Portable earth boring machine

An earth boring apparatus for drilling vertically extending holes and pushing casing sections therein, said apparatus comprising, in combination, vertically extending track means;

• casing pusher means on said track means for engaging the rear end of a casing section;
• pushing cylinder means for moving said casing pusher means along said track means and including an extension chamber and a retraction chamber;
• auxiliary frame means for disposition at a location remote from said main frame means;
• an engine mounted on said auxiliary frame means;
• pump means driven by said engine for delivering pressurized fluid to said pushing cylinder means;
• conduit means connecting said pushing cylinder means with said pump means;
• control means including a directional valve means in the flow of pressurized fluid from said pump means to said pushing cylinder means, said directional valve means including a closed center position for isolating both of said chambers from said flow, an extension position for pressurizing said extension chamber and draining said retraction chamber, and a retract position for pressurizing said retraction chamber and draining said extension chamber;
• volumetric flow varying controller in said control means and including a low flow position for delivering a relatively low volumetric flow from said pump means to said pushing cylinder means and a high flow position for delivering a relatively high volumetric flow from said pump means to said pushing cylinder means;
• a first manual actuator for said control means for selectively positioning said directional valve means in said center, extension, and retraction positions;
• a second manual actuator for said control means for selectively positioning said volumetric flow varying valve means in said low flow and high flow positions;
• and variable flow control means in the flow of pressurized fluid from said pump means to said directional controller , said pump means including a first pump for delivering a first flow of pressurized fluid to said directional valve means, and a second pump for delivering a second flow of pressurized fluid to said volumetric flow varying controller.