Looking for info on the main Hydraulic pump on a 233/273. Mainly the shaft style. The pump is the Joyang 7cc-L. I have Joyang specs and it lists 3 shaft styles available. Specs say keyed, 12 spline, and a tang style, I'm trying to determine what style of shaft it uses without pulling the pump. When warmer weather arrives I'll cobble together a pressure gauge to check system pressure. But at 11 years old I think its a little weak. If anyone has replaced or upgraded there pump would like to hear what you've replaced it with. External dimensions I can pull without much problem.