Introduction
When the minute hand on a Junghans clock turns freely without resistance, the issue is almost always in the motion works. This includes the friction bushing, minute-hand collet, or the interface between the cannon pinion and minute wheel. This guide explains how to diagnose the problem, how to restore proper friction, and how to ensure the strike releases at the correct time.
Why the Minute Hand Turns Freely
Loose friction bushing
Most Junghans hands use a friction-fit bushing that allows the hand to be repositioned. If it loosens, the hand spins freely.
Worn or polished cannon pinion
Wear reduces friction between the cannon pinion and minute wheel, causing slippage.
Loose hand nut
If the hand nut is not snug, the hand may rotate without engaging the motion works.
Incorrect hand installation
If the hand was removed and reinstalled, the bushing may not be seated correctly.
Motion-works wear
Worn teeth or loose arbors can cause inconsistent engagement.
How to Diagnose the Issue
Check hand nut tension
The nut should be snug but not overly tight.
Inspect the hand bushing
Look for a loose or spinning bushing in the center of the minute hand.
Test cannon pinion friction
Turn the cannon pinion gently—there should be resistance but not stiffness.
Check strike release timing
Advance the hand and verify that the strike lever lifts at the correct point.
Inspect motion-works gears
Ensure the minute wheel and intermediate wheels turn freely without binding.
How to Fix a Free-Spinning Minute Hand
Step 1: Tighten the hand bushing
Use smooth-jaw pliers to gently squeeze the bushing so it grips the arbor properly.
Step 2: Re-seat the hand
Ensure the hand sits flat and fully engages the bushing.
Step 3: Snug the hand nut
Do not overtighten—just enough to secure the hand.
Step 4: Restore cannon pinion friction
If the cannon pinion is too loose, it may need to be tightened or re‑peened.
Step 5: Verify strike timing
Advance the hand and confirm the strike releases exactly at the hour.
Troubleshooting Flowcharts
If the hand still spins freely
Check bushing → Check cannon pinion → Check hand nut → Check motion works
If the strike is early or late
Reposition hand → Check cam alignment → Check lever lift
If the hand binds
Check dial clearance → Check hand shape → Check nut tension
If the clock stops after adjustment
Check beat → Check pendulum → Check power → Check motion works
If the motion works slip intermittently
Check wear → Check arbor play → Check cannon pinion friction
Common Mistakes to Avoid
Overtightening the hand nut
This can lock the motion works and stop the clock.
Crushing the bushing
Only slight pressure is needed—too much ruins the hand.
Ignoring worn motion-works gears
Wear causes drift, slippage, and inconsistent strike timing.
Repositioning the hand without fixing friction
The problem will return unless the bushing or cannon pinion is corrected.
Forcing the hand against resistance
Always remove and reposition—never twist against pressure.
Checklist for Final Verification
• Hand bushing tight
• Cannon pinion friction correct
• Hand nut snug
• Motion works turning freely
• Strike releases at correct time
• Clock runs full duration
FAQs
Why does the minute hand spin freely?
Because the friction bushing or cannon pinion has loosened.
Do I need to remove the movement?
Often no—many fixes can be done from the front.
Why is the strike early or late?
The hand was reinstalled without aligning the strike release point.
Can the bushing be replaced?
Yes—replacement hands or bushings are available.
Is this a common Junghans issue?
Yes—many Junghans models use friction bushings that loosen over time.
2 comments
Jack, Your welcome.
Thank you.