If you take the 4 digit code number and enter it at lincoln's website you can download the owners manual and parts pages, both of which will come in handy.

http://www.mylincolnelectric.com/Cat...ualsearch.aspx

Or you can call them up and they'll mail you a copy.

As far as the power wash, I don't know. Thats a travel at your own risk kind of thing. It can be done without hurting anything, but you have to be careful around a lot of parts.