My friend helped my professor, despite the fact that he belongs to another laboratory

I know he is so earnest that he can devote himself to tasks he has nothing to do with for the sake of himself.
Today, an instrument was out of order. And, the professor asked him to help the professor repair the instrument. He willingly undertook the task.

At this point, he must be an ideal researcher.
But, I am afraid that his diligence can make him dead from overwork.