The hydraulics on my 40 9n would go up, but not down. Figured the bottom of the pump was full of sludge... it sure was. Removed the pump and cleaned it up in diesel fuel. went it reinstall but can't figure out out to reattach the control valve fork. I removed the inspection covers and tried to use a hand through each hole to reattach the fork, but after three hours haven't had any luck. Suggestions short of paying a child with small hands to get in there and reattach it. Do most people take off the top cover to do this?