Trailer Coupler Repair Kit Instructions


Towing a trailer is a large responsibility because an accident while towing magnifies the consequences. One way to avoid an accident is to ensure your trailer's systems are fully operational. A key systems area is the connection between the trailer and the vehicle's hitch. These are locked together with a coupler fastened to the trailer's tongue. Occasionally a coupler needs repairing due to rust or corrosion. You can change the internal components of the coupler with a few common tools.

Things You'll Need

  • Socket set
  • Socket wrench
  • Coupler repair kit
  • Remove the broken coupler's handle and underjaw by loosening the nut located inside the ball mount with a socket and socket wrench. Remove the handle, spring and underjaw.

  • Inspect the coupler for damaged metal. If it appears twisted, rusted or cracked, you need to replace the whole coupler.

  • Place the repair kit's new handle and bolt through the hole in the top of the coupler.

  • Slide the coil spring, underjaw, tension spring and nut onto the bolt, from the bottom, in the order listed.

  • Tighten the bolt slightly with a socket and socket wrench.

  • Lower the coupler onto a hitch with the correct-size ball. The ball size is listed on top of the coupler.

  • Lower the latch to lock the coupler onto the ball. Tighten the bolt that secures the handle until the locking jaw is snug against the ball.

Tips & Warnings

  • After towing 50 miles, double-check the fit between the ball and the underjaw. Make adjustments as necessary.


  • Photo Credit Thomas Northcut/Photodisc/Getty Images
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