Review Questions - Click On The Picture To Begin...
You receive a scale ticket and your drive axles are 31,700 and your trailer tandems are 35,100. Based upon a trailer with 6 inch slider rail hole spacings, what is the minimum number of holes you would have to slide the tandems to get the weight legal, and what would the final weights be?
- Slide tandems back 4 holes - 33,300 tandems - 33,100 drives
- Slide tandems forward 4 holes - 33,300 tandems - 33,100 drives
- Slide tandems forward 3 holes - 33,900 tandems - 32,900 drives
- Slide tandems back 3 holes - 33,900 tandems - 32,900 drives
Quote From The CDL Manual:
The two main hole spacings you'll find are 4 inches and 6 inches. You can estimate that you will move 250 pounds per hole for 4 inch spacing, and 400 pounds per hole for 6 inch spacing.
TruckingTruth's Advice:
With 35,100 pounds on the trailer tandems you must move a minimum of 1,100 pounds off the trailer tandems. To shift weight off the trailer tandems and onto the drive axles, you slide the trailer tandems back toward the rear of the truck.
With 6 inch spacing you're moving 400 pounds per hole so you need to move 3 holes to shift a minimum of 1,100 pounds (400 x 3 = 1,200).
With 6 inch spacing you're moving 400 pounds per hole so you need to move 3 holes to shift a minimum of 1,100 pounds (400 x 3 = 1,200).
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Sliding your trailer tandems toward the front or back of the vehicle will primarily change the weight distribution between which sets of axles?
- It only removes weight from the trailer tandems
- The tractor's drive axles and the steer axle
- The steer axle and the trailer tandems
- The tractor's drive axles and the trailer tandems.
Quote From The CDL Manual:
Sliding your trailer tandems toward the front or back of the vehicle will primarily change the weight distribution between the tractor's drive axles and the trailer tandems.
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What factor has the greatest affect on how much weight is moved per hole in the tandem slider rail?
- The center of gravity of the cargo
- The distance from the drive axles to the trailer tandems
- The distance between the locking pin holes
- The amount of fuel you have onboard
Quote From The CDL Manual:
The distance between the locking pin holes on the trailer will be the main factor affecting how much weight is moved per hole. This distance varies between the different trailer manufacturers, and the larger the distance between the holes, the more weight will be shifted with each hole.
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You receive a scale ticket and your drive axles are 35,400 and your trailer tandems are 31,100. Based upon the two most common tandem slider rail hole spacings, what is the minimum number of holes you would have to slide the tandems to get the weight legal, and in which direction?
- 6 inch spacing - slide tandems back 4 holes
4 inch spacing - slide tandems back 6 holes - 6 inch spacing - slide tandems forward 4 holes
4 inch spacing - slide tandems forward 6 holes - 6 inch spacing - slide tandems forward 5 holes
4 inch spacing - slide tandems forward 7 holes - 6 inch spacing - slide tandems back 5 holes
4 inch spacing - slide tandems back 7 holes
Quote From The CDL Manual:
The two main hole spacings you'll find are 4 inches and 6 inches. You can estimate that you will move 250 pounds per hole for 4 inch spacing, and 400 pounds per hole for 6 inch spacing.
TruckingTruth's Advice:
With 35,400 pounds on the drive axles you must move a minimum of 1,400 pounds off the drive axles. To shift weight off the drive axles and onto the trailer tandems, you slide the trailer tandems forward toward the front of the truck.
With 6 inch spacing you're moving 400 pounds per hole so you need to move 4 holes to shift a minimum of 1,400 pounds (400 x 4 = 1,600).
With 4 inch spacing you're moving 250 pounds per hole so you need to move 6 holes to shift a minimum of 1,400 pounds (250 x 6 = 1,500).
With 6 inch spacing you're moving 400 pounds per hole so you need to move 4 holes to shift a minimum of 1,400 pounds (400 x 4 = 1,600).
With 4 inch spacing you're moving 250 pounds per hole so you need to move 6 holes to shift a minimum of 1,400 pounds (250 x 6 = 1,500).
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Your trailer has a 6 inch hole spacing in the tandem slider rail and your trailer tandems are 900 pounds overweight. What is the minimum number of holes you will have to slide the tandems to get the tandems within legal limits?
- 4 holes
- 2 holes
- 3 holes
- 1 hole
Quote From The CDL Manual:
The two main hole spacings you'll find are 4 inches and 6 inches. You can estimate that you will move 250 pounds per hole for 4 inch spacing, and 400 pounds per hole for 6 inch spacing.
