1. Park the forklift on level ground.
2. Engage the parking brake.
3. Shut down the engine and allow it to cool down.
4. Locate the hydraulic system reservoir. It is typically a large, cylindrical tank located near the rear of the forklift.
5. Open the reservoir cap.
6. Insert a clean dipstick into the reservoir. The dipstick should be marked with a "full" line.
7. Check the hydraulic fluid level. It should be between the "full" and "add" marks on the dipstick.
8. If the fluid level is low, add hydraulic fluid until it reaches the "full" mark. Use a hydraulic fluid that meets the specifications recommended by the forklift manufacturer.
9. Replace the reservoir cap.
10. Start the engine and allow it to run for a few minutes. This will circulate the hydraulic fluid throughout the system and help to remove any air bubbles.
11. Shut down the engine and check the hydraulic fluid level again. If the level has dropped, add more fluid until it reaches the "full" mark.
12. Repeat steps 10 and 11 until the hydraulic fluid level no longer drops.
13. Once the air bubbles have been removed from the system, operate the forklift and test its hydraulic functions. Make sure that the hydraulic cylinders extend and retract smoothly and that there are no leaks.
If you are unable to remove the air from the hydraulic system, you may need to have it professionally serviced.
