Dear Sirs, I have a Wheel Horse 416H Garden tractor and I am low on transmission fluid. I have NAPA brand Heavy Duty Hydraulic and transmission fluid and need to know if that fluid is good for installing in it. Let me start from the beginning, to explain what is happening. My hydraulic mower lift stopped raising so I checked the fluid level and saw that it was low. I just need to know if this level of fluid affects the deck lifting and what kind of fluid I should refill it with. Can you help?