Oiling rotary valves involves two key steps: oiling the valve bearings and oiling the valve itself. This ensures smooth operation and prevents sticking.
Oiling Rotary Valve Bearings
- Remove the valve cap: Locate and carefully remove the valve cap. This exposes the bearing reservoir.
- Apply oil to the reservoir: Place a drop or two of rotary valve oil (specifically designed for rotary valves) into the reservoir. Avoid over-oiling.
- Create a vacuum (for the other bearing): Locate the corresponding slide (tuning slide or valve slide). Slowly pull the slide out without depressing the valve lever. This creates a vacuum effect, drawing the oil into the bearing on the opposite side. This ensures oil reaches both bearings from a single oiling point.
Oiling the Valve Itself
While the prior steps address the bearings, the valve itself needs lubrication to prevent sticking. This requires a separate process using a different type of oil, often referred to as "rotor oil" or "valve oil". Consult your instrument's manual or a qualified repair technician for specific recommendations.
- Access the valve: This usually involves removing a tuning slide associated with the valve. The specific slide varies depending on the instrument.
- Apply valve oil: Apply a few drops of rotary valve oil directly onto the valve itself, where it rotates within its casing.
- Work the valve: Depress the valve lever several times to distribute the oil evenly.
- Replace the slide: Carefully reinsert the tuning slide.
Important Considerations:
- Use the correct oil: Using the wrong type of oil can damage the instrument. Rotary valve oil is different from piston valve oil.
- Don't over-oil: Too much oil can attract dirt and grime, leading to more problems.
- Regular Maintenance: Oiling frequency depends on how often the instrument is played. A general guideline is to oil the bearings weekly and the valve itself every few weeks, but adjust as needed.
- Cleanliness: Before oiling, ensure the valve area is clean to prevent dirt from being introduced.
- Professional Help: If you are unsure about any part of the process, consult a qualified instrument repair technician.
