I just recently purchased the above used sprayer. I have watched my painter run different models for about 8 years, but I don't have a lot of experience running one on my own. So, I have been looking/searching online for a user manual for this particular sprayer but unable to find one. Any suggestions about how to find one, or if someone could give me some directions about this pump I would be greatful. I'm not afraid to try using it, but just want to make sure that I don't ruin the pump.