Optimal end dump pulling truck

RockinChair · Jan 15, 2017

Unchained said: ↑

700 HP 6NZ Cat, spinning a 2250 torque 18 speed, pushing super 40 rears with 3:25 with full lockers does real nice and will get you 6.3 mpg average... Just my 2 cents... View attachment 163893
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Sounds like that truck is a dream to drive.

blade · Feb 19, 2017

Pedigreed Bulldog said: ↑

Problem with that set-up that many people don't realize is that you cannot legally gross 80,000 pounds with the spread on a trailer that short unless you can put enough weight on your steers to make up for what you can't put on your drives and trailer axles. Federal bridge formula has an exception to allow 34/34 on the drives and trailer tandems IF axles 2-5 are at least 36'. A spread is a pair of single axles, NOT a tandem, and therefore axles 2-5 are limited to a lower weight per the federal bridge formula. You've got to have 39' between axles 2 & 5 before you can have 68K on those axles without the exception, and a 39 or 40' trailer just isn't going to get you there.

"Exception to formula

There is one exception to the use of the formula and table: two consecutive sets of tandem axles may carry a gross load of 34,000 pounds each—providing the overall distance between the first and last axles of such consecutive sets of tandem axles is 36 feet or more. For example, a 5-axle tractor-semi trailer may be used to haul a full 34,000 pounds on the tandem of the tractor (axles 2 and 3) and the tandem of the trailer (axles 4 and 5), providing there is a spacing of 36 or more feet between axles 2 and 5. A spacing of 36 feet or more for axles 2 through 5 is satisfactory for an actual W of 68,000 pounds even though the formulaor table computes W maximum to be 66,000 to 67,500 pounds for spacings of 36 to 38 feet. This special exception is stated in the Federal law."
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Since that is a custom built truck maybe he speced it lite enough to haul 25tons!! But since he customized that truck to go pull a end dump I would hope he's able to keep it busy legal only counts if you get caught just saying

abyliks · Feb 19, 2017

blade said: ↑

Since that is a custom built truck maybe he speced it lite enough to haul 25tons!! But since he customized that truck to go pull a end dump I would hope he's able to keep it busy legal only counts if you get caught just saying
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Not that I condone (or personally.....) run overweight, but you get very good at knowing where all the "coffee stops" are around the scales while pulling a dump or a walker

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