Mechanical Movements

Hermle Mini Nav

Hermle movement number starts with....

1151 1161 1171

Early movements prior to the year 1987 have just the stamp of the year on the back of the clock movement, 81 just means 1981. From 1987 on, they used letter codes instead of numbers to represent the year made. Such as the year 1987 is only marked with the letter A instead, and 1988 is the letter B.

A = 1987	B = 1988	C = 1989	D = 1990	E = 1991	F = 1992	G = 1993	H = 1994	G = 1995	H = 1996	I = 1997
J = 1998	K = 1999	L = 2000	M = 2001	N = 2002	O = 2003	P = 2004	Q = 2005	R = 2006	S = 2007	T = 2008
U = 2009	V = 2010	W = 2011	x = 2012	y = 2013	Z = 2014	AA = 2015	BB = 2016	CC = 2017	DD = 2018	EE = 2019

Hermle movement number starts with....

130+131+132 140+141 241

261 340+341 350+351

451 461+471 1050+1051

1151 1161 1171

How to install the clock pendulum

If the new leader is not installed, you will need to put the pendulum leader onto its suspension spring and hang it on the back of the clock. This is done by removing the set screw on the top of the suspension spring. With this set screw out, you can lower the suspension spring and hook on the leader hook to the bottom of the suspension spring and bring it back up to original position. Reinstall the set screw. Hang the pendulum onto its pendulum leader that you just installed.

These are the steps at this point

1. Make it run, by putting in beat
2. Install the hands
3. Adjust the chime hammers
4. Make it chime
5. Set the hands to time
6. Make it strike

Getting the clock movement ready for installation

When you get the new unit, you may or may not have orange clips over the plastic cable drum covers. These are so the cable underneath the cover will not jump over itself, and get all tangled up. They are on with just a friction fit and just pull off of each cable drum.

Put movement on the seat board with the cables hanging down in between the seat board as it was before. Screw the screws in and make it finger tight and then a little more with a flat screw driver.

Trim and moon dial off

Sometimes the hood slides off

Removed with dial attached

Another hood that slides

Putting the clock into its final position

Now your clocks all running well and together, if it stops at all check the beat tick and tock. Be sure its in a good beat. If it runs for like 3-4 days and stops, like when the weights get down to the bob area do this. You fix this by moving the top of the clock case away from the wall. Its like the whole case is swinging with the movement and pendulum in a way. And when its up against the wall on the top side then it will stop when the weights and bob are the same height.

Mechanical Movements (9)