How To Measure For Replacement Overhead Springs On A Trailer Door

Published 01/27/2022

Question:

Can you help me figure out how to calculate spring size needed on a trailer door that has springs overhead

asked by: Kristofer M

Expert Reply:

In order to measure the size of spring # CB250D96SHD your trailer ramp door needs, you'll want to take these measurements:

Measure the springing weight, you can do this by taking down the weight of the ramp at the beginning of the spring cycle. This can be done by weighing the trailer door by placing a scale underneath the door with the spring assembly not attached.

Next, you'll want to measure the distance from the top of the door to the end of the open door. This is a safety precaution to ensure the cable will not disconnect from the drum.

Then, you'll want to measure the height of the trailer from the ground to the door hinge.

Continuing, measure the offset from the outside of the rear trailer frame, inside to the center of the spring system tube. You'll only need this if the spring mounting bracket is custom.

Next, measure the height of the hinge to the center of the spring system tube.

Finally, measure the door width of the ramp door.

With all that information in hand, you'll have everything needed to select a new overhead spring for your trailer.