How do I fill this engine hoist???
 

Ok dumb question I bought this thing at a yard sale for 25.00 ive used it a couple times and it leaks from the cylinder, now its almost out of fluid and I dont know how to fill it im guessing its the nut on the top but just wanted to make surehttp://tapatalk.imageshack.com/v2/14...29fc9cf68f.jpg