Yamaha Cornets Owner's Manual - Page 7

Before You Play ■ Applying Oil To The Valve Slides 1. Depress the piston that corresponds to the slide that you want to apply oil and partially remove the slide. Apply a few drops of tuning slide oil. Tuning slide oil ■ CAUTION-Preventing The 3rd Valve Slide From Falling Off. On instruments fitted with a stopper screw, make sure the screw is tight. Stopper screw * Do not apply too much oil. 2. Hold the piston down and move the slide in and out a few times. 3rd valve 3rd valve slide ■ Setting The Mouthpiece Insert the mouthpiece into the mouthpiece receiver so that the mouthpiece is not loose in the receiver. Mouthpiece * If you remove or replace the valve slide without holding the piston down, the drop or buildup of air pressure in the pipe can cause poor piston function or damage to the inside of the pipe. * The pistons must be oiled for them to function properly and smoothly. After applying slide oil to valve slides equipped with a spring type slide trigger, hold the piston down and move the slide in and out a few times as you did before to distribute the oil evenly. Also, apply a small amount of oil to the trigger's shaft and screw. * Never force the mouthpiece into the mouthpiece receiver. The mouthpiece may become jammed making removal difficult. 19