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"Some contractors overlook the operator's manual," says Dave Pooley, Hyundai, "but that's a mistake. The operator's manual is a great source of reference. If you don't consult the manual, you can miss out on changes that have been made to the maintenance schedule since the last time you purchased a new machine."

For example, with the move to Tier III engines, many manufacturers upped some fluid change intervals. "If you haven't read the manual, you might not be aware of that change," Pooley says. "That means you could be missing out on some big savings. Since you don't need to change the fluids as often, you won't need to purchase as much product."

While this scenario isn't harmful to the machine's operation, other items that you miss could be. "It is extremely important to read and follow the manufacturer's recommended maintenance intervals," says Rogers. "These intervals have been designed to provide the most productive and efficient longevity of the machine."

For example, if you don't check filters, debris can impede the flow of air, oil, etc. "For air filtration, you want the filter to be free of clogs and dirt so you can get optimum performance out of your engine," says Bryan Evans, Doosan Infracore America, Corp. "And a clean filter reduces fuel consumption."

Many manufacturers now include a hydraulic reversible fan to blow out rear coolers. "Be sure to use it," says Evans. "It can help minimize overheating conditions with an engine."