Steep Downhill and you need to downshift

Discussion in 'Experienced Truckers' Advice' started by Lepton1, Apr 20, 2013.

  1. MysticTrucker

    MysticTrucker Light Load Member

    129
    49
    Jan 23, 2013
    Cottage Grove, MN
    0
    You wouldn't mind sharing that would you? I am guessing it would be not applicable across the board but it may give me a good starting point.
     
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Lepton1

    Lepton1 Road Train Member

    12,647
    25,589
    Nov 23, 2012
    Yukon, OK
    0
    Any cheat sheet will be specific to a given truck and will depend on the gear ratios and general "strength" of the drive train and jake brake. Other variables will be road and lighting conditions and especially the weight of the load (and how high the center of gravity of the load is for down grades that have corners).

    For down grades I'm familiar with, I've had a range of choices for selecting the ideal gear for being able to let the jake control the descent. If I'm heavy, then I need a lower gear, and if I'm light I'll take a higher gear.

    I want a gear that lets the jake control the descent with as little (or no) use of service brakes as possible. Best if I can just play with the 2-4-6 cylinder settings on the jake for controlling rpm's and speed.
     
  4. scottied67

    scottied67 Road Train Member

    10,826
    12,673
    Mar 14, 2010
    california norte
    0
    I was the lead truck going down a steep hill in Idaho or Montana, (can't remember the name of the pass) anyway this hill is 25 miles per hour recommended. About 7 trucks behind me but not one of them wanted to go around and pass me. I was in 5thLo full jakes and had to touch the gas every now and again because it kept wanted to lose speed below 25. Once we go out onto the flat all these trucks flew on by but the valley smelled like a brake barbeque. My guess was these guys were used to running down the hill a certain speed and I fouled them up or they simply were just overconfident with their trucks in the too high a gear for the hill.

    I've seen trucks on the side of the road full on fire from the brakes getting so hot they ignited the tires, then the wood flooring of the trailer. I've also seen a truck with smoking brakes on I5 southbound from Oregon going into California Agriculture check station, they shut that guy down til his brakes cooled off.

    If you see a brake check pull over area, make sure you pull over and at least flag the stop or show some few minutes on the elogs that you are checking the brakes because if they pull you in at the bottom of the hill they will want to know you checked. Going down hills is serious business, never let your guard down. Downshifting on the downhill is advanced technique, sorta like 'please don't try this at home' deal.
     
  5. droflex

    droflex Light Load Member

    210
    116
    Jan 30, 2013
    Centralia, WA
    0
    I'm not looking at it right now but I think this is what I wrote down:

    5% - 7L
    6% - 6H
    7% - 6L
    8% - 5H
    9% - 5L

    This is with a prostar on jake setting 3.

    From what I know, if the RPM is high the jakes work best (1500).

    Might be conservative but will get you down the hill with no drama.
     
    scottied67 Thanks this.
  6. Saddletramp1200

    Saddletramp1200 Road Train Member

    2,111
    2,836
    Sep 4, 2011
    Houston Texas,USA
    0
    Turn off the CB, and run the grade like YOU want. You can drop off a mountain 1000 times to slow, But just Once to fast.
     
    KeepitMovin47 and Ffx95 Thank this.
  7. Scania man

    Scania man Road Train Member

    2,199
    483
    Jul 1, 2011
    Saskatchewan
    0
    Great advice!!
     
  8. FozzyNOK

    FozzyNOK Road Train Member

    2,478
    3,820
    Jul 18, 2007
    Oklahomistan
    0
    I dont think that is Donner.. looks more like the gorge in NC.. especially with BIG FLASHING WARNING LIGHTS and tight turns.. Its been a long time since I've been over Donner but I do not remember their being really sharp turns and no flashing warning signs..
     
  9. CenutryClass

    CenutryClass Road Train Member

    1,539
    859
    Feb 15, 2006
    0
    that IS Donner..its between exit 139 and 136...midway between those two before you get to colfax
     
  10. FozzyNOK

    FozzyNOK Road Train Member

    2,478
    3,820
    Jul 18, 2007
    Oklahomistan
    0
    I wasn't sure really.. looked like the gorge.. I had a driver do the same exact thing right in front of me on day on the gorge.. he just refused to slow down.. local rock hauler.. sad really. I went 5 years driving north on I-5 up and down the Siskiyous with no jakes.. i was scared to death the first time I came down Donner... when I got down it I was like... "That was Donner?!?!"
     
    scottied67 Thanks this.
  11. allan5oh

    allan5oh Road Train Member

    1,557
    556
    Jan 6, 2010
    Winnipeg, mb
    0
    I've always done the two foot technique. Left foot on the brake keeping speed steady, right foot on the accelerator. That way your shift is faster and you don't gain speed.
     
    not4hire Thanks this.
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.