Down hill jake braking, what speed and gear do you use?

Discussion in 'Questions From New Drivers' started by Trukie, Aug 6, 2022.

  1. Trukie

    Trukie Bobtail Member

    26
    10
    Dec 4, 2020
    0
    Say you are 77k gross
    You see 6% grade for 4 miles sign
    55 max truck speed

    What speed do you try to maintain downhill? What gear?
     
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

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

  3. beastr123

    beastr123 Road Train Member

    2,272
    19,653
    Jan 2, 2014
    Moose Jaw SK CAN
    0
    45 to 50 mph
    gear to maintain engine rpm at 1850
     
  4. aussiejosh

    aussiejosh Road Train Member

    4,295
    4,419
    Aug 28, 2009
    Airlie Beach QLd
    0
    Some signs say trucks must use low gear but don't really understand what that really means, their understanding is provided I change down a couple of gears, that means I'm in low gear, however low gear means a gear that will hold your truck down a steep incline without the use of the truck brakes, which would be about 3 rd gear, the idea behind this is to prevent the driver from cooking the brakes if that happens you'll have no brakes and be unable to control your vehicle. If however its not such a steep incline as 6 % is not that bad and the engine retarder will hold your truck back then It'd be fine I guess the other question still remains though what if your retarder, engine brake failed what then? which leads us back to putting the truck in a gear that will hold it without any other source.
     
  5. Concorde

    Concorde Road Train Member

    1,490
    3,412
    Jun 29, 2016
    West Melbourne Florida
    0
    Disclaimer; All depends on weather / traffic of course.

    For me it’s 55mph, 16th gear and 3rd stage on Jake..if I’m slowing down too much I go to 2nd stage then back to 3rd.

    Most important is to watch your rpm”s..that is key to not destroying your engine.
     
  6. Antinomian

    Antinomian Road Train Member

    1,695
    2,442
    Feb 17, 2013
    0
    That's completely dependent on your truck, gear ratio, and engine. What you should be shooting for is to not have to use your brakes, or to have to use them very little. Choose the gear that holds you back to a constant or near constant speed with the jake on. As long as it's a safe speed for the road and you aren't speeding or running over anybody then that's it.
     
    loudtom, alds, usamerica and 4 others Thank this.
  7. Trukie

    Trukie Bobtail Member

    26
    10
    Dec 4, 2020
    0
    Detroit 12.7
    18
    3.73
    I was going about 50-55, 7 low, 1900rpm the truck felt like it kept gaining speed i had to use the brakes alot to keep it from jumping 2k rpm, like the jakes werent holding maybe? Maybe i was too high a gear. I dont know
    This was Tennessee - north carolina the last hill downhill southbound thats 6%.
    Its been 2 weeks since i had the overhead done
     
  8. Old Man

    Old Man Road Train Member

    4,511
    13,005
    Apr 3, 2009
    Oklahoma City, OK
    0
    Drop another gear. You can go down too slow any time, but maybe go down to fast once.
    Your not driving the family car.
     
  9. Trukie

    Trukie Bobtail Member

    26
    10
    Dec 4, 2020
    0
    I'll do that, first time on the hills with this truck
     
  10. Tumbleweed TowMan

    Tumbleweed TowMan Light Load Member

    209
    947
    Jun 22, 2022
    0
    Question from a light-class operator.

    If you side on safety, and start in a gear lower than actually needed, is it an issue to go up a gear, or does that present an issue of possibly missing the proper gear and causing chaos?
     
  11. Tumbleweed TowMan

    Tumbleweed TowMan Light Load Member

    209
    947
    Jun 22, 2022
    0
    Never be faster at the top than ya wanna be at the bottom!
     
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

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

  • Draft saved Draft deleted