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solismaris's avatar
solismaris
Explorer
Apr 16, 2019

Broken leaf springs - third time!

My 2005 Prowler trailer has just had its third case of broken leaf springs. The first occured just 2 years after purchase, and the second 5 years after that. That set lasted a while longer: 7 years; maybe because I took it to a specialty shop and had them put on "extra heavy duty" springs".

Not good enough. Why do they keep breaking? I inspected the damage: The leaf just broke in half close to where it attaches to the frame. The metal doesn't appear to be corroded badly: surface rust but the inside metal looks shiny.

The design seems strange: Though there are several layers of leaves through the center (4 I think) it diminishes to a single leaf at the attachment. That seems like a weak spot. And indeed that's where the break occurred all three times. Is that a normal design?

I'd love to find a fix for this. I know it's an old trailer but is 2-7 years really the longest I can expect before a failure? This is the worst kind of breakdown because it comes without warning and can cause major problems if it happens far from home. Amazingly, the last failure happened 100 feet from my driveway! So all I lost was 4 days camping reservations :(

Trailer GVW is 8000 pounds and I do not have it heavily loaded with gear or supplies.
  • 9 posters and at least 9 broken springs, and to think that some say it is not a common occurrence. Just Google broken trailer springs and select images if want to see the junk. The OP needs to select a different supplier and hope somehow that the springs might be better.
  • Had a 1995 Terry trailer. Within about 5 years time i had springs break twice. It was a small 17 ft tandem axel and not overloaded. One broke coming out of the woods slowly from an elk hunting trip.
    A couple years later we were driving down the highway in the middle of the desert. Smooth highway and another one broke.
    This time i had all four replaced with one size heavier rating.
    Current trailer has the torflex suspension so no more broken springs.
  • Are the leaf springs mounted 'Under' the axle tube OR 'Over' the axle tube?

    Leaf spring breaking....same axle/same location?
    OR are others on different axles breaking?

    Have you checked 'alignment'?

    Is a 'center equalizer' flipped.....look same as other?


    Do you routinely have to 'jack' trailer to park it?
  • Possibly overloaded. May need to step up to the next larger capacity spring. Have you ever weighed your trailer ?
  • Not normal, even if China steel springs.
    Weird outside possibility, but the equalizer between the front and rear springs isn’t “flipped” over center causing the trailer to ride on one axle effectively?
  • Maybe reducing the amount of the spring's flex/movement would help by installing shocks. Use the tire's sidewall max. psi to also reduce vertical movement (but should run the max anyway).

    Not sure if it would help much, if it all, but perhaps install better spring bushings like a wet bolt kit? Stock plastic bushings fail pdq and would allow slop in the spring movement.
  • Common design and a common problem. The break usually occurs where the end of the second spring meets the main ply causing a stress point. Some custom shops will make full length springs for the second ply. I replaced mine with springs from a farm supply place that uses Redneck Trailers as their distributor and so far, so good.

    I blame much of the problem on the cheap imported steel. Look at the springs regularly and if you see a change like space between the ply ends, where there was none from new, replace.
  • That is odd. Sounds to me like a normal spring design. Usually when leaf springs break it’s because of some combination of over loaded and hit a curb/pothole/log in the Forest. Rust does diminish capacity, so perhaps they just rusted a bit too much? Either that or you gotta quit taking it rock climbing.

    Seriously, springs breaking is not common. Something weird is going on. I hope you figure it out soon.