Abstract: A hydraulic jack capable of quickly lifting a load includes a frame (1) mounted with a lifting arm (2), a long connecting rod, a tray (4), a bracket and a hydraulic oil pump (3) for driving the lifting arm (2), and further includes a large pump (11) and a small pump (12) for supplying high pressure oil to the hydraulic oil pump (3). An inner cavity of the large pump (1) and a small pump core are axially connected to a hand press (8) respectively. The inner cavity of the large pump (11) is in communication with a first pressure regulation mechanism (9), and the inner cavity of the small pump (12) is in communication with a second pressure regulation mechanism (10).

Abstract: A hydraulic jack comprises a safety lock. The jack includes front wheels (1a); rear casters (1b); a pair of frame plates (1); a lift arm (5) pivotally mounted on the said plates; a saddle arranged at the free end of the lift arm; a hydraulic power unit (4) mounted to the frame plates for lifting the lift arm (5); a handle (2) attached at the frame for driving the said hydraulic power unit, wherein the said handle (2) is connected to the piston of the hydraulic power unit via a handle yoke (3).