How to Convert a Chain-Driven Clock to Cable-Driven

Converting a clock from chain-driven to cable-driven can improve reliability, reduce wear, and enhance appearance. Many clock owners consider this upgrade when restoring or improving grandfather clocks and other weight-driven timepieces. Knowing how to convert a chain-driven clock to cable-driven allows you to make this transition successfully without damaging the movement or case.

Convert Clock to Cable, Step 1: Understand Why Conversion Makes Sense

Not every clock needs a chain-to-cable conversion, but several situations make this upgrade worthwhile:

Wear and tear on chains — Chains stretch and wear over time, leading to inconsistent weight performance and potential damage.

Convenience and appearance — Cable-driven systems give a cleaner, more refined look and are easier to wind with a crank key instead of pulling chains.

Heavy weights — Cable systems handle heavier weights better, reducing strain on the movement and increasing accuracy.

Restoration or upgrade — When restoring a valuable clock, upgrading to a cable system may improve long-term performance and reduce the need for future repairs.

Step 2: Evaluate Your Clock

Before starting the conversion, carefully examine your clock. Check:

• Movement type — Most Hermle, Urgos, and Kieninger movements are compatible with cable conversions.
• Plate size and arbor spacing — Confirm that the new cable drums will fit the existing movement without interference.
• Weight size — Heavier weights benefit most from a cable system.
• Case height — Ensure the case has enough drop length for cables and weights.

Measure the movement, chains, and case dimensions. Take photos for reference.

Step 3: Gather the Right Tools

You’ll need several tools to perform a safe and successful conversion:

• Small screwdrivers (flat and Phillips)
• Clock mainspring let-down tool (if applicable)
• Caliper or ruler
• Smooth-jaw pliers
• Clock oil 

Clockworks offers a full line of specialized tools and conversion kits designed for this purpose.

Step 4: Remove the Chain System

Start by safely removing the clock movement from the case. Remove the pendulum, weights, and chains.

1. Lay the clock movement on a padded surface.
2. Use the chain spreader or pliers to separate the chains from the sprockets.
3. Slide the chains out carefully — do not yank or pull.
4. Keep the chains for possible reuse or as a backup.

Step 5: Install the Cable Conversion Kit

The chain-to-cable conversion kit typically includes:

• Cable drums
• Steel cables
• Crank key or winding arbor
• Mounting hardware

To install:

1. Remove the old chain sprockets from the movement.
2. Install the new cable drums in their place, ensuring they fit snugly on the arbors.
3. Attach the steel cables to the drums following the kit instructions.
4. Feed the cables through the movement and weights carefully.
5. Check for smooth operation by gently turning the winding arbors.

Step 6: Test the Movement Outside the Case

Before reinstalling the movement in the case, test it on the bench:

• Wind each cable slightly to load the weights.
• Check that the cables wind evenly without slipping or tangling.
• Make sure the drums rotate smoothly and the weights lift evenly.
• Verify that the chime and strike trains operate correctly.

Step 7: Reinstall the Movement

Once you confirm everything works:

1. Reinstall the movement into the case.
2. Hang the weights on the cables carefully.
3. Reattach the pendulum.
4. Set the beat and level the clock.

Step 8: Maintain the Upgraded System

After the conversion, keep your clock in top condition by:

• Oiling pivots and bushings every 5 years.
• Cleaning the movement every 5–7 years.
• Inspecting the cables periodically for wear.
• Avoiding over-winding to prevent cable stress.

A well-maintained cable system can last decades and improve the overall reliability of your clock.

Convert Clock to Cable: Scenarios Where You Should Convert

Here are some specific cases where converting makes sense:

• You want easier winding. Crank-wound cables are more convenient than pulling chains.
• Your chains are stretched or damaged. Cables offer a fresh start and smoother performance.
• You’re restoring a high-value clock. Cable systems improve accuracy and appearance.
• You plan to use heavier weights. Cables handle the load better and extend the life of the movement.

Convert Clock to Cable: Common Mistakes to Avoid

Skipping measurements. Always measure the case and movement before ordering a kit.

Using mismatched weights. Make sure the weights are rated for cable systems.

Failing to test on the bench. Always test before reinstalling the movement.

Neglecting regular maintenance. Keep the system clean and oiled for best results.

Convert Clock to Cable: Summary

Converting a clock from chain-driven to cable-driven is a smart upgrade when done carefully. By understanding when it makes sense, gathering the right tools, and following proper steps, you can improve the appearance, reliability, and lifespan of your clock. Always measure carefully, use a high-quality conversion kit, and test the system before final installation. For expert guidance, tools, and parts, visit Clockworks.com or email clockworks@clockworks.com — we’re here to help keep your clock running beautifully.

Updated on: 28/09/2025