Instructions for Hermle Wall Clocks with Mechanical 4/4 Westminster Chime Movement W0341 and WO351

1) Unpack the clock

Take clock, the pendulum and key carefully out of carton.

2) Transportation securing device

Open door of case. Carefully remove the protective packaging such as foam rubber, corrugated paper, rubber bands, etc. You will find the material where the hammers are, underneath the movement as well as at the end of the pendulum leader and around the chime rods. Save the packing in case the clock needs to be returned.

3) Hanging the clock

Hang up the clock so that it is vertical. The best hanger is a wood screw angled upward and screwed into a stud in the wall.

4) Winding the clock

Please wind your clock fully every 7 days for optimum performance (the clock will actually run about 8 - 9 days on one winding). To wind the clock use the enclosed key. Turn key clockwise until it stops (about 3 1/2 turns on the left winder and about 4 1/2 turns on center and right winder. The center winder is for the timekeeping, the right winder is for the quarter-hour chime, and the left winder is for the hour strike.

5) Attaching the pendulum

Hang the pendulum onto the pendulum leader (see illustration 2).

6) Starting the pendulum

Move the pendulum slightly to the left or right and release it gently. You should hear an even "tic - toc" sound. If the tic-toc is uneven or the clock stops, follow the "putting in beat" procedure in step 7.

7) Putting the clock in beat

Putting the clock in beat is the responsibility of the clock owner. While the clock was in beat when it left the factory, it may get out of beat during handling. It is a simple process, once you have tried it a few times.

Putting the clock in beat is an adjustment to make the tic and toc evenly spaced. There is a slip clutch mechanism in the clock's escapement (the part that makes the ticking sound and operates the pendulum). The slip clutch is operated by pushing the pendulum leader (see illustration 2) slightly past the point where you feel a resistance.

To put the clock in beat: Make sure the clock is hanging straight. Listen to the tic toc. Gently push the pendulum leader slightly past the point of resistance. Listen to the tic toc again. If it is more uneven, push the leader in the opposite direction and listen to the tic tock again. After several tries, you will be able to get the tic and toc sound to be evenly spaced, and the clock is then "in beat".

8) Chime

Your clock chimes the Westminster melody every 15 minutes (see illustration 1).

The chime shut-off lever is located to the left of the numeral 9.

Lever up = chime

Lever down = silent

9) Setting the clock

The minute hand (long hand) may be moved clockwise or counterclockwise to set the clock to the correct time. Never turn the hour (short) hand, it moves automatically. After two hours the chimes will be automatically synchronized.

If the clock is striking the wrong hour, move the hour hand (short hand) to point to the hour that the clock just struck.

10) Regulating the clock

To make the clock run slower - turn the regulating nut below the pendulum to the left (see illustration 3).

To make the clock run faster - turn the regulating nut to the right.

One turn of the regulating nut changes the clock's rate by approximately 1 minute per day. An accuracy of 2 - 5 minutes per week is typical.

Westminster chime melody

Illustration 1 - the Westminster chime melody


attaching the pendulum to the pendulum leader

Illustration 2 - attaching the pendulum to the pendulum leader


Regulating the timekeeping by using the regulating nut at the bottom of the pendulum
Illustration 3 - Regulating the timekeeping by using the regulating nut at the bottom of the pendulum