First off, 80k is easy. Been there, done that, never an issue.
I'm specing out a new truck with a lift axle and a quad axle trailer for 105,500 gross. Since you guys always have an opinion and a good knowledge base, I'd like another set of eyes on my math and axle spacing.
I'm based in Oregon and their bridge weights are the lowest in the Pacific NW but I also am wanting to keep my off track to 5.5 (for Idaho blue routes). I've not driven a tractor with more than a 244" wb - and yes, I do fully understand the effect the extra tractor length has on ones turning radius.
So far, this is what I've got:
Tractor: 268" / Trailer: 53', 18" kp, 16' 6" spread
1 ------ 2 -- 3 -- 4 ------------------- 5 -- 6 -- 7 ---- 8
(8 Axles - Length: 69.83 ft.)
1 - 2: 13' 10"
2 - 3: 4' 3"
3 - 4: 4' 3"
4 - 5: 30' 9"
5 - 6: 5' 1"
6 - 7: 5' 1"
7 - 8: 6' 4"
From the Oregon tables (and online calculator), I get the following max weight distributions:
Axle / Wheelbase / Table 1 / Table 2
1 - 4 / 22' 04" / 56,500 / 56,500
1 - 8 / 69' 07" / 80,000 / 105,500
2 - 4 / 8' 06" / 42,500 / 42,500
2 - 8 / 55' 09" / 80,000 / 90,000
5 - 8 / 16' 06" / 53,500 / 53,500
This gives me at 15,500 on my steers while still having ~66k on the deck (by my calculations). Is this "normal" or should I be looking at a lower steer weight and stretching out another 24 - 36" (putting the tractor at 282 - 296" - which will kill the Idaho off track).
I know I can snug up the trailer in ID by adjusting the 5th wheel, but not enough, by my measuring, to keep the 5.5 off track and not take out the landing gear on the first good turn.
What am I missing or what can I change up to better distribute the weight - if at all - while maintaining my 5.5 Idaho off track?
Thanks!
Michael
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This isn't a term paper, but for quick access:
References:
https://www.oregontruckingonline.com/cf/MCAD/pubMetaEntry/ODPermits/weightAnalysis/
Weight Table 1 (up to 80k):
http://www.odot.state.or.us/forms/motcarr/od/8110.pdf
Weight Table 2 (over 80k):
http://www.odot.state.or.us/forms/motcarr/od/8111.pdf
Idaho off-track Calculator:
http://itd.idaho.gov/dmv/poe/offtrack.html
Oregon Bridge / Brick & Stick axle weights
Discussion in 'Flatbed Trucking Forum' started by glitterglue, Dec 8, 2015.
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Your lift axle will take weight off the steer. The rest of that nonsense is foreign to me
glitterglue Thanks this. -
I think you will still need to permit for overlength on blue with over 48' trailer.
My truck is factory NW spec- 13,200/13,200/40,000 @ 12-9/5-4/4-4(244"wb).glitterglue Thanks this. -
Here's a truck I drove from 05 to 08, then moved into a similarly spec'd 09. 244" wb with an "Idaho" spec trailer. It's maxed out at 5.5 off track the way it sits. I could bridge 104,500 everywhere but OR and that was pushing 13kon the steer axle with the lift down. OR had us cut back to 102000.
Where is most of your freight? Seems like you can be 5.5 but get hurt in OR, or stretch out for OR and hurt your offtrack.
There was a guy from Missoula that used to run a 300" wb Pete and his quad had 2 steerable lifts for the back 2 axles.
Another option is to stretch the truck out, get your 11ft spread on the lift, and pull a 48ft tri-axle. If you can do that and get your tare down around 30-31k you could still load 65k or so and not have to worry about ID offtrack.glitterglue Thanks this. -
What is this ID 5.5 off track?
Cat sdp, glitterglue and MJ1657 Thank this. -
Dominick253, lester, glitterglue and 2 others Thank this.
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I couldn't meet 5.5 with a standard wb KW. And CLOSED axles on a 53 step. I needed to move my 5th up to shorten the bridge between drives and tandems but it was bolted in place.
You also can't weight more then 12,300 on the steers i think it was said by the scale house. ( although, i've rolled in at 12,700 on just fueled tanks from ontario ). And Oregon Bridge weight is 2,500 pounds less then federal bridge weight.
Also, if you run a lift, be careful on your steer weight that it's not too light. Oregon won't stop you but they WILL call the cops for unsafe steer axle weight. ( I think 9500 lbs is what i was told )
I paid Oregon $300 for that information because i was legal for federal but not for oregon.
I would call idaho and see if they can give you bridge length for the 7 axles to meet that 5.5. And then call oregon to see what oregon bridge weight would be with that idaho bridge length.glitterglue Thanks this. -
Whatever your tires are rated for is what you can go on the steer. We would be 12900 to 13100 with our lift down. Our 7 axle bridge was short for offtrack and we'd max it out so we had to pack the weight up front to go 104500.
glitterglue Thanks this. -
@glitterglue If you're still in the process of specing everything out you should get ahold of Western. They used to give you a print out of all your measurements based on how you want your truck and trailer set up. You'd know your offtrack and OR bridge before you buy the equipment.
Dominick253 and glitterglue Thank this. -
mountaingote and glitterglue Thank this.
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glitterglue and Dominick253 Thank this.
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