How many hours does the loader need to change the oil and three filter elements?

The unloading load of the new loader should not exceed 70% of the rated load. After using 60-80 hours, replace the three oil filters; the oil, transmission oil and bottom filter must be replaced after 250 hours and 500 hours; after 1000 hours, the transmission oil, hydraulic oil, gear oil and brake oil must be replaced. And adjust the valve clearance.