Combining industrial-duty casters with hydraulic lift system, caster lift system allows transport devices to provide positive stability when stationary. System Crank 4-HR 1403 D100 (Part No. 501.10001) consists of 4 heavy-duty swivel casters (standard) with built-in hydraulically driven leveling feet; up to 10 lifting casters can be operated with one pump. System functions independently of load, and 4 lifting cylinders operate synchronously. Max system load is 660 lb with 0.6 in. lift height.