How to Install Boat Trailer Leaf Springs

If your boat trailer frequently bottoms out, the trailer’s leaf springs may be due for replacement. Over time, the leaf springs may loose their ductility from repeatedly absorbing the up and down motion from your boat’s weight. The springs may also rust from fresh- or saltwater corrosion, compounding the wear and tear. Upgrade your leaf springs to improve your trailer’s handling, smooth bumpy travel and minimize damage to your boat.

1. • 1
     
     Lower the trailer’s tongue jack stand to stabilize the front end. Jack the rear of the trailer, placing a jack stand under the side on which you’ll be working. Place blocks under the front of the trailer for additional support. Place a jack under the rear axle to remove weight from the leaf spring.
   • 2
     
     Remove the U-bolts and retainer bracket that hold the center of the leaf spring to the axle. With the jack supporting the axle, remove the spring bolts from the shackle forks that hold either end of the leaf spring in place. Remove the old leaf spring.
   • 3
     
     Install the new leaf spring in the reverse order that you removed the old one. Fasten the front leaf spring end loosely to the shackle. Rotate the leaf spring up and under the axle. Seat the axle in the center of the leaf spring, and fasten the other end of the leaf spring loosely to the rear shackle fork.
   • 4
     
     Fasten the U-bolts and retainer bracket to the axle. Tighten the nuts in a crisscross pattern for a secure fit. Finish tightening the leaf spring ends to the shackle forks.
   • 5
     
     Tighten all the bolts to the manufacturer’s torque specifications, using a torque wrench.

 

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