Engineered to speed work in truck, bus, construction and farm equipment repair shops. Lincoln jacks offer dual hydraulic pumps that move the lift cap 1in. per stroke until the load is contacted. Then the power pump kicks in to provide heavy lifting capabilities. Extra-long chassis reaches under low overhangs. On air models, the air does the work. U.S.A. Lift Capacity (tons): 4, Min. Lift Height (in.): 5 1/4, Max. Lift Height (in.): 20 1/2, Operation: Air / Manual, Working Pressure (PSI): 140, Base L x W (in.): 48 1/4 x 7 1/2