Looking for a Crane Jack for Omega Engine Crane Omega 44940 Crane Jack is intended to be used with Omega Engine Cranes to lift with the capacity of 4 Ton. Immediately after lifting, the load must be supported by appropriate mechanical means. Omega 44940 Crank Jack features machined and polished cylinders that provide non-abrasive, leak-free, and durable performance. And, the hydraulic system also featured a patented by-pass mechanism to protect from internal damage. The body of Omega 44940 Crane Jack is fabricated from hard-cast steel with the heat-treated critical stress area. In addition, it is built with a wide, rugged base to provide the extra stability and strength. Omega 44981 Crane Jack is 8-Ton air actuated crank jack that features patented compact and powerful air turbo motor to raise the load to the desired height efficiently. (only on model 44981)- Machined and polished cylinders provide non-abrasive, leak-free, durable performance - Hydraulic system is protected from internal damage by a patented built-in bypass mechanism - A wide, rugged base provides stability and strength - Fabricated from hard cast steel with heat treated critical stress areas Specifications- Capacity: 4-Ton - Minimum Height: 19-7/8 in.; Maximum Height: 35-1/4 in. - Base Size: 5-1/8 in. x 4-1/2 in. - Hydraulic Oil: 12 oz. / 353 mL - GW: 18 lbs.