Understanding the Hermle 130-020 Clock Movement

Hermle 130-020 Clock Movement

The Hermle 130-020 mechanical clock movement remains one of the most reliable and widely used movements in the world of modern mechanical clocks. Whether you’re a seasoned horologist or a clock owner looking to replace or service an older unit, the 130-020 stands out for its durability, performance, and serviceability.

In this article, we’ll break down everything you need to know about the Hermle 130-020. From identifying it correctly to installing a new one, we’ll walk you through each step to keep your clock running smoothly.

What Is the Hermle 130-020?

The Hermle 130-020 is an 8-day, spring-driven movement made in Germany. It features a rear-mounted pendulum and strikes the hour and half-hour on a single bell. This classic movement often appears in mantel/wall clocks and bracket clocks.

Hermle has manufactured this model for decades, and many top clockmakers have trusted it for both new production and replacement work. If your current clock features this model, replacing it with a new Hermle 130-020 ensures a straightforward repair process and many more years of reliable timekeeping.

Key Features of the 130-020

When you work with the Hermle 130-020, you’re dealing with a well-designed mechanism. Here are its defining traits:

• Pendulum Style: Rear-mounted pendulum
• Power Source: Dual mainsprings (spring-driven)
• Strike Style: Hour and half-hour strike on a bell
• Run Time: 8 days on a full wind
• Escape Mechanism: Platform or balance wheel escapement, depending on variation
• Hand Shaft Length: Varies slightly depending on the specific model (e.g., 130-020, 130-020/21)

This movement comes in multiple hand shaft lengths, so measuring the shaft on your old unit is essential before purchasing a replacement.

Identifying a Hermle 130-020

You can usually find the movement number stamped on the back plate of the movement itself. It reads 130-020, followed by a small suffix such as “/21” or “/42,” which often indicates the pendulum length or other minor specs.

If your movement shows the number “130-020” and looks like it has a bell mounted on top, there’s a good chance this is the correct replacement. You should also double-check the winding arbor locations, hand shaft length, and chime style to confirm compatibility.

When to Replace a 130-020 Movement

Mechanical clock movements don’t last forever. Even with regular maintenance, the typical life of a Hermle movement falls between 25 to 35 years. Here are signs you need to replace your 130-020:

• The clock stops randomly, even after winding and leveling
• The timekeeping is inconsistent
• The strike or chime no longer functions
• You see visible wear on bushings or pivots

If your movement has worn beyond repair, replacing it with a brand-new Hermle 130-020 restores your clock’s function without the high cost of complete overhauls.

Installation Tips for the Hermle 130-020

Installing a new Hermle 130-020 is a task many customers choose to tackle themselves. However, precision matters, and you should follow the correct steps:

1. Remove the old movement carefully. Take photos as you go so you can reference the setup during reassembly.
2. Measure the hand shaft length and compare it to your new unit. If it doesn’t match, you may need a different variation of the 130-020.
3. Transfer the original dial, hands, and pendulum to the new unit.
4. Ensure the strike hammers align with the bell properly. Bend the wires slightly if necessary, but do so gently.
5. Install the hands at the correct hour. For example, place the hour hand at 3:00 only if the strike counts three.
6. Secure the movement using the same mounting hardware or brackets as before.
7. Level the clock and give the pendulum a push to start the beat.

Regular Maintenance for Longevity

Once installed, you should keep your 130-020 in top shape with regular maintenance. Here’s what we recommend:

• Wind the clock weekly. Don’t skip windings, or the mainsprings can develop uneven tension.
• Keep the movement clean. Avoid placing your clock in dusty or humid environments.
• Oil every 3–5 years with proper clock oil. Never use WD-40 or general-purpose lubricants.
• Have the clock cleaned professionally every 7–10 years.

Even a quality German movement like this will fail early if neglected. Regular care ensures decades of dependable operation.

Common Questions About the Hermle 130-020

Can I upgrade the strike from bell to chimes?

No, this movement is specifically designed to strike on a bell. Changing to a Westminster chime setup requires a different movement entirely (like the Hermle 1050-020).

What’s the difference between 130-020 and 130-021?

They’re mechanically similar, but the 130-021 typically has a different pendulum length or hand shaft configuration. Always match your measurements carefully.

Do I need special tools to install it?

You only need basic tools—screwdrivers, pliers, and patience. A let-down tool helps if you plan to dismantle the old movement, but it’s not required for a straight replacement.

Is this a DIY-friendly project?

Yes. Many of our customers successfully install the Hermle 130-020 at home. We provide instructions and support for all movement sales.

Why Buy from Clockworks?

When you order your Hermle 130-020 from Clockworks, you get more than just a part. You get expertise, support, and genuine Hermle movements—not knockoffs.

We’ve been helping people repair and restore clocks for over 30 years. Our staff knows these movements inside and out. If you ever have questions, we’re just an email away.

Ready to bring your clock back to life? Order your Hermle 130-020 or get help identifying your movement at Clockworks.com, or email us at clockworks@clockworks.com.

Updated on: 06/10/2025