Yamaha YEP-321 Owners Manual - Page 13

Maintenance ■ After Playing After playing the instrument, make sure that moisture or dirt is removed from it using the procedure described below. ● Valve slide maintenance 1. Depress the piston or lever that corresponds to the valve slide you want to clean, and remove the slide. ● Oil the pistons As done before playing the instrument, apply some valve oil to the pistons and move them up and down a few times. (See page 24) ● Oil the rotors (Rotary tuba only) As done before playing the instrument, apply some rotor spindle oil to the rotors and move the levers a few times. (See page 24) * Removing the valve slide without holding the piston down creates a drop in air pressure within the pipe, creating a suction which can result in poor piston function or damage to the inside of the pipe. 2. Remove moisture from the slide. Also, remove moisture from the water key. ● Water Pot Maintenance (YEP-842 Euphonium only) 1. Slide the water pot to the left or right to release, then slide it down to remove. water pot Nipple Water Key * The valve slides are made of brass or nickel silver which are both excellent at resisting corrosion. However, corrosion may appear if moisture is left in the instrument for an extended period of time. Please use caution. 2. Remove any moisture or oil from the water pot onto a cloth, etc. Clean the inside of the water pot with running water. 3. Align the holes on the water pot with the nipples on the bottom of the valve casings then, as you did when removing the water pot, slide it to the left or right (either direction is OK) to reattach. 29