increased
When you're loaded to the point where your weight will exceed your legal weight as a tandem truck. Honestly, you should probably have it lowered any time you're loaded, since a motor carrier officer who sees a tri axle, quad axle, etc. with a raised lift axle is likely to question it... even if you are legal, it's time wasted and another annoyance to deal with. If you mean when after you get loaded, you do it while the vehicle is not in motion - don't lower your lift axle while the vehicle is moving.
It's a trick question - gross weight is the loaded weight. The weight of an empty vehicle would be the tare weight. This would depend on exactly what model International it was, as well as the configuration (single axle, tandem, tri-axle, etc).
The axle on the driver side of the vehicle.
It allows the vehicle to carry more weight.
is this in a gm vehicle? if it is , it is not the pinion shaft that needs to be lowered.it is a square block , held in place with one bolt, inside the diff housing. this block holds end of axles apart. when this block is removed, you can then push axle shafts towards centre of vehicle to remove c-clip that prevents axle from sliding out of diff and axle housing. any good shop manuel will have a picture of this
in semifloating axle vehicle carriers all weight of axle where as in fully floating vehicle does not carry any weight on vehicle.
The rear axle is a "live-axle", one solid axle connecting to the differential in the middle of the vehicle.
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The function of a lift axle is to increase a heavy vehicle's weight capacity. For example, if a vehicle will be crossing a weight restricted bridge, the lift axle will be lowered to distribute the weight of the cargo to the other wheels. There are two general categories of lift axles - pushers, and tag axles. Tag axles are located behind the drive axle(s), whereas pushers are located in front of the drive axle(s). Tag axles are beneficial additionally in that they increase a vehicle's wheelbase, and thus give that vehicle a higher weight allotment. The downside is that they're often not steerable, and they can also cause the drive axle(s) to become something of a fulcrum, increasing the weight applied to the steer axle. As for how they're actually operated, most of them are pneumatic... when air is supplied to them, the air pushes against the springs which keep them suspended and push them to the ground. In the case of cement mixers, the Bridge Master arm they have on the back is hydraulically operated.
In a full-floating axle, the axle bearing is placed on the outside of the axle housing. This places all the vehicle weight on the axle housing and none on the axle itself. This is important for the front axle which is generally a short shaft. In the semi-floating axle, the axle bearing is placed in the axle housing and the axle carries some of the load of the vehicle. The main advantage of the semi-floating is that it is simpler (i.e. cheaper). Courtesey of: http://www.m38a1.ca/axles.html Sourced by: Paul Henderson, Donegal, Ireland.
That's talking about a vehicle, not an axle. A 6x2 vehicle has six wheel assemblies, and two are driven. So you'd be looking at three axles total (two wheel assemblies per axle), one of which would be a live axle with a differential, and the other two would be dead axles which are not driven... there'd be a steer axle, and the other dead axle could be a stationary axle, or it could be a lift axle. The powered axle could be either the forward or rear drive axle - it doesn't have to be one or the other.
It's pretty cut-and-dry.. it's an axle which can be raised and lowered. Normal five axle units don't have them - they tend to be exclusive to heavy haulers. You see them on a lot of straight trucks, as well, such as dump trucks.