Introduction
The Seth Thomas 113A is a powerful and well‑built chime movement, but when the chimes stop, run weakly, or fall out of sequence, the cause is usually related to hammer lift, chime wheel timing, or power loss in the chime train. This guide explains how to diagnose and correct the most common chime issues found in the 113A movement.
How the Seth Thomas 113A Chime System Works
The chime train
The chime train powers the Westminster melody and requires strong, clean power to run properly.
The chime wheel
The chime wheel controls the sequence of hammer lifts. If out of alignment, the chimes will sound incorrect or stop mid‑sequence.
The hammer lift system
Hammers must lift evenly and fall freely. Excessive lift or friction increases load and can stall the chime train.
The chime rods
Chime rods must be properly seated and free of obstruction. Any rubbing or misalignment affects tone and power.
Warning and release
The chime train enters warning before release. Incorrect timing causes hesitation or failure to start.
Why the Chimes Fail on a 113A Movement
Hammer lift too high
Over‑lifting the hammers is the most common cause of chime‑train stoppage.
Chime wheel out of sequence
If the chime wheel is misaligned, the hammers lift at the wrong time or bind.
Worn chime‑train bushings
Wear increases friction and reduces available power.
Dirty or dry pivots
Old oil hardens and increases drag, especially in the chime train.
Chime rods rubbing or obstructed
Rods must vibrate freely. Any contact with the block or case reduces power and tone.
Diagnosing the Problem
Check hammer lift height
Hammers should lift only enough to produce a clear tone. Excessive lift dramatically increases load.
Inspect the chime wheel
Verify that the chime wheel is correctly aligned and lifting the hammers in the proper sequence.
Test the chime train by hand
With the movement let down, gently advance the chime train to feel for binding or hesitation.
Check pivot wear
Oval pivot holes or rough pivots reduce power and cause stalling.
Verify chime rod clearance
Ensure rods do not rub the block, case, or hammer tails.
Correcting the Issue
Adjust hammer lift
Lower the hammer tails to reduce lift. This is often the key fix for 113A chime problems.
Realign the chime wheel
Ensure the wheel is synchronized with the chime sequence and lifting hammers correctly.
Rebush worn pivot holes
Worn bushings cause friction and must be corrected for reliable chime operation.
Clean and polish pivots
Dirty or rough pivots dramatically reduce power. Clean and polish for smooth operation.
Correct chime rod interference
Ensure rods are straight, properly seated, and free of obstruction.
Troubleshooting Flowcharts
If the chimes stop mid‑sequence
Check hammer lift → Check chime wheel → Check pivots → Check bushings
If the chimes sound incorrect
Check chime wheel alignment → Check hammer lift → Check rod clearance
If the chimes are weak or slow
Check hammer lift → Check pivot wear → Check mainspring → Check rod interference
If the chime train won’t release
Check warning → Check release lever → Check chime wheel → Check bushings
If the chime rods buzz or rattle
Check rod seating → Check hammer alignment → Check rod clearance
Common Mistakes to Avoid
Over‑lifting the hammers
Too much lift dramatically increases load on the chime train.
Misaligning the chime wheel
Incorrect alignment causes wrong notes or binding.
Ignoring pivot wear
Worn pivots are a major cause of power loss in the 113A movement.
Oiling the chime rods
Chime rods must remain dry for proper tone.
Forcing the chime train
Forcing can bend pins or damage the chime wheel.
Checklist for Final Verification
• Hammer lift correctly adjusted
• Chime wheel aligned and synchronized
• Pivots clean and polished
• Bushings tight and centered
• Chime rods clear and unobstructed
• Chime sequence plays without hesitation
FAQs
Why do my Seth Thomas 113A chimes stop mid‑sequence?
Usually due to excessive hammer lift or chime wheel misalignment.
Why do the chimes sound out of order?
The chime wheel is likely out of sequence.
Can worn bushings stop the chime train?
Yes. Oval pivot holes are a major cause of friction and power loss.
Should I oil the chime rods?
No. Oil deadens the tone and attracts dirt.
Why are the chimes weak or slow?
Often caused by friction, worn pivots, or excessive hammer lift.
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