Yamaha YEP-321 Owners Manual - Page 15

Maintenance 3. Use the gauze to remove dirt from the valve slide's surface then apply a little slide grease to the surface of the inner section of the valve slide. * Do not apply too much oil. * Make sure that the number stamped on the valve casing matches the number stamped on the piston. ● Rotor and valve casing maintenance As done before and after playing, apply some rotor spindle oil to the rotors and valve casing. Also, apply some lever oil to the lever shaft. 4. Slide the valve slide in and out a few times to distribute the grease evenly. ● Valve slide maintenance 1. Wrap a cleaning rod with gauze so that no bare metal is exposed. Cleaning rod Gauze ● Other maintenance Use a fine gauze to carefully clean those places that are difficult to clean such as the backsides of slides, etc. * Exposed metal can result in damage to the instrument. 2. Remove dirt from the inside of the inner and outer sections of the valve slide. 31