Semi tractor spec help - The Combine Forum
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post #1 of 35 (permalink) Old 03-08-2019, 09:25 PM Thread Starter
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Semi tractor spec help

I am looking at a used truck with a 13,200lb front axle and 46,000lb rears, 18sp with 3.91 ratio. 560hp. 3/8” frame thickness. 230” wheelbase with 58” sleeper. Setback front axle. There is still 7-8’ clearance behind the sleeper to the fifth wheel.
Truck was spec’d for 100% highway tanker hauling.
Can anyone advise if the 13k front axle will be ok for farm use and gravel roads? Frame thickness ok?
I would like to do some contract hauling (grain and flat deck) in the off season so want a decent truck. I know this will be nice on the highway.
My truck experience is with a heavy twinsteer tridrive picker so I have no reference for tractor units.

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post #2 of 35 (permalink) Old 03-08-2019, 09:46 PM
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Most trucks have a 12k front. So 13k is no problem.

I’d take that spec of truck anyday on the farm and not be afraid to pull super B with it.

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post #3 of 35 (permalink) Old 03-08-2019, 10:05 PM
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That truck will be heavy with 13k front axle and 3/8 frame. Depending on engine weight I’m guessing your pushing 10k tractor weight. Most custom haulers want at truck at 8900-9100kg if possible
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post #4 of 35 (permalink) Old 03-08-2019, 11:07 PM Thread Starter
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The build spec sheet shows Estimated Truck Weight at 8701kg. I assume that is dry weight. But add the 250 Gal of fuel (1500lbs) and rigging and will be over 10k for sure.

Line item says:
10-3/4” steel rails to 354”
3/8” rail thickness

Not really sure what that means.

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post #5 of 35 (permalink) Old 03-09-2019, 12:25 AM
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Lets just say, that's alot if truck!

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post #6 of 35 (permalink) Old 03-09-2019, 12:34 AM
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354" is the length of frame, 10-3/4" is the frame rail height and it's all 3/8 of an inch thick.

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post #7 of 35 (permalink) Old 03-09-2019, 01:17 AM
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I could easily be off on this but whatever observations of trucks I've looked at and noted the frame thickness, the 5/16 frame had the 40 rears and not to say 3/8 frames and 40's are not mated up but I've got three trucks here of various vintages with 44/46 rears and all have 3/8 frames and walking around Ritchie Bros looking at the heavier spec trucks made to actually handle/pull a load, they have 3/8 frames. Again could be off on my thinking as its not as if I've seen line order sheets to see the combinations but I have an inkling that 46 diffs are going to come with a 3/8 frame simply because the frame and diff size is there for a reason. I have seen a friends truck that has the 5/16 frame and how that particular air suspension sits under the frame, its rolled the lower rail of the frame some from the stress, the frame just couldn't handle what a farm situation and our lovely roads can dish out.

Gear ratio wise, I see a lot of 3.91 spec'ed trucks in later years and comments about newer engines being able to run slower, its about getting better fuel mileage for sure vs what had been and probably still is also the popular 4.10 spec for Super B use. Does this truck have the 11R-24.5 then all the way around and also on the steer or do they have slightly larger steer tires.

Can't really comment on the wheel base with the set back and the sleeper size and what that would look like if lets say you wanted to put a headache rack on for hanging chains and boomers ( for running a flat deck ), just something to think about and measure for and know that this unit can be rigged up like that and still give you the room you need for turning. I am only guessing that due to the set back axle you probably wouldn't have to slide the plate very far ahead of center to get max weight on the steer axle.

To me it sounds like a good unit on paper, then again I don't custom haul and am not so worried about packing a bit extra weight penalty that gives me a tougher truck vs a unit that is light as a feather and asking possibly too much of it.
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post #8 of 35 (permalink) Old 03-09-2019, 09:00 AM Thread Starter
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I was looking for a 244” WB but shopping used limits you.
For hauling hay here you are allowed 2m forward projection from the kingpin, so 6.5’. You won’t get 3 full size bales on the bottom row of an 11’ neck deck but should be able to get that extra forward bale on the top row with a proper rack built.
Cummins X15 scares me a bit.
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post #9 of 35 (permalink) Old 03-09-2019, 09:09 AM
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What year model is the truck on average I try to stay older than a 2007
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post #10 of 35 (permalink) Old 03-09-2019, 09:29 AM Thread Starter
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2018 model year

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