Any problem in a hydraulic system in any hydraulic equipment, while working, may decrease the investment to outweigh the cost of maintenance or reconstruction. The hydraulic cylinder is a main component in the hydraulic systems. In most cases of forced stop, the equipment malfunctions in the hydraulic cylinder and its components. Therefore this study aims to repair the performance of hydraulic cylinder after corrosion and determine the best ways for the reconstruction and maintenance of hydraulic cylinder. Also, to study of the electroplating of internal surface of hydraulic cylinder, which is supposed to raise the economic life of the cylinders and consequently the economic life of machine. The studied factors were:(a) treating the surface of cylinder (before treatment, turning, polishing, chromium electroplating) and measuring the force needed to move the piston in the presence of three kinds of oils ( ISO VG numbers are VG32 ,VG22 and VG10 ) as hydraulic liquids and (b) the effect of piston on the cylinder performance (without pressure ring, with one pressure ring and with two pressure rings) after each treatment on the cylinder surface, to evaluate the effect of the previous factors on the cylinder performance (measured by the specific force needed to move piston).. The final data indicated that electroplating of the inner surface of the hydraulic cylinder resulted in improving the performance of the hydraulic cylinder.