The same way you would on a road tractor. If it has an automatic transmission (the Allison six speed is quite popular), it does it for you. If it has a manual transmission, it will be unsynchronised, and you will either have to double clutch or float the gears - let the RPMs run up to 1100 - 1200, drop it out of gear, when the RPMs drop to 700, pop it into the next gear up. After doing it for a while, you get to a point where you pay little to no attention to your tachometer, because you'll be able to do it by the sound of the motor alone.
96 inches for the cab, and the dump body can be up to 102 inches wide.
20.000 - ~25,000, depending on specifics.
Depends. 17 tons, give or take, is typical.
They're usually between 11 - 12 feet tall at their tallest point.
That's going to depend on what transmission you have. In most cases, they shift in a similar fashion to any other Class 8 truck with an unsynchronised transmission. But some have other transmission types.
That depends on what your transmission is. If you don't know how to shift an unsynchronised transmission, you need to have someone teach you, hands-on. You're not going to get it simply by reading about it.
Concrete is measured in yards, not tons. As for permissible tonnage on a dump truck, it'll vary by state. IIRC, in North Carolina, a tri-axle dump is typically good for 16 - 18 tons, dependent on tare weight, wheelbase, and whether they're traveling on primary or secondary roads.
It is highly doubtful that a turtle would be of sufficient size to reach either the gears or pedals on a dump truck. A turtle would not be able to gain the necessary qualifications to be permitted a licence.
That depends on the dimension of the dump body. The dump body could hold 15 - 20 cubic yards of material, typically. As for what can legally be hauled, it depends on the commodity and weight of the commodity per cubic yard, as well as state laws pertaining to what weight limits they allow for a tri-axle.
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The amount of dirt a dump truck can hold depends on the size of the dump truck. The average tri axle dump truck can hold 12 cubic yards of dirt, and a quad axle can hold 14.
A dump truck with two drive axles.