Spring Hanger Spacing Dimensions for a Tandem Axle Slipper Spring Suspension on a 14,0000 lb Trailer

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Question:

i would like to know the hanger spacing on 7 ton slip spring instalation thanks

asked by: Todd

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Expert Reply:

The hanger spacing for a tandem axle trailer suspension setup can be determined, but you need to take into account the axle spacing needed for the overall diameter of your wheel and tire combination and the springs you will be using.

Lets say that you plan on using 4 of the 5-Leaf Slipper Springs, # e74SR, for 7,000-lb Trailer Axles, and that your wheel and tire combinations are the Karrier ST235/85R16 Wheel and Tire, # AM32764.

The AM32764 wheel and tires overall diameter is 31.61 inches, so you will need your axles to be centered at least 33-1/2 inches apart and you might be better off going with 36 inches apart, so there is clearance for the suspension to work and the tires do not contact each other at the center between the axles.

Hanger spacing is also dependent on the center equalizer used in the slipper spring setup. The longer the center equalizer, the wider the axle spacing will be, causing a wider hanger spacing.

To get 33-1/2 inch axle centers, for two 7,000 lb axles using the 5-Leaf Slipper Springs, # e74SR, and the Tandem Axle Hanger Kit, # AP202-H202, the hanger spacing would be 28-3/4 inches between the front and center spring hangers and 28-3/4 inches between the center and rear spring hangers. This hanger kit uses # 13-4 equalizers.

To get 36 inch axle centers, for two 7,000 lb axles using the 5-Leaf Slipper Springs, # e74SR, and the Tandem Axle Hanger Kit, # AP216-H202, the hanger spacing would be 30-1/2 inches between the front and center spring hangers and 30-1/2 inches between the center and rear spring hangers. This hanger kit uses # 13-44 equalizers.

The equalizer you referenced, # 13-118-03, is for newer 8,000 and 9,000 lb axles. We carry it as a replacement part and it is not used in any of our hanger kits. If you were to use this equalizer with spring hangers designed for 2 inch slipper springs, you would need to mock up your suspension and determine the hanger spacing you will need. You will also need to make sure there would be clearance between the axle centers for your suspension to move with the wheels and tires you are using.

expert reply by: Robert G

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Answer 1

Yes, you can use the Pintle Hook Mount, #63059, in either a rise or drop position. If you need a bolt on pintle hook, use #C48205. It has a 10,000 pound capacity so it has more than enough capacity for your trailer.

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Answer 2

The spring hanger placement is going to be determined by your axle spacing. For example, if your axles are spaced 33 inches apart, as shown in the attached diagram, a 7K axle slipper spring, like #e74SR, requires a distance of 28-1/2 inches between…

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Answer 3

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 4

There isn't a specific distance the hangers have to be for hanger kit #AP216-H238. A good place to start is 30-1/2 inches on center but you would only really know by mocking it up on the trailer before permanently installing the hangers. To…

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Answer 5

The two options you're referring to, the Dexter Trailer Axle w/ Electric Brakes #7685269-EB and Trailer Axle w/ Electric Brakes #e52SR are essentially the same when it comes to their specs. The only difference is the manufacturer with one being…

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Answer 6

The only reason that I can see that those tabs would have been welded onto your frame is to restrict articulation of the equalizer. And the only reason I would see anyone putting those on is if the articulation was causing the tires to contact the…

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Answer 7

The Equalizer from the Tandem-Axle Trailer Equalizer Kit for 2" Slipper Springs #AP216 is available without the hardware. The Equalizer for 2" Wide Slipper Springs #TREQ1344 is what you are looking for.

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Answer 8

The equalizer in the Tandem-Axle Trailer Equalizer Kit #AP216 is 11-1/2" on center from the outer spring mounting holes when measuring horizontal separation. One hole will be 6" on center from the equalizer mounting hole center and the…

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Answer 9

If you have 2 inch wide 7k slipper springs like the part #e74SR and your current axles are 38 inches apart on center the hanger kit part #HAP-105-205-01 that you referenced would be what you'd need.

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Answer 10

To upgrade to an EZ lube setup will require you to replace your axle or you could just replace the spindle. For a spindle with a 4 bolt mounting plate you would want the part #TRU74FR as it is an ez lube spindle. For a new hub/drum to fit this you…

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Answer 11

The hanger spacing is going to depend on a few things including the spring measurements and the equalizers being used. But if you were using spring #e67SR the distance between the hangers would be around 29-3/4 inches. However this is using hanger…

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Answer 12

I would use a protractor, see photo, place the protractor on the edge of the inside of one side of the trailer frame and the other inside edge of the trailer frame should be parallel with the 50 degree line on the protractor. Another way to verify…

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Spring Hanger Spacing Dimensions for a Tandem Axle Slipper Spring Suspension on a 14,0000 lb Trailer

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