I've rebuilt two PTOs in the last month although neither were Cent21.
For the first I used TenTec's rebuild kit and replaced all parts as they
For the second, I didn't have a second rebuild kit, so I just
disassembled the PTO and THOROUGHLY cleaned the parts in denatured
alcohol removing all the old caked grease. Then I reassembled the
origional parts using the leftover green grease from the rebuild kit.
The PTO is smooth as silk! This was about a week and a half ago and
it's still fine. I'll have to wait to see how it passes the test of
Interestingly enough, my Argonaut 505 that I bought in 1972 has never
had any PTO problems.
It may be that there is more than one cause of the PTO problems, but the
grease definitely seems suspect.
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