Yamaha Tubas Owner's Manual - Page 17

The piston makes a metallic sound when moved. • The felt is torn or lost. ➞ Replace the felt with a new one. • The screws on the piston valve or valve casing are loose. ➞ Firmly tighten the screws. • The piston shaft is bent. ➞ Contact the dealer from whom you purchased the instrument. The rotor lever makes a metallic sound when moved. • There is contact or scraping with the lever's springs. ➞ Oil the lever mechanisms with lever oil. • The lever comes into contact with the pipes. ➞ Contact the dealer from whom you purchased the instrument. • The screws are loose. ➞ Firmly tighten the screws. • The rotor and valve casing have come loose. ➞ Contact the dealer from whom you purchased the instrument. Water leaks from the slides. • Not enough grease. ➞ Apply grease to the slides. Troubleshooting 33