattyj

    pattyj Road Train Member

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    So what does he do if there's an oncoming vehicle?That road only looked wide enough for one vehicle.
     
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  7. AModelCat

    AModelCat Road Train Member

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    Probably use radios. All the bush roads back home were single lane with wide spots every couple kilometers. VHF radios were mandatory and you had to call out your kilometer marker as you passed it. Trucks going up had to yield right of way to trucks coming down.
     
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  8. Toomanybikes

    Toomanybikes Road Train Member

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    Control is provided through traction, friction in the road surface. You limit your braking through one or two axles by using the brake, your more more likely to give up all control.

    The same thing you do with the jakes you can do with the brakes, it just requires a little more effort and conscious control to use the peddle.

    Like I said, and how the driver in your video said, how you get by in slick conditions my be your business, but you do a dis-service to disregard the fact that most new drivers that find themselves on icy roads overestimate their ability and use of the jake.
     
  9. Lepton1

    Lepton1 Road Train Member

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    True all that. That's why I say that you must practice in a controlled environment before doing it "for real". Because new drivers are drilled with the mantra of "never use Jakes in slick conditions" they either never practice or simply park if a snowflake might be in the air. The truth is that every driver will be faced with a situation, sooner or later, when they will need to descend a long downgrade when conditions are slick. It's best to prepare for that with practice. If you haven't practiced then hopefully you remember this thread and the video in the OP. Use low or medium Jake setting and light brake pressure.
     
  10. uncleal13

    uncleal13 Road Train Member

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    Looks just like normal road conditions to me. Part of life in the Great White North.
    Freezing rain polished by the wind, now that's slippery.
     
  11. Accidental Trucker

    Accidental Trucker Road Train Member

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    I actually LIKE using the jake in slick conditions. Once the jake shuts off (engine RPM goes to naught when the wheels lose traction), you still have 8 MORE brakes to apply and slow you down. Apply minimum power, straighten out, flip Jakes off, apply brakes, reduce speed several gears, try again.

    When going down on service brakes, if you were to lose traction, you have NO more brakes to apply. No margin. EEK!

    I like having lots of margin. A tractor losing traction is something that happens dozens of times a year in our operation, and is no big deal. We get to practice getting in and out of some of the places we load and unload just to get in there. Modulate power, straighten out, apply brakes, reduce speed, try again.

    Not using Jakes would scare the bejeebers out of me.
     
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