An 18 wheeler consists of a tractor (meaning something that pulls) and a trailer (meaning something that follows.) A semi tractor-trailer rig has a trailer that sits on top of the frame of the tractor on a coupling device called a "fifth wheel." The tractor has ten wheels with two on the front axle and four on each drive axle in the rear. The trailer has two axles with 4 wheels each. The tractor and trailer together are informally called a rig. Is that what you were after?
Repossessed tractor trailers can be purchased from some tractor trailer dealers. If the rig was previously financed by a bank, the bank repossessing it will try to sell the tractor trailer to a dealer before selling it to the public.
Could be anywhere from 55 to 80 feet, depending on the length of the power unit.
To get a job as a rig welder you should have some training in welding. You should also have some knowledge of repair and maintenance of a tractor trailer.
A converter gear or dolly is a coupling device of one or two axles and a fifth wheel by which a semi-trailer can be coupled to the rear of a tractor-trailer combination forming a double bottom rig.
Depends on the type and size of the rig, but a typical tractor weighs 15,000# and a 53' enclosed van trailer weighs about 13,000#, for a total of 28,000 lbs. Most US highways have an 80,000 pound weight limit, so the load capacity or maximum net weight of a typical tractor-trailer is 52,000 lbs.
Well there are no 55 foot trailers. The standard now days are the 53 foot trailers. Some companies have experimented with 57 foot trailers but they could ot be taken east of the Mississippi when I was driving. The total length varies depending on the rig that is pulling the trailer. The combination I believe is usally around 65-70 feet, could be a little less or a little more depending on the rig. Having recently conducted a study in California in hopes of changing the length law in this state, I measured 67 tractor trailer combinations. 57 of those combinations had measurements that fell between 73-75 feet. All combinations were made up of a conventioal tractor and a single 53 foot trailer. Hope this helps you.
Tractor trailers weigh from anywhere from 15,000lbs-20,000lbs, with tractor about 15,000lbs-20,000lbs. So about 30,000lbs-40,000lbs unloaded. They can carry about 40,000lbs 50,000lbs. They cannot be over weight on any axle, which cannot be under 12,000lbs on steers, rear axles 34,000lbs, and on trailer axles, also have to be 34,000lbs. It can be under but not over. The max weight loaded is 80,000lbs Gross Weight. If weight is over the max on the axles or gross, the DOT can give a ticket up to $1 a pound. If the trailer has a ten foot spread axle, up to 40,000 lbs. is permitted on the trailer axles, although the federal gross weight still may not exceed 80,000 lbs.
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The rims weigh about 60 lbs or more each. It depends on the manufacturer.
GVW means Gross Vehicle Weight. That's the maximum permissible weight of the truck plus the trailer (in the case of a combination rig) plus the load. Therefore...if you take your dump truck, hook a 20,000-lb empty trailer to it and put a 25,000-lb backhoe on the trailer, the truck needs to weigh less than 25,000 lbs if you want to remain legal.