Abstract
This paper develops a mobile hydraulic lifting machine for lifting heavy automobile engines in the central workshop of Olusegun Agagu University of Science and Technology, Okitipupa. It was fabricated using locally sourced materials for economic viability and affordability. Full welding was applied to all parts to avoid failure during lifting operation and avert accidents or injuries. The maximum designed load of the machine is 500 kg, and the minimum force produced by the hydraulic cylinder is 22.22 KN. The pressure generated by the Ram force with a piston area of 8.495 x 10-3 m2 was 2.616 MPa and the effort required to overcome the force produced by the cylinder was 2103 N. The maximum circumferential stress and the allowable bending stress of the cylinder were 54.413 x 106 N/m2 and 108.8 MPa which are far below the AISC recommended, this shows the beam is safe to lift without failure. The maximum shear force and the bending moment of the cantilever were found to be 17222 N and 6200 Nm respectively, and the maximum shear stress developed at the pivots were 17.54 MPa and 22.63 MPa respectively, which are far below the allowable stress. This shows that the developed machine is safe to use without failure.
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