How To Determine Axle Spacing On Tandem Axle Dump Trailer Using 30-1/4" Leaf Springs

Question

Question:

I’ve got a tandem axel dump trailer That is ready for the axels to be set. If my leaf springs are 30.25” from eye to eye how do I determine the overall length from center of axel to center of axel. Also have 8” equalizer

asked by: Joseph

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Expert Reply:

I would be happy to help you figure out the axle spacing when installing your axles on your dump trailer.

Since you are using a 30-1/4" double eye spring we do not have an exact axle spacing measurement as that is quite a bit longer than the springs we typically use so you will need to mock up the hangers and axles and see what works for that length spring.

Your hanger spacing will likely be around 34" which would give you an axle spacing of around 39". The most important thing is that you have at least 2" between the front and rear tire. You will also want to make sure that your axle placement allows 10% tongue weight of the trailer.

I included a link to a few helpful articles on axle placement and double eye trailer suspension for you to take a look at.

expert reply by: Samuel C

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Answer 1

With the equalizer that comes included with the Tandem-Axle Trailer Hanger Kit for Double Eye Springs #APT5 measuring 7-3/4 inches long (from eye to eye) and your leaf springs measuring 23 inches long, you will want to mount the front and rear…

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Answer 2

Thank you for the measurements you provided and for the photo of your trailer suspension mockup showing the spring components' spacing. As long as your shackles do not hit the trailer frame (you mention 1/8-inch clearance) you should be fine, but…

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Answer 3

I've attached an article to help you with axle placement based on tongue weight. There is some math you will need to do for your specific trailer to find either the single axle location or the location of the center hanger in your case for a…

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Answer 4

The difference in the measurements is because the centers of the springs (and axles) are closer to one hanger than the other because of the equalizer and shackle straps. The spread between the axles is therefore a little more. If the spring eyes…

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Answer 5

You bring up a great question. I attached the picture of the worksheet that you referenced as well. What works best is to first setup the center line for the center hanger so that 60 percent of the length of the trailer is in front of the center…

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Answer 6

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 7

Thank you for providing the specs for the suspension components that you already have. Correct hanger spacing really depends on the components being used such as springs, hangers and equalizers. Most of the hanger spacing dimensions that we have are…

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Answer 8

To find the load capacity for your axle you should look on the trailer VIN plate or sticker that lists the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that…

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Answer 9

Hey Richard, thanks for reaching out! The Dexter DX7.5 Drop-N-Go Brake Actuator #099-175-00 is a great option for a replacement actuator because it's a direct replacement for the common Model 60 actuators that were popular in the '90s.…

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Answer 10

Well shackle length is mainly based on the height difference between the front and rear hangers. The rear hanger normally doesn't hang as low as the front so that the shackle can offset the difference and add the ability to move. What is the…

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Answer 11

To determine the size of the brake assemblies you need you have to measure the depth and width of the hub drum on the axle like what you see in the picture I attached. The most common size is 2-1/4 inch wide like the #T4071600-500 that you…

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Answer 12

For a single axle trailer, you want the shackle strap to be able to move so that you have the spring deflection needed for your suspension. Angled like the photo or even almost vertical is fine you just don't want the shackle strap to bind and…

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How To Determine Axle Spacing On Tandem Axle Dump Trailer Using 30-1/4" Leaf Springs

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