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Mark |
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With the new job and new truck, I find I leave it on #3 all the time. I never have less than 19,890 pounds in the box, and the Jake doesn't seem to do anything at #2 or #1 except make useless noise. I don't really *need* a Jake where I'm running now, for that matter, but it reduces the number of times I have to break the cruise. |
Thanks for the info,....I was scared out of my seat when that thing came on inside the garage the first time. I was trying all the switches and buttons, and walla,....that obnoxious noise!!
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not true on the older trucks. the jake never quit. if you stopped the truck and put the parking brake on and then let out the clutch without turning the jake off, the truck would stall. it was real embarrassing when the boss was standing there |
I've been doing the same thing Steve has.......
On my Cummins ISX 450, the engine fan does increase the braking, and as far as using it or not, you might as well turn it on, because the engine temp can creep up 25 degrees on the hills anyway. I prefer going down 6% grades with my feet on the floor as well, that way I can use my brakes if I need them, to keep from crashing into the wrecked trucks at the bottom that operated otherwise. :) IMHO, use the technology you have. jonboy |
Yep Rev is just wrong on this one. Most of the engine fans on Superior Carriers trucks are programmed to come on after ten seconds of continuous jake brake use. I looked on Cummins website and it turns out Iron Eagle was almost dead on, an ISX fan uses about 60 HP at 2100 RPM. It is in the Every Mile section of their website about fuel mileage and efficiency. The fan can really be useful in getting the last little bit of slowing power on steep grades.
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All the Cat powered trucks I had the fan w/jake option deselected, I never saw the need for wearing out the fan clutch prematurely nor did I like the noise. |
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My CAT was made maximum rated horsepower at 2100 rpm and was governed at 2300. I haven't driven a ISX but the N14 was similar to the CAT. Any heavy diesel is designed to be able to run at 95% of rated power for long periods of time without doing any damage. I have never been able to get any truck to hold on steep (7% or more) grades on gear and jake alone in any gear when loaded to eighty thousand pounds. The fan is just a little added help and has been programmed to come on with full jakes on every computer controlled truck I have ever driven.
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