Views: 10 Author: Site Editor Publish Time: 2025-07-01 Origin: Site
Trailer leaf springs play a vital role in absorbing road shocks and maintaining suspension stability. But over time, factors like weather exposure, corrosion, and heavy loads can degrade them. Replacing your trailer’s leaf springs isn't just about swapping old with new—you need the right specifications to ensure safety, performance, and compatibility.
Here’s a complete guide on when and how to replace your leaf springs, including tips on measurements, tools, and choosing the correct spring type for your trailer.
Inspect your leaf springs regularly—at least every 12,000 miles or whenever you notice signs like:
Visible cracks near the eye ends or mounting plates
Rust, corrosion, or pitting on the surface
Sagging or uneven trailer stance
Gaps between spring leaves, indicating wear or overload
Preventive maintenance goes a long way. Wipe down your springs periodically, remove dirt and buildup, and lubricate the assembly to extend lifespan.
Getting accurate measurements is essential when ordering replacement springs. Follow these steps:
Lift the trailer: Use a jack to elevate the trailer until the axle hangs freely. Ensure the jack is not placed on the suspension itself.
Remove the spring: Always measure with the spring unloaded. Remove one side at a time for stability.
Length measurement: Use a standard tape to measure from the center of one eye to the other (eye-to-eye distance).
Width measurement: Measure from the bottom of the lowest leaf to the top of the top leaf.
A/B measurements: Measure from the center bolt (center point) to each eye—label these as A and B.
Spring arch: Flip the spring upside down and measure from the floor to the highest point. This helps you understand its current wear level.
To select the correct leaf spring replacement, consider these factors:
Axle Capacity: Usually listed on a sticker or in the owner’s manual.
Number of Leaves: More leaves offer stronger support but less flexibility.
Spring Type: Trailer leaf springs come in different designs:\n - Double eye springs
Slipper springs with radius, hook, or flat ends
Mono-leaf or multi-leaf (with clips between each layer)
Always replace leaf springs in pairs to ensure balanced support and prevent uneven wear.
Sometimes, if the spring body is in good shape, you may only need to replace the bushings.
The tools required can vary depending on the spring condition. If heavily rusted, you might need more aggressive removal tools. Recommended tools include:
Torque wrench and socket set
Jack, jack stands, and wheel blocks
New U-bolts and hardware
Rust penetrant and sealant
Breaker/pry bar and wire grinder
Safety gear: gloves, mask, and safety glasses
Use new U-bolts even if other hardware looks reusable.
Torque to spec: Always refer to manufacturer recommendations for tightening torque.
Treat rust: Clean and coat the trailer underside with anti-rust protection before installing the new springs.
Apply thread locker on new bolts to reduce loosening over time.
Check alignment and balance the trailer after replacement.
With over 20 years of manufacturing expertise, Wondee Leaf Springs are engineered for durability, precision, and global standards.
Annual capacity: 35,000 tons
12 production lines, including automated cutting, quenching, and assembly
Material options: SUP9, SUP11A, 60Si2Mn, 51CrV4, 55Cr3, and more
Available sizes: Thickness from 6 mm to 59 mm, width from 44.5 mm to 140 mm
Certified: ISO/TS16949 and GB/T 19844-2005 compliance
Whether you're replacing springs on a travel trailer, commercial semi-trailer, or agricultural vehicle, Wondee offers proven solutions trusted by OEMs and fleets worldwide.
