Introduction
When a mechanical clock strikes the wrong number, the issue is almost always related to count wheel alignment, J-hook engagement, or maintenance cam timing. This guide explains the most common causes and how to diagnose each one safely.
Check the Count Wheel
Verify count wheel alignment
If the count wheel is installed one tooth off, the clock will strike the wrong number consistently.
Inspect the deep and shallow slots
The count lever must fall into the correct slot. Dirt or burrs can prevent proper drop.
Check for loose count wheel
A loose wheel can rotate out of position, throwing off the strike count.
Check the J-Hook
Verify J-hook lift height
If the J-hook does not lift high enough, the strike train may stop early.
Inspect for binding
A bent post or dirty pivot can prevent the J-hook from dropping correctly.
Check J-hook shape
If the hook has been bent incorrectly, it may not fall into the proper slot.
Check the Maintenance Cam
Verify cam notch alignment
The stop lever must fall into the cam notch at the correct moment. Misalignment causes incorrect strike count.
Inspect the cam follower
A worn or bent follower may not drop into the notch properly.
Check for cam wear
Worn cam surfaces can cause inconsistent strike timing.
Check the Warning Run
Verify warning pin position
If the warning pin stops too early or too late, the strike count will be off.
Inspect the stop lever
A bent or weak stop lever may fail to catch the warning pin correctly.
Check for power loss
Weak power can cause the strike train to stall before completing the correct count.
Check for Lever Interference
Inspect helper springs
Incorrect helper spring placement can prevent levers from returning properly.
Check for bent levers
Bent levers may not fall into the correct slots on the count wheel.
Look for dirt or debris
Even small debris can prevent proper lever movement.
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FAQs
Why does my clock strike the wrong number every hour?
The count wheel is likely misaligned or the J-hook is not dropping correctly.
Why does my clock strike too many times?
The J-hook may not be lifting high enough to reset the strike sequence.
Why does my clock strike too few times?
The count lever may be dropping into the wrong slot due to dirt or misalignment.
Can worn parts affect strike count?
Yes. Worn cams, levers, or pivots can cause incorrect strike behavior.
Should I bend the J-hook to fix strike issues?
Only if it was previously bent incorrectly. Most strike issues are alignment-related.
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