Check the fluids and filters
Analysis of the engine oil and hydraulic oil is mandatory to 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. Check the fuel filter. It must be free of water and other contamination.
Check if there is an adequate level of radiator and the transmission coolants. Check for coolant leaks, fan assembly, damage of the caps, clamps and hoses and check the functioning of the water pump.