hello I am new to this site and to the welding side of life .I was looking for a generator for my refer truck and a local welder that has done work for me, told me he was in the process of buying a new bobcat and offered me his old miller bobcat welder because of the generator .I am not familiar with welding machines he told me it has a 10,000 watt generator it is about 6 years old he asked for 1200.00. how do I inspect the welder besides turning it on and plugging in my lights to see if the generator works.it has a clock for the hours how many hours is to much? any help!!!