How to replace the hydraulic oil of a skid loader?

The method of replacing the hydraulic oil of a skid loader is as follows:
1. Clear the debris in the bucket, place the machine flat on a flat and open field, put the speed control handle in the neutral position, pull up the parking brake valve button, install the frame to fix the bumper, start the engine and run it at idle for 10 minutes, and repeatedly perform operations such as lifting the boom and lowering the boom.
2. Raise the boom to the highest position, tilt the bucket backward to the maximum position, and turn off the engine.
3. Push the bucket control handle of the pilot control valve backward to make the bucket flip forward under its own weight and discharge the oil in the bucket cylinder. After the bucket is in place, push the pilot valve boom control lever forward, the boom drops, and the oil in the boom cylinder is discharged.
4. Turn the pilot oil cut-off solenoid valve switch to the OFF position.
5. Clean the drain port under the hydraulic oil tank, unscrew the drain plug, drain the hydraulic oil, use a container to hold it, unscrew the oil filler cap, and speed up the oil discharge process.
6. Disassemble the oil inlet pipe of the hydraulic oil radiator and drain the hydraulic oil remaining in the radiator.
7. Remove the top cover of the hydraulic oil return filter from the hydraulic oil tank, retrieve the return filter element, replace the new filter element, open the refueling cap, take out the refueling filter and clean it.
8. Disassemble the tank cleaning port flange cover below the refueling port, rinse the bottom and walls of the hydraulic oil tank with diesel, and wipe it dry with a clean cloth.
9. Install the hydraulic oil tank drain plug, return filter and top cover, refueling filter, tank cleaning port flange cover, and hydraulic oil radiator inlet pipe.
10. Remove the non-return pipe on the hydraulic oil radiator, add clean hydraulic oil from the return oil port of the hydraulic oil radiator, fill and install the hydraulic oil radiator return pipe.
11. Add clean hydraulic oil from the refueling port of the hydraulic oil tank, the oil level reaches the upper scale of the hydraulic oil level gauge, and tighten the refueling cap.