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Trombone Owners Manual

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Cecilio trombones are precision made instruments and are tested at our factory. Prior to shipping each instrument is inspected by skilled technicians at our Los Angeles distribution center.

Getting Started

You must assemble, clean, and tune your new Trombone prior to playing. Trombones are delicate instruments and can be damaged easily. Handle with care. If you have a trombone instructor we recommend you see him or her to assist you with assembling, cleaning and tuning your instrument for the first time.

If cannot wait, follow the steps below:

  • Remove the main slide from its case. The main slide is delicate so be careful not to bang it 
    against anything.
  • Insert the connecting sleeve into the bell section and tighten the bell lock to secure in place. Make sure that the spit valve on the main slide is on the bottom. The slide should be to the right of the bell at a 90° angle. The bell and slide should not make contact.
  • Always hold your trombone by the slide brace while resting and make sure the slide lock is locked when the trombone is not in use


  • Hold the trombone vertically with the bell towards the ground. Gently drop the mouthpiece into mouthpiece receiver letting the weight of the mouthpiece form the connection. To get an airtight seal twist the mouthpiece clockwise 1/4 turn


Never force the mouthpiece in place. Avoid knocking or striking the mouthpiece inward. This can cause the mouthpiece to become permanently stuck. If your mouthpiece becomes stuck please visit your local repair shop. They have special tools to remove mouthpieces. Never use pliers or other gripping tools to remove a stuck mouthpiece.


  • Pitch is affected by temperature, so be sure to warm up your instrument before playing by blowing air through it.
  • Tuning your trombone is done by adjusting the tuning slide until you achieve the desired pitch
  • The tuning pitch for the Bb trombone is Bb, played using the 1st slide position in the 3rd partial.
  • Fine-tuning of the intonation is done with the embouchure and the main tuning slide


While playing, saliva accumulates within the instrument. To prolong the life and playing condition of your instrument this fluid must be expelled on a regular basis with the water key. The water key is located on the main slide

  • Hold the trombone at a 45 degree angle towards the ground
  • Holding the spit-valve open, blow through the instrument to expel excess fluid.


Lubricating the Hand Slide

  • Carefully remove the outer slide and lay it on a clean, flat surface.
  • Wipe inner slide clean of old cream, dirt, and foreign substances.
  • Apply a small amount of slide cream to the stocking of the inner slides (the part that is slightly thicker than the rest). Spread evenly, until it is coated with a thin film. Do not apply too much slide cream as this will hinder the movement of the slides.
  • Use a trombone spray bottle to spray water evenly over the inner slides.
  • Replace the outer slide, moving it back and forth to spread the lubricant evenly.

Lubricating the Tuning Slide

Slide grease keeps slides airtight and maintains smooth movement. It is an essential factor in the care of your horn. To apply slide grease:

  • Remove the tuning slide and wipe clean of dirt and foreign substances.
  • Apply a thin coating of slide grease to the inner slide surface. Replace the slide, working it in to ensure that the grease is evenly and thoroughly spread.

Cleaning the Mouthpiece

  • Soak the mouthpiece in a solution of warm soapy water. Using a brass mouthpiece brush scrub the inside and outside
  • Rinse thoroughly with clean, warm water.

Cleaning the Water Keys

  • A tone hole cleaner may be used to clean and dry the water keys.

Other helpful hints

  • Avoid fluids that contain sugar prior to playing. If drinking or eating prior to playing rinse out 
    your mouth.
  • Remove your trombone from its case by lifting it from the lead pipe and bell
  • Always remove the mouthpiece from your trombone when not in use
  • Always store your trombone in its case when not in use to prevent damage
  • Your instrument is a valuable item and should be treated with respect. By following the guidelines above your instrument should provide you and your listeners with yours on enjoyment
  • If you remain uncertain after reading these guidelines on how to assemble and clean you’re Cecilio Trombone, seek advice at your local music store or from a music teacher.
  • Damage caused by incorrect assembly and/or inappropriate handling will not be covered 
    by the warranty.

Cecilio Musical Instruments Warranty Information

The terms and conditions listed here will govern all warranty claims for Cecilio Musical Instruments products.

These terms and conditions cover all instruments manufactured and distributed by Cecilio Musical Instruments. There is no additional warranty, express or implied.

Cecilio Musical Instruments warrants its instruments to be free of defect in material and construction for 1-year from the date of purchase. Warranty excludes accessories and cases. Please see below for limitations and restrictions to this warranty. Cecilio Musical Instruments will, at its option, repair or replace any item found to have been defective in materials or manufacture under the terms stated here. Cecilio Musical Instruments shall be the sole arbiter of eligibility for warranty repair or replacement. Cecilio Musical Instruments liability is limited to repair or replacement of defective items.

To be eligible for warranty coverage, the original purchaser of the item must present the defective item, together with the original receipt of purchase, to the dealer from which it was purchased. The dealer will then make arrangements with Cecilio Musical Instruments for repair or replacement of the defective item.

Cecilio Musical Instruments reserves the right to make changes to this warranty. The policies in place at the time of purchase will be honored.


  • 1-year warranty applies only to original purchaser of instrument
  • Warranty does not cover strings, reeds, cases or other free accessories
  • Damage caused by neglect or misuse of instrument is not covered
  • Delicate instruments are affected by climatic conditions. Exposure to excessive heat, cold, dryness, or moisture is considered neglect
  • Instrument adjustment is not covered by this warranty
  • Normal wear caused by normal use of items is not covered by this warranty
  • Natural products, such as wood, cannot be guaranteed against cracking, seam separation, warping of fingerboard or chipping

Pursue your musical dreams by selecting one of our handmade instruments today!