TruckingTruth's Advice:
6 inch hole spacing means you'll move approximately 400 pounds per hole. In order to move a minimum of 900 pounds, you have to move at least 3 holes (400 x 3 = 1200).
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What are the two most common tandem slider rail hole spacings, and roughly how much weight is transferred per hole?
- 6 inches apart - 250 pounds per hole
10 inches apart - 500 pounds per hole - 6 inches apart - 350 pounds per hole
8 inches apart - 550 pounds per hole - 4 inches apart - 250 pounds per hole
6 inches apart - 400 pounds per hole - 4 inches apart - 450 pounds per hole
6 inches apart - 200 pounds per hole
Quote From The CDL Manual:
The two main hole spacings you'll find are 4 inches and 6 inches. You can estimate that you will move 250 pounds per hole for 4 inch spacing, and 400 pounds per hole for 6 inch spacing.
TruckingTruth's Advice:
There will be some variance here, but generally speaking these are very good estimates and they work very well. You'll learn to recognize the spacing by glancing at them eventually, but in the beginning you might want to measure quick so you know how far to slide the tandems.
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You receive a scale ticket and your drive axles are 35,700 and your trailer tandems are 30,600. Based upon a trailer with 4 inch slider rail hole spacings, what is the minimum number of holes you would have to slide the tandems to get the weight legal, and what would the final weights be?
- Slide tandems back 7 holes - 33,750 drive axles - 32,550 trailer tandems
- Slide tandems back 6 holes - 33,950 drive axles - 32,350 trailer tandems
- Slide tandems forward 7 holes - 33,950 drive axles - 32,350 trailer tandems
- Slide tandems forward 6 holes - 33,750 drive axles - 32,550 trailer tandems
Quote From The CDL Manual:
The two main hole spacings you'll find are 4 inches and 6 inches. You can estimate that you will move 250 pounds per hole for 4 inch spacing, and 400 pounds per hole for 6 inch spacing.
TruckingTruth's Advice:
With 35,700 pounds on the drive axles you must move a minimum of 1,700 pounds off the drive axles. To shift weight off the drive axles and onto the trailer tandems, you slide the trailer tandems forward toward the front of the truck.
With 4 inch spacing you're moving 250 pounds per hole so you need to move 7 holes to shift a minimum of 1,700 pounds (250 x 7 = 1,750).
With 4 inch spacing you're moving 250 pounds per hole so you need to move 7 holes to shift a minimum of 1,700 pounds (250 x 7 = 1,750).
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You receive a scale ticket and your drive axles are 32,200 and your trailer tandems are 35,100. Based upon the two most common tandem slider rail hole spacings, what is the minimum number of holes you would have to slide the tandems to get the weight legal, and in which direction?
- 6 inch spacing - slide tandems forward 3 holes
4 inch spacing - slide tandems forward 5 holes - 6 inch spacing - slide tandems back 2 holes
4 inch spacing - slide tandems back 4 holes - 6 inch spacing - slide tandems back 3 holes
4 inch spacing - slide tandems back 5 holes - 6 inch spacing - slide tandems forward 2 holes
4 inch spacing - slide tandems forward 4 holes
Quote From The CDL Manual:
The two main hole spacings you'll find are 4 inches and 6 inches. You can estimate that you will move 250 pounds per hole for 4 inch spacing, and 400 pounds per hole for 6 inch spacing.
TruckingTruth's Advice:
With 35,100 pounds on the tandems you must move a minimum of 1,100 pounds off the trailer tandems. To shift weight off the trailer tandems and onto the drive axles, you slide the trailer tandems back toward the rear of the truck.
With 6 inch spacing you're moving 400 pounds per hole so you need to move 3 holes to shift a minimum of 1,100 pounds (400 x 3 = 1,200).
With 4 inch spacing you're moving 250 pounds per hole so you need to move 5 holes to shift a minimum of 1,100 pounds (250 x 5 = 1,250).
With 6 inch spacing you're moving 400 pounds per hole so you need to move 3 holes to shift a minimum of 1,100 pounds (400 x 3 = 1,200).
With 4 inch spacing you're moving 250 pounds per hole so you need to move 5 holes to shift a minimum of 1,100 pounds (250 x 5 = 1,250).
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What affect will sliding the trailer tandems forward have on the weight distribution?
- You will put more weight on the steer axle and take weight off the tractor's drive axles
- You will put more weight on the trailer tandems and take weight off the tractor's drive axles
- You will take weight off the tractor's drive axles and put more weight on the steer axle
- You will put less weight on the trailer tandems and put more weight on the tractor's drive axles
Quote From The CDL Manual:
By sliding the trailer tandems forward, you will put more weight on the trailer tandems and take weight off the tractor's drive axles.
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