Hello everyone!
I am servicing a couple of Trane RTHD screws wich are approaching 40 000 hours each, but i cant find any specified service interval for overhaul of the screws in the documentation i have.
Are the Trane RTHD screws intended to run on condition or should they be overhauled regulary?
I have changed oil every 3 years and s.o.a.p test every year.

Cetan