Yamaha Cornets Owner's Manual - Page 11
Rotor maintenance, Rotary trumpets only, Valve slide maintenance
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Maintenance ● Rotor maintenance (Rotary trumpets only) 1. Remove the rotary valve cap and apply some rotor spindle oil to the place to the spindle in the center of the rotor. Rotor spindle oil ● Valve slide maintenance 1. Apply a thin coating of slide grease to the main tuning slide, 2nd valve slide, and valve slides that are not equipped with a slide trigger. Slide grease 2. Apply some rotor spindle oil to point where the rotor rotates. Replace the rotary valve cap and move the lever a few times to distribute the oil evenly. Main tuning slide 2. Slide the main tuning slide back and forth a few times to distribute the grease evenly. 3. Apply some lever oil to the lever shaft. Lever oil Main tuning slide 3. On the 1st and 3rd valves, which are equipped with slide triggers, apply a small amount of tuning slide oil to the tuning slides. Tuning slide oil Apply here. 3rd Valve Slide 23