1. Under the tugboat of Sany mixer, four heightening joists are respectively installed and bolted between the wheel and the frame to ensure firmness.
2. Connect the heightening bolts between the heightening joist and the frame with bolts, and fix the heightening bolts on the heightening joist.
3. Lift the trailer with a jack, remove the original tires and wheels, and insert the heightening bolt into the shaft hole.
4. Install new heightening tires and wheels, make sure they are installed correctly and fixed with bolts.