They don't last forever. After 16 years and 7000 hours one of the seals in the band tensioner on my LT40 finally let go. I took it apart and found the ruptured seal on the pump side.
My conversation with WM customer support went like this:
WM Hello, parts department, how can I help you?
Me customer RK0xxx here, my band tensioner blew a seal
WM OK repair kit on the way, anything else?
Me Might as well throw in a couple of bandwheel belts and 2 sharpener wheels.
WM Done, Credit card and ground ship OK ?
Me Yep, have a nice day
WM Thank you
Two days later I have the correct parts in hand. Notice that the person taking the call knew exactly what equipment I had, what the problem was, and what was needed to get me going again. That my friends is professional customer service as good as it gets.
Us Woodmizer owners could get spoiled real easy.
Now a word about the band tensioner:
Never had one apart. I tip my hat to the person who designed it. Simple and elegant. Couldn't be easier to repair. Never a hint of a problem for 16 years and over 7000 hours.
