Bent Cutting Edge After a Curb Strike: Straighten, Weld or Replace? A Decision Tree

Scenario: a driver reports a hard curb hit and the end of the edge now sits crooked. Direct answer: do not decide anything until the plow is parked, blocked and inspected. Then work down the tree below. When a branch ends in “replace”, that is the safe default. This is shop judgment, not a manufacturer rule, so follow your plow maker’s repair guidance where it exists.

The decision tree

Work from the frame outward. Damage beyond the edge makes the remaining checks irrelevant.

1. Is the plow frame, moldboard or mount bent or cracked?
   • Yes → park the plow. Damage beyond the edge needs a proper repair or inspection before more work.
   • No → go to 2.
2. Is the edge cracked, chipped at the bolt holes or torn along its length?
   • Yes → replace. A cracked edge can break further under load.
   • No → go to 3.
3. Are the bolts bent, stretched or loose, or are the holes elongated?
   • Yes → replace the hardware, and replace the edge if the holes are damaged.
   • No → go to 4.
4. Is the edge only slightly bowed, with no cracks and a still-uniform contact line?
   • Yes → check it against a straightedge on the moldboard. If the gap is small and the edge seats flat once re-tightened, it may stay in service on a watch list.
   • No → go to 5.
5. Does the edge need heat or hammering to straighten?
   • Yes → treat as replace. Heat and hammering can change the steel or weaken carbide joints, and a straightened edge may not hold its shape.
   • No → re-seat it, re-torque and log it.

Why straightening is a weak default

A bent edge has already absorbed an overload. Even if it looks straight, hidden cracks near holes or at carbide joints are possible. Welding on hardened or carbide-bearing edges carries its own risks, covered in our article on welding repair. A new edge usually costs less than a second failure on the route.

After the decision

The decision is not finished until the record and the marking are done.

• Record date, truck, location of the strike and what you decided.
• Mark the hazard so the next driver sees it.
• Re-check bolts after the first shift on any re-seated or new edge.

Boundary: this is general guidance, not an engineering repair procedure. Block the plow before working under it and follow the plow manufacturer’s instructions.