Introduction
A mechanical clock must be in beat to run reliably. If the tick and tock are not evenly spaced, the clock will stop or behave erratically. This guide explains the most common reasons a clock won’t go into beat and how to correct each issue safely.
Check the Clock’s Level
Verify side-to-side level
A clock out of level will not produce an even beat. Use a small level across the movement posts or case.
Check front-to-back level
Some movements are sensitive to front-to-back tilt, which affects crutch and pendulum interaction.
Test beat by tilting
If the clock only runs when tilted, the beat is off and the crutch needs adjustment.
Check the Crutch Position
Inspect the crutch-to-pendulum relationship
The crutch must push the pendulum evenly. If it’s bent or misaligned, the beat will be uneven.
Adjust the crutch
Gently bend the crutch in the direction opposite the tilt required to make the clock run. Make small adjustments.
Check for loose crutch collet
If the crutch collet is loose on the verge arbor, the beat will drift and never stay set.
Check the Pendulum Assembly
Verify pendulum clearance
If the pendulum rubs the case, backboard, chime rods, or crutch slot, the beat will be uneven.
Inspect the suspension spring
A twisted or bent suspension spring can prevent the pendulum from swinging evenly.
Check pendulum leader alignment
The leader must hang straight and interact cleanly with the crutch.
Check for Power Issues
Weak power affects beat
If the train lacks power due to dirt, worn bushings, or a weak mainspring, the beat will sound uneven.
Inspect pivots and bushings
Worn or dirty pivots cause drag, which disrupts the beat rhythm.
Check escape wheel tooth condition
Bent or worn teeth can cause irregular impulse and uneven beat.
Check the Escapement
Verify pallet lock
Uneven lock on the pallets will cause an uneven beat and may require adjustment.
Inspect pallet wear
Worn pallet faces can cause inconsistent impulse and beat irregularities.
Check verge position
If the verge is too high or too low, the beat may be impossible to set.
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FAQs
Why won’t my clock stay in beat?
A loose crutch collet or pendulum interference often prevents the beat from staying set.
Why does my clock only run when tilted?
The beat is off. Tilting compensates for incorrect crutch alignment.
Can worn bushings affect the beat?
Yes. Worn bushings reduce power and cause uneven impulse.
Does the suspension spring affect the beat?
A twisted or damaged suspension spring can prevent even pendulum motion.
Should I adjust the escapement?
Only after verifying level, crutch alignment, and pendulum clearance. Escapement adjustments require precision.
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