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And while bypass valves enable fluids to flow to their intended component even if the fluid filter is clogged, that lubrication will be done with a dirty product. This can lead to early wear, and eventually component failure.

When you extend fluid change intervals beyond recommendations, you sacrifice the product's ability to do its job to the best of its ability. Consider that it's not just the oil that can break down. "Fluids are really a package," says Pooley. "There are specific additives that can break down and lose their protective qualities. If the manufacturer suggests that oil be changed at 500 hours, it won't offer the same protective qualities beyond that time period."

Pooley also advises sticking with manufacturers' recommended lubricants, and implementing an oil analysis program that can alert you to increasing wear or potential component failure. "Choosing a good brand of oils and filters is important," he says. "Most manufacturers will provide a list of recommended products. Following this recommendation is especially important if the machine is new enough to be under warranty. If you don't, the manufacturer may not honor [the warranty] if something goes wrong."

Extra care for harsh conditions
If you operate wheel loaders in extremely harsh environments, or in multiple shifts, adjust the maintenance schedule accordingly.

"Any high-production, demolition, waste treatment or other jobsite could potentially shorten a loader's life in operation if proper maintenance... is not performed," says Rogers. "Contractors should always perform the maintenance intervals as recommended, and always make sure the machine matches the operation and weight of material being handled."