Clock movement 241-070 and 241-040
Clock movement 241-070 and 241-040 is no longer available. The closest equivalent to that movement would be the Hermle 241-080.
The only difference with this unit compared to your old unit, is it will come with a bell on the top instead of having a coil gong (or bells) on the back of your movement. So you would remove the coil gong from your clock case because you will no longer need it. This new 241-080 Hermle clock movement will come with chains, hand nut, leader, and suspension spring. The new unit also comes with a bell on top included and installed, so now the clock will have a bell strike clock instead of a gong strike clock. Your clock weights and pendulum and clock hands will all the same as it was and these parts will work on your clock.
The bell strike sounds nice, it is more popular compared to the coil gong sound anyway.
It is still best to get the new Clock movement 241-070 and 241-040 instead of chasing the old one. To have the old one overhauled instead would cost 2-4 times the price of the new one, and would still not last 25-30 years like the new one would. You get a brand new unit instead of a shined up old unit for a fraction of the price. Comes with instructions and support from a family with 100 years of clock making and clock repairing.
- Less cost than a cleaning in most cases
- Should last 25-30 years, a repair would not
- Easy to install, we can help if needed
- Ships same day as order
Hermle mainspring barrel numbers
Hermle mainspring barrels have numbers on the barrel caps and therefore can be used to help identify the spring contained therein. Generally speaking, these numbers sometimes can only be seen by removing the barrel from the clock because of where the number is placed on the cap, but there will certainly be a number on it. The chart provided on this page lists the various numbers found on the caps, as well as the corresponding mainspring that will ultimately be found inside that barrel.
|Barrel Number||Mainspring Dimensions MM|
|10||17 x .45 x 1490|
|11||17 x .42 x 1500|
|20 & 56||17 x .38 x 1200|
|21 & 50||17 x .40 x 1200|
|31||12 x .34 x 1150|
|32||12 x .42 x 1100|
|33||12 x .32 x 1150|
|40||17 x .38 x 1100|
|41||21 x .40 x 1550|
|42||17 x .40 x 1100|
|52||17 x .42 x 1200|
|54||21 x .42 x 1900|
|55||21 x .45 x 1800|
Check for damage
Once you have obtained the size of the spring needed by the Hermle mainspring barrel number, you can therefore go ahead and find it on the hole end mainspring chart so you will be able to order a new one. Of course, if it needs a mainspring, it is quite probable that the teeth of the barrel may have been damaged when the spring broke. This is because of the incredible power of the spring. Consequently, another area that may have also gotten damaged are the teeth on the next wheel up on the train. As a result of these problems, it would be best to purchase a new movement.
Get a new movement instead
In order to identify the movement, you would first need to locate the movement number. Therefore, the back plate of the movement itself needs to be looked at. The number will be stamped right into that brass plate. Although customers sometimes think they can get the number off of the clock case, or the paperwork that came with the clock, this is not the case. The only place that number will be is stamped into the brass. As soon as you have the numbers from the movement you can go to this page to finally find your brand new clock movement.
Another problem that occurs when the mainspring breaks is the second wheel up from the barrel gets a bent arbor. This is certainly something that needs to be checked. If the arbor did get bent, you would surely need to get a new wheel, or somehow straighten it out. Indeed, it is not always easy to get it straight, so again, sometimes it is best to just get the new unit instead.
Removing a clock mainspring barrel
Often a clock mainspring barrel can be removed without disassembling the clock movements outer plates. The mainspring will also still be contained within the barrel.
Letting down the mainspring power
First you would use a mainspring let down tool. This device allows you to hold the tension of the mainspring with your fist rather than your fingers. Put the mainspring let down tool over the square post the key goes onto. With a flat screwdriver, move the "click" out of the way. The click has a tension spring that needs to be held back. This is what holds the mainspring so that it winds in only one direction. Slowly allow the mainspring to unwind in your fist. This method lets you control the speed of the unwind with your whole fist rather than your fingers. Unquestionably, doing this with a key will result in a painful experience on the fingers. Of course, if the mainspring is broken, there usually is no worry since there isn't much tension to begin with.
After the barrel is out
Once the power has been let down, the next step is to yank out the winding arbor shaft. The clock mainspring barrel should then fall out the side of the movement. After the barrel is removed, you will be able to see the number that is on the barrel end cap. This will allow you to determine what hole end mainspring to order. You can locate the mainspring by using the hole end mainspring chart. Be sure to check the movement for any damage as a result of the mainspring breaking. In particular, inspect the teeth of the gears, as well as the arbor on the next wheel up. This could have consequently been bent.
Hole End Clock Mainspring replacement service
Send us your clock barrel and we will swap out the Hole End Clock Mainspring within that barrel with a new one, and send it back. The price for this service is $75 and includes the cost of the mainspring. When you add this to the cart and check out online, you will be paying for shipping. This shipping charge is your prepayment for the barrel to be shipped back to you.
What will be done
We will be removing the broken or worn spring from the container in a safe way. Then measuring the thickness and width and stretching it out to get the length. Next we will use the chart to get the right spring from the list and then pull that spring from the inventory that is already here with us. The installation of the spring will be done with the special tool called a mainspring winder.
Sending in a Hole End Clock Mainspring replacement service
Please send the barrel with the broken mainspring to Clockworks PO Box 339 Huntington MA 01050 with a copy of your receipt for the Hole End Clock Mainspring replacement service. If you would like to send in your barrel with the broken mainspring, please pay at this link.
Installation Service $75
Clock Mainspring Damage
When a hole end mainspring breaks in the barrel, the impact may have caused Clock Mainspring Damage. This would be evident in parts of the gear train. It is possible that the pivots that go into the outer plates have bent or the arbors bent. it is best to check the clock movement's condition before ordering a mainspring.
What to check
Things to check are the teeth on the mainspring barrel that contains the mainspring. The barrel and the next wheel up gets the most impact and is where most of the damage would be, if there is any. Be sure non of these teeth on the gears are bent or broken. The next thing to check is the arbor on the next wheel up, as it gets bent often when the mainspring breaks. If the movement is damaged beyond reason, it maybe best to just get the new movement if there is one available. The other option is send it to us for an overhaul here at clockworks.com. We will repair these items but also clean, oil, re-bush and test the unit during this time also.
Get a new movement instead
If the movement is 25-30 years old, it has lived its life anyway. A new movement would be the best thing at this point because of the cost and time it would take to make it right.
If you would like to explore the new movement option rather than replacing the mainspring, Please provide the movement numbers off of the back plate of the movement itself and email this information to [email protected] There is another option also, just send us the clock mainspring barrel and we will swap it out with the correct new mainspring for a fee.