Selecting Replacement Leaf Springs for Enclosed Trailer

Question

Question:

I am replacing work out springs on an enclosed trailer. I need 4000 pound springs and the existing spring hangers are 25 inches from the center of the bolt holes not accounting for the additional length from the shackles. What length spring would be the best choice for the replacement? Thanks.

asked by: Tommy S

0

Expert Reply:

Leaf springs stretch with use and age and to make sure you match their length, as well as their capacity, you will want to pull one out of the trailer's suspension so you can measure its eye-to-eye length. A well-used spring can stretch as much as 1/2-inch from its original length.

If your hanger hole spacing is 25-inches on center then you may well need a 25-1/4-inch like # e57SR but the length of your shackles comes into play too. The spring eye dimension should be longer than your hanger hole spacing, as shown on the linked image.

It is also a good idea to confirm on the axle's sticker what its weight rating is. Then click on that capacity on the linked page for leaf springs and choose the appropriate length based on your original spring.

expert reply by: Adam R

0

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Answer 1

When you replace leaf springs on a trailer you want to match the capacity as well as the length. Since your 2021 Wolfpack 365PACK16 has 7k axles you want 7k leaf springs (3,500 lbs per spring). You can also use your spring eye to spring eye…

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Answer 2

Good question, and what happens is that leaf springs elongate over time, and since you mentioned you got measurements of 25-1/2 inches from center eye to center eye and 26 inches under partial load, the best option for leaf springs really is the…

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Answer 3

Sometimes it is possible to install leaf springs that have more leaves but depending on what you already have installed you may only be able to add taller hangers like the 3-1/4" tall #28-5. If you can give me some more information on how many…

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Answer 4

It is normal for a round axle to have somewhat of a bow pointing up in the center such as the Dexter Trailer Axle Beam with EZ-Lube Spindles part #T3584F-EZ-8974 so that it can flatten out under a load. However if you trailer axle is bent somewhere…

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Answer 5

Assuming your tires are in good shape without any bulges the easiest way to determine if you have a bent spindle is to take a straight edge that is longer than the tire and lay it across the tire parallel with your trailer frame and then measure the…

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Answer 6

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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Answer 7

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 8

Hey Jaime, yes you can replace your 25-1/4 inch 3,500 lb axle leaf springs with a 5k rated axle spring like the part #e44SR. This will increase the suspension's weight capacity and might make the ride quality a little rougher but it would fit and…

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Answer 9

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 10

To correctly measure a leaf spring, you'll want to jack the trailer up on jack stands so the axle is hanging freely, then measure directly across from the center of one spring eye to the other, as shown in the provided diagram. The height of the…

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Answer 11

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 12

To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. If the old assembly has L44649 inner bearings, you would use the hub you chose #8-258-5UC1. If the inner bearings are marked…

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Selecting Replacement Leaf Springs for Enclosed Trailer

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