Hydraulically operated forcing tool

The forcing rod of a hydraulically operated tool has thereon intermediate its ends an enlarged-diameter piston head which reciprocates in the bore of a cylinder housing, and divides the bore into a pressure chamber and a reservoir chamber. A hand-operated pump mechanism on the housing is operable to draw fluid from the reservoir chamber and to pump it under pressure into the pressure chamber, thereby causing the forcing rod to advance out of one end of the housing against the resistance of a return spring. Each of two plates removably secured to opposite sides of the housing contain to elongate chambers which communicate at one end with the reservoir chamber, and which contain spring-loaded pistons which function to maintain pressure on the fluid in the reservoir chamber.