i am looking to buy a used 32 or 36. what questions should i be asking besides the obvious, service records, boom inspection, truck and pto hours?? thanks

Have you talked to fred as of yet. He knows allot about this stuff and has something like 500 used pumps listed.

http://www.usedconcretepumps.com/

The other thing i would recommend is get the pump appraised.

https://www.taylorandmartin.com/website.nsf/ConcretePumpers-Holck?OpenPage

Fred has a great selection, and I can personally vouch for Fred as a great guy to do business with.  Reed has some really nice used machines for sale right now too.

http://www.reedpumps.com/used.htm

We bought our used Reed from them.  Runs great and no problems, and it is one of their first machines ever built.