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Clocks, Watches/time adjustment on a 340-020


I have this clock and it keeps loosing about 10 mts a day. I tried moving the adjustment to the max on the balance wheel but it barely makes any difference. The clock works fine but no amount of adjustment seems to speed it up. It does have the two weights that limit the amount I can push the 3 pronged adjuster.
Please advise.


Ron, the Hermle 340-020 has one of two types of regulators.  One is the original floating balance (not manufactured any longer) which has a vertical spiral spring above the balance wheel.  The later model is referred to as the balance wheel type which has a hairspring like a watch.  This type is more quirky and more has to go into the correction process. On either type we service the movement which includes disassembling, cleaning, inspecting and adjusting or repairing any problems we see.  Then the regulator is cleaned in as different solution, checked and either repaired or replaced if necessary.  Because of the critical adjustments, some clockshops will not take these in for service.  However, I will say that most can be serviced successfully.  In our shop, we will work on the latter balance wheel types only if we install a new mainspring and use now available ball-bearings on what we call the "time second wheel.  

If your movement hasn't been serviced in the last 10 years, it would be time to do that anyway.  Bottom line is that if you have adjusted the regulator to the max in the proper direction and it does not affect the regulation, it would be best to have a clockmaker experienced in servicing the balance wheels.  BTW, by your description, I suspect that you have the floating balance. I'm not qwuite sure of what you mean by the two weights limiting the adjustment, but that's probbly just a difference of description.  If you will send a photo of the back of the movement to me (email address below), I will check it out and see if there is anything I might be able to suggest before you take it to a shop.

John Newman
Vintage Emperor Clock Consultant
Old Prattvillage
Prattville, Alabama

(Due to the number of Allexperts questions and
the workload I have at my clock shop, I regret
that I cannot answer personal email questions on a timely basis
other than Allexperts follow ups.)  

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John Newman


As I am not a certified appraiser I do not give values of clocks over the Internet. There is very little published information on what I consider to be the value of "modern production clocks". However, considerations are what the clock originally sold for, the condition of the case and movement, and particularly the area in which you live, the demand and the economy. ALSO, WATCHES ARE NOT MY FIELD. However, I can advise the clock owner on proper maintenance of a clock to keep it running, small corrections and adjustments and how to move a clock without damaging it. I can also advise on obtaining parts for clocks. As clock case model label numbers are difficult to relate to the movements, it is helpful if you can give me the information usually found on the movements themselves. Modern clock movements usually have the information on the back plate of the movement. I have been a clockmaker for about 40 years and was plant engineer in the mid 90's and later operations and engineering consultant at Emperor Clock Company in Fairhope, Alabama. I now have my own clock shop in Prattville, Alabama.


One of my greatest accomplishments was traveling to China to assist a clock factory in building clocks to the standards which we required at Emperor. With the proper specifications and quality control, some beautiful clock cases were built. The factory people from the wood carvers to the plant manager were very congenial, friendly and I left a lot of wonderful friends when I returned from my trips.

NAWCC (National Association of Watch and Clock Collectors) 30 years Prattville, Alabama Chamber of Commerce

Horological Times, a publication of the American Watch and Clockmakers Instute. Collaberated column author, with Photos and ideas for clock movement conversion article.

Associate of Science Mechanical Engineering Technology Emperor Introductory Clock Repair (Eventually taught a portion of the class after becoming employee)

Awards and Honors
Small Business of the Quarter (Prattville, Alabama) Leadership Class of 2009 (Autauga County, Alabama)

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