Hermle W0340 Clock Movement: Diagram, Regulation, Chime Shut-Off & Care Guide
The Hermle W0340 is one of the most widely used spring-driven mechanical clock movements of the last several decades. Below is a reference diagram and practical guidance for regulating timekeeping, using the chime shut-off lever, and caring for clocks equipped with the W0340 mechanism.
Hermle W0340 Diagram (Balance Wheel & Escapement Area)
The following diagram shows the top of the Hermle W0340 movement near the balance wheel and escapement assembly.
About the Hermle W0340 Movement
The Hermle W0340 (made by Franz Hermle & Sohn, Germany) has long been considered a “workhorse” clock movement—valued for its reliability, serviceability, and broad use across many traditional case styles. You’ll find W0340 variants in countless mantel, tambour, and bracket clocks.
- German-made brass plate movement design used for decades
- Spring-driven with typical 8-day winding intervals (varies by clock and configuration)
- Commonly paired with a platform escapement (balance wheel assembly)
- Often configured for time & strike and, in some models, chime variations
While case designs vary widely, the W0340’s dependable gear train and familiar layout make it a common standard in quality mechanical clocks.
How to Regulate Timekeeping on a Hermle W0340
This diagram depicts the regulating assembly around the balance wheel. Use the regulating spindle to fine-tune timekeeping:
- Turn the regulating spindle in very small increments (less than 1/16th of a turn).
- Turning the spindle clockwise will slow the clock down.
- Turning the spindle counter-clockwise will speed the clock up.
Tip: Make one small adjustment, then allow the clock to run for at least 24 hours before adjusting again. Tiny movements can make a noticeable difference.
Important: Be sure to reset the hands each time you make an adjustment so you can accurately evaluate the change.
Chime Shut-Off Lever (Sternreiter Clock Models)
Our Sternreiter Brahms tambour and Sloan bracket clocks are equipped with a manual shut-off lever for the chimes.
How to Silence the Chimes
- Move the lever to the Silent (shut-off) position.
- The clock will continue to keep time, but will not chime or strike.
How to Resume the Chimes
- Return the lever to the original Chime/On position.
- The movement will typically re-synchronize at the next quarter or hour sequence.
Care & Maintenance Tips for Hermle W0340 Movements
Even a rugged movement like the Hermle W0340 benefits from consistent care. For best long-term performance:
- Wind fully on a consistent weekly schedule (if your model is 8-day).
- Keep the clock in a stable environment (avoid heat vents, fireplaces, and direct sunlight).
- Have the movement professionally cleaned and oiled on a regular schedule (often every 5–10 years, depending on usage and conditions).
- Avoid forcing the hands backward unless your movement is designed to allow it.
With proper setup and servicing, the Hermle W0340 can provide many years of dependable operation—one reason it has remained a mainstay mechanism inside quality mechanical clocks for generations.
