Quote:
Originally Posted by J-Mech
The hydro wouldn't handle more than 3500 RPM's? A stock hydro turns faster than that. Why did it turning so fast blow the dipstick out? How exactly does a high torque affect a hydraulic pump?
You made the oil passages larger? Which ones? How did you modify the check valves? Got any pics of what you did to the pump?
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With the torque of the engine and speed of how fast it revved the hydro would not get the fluid fast enough through the charge pump.It was turning faster than it could supply fluid to the pistons and causing cavatation which filled the fluid with bubbles and caused internal pressure and blew the fluid out. Machined out the oil passages on Part D & E in the picture and i added a second spring inside the originals to make them stiffer.Replaced the springs on Part C with stiffer ones and bored seat a little where the ball fits.Milled out oil passeges on Part 35 where charge pump mounts to it. Replaced the charge pump spring in Part F with a softer one.(NOTE:After i first did all the mods,The hydro would not work at all until i changed this spring with a weaker one)