The question is far too vague to answer. We don't know the make and model of the dump truck, we don't know if you're referring to an actual button or a knob of the type used in the air brake system of an older vehicle, whether it's OEM or aftermarket, etc.
It's a dump truck with four axles--the steer axle in front and three axles in back. One of them moves up and down via a control in the cab, so the tires aren't on the road if the truck's not loaded. A tri-axle dump truck carries more weight than a one-axle or two-axle truck.
That's going to depend on the dump truck's configuration. It could be a single axle, tandem, tri-axle, quad axle, quint axle, centipede, frameless end dump, framed end dump, etc.
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 quint axle dump truck is larger than a quad axle dump truck. The quint axle configuration includes five axles, which allows for a higher payload capacity and increased stability compared to a quad axle truck, which has four axles. This additional axle in quint axle trucks helps distribute weight more effectively, making them suitable for heavier loads.
Tandem axle dump truck. In some states, you may be able to put up to 15 tons on a single axle with an additional lifting tag axle.
What type and configuration of dump truck? A single axle dump truck is going to be much shorter than a centipede, and you could be referring to any dump truck in between the two extremes, as well.
What type and configuration of dump truck? A single axle dump truck is going to be much shorter than a centipede, and you could be referring to any dump truck in between the two extremes, as well.
It looks like a dump truck that has another axle in front of the tandems at the rear of the vehicle. Most people who have these trucks have a mechanism to allow the fourth axle to be raised when it's not needed.
A North American truck will be 96" wide.
4289321 cubic inches
Centre of the front axle to the centre of the rear axle.
A dump truck with two (tandem) rear pulling axles supported by a third fixed axle located in the middle of the truck which only reaches the ground after a certain amount of load weight.