Track maintenance tool

Claim 1

A JACK FOR REMOVING AND REPLACING ENDLESS TRACKS OF THE TYPE COMPRISING A PLURALITY OF TRACK PAD ELEMENTS HAVING SPLIT BLOCKS PROVIDED WITH REMOVABLE CENTER GUIDES AND DOUBLE PINS WHEREIN THE CENTRAL PORTION OF SAID PINS ARE EXPOSED, SAID JACK COMPRISING A CYLINDER AND A CONCENTRICALLY SPACED TUBE WHEREBY SAID CYLINDER IS RECIPROCABLE IN SAID TUBE, INTERCONNECTING GUIDE MEANS BETWEEN SAID CYLINDER AND TUBE TO PREVENT ROTATION OF SAID CYLINDER WITH RESPECT TO SAID TUBE, A CLOSURE MEMBER SEALING ONE END OF SAID CYLINDER AND A PLATE SEALING THE OTHER END OF SAID CYLINDER, A PISTON RECIPROCABLE IN SAID CYLINDER AND ATTACHED TO A ROD EXTENDING SLIDABLY THROUGH SAID CLOSURE MEMBER, AN AXIAL BORE WITHIN SAID PISTON ROD WHEREBY FLUID MAY BE INTRODUCED INTO THE CYLINDER CHAMBER BETWEEN SAID CLOSURE MEMBER AND SAID PISTON, SAID TUBE HAVING A CAP SEALING ONE END OF SAID TUBE, A HELICAL COMPRESSION SPRING POSITIONED IN SAID CHAMBER AND ENGAGING SAID PLATE AND SAID PISTON, THE FREE END OF SAID PISTON ROD EXTENDING THROUGH AND FIXABLY SECURED TO SAID CAP, MEANS CONNECTING A FIRST JAW TO SAID CYLINDER AS ITS PLATE END AND MEANS CONNECTING A COMPLEMENTARY JAW TO SAID TUBE AT ITS OPEN END, SAID JAWS BEING COPLANAR WITH COMPLEMENTARY INWARDLY HOOKED CONFRONTING EDGES OF A SIZE AND SHAPE ADAPTED TO ENGAGE THE EXPOSED CENTRAL PORTION OF PIVOT PINS WHEREBY FLUID UNDER PRESSURE IS CONNECTED TO SAID AXIAL BORE TO OPERATE SAID PISTON ROD AND FORCE THE JAW ON SAID TUBE TOWARD THE JAW ON SAID CYLINDER UNDER A CONTINUOUSLY APPLIED PRESSURE.