Abstract: A hydrant tool assembly for installing or removing a seat ring and valve from a hydrant shoe located beneath a hydrant and including a valve cap structure that mates with the valve and extends through a top portion of the hydrant. A hydraulic apparatus is provided that is attachable to the top portion of the hydrant for providing a torquing force to the valve cap structure. Further, a lever structure is provided that is attachable to the hydraulic structure for enabling leveraged manual turning of the valve cap structure to supplement the hydraulic torquing of the valve cap structure.