2. Check the fluids and filters
Analysis of the engine oil and hydraulic oil is mandatory during every maintenance check. Make sure there are no oil leaks. Every filter on the equipment must have its own check-off that says if it was cleaned or replaced. That includes oil, fuel, air and hydraulic filters. The fuel filter must be free of water and other contamination.
Radiator and transmission coolants tell a lot about the excavator’s state. Aside from adequate levels and normal colors, coolants should have periodic analysis to check for internal problems that can’t be detected by the eye. Check for coolant leaks, fan assembly, damage of the caps, clamps and hoses and check the functioning of the water pump.