i have aquired a 1972ish Jacobsen out-front 72" mower. the machine runs great except for some issues with the deck. the deck is pto driven to a 90* gearbox that turns the 3 blades via belts. due to the design of the gearbox and the 1970's seal materials, the gearbox leaks oil onto the belts and destroys them($50 a belt). i want to remove the gearbox and install 3 hydro motors on the deck and a pump running off the front of the machine. i was looking through northern tool and found a barnes gear pump that can also be used as a motor, but there are 7 differnet cubic inch sizes. the sizes are .065/1gpm, .097/1.5gpm, .129/2gpm, .194.3gpm, .258/4gpm, .388/6gpm, .517/8gpm so if i want three deck motors then i need three .129ci/2gpm motors and a .517/8gpm pump? barnes hydro pumps @ northern tool anything also besides a tank, strainer, filter, and hoses?