I have a 30 kw military generator and you can buy books on them . Just google your set description .
I haven't had any problems with mine. The government doesn't manufacture generators so All military generators are manufactured by private enterprise and it shouldn't be hard to get parts if the company is still in business.
Mine is 120/208 3 phase and I use it to pick up my whole house electrically.I have a 4 ton heat pump and my installation is single phase.I just feed thru a breaker to my panel and open my main breaker when I use it.I just use two phases and the neutral.It does the job.
It works fine and I don't anticipate problems . I just use it in emergencies anyhow and have used it only once.I run it two hours once a month to keep it lubricated good, the moisture driven off, and the fuel fresh in it.
If something happens to mine I believe I could get parts.It has a white diesel engine .Thats pretty common.