Introduction
When a clock’s strike train won’t lift or enter warning, the problem is almost always mechanical alignment, lost power, or a lever that isn’t being raised correctly. This guide walks you through the most common causes and how to diagnose each one safely.
Check the Lift Sequence
Verify the lifting piece is raising the J-hook
If the lifting piece on the center shaft isn’t raising the J-hook high enough, the strike train will never unlock.
Inspect the J-hook for binding
The J-hook must move freely. Dirt, bent posts, or incorrect reassembly can prevent it from lifting.
Confirm the count lever is not stuck
If the count lever is jammed in a deep slot on the count wheel, the train cannot unlock.
Check the Warning Wheel
Verify the warning pin position
The warning pin must stop against the stop lever at the correct moment. If it’s misaligned, the train won’t enter warning.
Check for bent or missing stop levers
A bent stop lever may fail to catch the warning pin, preventing proper warning run.
Ensure the warning wheel spins freely
Binding pivots or tight bushings can stop the wheel before it reaches warning.
Check the Maintenance Cam
Verify cam alignment
The maintenance cam must be positioned so the stop lever drops into the cam notch at the correct time.
Inspect the cam follower
If the follower is bent or worn, it may not drop into the notch, preventing warning and lift.
Check for excessive wear
Worn cam surfaces can cause inconsistent lifting and failed warning cycles.
Check Helper Springs and Lever Tension
Verify helper spring placement
If a helper spring is attached to the wrong post, the lever may not return properly.
Check spring tension
Too much tension prevents lifting; too little tension prevents levers from returning.
Look for stretched or fatigued springs
Old springs may not provide enough force to reset the levers.
Check for Power Loss in the Strike Train
Test wheel freedom
With the mainspring let down, spin each wheel. They should coast freely without hesitation.
Inspect pivots and bushings
Worn bushings or bent pivots can stop the strike train before it reaches warning.
Check the mainspring
A gummy or sticking mainspring may not deliver enough power to lift the levers.
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FAQs
Why won’t my strike train enter warning?
Usually because the warning pin is misaligned or the stop lever isn’t catching properly.
Why won’t the J-hook lift?
The lifting piece may be worn, misaligned, or not raising the hook high enough.
Why does the strike train stall during lift?
Binding pivots, worn bushings, or a weak mainspring can stop the train under load.
Can a bent maintenance cam cause strike failure?
Yes. Even slight cam distortion can prevent proper warning and lift.
Should I bend levers to fix strike issues?
No. Strike problems are almost always alignment or power issues, not lever shape.
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