Automotive service tool

A multi-function hydraulic tool which comprises:

• a hydraulic cylinder having a peripheral wall, an open end and a closed end;
• a piston having outer and inner ends and slidably mounted in said cylinder for movement in an axial direction between extended and retracted positions thereof;
• a port in fluid communication with the interior of said cylinder for the supply thereinto of a hydraulic fluid under pressure to cause axial outward movement of said piston through said open end of said cylinder toward said extended position thereof and for the discharge of such hydraulic fluid from within said cylinder on movement of said piston axially into said cylinder toward said retracted position thereof;
• arm means secured to said cylinder and projecting axially outwardly beyond said open end thereof;
• generally semi-circular annular seating means secured to said arm means in axially spaced apart position relative to said open end of said cylinder for supporting a first member when terminal pressure is applied by said piston against a cooperating second member so in turn to cause relative movement of said first and second members;
• a blind bore formed axially in said piston opening at said outer end and having a smooth regular inner surface;
• a thrust member adapted to be positioned at said outer end of said piston, and,
• guide stud means on said thrust member having a smooth regular outer surface dimensioned to make a sliding fit in said blind bore.