having trouble putting 355 spyder top down

i have a 1997 355 spider, and i am having trouble putting the top down. i am doing all the necessary steps that is required, and the top goes 3/4 down but fails to go all the way. any suggestions.

 

Immediately check your fluid level, before anything else. To continue to operate it in this condition could damage the hydraulic rams.

Here is the procedure:

http://ferrarichat.com/forum/showpost.php?p=136278178&postcount=25

While I doubt the hydraulics are that particular on the type of oil you use; i would recommend something a bit higher quality than a $4 bottle of jack oil. Most Ferrari dealers recommend using Mercedes hydraulic top fluid (ZH-M). Which, I believe is just relabeled Pentosin hydraulic fluid. I am using Pentosin CHF-11S.