Speed adjust without mechanism Mantle clock

[RichL]

I have a Hamilton mantel and need to adjust speed.

 

[RichardHarris123]

Hello and welcome.  I know very little about clocks but we will need photos, plenty of clock experts on here. 

[RichL]

Somehow the regulating gears and lever are missing. Is there a way to adjust levers or gears to slow ti down? Gains about 5 minutes a day. Maybe add weight to the wheel (top middle)? Sorry I don't remember the proper names of the parts.  I'll try to attach a picture of the clock works. Some numbers I can read are 340-020

 

Edited June 22 by RichL

[praezis]

Adjustment is made on the balance wheel. Post a pic from above.

[HectorLooi]

I think you have a Hermle 340 020 floating balance clock. There are videos on YouTube that show you how to regulate the clock.

Let me search for one.

 

[RichL]

You are the winner! I had a clock guy years ago tell me the adjustment was missing! I have the model shown in your picture with + and -, the adjustment on the balance wheel. I moved it toward the - side. Will report back in a few days how it goes. Rich

Edited June 22 by RichL

[RichL]

Do you know how many years I have been having to correct the time every couple days? I could shoot that guy that said it couldn't be adjusted.

[HectorLooi]

I'm not sure if you can correct 5 mins a day by turning the regulator. If you can't correct it even after turning the finger wheel all the way to the left, then you will have to add weights the the wheel. There is another video that shows how to do that.

[RichL]

I think I stated the amount wrong, think it is more like 5 minutes every 3 days. So far today after 8 hours it is running correct. I moved the adjustment 3 or 4 notches left. If I can't get it correct with the adjustment I'll get out my BFH

Edited June 22 by RichL

[RichL]

OK I have the speed adjustment set pretty good, off less than a few seconds a day. Now I am wondering if I am not winding enough is a problem? I have been winding once a week. What is recommended  interval? I have the chimes turned off.

Edited Sunday at 06:20 PM by RichL

[HectorLooi]

The Hermle 340 020 is a 8 day mechanism. Winding it once a week is good. Can it run properly for the entire week?

If the clock has not been serviced recently, a full disassembly, cleaning and oiling would be advised. If you intend to undertake the task yourself, many of us can guide you through. But @oldhippy would be your bet when it comes to anything clock related. He has helped me much over the years.

You will need some essential clock repair tools like a power let down key and a mainspring winder. The mainspring winder can be rather expensive, costing about $300 to $500. So, unless you plan to repair a lot of clocks, it might make more sense to send it to a reputable clockmaker. ( Not the one who told you that the adjustment mechanism is missing. )

[oldhippy]

If the time is out I would say it might need working on. The floating balance normally keep good time.  

[RichL]

Thank you Hector