Anyone know where the hydraulic level is supposed to be in the reservoir of a skyjack scissor lift? The site glass has numbers on it but i can't tell what they mean. The shop says the level will expand with use. Well the two or three lifts I looked at all had the level at the top according to the guage. Mine was at the bottom and the guy added another quart that put it in the middle. I was fine with that. I just don't see a scissor lift heating up the fluid enough to make it raise.