I have a 52 CA that needs hydraulic fluid. I can get pressure when I'm on a hill but not flat land. The manual I have says the hydraulic fluid goes in the fill hole under my left foot (under the deck). However, I filled that with fluid and I still can't get any pressure. Did I do something bad? Or do I need to rebuild my pump? If I need to rebuild my pump, any hints on kits or rebuild suggestions?