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Not every cutting edge is created equal. “Cutting edges from OEMs and aftermarket suppliers vary in metallurgical properties — hardness, break resistance, etc.,” says Lowe. “Some are better in one type of material; others in another application. This is another area where the experience of the grader operator is important, as he often has a feel for the ‘right edge’ for the conditions — something a new operator hasn’t learned yet.”

There are steps you can take to improve accuracy when replacing cutting edges. “The single biggest tip is to change all of the edges across the length of the moldboard at one time. Otherwise, there will be a step in the finish grade,” Lowe explains. “Save the partially used edges for site prep work where the tolerances are not as critical.”

Lowe adds, “The other tip is to ensure that the mating faces of the edge and moldboard are free of dirt and grit. The bolts stay tighter and there is less chance of breakage if a hidden object is hit when doing rough work. Use a full set of new bolts, nuts and lock washers and tighten from the center out to each end, and do so with the proper torque.”

Newberry suggests that replacement of the cutting edges is a two-person job. “Use a punch to align the holes and hold the cutting edge in place to start the bolts. Use air impacts, if available,” he advises. “Make sure the edge of the moldboard is clean to ensure a good, even fit.”

You also need to make sure the motor grader is well suited to the application. “The wear will increase if the grader is not sized right for the application,” says Ferrell.