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a pusher axle is in front of the drive axles, a tag axle is behind them
It allows more weight to be carried. Bear in mind, it's only a pusher axle if it's located in front of the drive axle(s) - if it's behind, then it's a tag axle.
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 quad axle dump truck is a tandem axle dump truck, with additional lifting pusher and/or tag axles. The most common configuration is two steerable lift axles in front of the drive tandems, although some will have one pusher in front of the tandems, and a tag behind the tandems.
Trucks with air brake systems have them on the steer axles. Trucks with steerable pusher axles usually have those... non steerable pusher and tag axles (the difference between a pusher and a tag axle is that a pusher is located in front of the drive axles, and a tag axle is located behind) can go either way... they might have a single chamber 20 can or a dual chamber 30 can. Some trucks also only use dual chamber 30 cans on one drive axle, meaning only one axle has spring brakes... I see this often on the International Prostar, but have also encountered it on some Kenworth T2000s.
It varies by state in accordance with wheelbase, what type of axle and tires used (e.g., dual tires or 445 'super singles' on a 20k axle vs. a lesser rated steering pusher with 285s), whether it's on a primary or secondary road, etc.
Well, that depends... on what the commodity is, on what the bed dimensions are, and on whether or not you're concerned about weight. How much a tri-axle can hold weight-wise varies by state, and also by what type of axle and wheels is on the pusher. 16 to 20 yards should be about in the right range, though.
A quad axle dump truck is a tandem axle dump truck, with additional lifting pusher and/or tag axles. The most common configuration is two steerable lift axles in front of the drive tandems, although some will have one pusher in front of the tandems, and a tag behind the tandems.
Depends on what exactly it is.. twin steer, tandem axle truck with pusher axles, etc. For a tandem with two pusher axles, 18 - 21 tons, dependent on location, local laws, wheelbase, road type, etc.
A truck with three rear axles and one of the axles is a drop axle that is only used when carrying heavy loads.
A tri-axle has two live axles and a lift axle.. if it's located in front of the drive axles, it's known as a pusher... if it's located behind the drive axles, it's known as a tag axle. With a tandem axle setup (which is what tri-axles, quad axles, etc. are, albeit with the addition of dead axles), the driveshaft runs from the transmission output to the power divider. The power divider is a differential which transmits power evenly to both live axles.
"Super 10" is a transmission type. How much product it can carry will depend on the configuration... tandem, tri-axle, quad axle, quint axle, "centipede", "superdump", etc. When I worked at Pioneer Sand, we had one T800 "Superdump" (three pusher axles and a strong arm). It could carry 25 tons legally.