Here we call it a pusher axle if it's in front of the drives, or a tag axle if it's behind the drives.

Or, you can call it a lift axle no matter where it's located.

Here a triaxle (a tandem axle truck with one lift axle) can legally gross 65,000 lbs.

A quad axle (tandem axle truck with two lift axles) can legally gross 73,000 lbs.

 

So how does the scale man know the weight rating of the front axle when you drive through?

 

Or you can call them a pony axle.

I have no idea how they calculate it Gator but the scalemaster's for my quarries say that I can haul up to 12 tons with my little dump truck. Problem is that the truck can't actually take that much, it can take 11 tons but the bed is entirely filled with no more room for any additional rock. DOT says I can't run more than 8 tons without being overweight on my rear axle. They popped me for being over on my drive when I only had 8 and 1/4 on me. I normally run 10 at a time.

 

we call them lift axles.

By thw way i once had a guy ask me if that is where the spare tire was mounted. :?

 

It doesn't. On another note, In Indiana, a tri-axle can haul 68,000 legally. Even if I'm at 67,000, I'll still be overweight on the drives because the load can't be scaled out properly. My company allows us to run up to 73,000 and they pay all the overweight fees.
One time I go pulled over by DOT, out came the scales :roll: . The officer was only putting the scales on my drives, so as I rolled the truck over them, I added more air to my tag axle which took weight off of my drives. I was at 71,500, but the weight on my drives was legal :wink: . The officer decided that the scales at the quarry must be wrong :lol: