Real novice here.
I let the hydraulic fluid get real low. Just added 2 gallons but the symptoms are the same;
Will go forward and reverse - no problem.
Tilt works.
Will raise or lower - once per hour and then..... When I want to lower, without pushing tilt button it tilts forward. When I want to raise it gives a high pitched vibrating, buzzing / noise and nothing happens. The source of the 'buzz' is hard to pinpoint - maybe the red 'thing' under the key. I was hoping pouring in fluid would fix this - please help.

To clarify - if I wait an hour or so it will go through 1 lift / lower cycle and then freeze up. By freeze up, I mean without pushing the tilt button, if I push to lower it tilts down and if I pull back to raise it buzzes.