In Reply to: Gear, transmission, hydraulic oil change?!? posted by Dead Eye Dave on June 08, 2017 at 07:20:44:
" Now, five years later, the implements will drop over a period of time shorter than at first. I am wondering if I should drain and replace the fluid?"
Leaks in the system are causing the lift to drift down, not the condition of the fluid. Remove the cover plate on the right and check for leaks from the ram cylinder. The only reason to replace the fluid is if it is contaminated with water.