Please tell me you're not an owner/op who doesn't know this.
Your manufacturer's GVW is going to be the combined weight ratings of the tandem and steer axles. If you have 40k rears and an 18k steer, you have a manufacturer's GVW of 58k - your pushers are aftermarket, and are not counted in the manufacturer's GVW.
As for legal GVW, that depends on bridge law formula, and what your state's disposition is on primary and secondary roads. The last dump truck I drove was a tandem axle T800. I could gross 54k on secondary roads, but only 51.5k on the Interstate.
The 2006 Mack Granite CV713 has a gross weight of 62,000 pounds. The front axle weight is 18,000 pounds and the rear axle weight is 44,000 pounds.
The same as it would be for any other three axle straight truck - 54,000 lbs, legally. What the actual capacity of the truck is depends on the frame construction, and the axle weight rating (an on road vehicle might have a 12,000 steer axle, and 40,000 lb tandems, whereas a dump truck would have heavier duty axles).
22,000 - 25,000 lbs or so.
Open the drivers door and look for an information sticker on the end of the door It will have the axle code for your truck
As much as it's legally rated for. You could be talking about a truck in any configuration... single axle, tandem, tri-axle, quad axle, quint axle, centipede, superdump, etc., or a tractor-trailer, then you get into various configurations there, including heavy haulers. You need to be a little more specific.
Both of them.
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.
There's no such thing as a one axle truck. There has to be a minimum of two axles. "Single axle" if a term referring to a truck with only a single drive axle, and doesn't count the steer axle. Same with "tandem axle", "tri axle", "quad axle", and "quint axle".
An image search for "Mack CH600" or "Mack CH613" should do the trick. Most line haul CH series trucks had the E7 engine, normally rated at either 427 or 460 horsepower. Those will have a decal on the lower part of the door which will say "E7 427", "E7 454", or "E7 460" - those with engines with lower ratings do not have this. Also, if you look on the Wikipedia page for Mack trucks, there's a photo of a green Mack RD688 quad axle dump truck, with the company logo, truck number, and license plate blacked out. I can tell you firsthand that truck has the 427 E7 in it, Eaton-Fuller 8LL transmission, and Mack axles with 4.17 rear end gears.
The axle of the truck broke.
You need to be more specific about the configuration. Is a single axle straight truck, a tandem axle straight truck, a tandem axle straight truck with additional lift axles, a tractor trailer...?
From the center of steer axle to center of rear axle on trailer. If you want just the truck it's the center of steer axle to center of rear drive axle.