Review Questions - Click On The Picture To Begin...
In the following picture, what are axles 2 and 3 commonly referred to as?
- "tandems" or "front trailer tandems"
- "drives" or "trailer drives"
- "drives" or "drive axles"
- "duals" or "tractor set"
Quote From The CDL Manual:
#2 and #3 together are your tractor drive tandem axles (commonly referred to as "drives" or "drive axles")
TruckingTruth's Advice:
You'll normally hear drivers refer to these two axles as your "drives". They'll say, "The other day I scaled out and my 'drives' were over by 800 pounds".
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Which of the following techniques will not change the weight distribution across your axles?
- Sliding your trailer tandems forward or backward
- Raising the center of gravity height of the load
- Adding or burning off fuel
- Changing the weight distribution of the cargo along the length of the trailer
Quote From The CDL Manual:
There are several ways to distribute or redistributing the overall weight of the vehicle across the different sets of axles. You will affect weight distribution by:
- Changing the weight distribution of the cargo along the length of the trailer, or moving the cargo around after the truck has been loaded. This will distribute the weight mainly between your drive axles and trailer tandems
- Sliding your trailer tandems forward or backward will redistribute the weight mainly between your drive axles and trailer tandems
- Sliding your 5th wheel will redistribute the weight mainly between your steer axle and your drive axles
- Adding or burning off fuel will mainly change the amount of weight on your steer axle and somewhat on your drive axles also, depending upon the placement of your fuel tanks.
TruckingTruth's Advice:
If you move the center of gravity either toward the front or rear of the trailer, it will change the weight distribution across the axles. But raising or lowering the center of gravity of the load will not change its weight distribution across the axles.
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Sliding your trailer tandems forward or backward will redistribute the weight mainly between which two sets of axles?
- Drive axles and trailer tandems
- None of these answers are correct
- Steer axle and trailer tandems
- Steer axle and drive axles
Quote From The CDL Manual:
Sliding your trailer tandems forward or backward will redistribute the weight mainly between your drive axles and trailer tandems
TruckingTruth's Advice:
You may find a slight change in the weight of your steer axle after sliding your tandems, but it won't be very much and it's rarely much of a concern.
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You have steer tires rated at 6,150 pounds each, and you're in the state of West Virginia which says the legal limit for the steer axle is 20,000 pounds. What's the maximum legal weight you can carry on your steer axle in West Virginia?
- 12,000 pounds
- 12,300 pounds
- 20,000 pounds
- 34,000 pounds
Quote From The CDL Manual:
When distributing weight across a set of axles, you will ultimately be limited by the most restrictive law for any given situation. For instance, if the law states that you can carry 20,000 pounds on your steer axle, but your steer tires have a load rating of 6000 pounds each, then you can only carry a total of 12,000 pounds on your steer axle
TruckingTruth's Advice:
Your steer tires are rated at 6,150 pounds and you have two of them on your steer axle. Therefore you can carry a total of 12,300 pounds (6,150 x 2) on your steer axle. Because you can not legally exceed the load rating of your tires, the fact that West Virginia allows 20,000 pounds on the steer axle doesn't matter. You're ultimately limited by the most restrictive law, which in this case is related to exceeding the steer tire load rating.
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Adding or burning off fuel will mainly change the amount of weight on which axles?
- Steer axle and somewhat on your drive axles
- Drive axles only
- Drive axles and somewhat on your trailer tandems
- Trailer tandems only
Quote From The CDL Manual:
Adding or burning off fuel will mainly change the amount of weight on your steer axle and somewhat on your drive axles
TruckingTruth's Advice:
Most of the weight of the fuel will go on your steer axle. The percentage of weight distributed between your steer and drive axles with regard to fuel will depend on the placement of your fuel tanks.
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What is the main factor that will limit how far back you can slide your tandems?
- The maximum legal length allowed between your trailer kingpin and your trailer tandems
- The distance between your steer axle and drive axles or "tractor length rating"
- The overall height to length ratio of the cargo in the trailer
- The load rating of your drive tires
Quote From The CDL Manual:
The maximum legal length allowed between your trailer kingpin and your trailer tandems will limit how far back you can slide your tandems
TruckingTruth's Advice:
Different states have different laws regarding the maximum length allowed from your kingpin to your trailer tandems and you can look up these values in the Rand McNally Motor Carrier's Atlas
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Sliding your 5th wheel will redistribute the weight mainly between which two sets of axles?
- Trailer tandems and rear axles
- Steer axle and drive axles
- Drive axles and trailer tandems
- Steer axle and trailer tandems
Quote From The CDL Manual:
Sliding your 5th wheel will redistribute the weight mainly between your steer axle and your drive axles
TruckingTruth's Advice:
Sliding the 5th wheel will generally have little or no effect on the weight of your trailer tandems
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In the following picture, what are axles 4 and 5 commonly referred to as?
- "tandems" or "trailer tandems"
- "trailer drives" or "back tandems"
- "back set" or "rear tandems"
- "trailer set" or "back tandems"
Quote From The CDL Manual:
#4 and #5 together are your trailer tandem axles (commonly referred to as "tandems" or "trailer tandems")
TruckingTruth's Advice:
You'll generally hear drivers refer to these axles as simply "tandems". They'll say "The load I had yesterday was loaded incorrectly and I was overweight on my 'tandems' ".
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