Hello folks. I work at an antique store in Fredericksburg, Va that has a Monarch hydraulic freight elevator in it. I have been the Operations Manager a year and it has not posed any problems till recently and I have searched all over for any information on it and this site appears to be my best answer. If someone does have prints for a hydro elevator, or how to get any information at all, I would be very thankful!! (I found a youtube video of this exact elevator posted 2 or 3 years ago by someone who traveled here just to ride in it. I don't know if seeing it would help...) Thanks folks!