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Hermle 340-020 clock euns ok chimes woking,will not strike hours all wheels,pinions and mainspring are in gooo=d shape. I havw 20 years clock repair experience but problem is above my skill level

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Hello,

You need access to the front of the clock movement. You will either need to remove the movement from the case or at least take the hands and face off of the clock.
There is a lifter that is pushed upward by a four pronged cam on the minute hand shaft. As you look at the front of the movement move the minute hand clockwise, you will see the lifter moving upward and dropping every quarter.
The cam on the minute hand shaft has 4 prongs, one is higher than the other three. The high spot is for the top of the hour. The lower 3 prongs should lift the lever high enough to actuate the first 3 quarters, the higher one is the only one that should actuate the top of the hour. Your lower three prongs are not lifting high enough to make the clock chime the first three quarters.
The lifter is sort of V shaped, to make them lift higher you would put a pair of needle nose pliers between the V and spread them out a little bit. When this piece is adjusted correctly the clock should actuate the first 3 quarters only but not the top of the hour. The top of the hour should only be actuated by the higher prong.

Take care.

Posted on Jul 09, 2010

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