"How do I get the air out of my hydraulic system"?
Remove the reservoir plug on the motor pump. Leave the plug out and do not put back until you have finished. Fill the reservoir 3/4 full with fluid (to the bottom of filler plug hole). Put a rag under the hole to catch overflow that will occur as system fills. Run the pump for 15-20 seconds. Stop. Check your fluid level and refill to bottom of filler hole. Continue running the motor in the same direction for an additional 15-20 seconds. When the top gets to the end of cycle, check your fluid level, fill to bottom of filler hole, and run the motor in the opposite direction.
You are literally running the top all the way up and down several times. Checking the fluid level as you go and fill as required, leaving reservoir 25% empty. When you are no longer able to add fluid, put the top in the down position. Check the fluid level one last time, should be to bottom of filler hole. Put the plug into reservoir.