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Tandem steer axles are primarily employed in vehicles because of that particular vehicle's load distribution, per-axle weight limits and bridge formula issues. They're often used for crane applications, large cement mixers, dump trucks, and for some oversize load hauling applications, etc. -- vehicles where a single steer axle would be inadequate or undesirable. Single axle load limits are typically 20K pounds, tandem load limits are typically 34K lbs. How both the payload weight is distributed and how the axles are distributed can have a substantial effect of how much weight a particular axle has to carry, and to remain legal additional axles are required -- however just putting extra axles around the rear drive axles will do little to ease a heavy forward located load. Also, with tandem steer axles the tires are actively turned, unlike tag axles which tend to passively turn/align themselves (or not turn at all). By having a couple active steer axles one can gain a more positive steering response (not to be misinterpreted as meaning a tighter turn) which can be particularly useful in off-road applications, and by having the forward (steering) axles actively aligned in turns rather than having an extra forward placed axle just passively tagging along (sorry, had to) less tire scrubbing should result.
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What drive axle pulls constant on a semi truck?
Most semi tractors with three axles are a 6x4 configuration, also referred to as 'twin screw'. On these, power is transmitted from the engine to a power divider, which is basically a differential. The power divider has outputs going to both drive axles, and supplies power to both drive axles constantly. Many drivers think a power divider lock engages one of the axles, but this is incorrect - power in constantly provided to both axles, and the PDL simply locks the outputs to rotate at the same speed to both axles (when unlocked, the power divider can account for differences in tire height at each axle). Some three axle tractors have only one live axle, but this is a bit rare in North America. In Europe, where 4x2 was the norm, and you could put 40,000 lbs. on the single drive axle, some have added an additional lift axle to reduce damage to roadways, but this axle is not powered.
What is a truck drivers grab?
On semi tractors and some 4x4's it is just a bar to grab to help get into the cab.
Why tractors used in farms has large rear and small front wheels?
Some farm tractors that have small wheels in the front and larger wheels in the back is to help farmers pull larger equipment. The large tires have more traction and the smaller wheels help to steer.
What is the difference between a 6by4 tractor unit and a6by2 tractor unit?
A 6x4 tractor has three axles (one steer axle and two drive axles). In normal operations, only one drive axle is engaged, but the second axle can be engaged as well using a differential lock. 6x2 tractors are more common in Europe, Asia, Northern Africa, etc. They will have a steer axle, and a single drive axle. They will also have an additional axle next to the drive axle, which cannot be engaged to drive the vehicle. Often, this will be a lifting 'tag' axle, which in Europe would usually have one tire on either side, while some of Schneider National's Freightliner Argosy tractors in the US and Canada have a lifting rear axle with two tires per side to allow the same weight rating as if it were a drive axle.
How many axles are there on a car?
4-wheeled cars have 4 axles. Depending on the type of drive-train that the car uses, some of the axles might only be stub axles or hubs, and some axles might be referred to as 'spindles', but they are all, 'axles', nonetheless.
How many wheels does a semi trailer have?
Most semi trailers have 8 wheels, some have 12. The tractors almost all have 10 wheels but some of them have 14.
Does a semi have 4 wheel drive?
No, semi-trucks are rear drive only. However, technically because the rear wheels typically have two axles you could make an argument that 4 sets of tires are driving the vehicle. And if those rear wheels are duallies, which they usually are, it would actually be 8 wheel drive. :) There are some semi tractors which have a transfer case and a live front axle... these are typically highly specialized units for niche role work, and you won't see them in use for hauling freight and general commodities. Specialized sitework and oilfield vehicles, as well as the military M916 tractor, are such examples.
What are multi axle trucks?
A multi axle truck, refers in most occurrences, to a type of trailer that is being pulled behind a semi. In some instances a semi may be pulling one trailer behind it and other times it may be pulling two trailers. On each trailer there are two axles which attach to the tires. So if you see a sign that says $.50/axle and a semi truck is pulling a trailer, he will have to pay two dollars. One dollar for his own semi truck which has two axles and another dollar for the trailer that he is hauling.
Which farm tractors are the most versitile?
Some versatile farm tractors include New Holland Tractors. They serve multiple purposes.
What are some of the kinds of Case IH tractors that one might purchase?
Some kinds of Case IH tractors that an individual could purchase are Axial-Flow, Farmall, Steiger, and Magnum tractors. All of these tractors come with a warranty.
What math do truck drivers use?
Addition, subtraction, division, multiplication. A couple examples:Since I don't have a Qualcomm on my truck, I have to manually record my mileage at each state line for fuel tax purposes. Let's say I leave State A, drive through State B, and enter State C. At State B, I write down the last four digits of my odometer (let's say it's 3426), and I do the same at State C (we'll say it's 3871). When I do my recap and fuel tax report, I'll subtract my mileage at the state line for State B from my mileage at the state line for State C to get a count of how many miles I ran through State B (in this case, it would be 445 miles).Some customers have a scale on-site, which only gives out gross weights - it won't give a weight reading by each set of axles. So you axle out. First, you put your steer axle on the scale. Let's say it reads 11,500 lbs. Then you pull forward to where both your steer and drive axles are on the scale. Let's say it reads 42,650. Then, you pull forward to where all axles are on the scale. Let's say, it gives a gross weight of 72,500. You subtract the weight you got when you just had the steer axle on the scale (11,500) from the weight you got when you had the steer and drive axles on the scale (42,650). It comes out to 31,150, meaning you have 31,150 lbs. on your drive axles. Then you take your gross weight reading (72,500) and subtract the reading you got with the steer and drive axles from that (42,650) to get your trailer axle weights. In this case, it would be 29,850 lbs. on the trailer, and, if you have sliding tandem axles, it means you can move the trailer axles forward about two holes to give a smoother ride.
Where can I purchase some good used tractors for my farm?
There are several online stores that sell used tractors. Local tractor supply stores should also have some good used tractors.
