For most mining procurement teams, cooling tubes are a routine line item — until they aren't. A failed tube in a CAT 793D haul truck at a high-altitude desert mine doesn't just mean a replacement order. It means an unplanned stoppage, a vehicle pulled from rotation, and a maintenance crew working against the clock in conditions that make everything harder.

This is the story of how one of the world's top-ten mining operations solved a persistent cooling system problem — and why, ten years later, they're buying more Sinrui tubes in a single quarter than they purchased in the entire previous year.

For the CAT 793D fleet, this means the cooling system carries a sustained load that would be considered peak demand elsewhere. Cooling tubes, in particular, are exposed to the full force of these conditions across every shift.

Phase one: OEM and premium aftermarket. Quality was reliable. But lead times were long and unit costs were high — a combination that worked against the mine's need for responsive, cost-controlled maintenance. Budget pressure and supply chain timing issues pushed the team to look for alternatives.

Phase two: Alternative Chinese suppliers. The price point was attractive. The reality was not. Quality varied between batches, and in the worst cases, tubes that should have lasted several years were failing in under twelve months.

Each premature failure triggered a replacement cycle that consumed far more in labour, downtime, and logistics than the initial savings on the part. When a 793D haul truck is out of rotation, the cost is not the tube — it is everything else that stops moving with it.

The mine's procurement team approached Sinrui with a trial order. 

The product in question: 1,188mm cooling tubes engineered for the CAT 793D, manufactured to OEM-equivalent dimensional and thermal specifications.

The trial order moved into regular supply. 

Regular supply became a long-term partnership.