The day started like any other Tuesday in Q1 2024. I was reviewing the weekly delivery schedule for our Komatsu excavator mini fleet. We had 40 units allocated for a medium-sized quarry project in the Mideast, and the batch of new 228 komatsu excavator attachments had just arrived on the dock.
One of our senior operators, a guy with 20 years in the seat, flagged me down. He had this look—half curious, half concerned—and he was holding a brand-new bucket pin. "Hey, take a look at this," he said, handing it over. "The bushing fit feels… off. I want to say it's a couple thou over tolerance."
I took the pin, rolled it between my fingers. It was shiny, new, straight. The machined finish looked perfect. I glanced at the spec sheet and shrugged. The manufacturer's data sheet (our own spec from Komatsu, which we'd been using for years without issue) said the tolerance was plus or minus 0.020 inches. The pin I was holding? It was at 0.024 inches. That's four-thousandths of an inch. About the thickness of a human hair.
