Assembling Wallace gantry crane application without using a forklift truck. Assembling Wallace 5-ton steel frame, aluminum I-beam tri-adjustable gantry crane (model 5T15-A15AC) utilizing Wallace 1-ton aluminum tripod (model H3-2142), 1-ton Harrington hand hoist (model 5-214-15), beam clamps, and a spreader beam. Gantry crane is raised to its lowest height and then the jack kit (model 4405) is installed by mounting a jack on each leg so height can be adjusted up or down. The jack kit can also be mounted on the caster frame to adjust caster frame spread. The gantry crane is equipped with a Harrington 5-ton push trolley and Harrington manual hoist (model 5-114-10).