What to look for when buying a used furnace?

[hramosf]

In a couple of weeks time, I will be traveling a considerable distance to take a look into a used continuous furnace we are looking into buying.

The furnace we are looking into is a Can-Eng Continuous Belt line. It is gas fired. Max temp is 960 C . The line consists of a cold loading entrance, hardening furnace, belt quench, post belt washer/temper. It will be re-bricked prior to shipment.

This will be the first time we buy used machinery, What should we look at when visiting the furnace? and tips on what to pay special attention to? What documentation should we ask the seller to provide?

Is there some kind of "buyers guide"? Maybe a list of questions that should be answered before actually buying the furnace?

All your help is much appreciated!

Thanks

HRF