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Most clocks fail slowly. Long before a movement stops dead, it starts telling you something is off: a beat that hesitates, a strike that arrives on the wrong hour, a smear of dark oil around a pivot. Owners often live with these small faults for months, then wind the clock one morning and find it silent. The eight symptoms below are the ones that turn up on a repair bench most often. None of them means the clock is finished, but several mean it needs attention soon — while the job is still a clean mechanical service rather than a rebuild. Work through the list with the clock in front of you.
A pendulum clock should tick … tock … tick … tock with the gap between sounds as even as a metronome. When it limps — tick-tock——tick — the escapement is out of beat, and the cause matters.
Start with the simplest check. Is the clock hanging level? Slide the bottom of the case a few millimetres left or right and listen. On a wall clock, a slightly loose bracket or a screw driven into soft plaster is often the whole story. If a small tilt evens the beat, fix the mounting rather than the movement.
If the unevenness survives levelling, or the tick weakens as the mainspring runs down, suspect wear instead: oval pivot holes in the escape wheel, worn pallet faces, a bent crutch, or a suspension spring that has been twisted. Here is the one thing not to do — do not bend the crutch by hand to compensate. It is thin steel, and it fatigues and snaps. A snapped crutch turns a small adjustment into a proper repair.
The strike and chime trains are separate from timekeeping, which is why a clock can keep excellent time and still strike nonsense. If it strikes eleven at three o'clock every time, it is simply out of sequence — usually after a clock has been stopped, moved, or allowed to run down mid-strike — and needs setting rather than repairing.
Erratic behaviour is different. A strike that sometimes skips and sometimes runs on and refuses to stop points to gummed oil on the warning and locking levers, a weak return spring, or a chime hammer resting against a rod. Note exactly what happens and when; a repairer can diagnose more from three precise observations than from a general "the chimes are wrong".
Most minute hands are held by friction, so a hand that lags behind the chime or jumps forward is usually loose on its arbor or has a slack hand nut. Hands that touch each other, or brush the glass, often indicate a case that has settled or a bent hand. Set the clock forwards only, unless the maker's instructions say otherwise — turning some movements backwards can disturb the strike.
A dark ring or black smear around a pivot looks like a small stain. It is actually a warning. Clock oil oxidises over the years, thickens, and collects brass and steel dust until it becomes an abrasive paste that wears pivots and plates as the clock runs.
This is the stage where owners do the most damage. Adding oil on top of old residue makes the paste wetter and the wear faster. Spray lubricants are worse: they flush out whatever lubrication remains and leave a sticky film that attracts dust. And on a movement that has run dry for decades, fresh oil can loosen dried deposits and stop the clock within days — which then gets blamed on the oil rather than on the years of neglect.
A proper service means dismantling the movement, cleaning it in a suitable solution, pegging out the pivot holes, inspecting for wear, and re-oiling sparingly at specific points with the correct lubricants. That is bench work, not a job for a can.
Winding should feel smooth and firm, with a steady resistance that builds. Gritty or springy winding, a click that fails to hold, a sudden release, or a key that turns with no resistance at all are all reasons to stop immediately. A key that spins freely on a clock that still runs may mean a broken mainspring or a slipping ratchet — and a mainspring that lets go can damage wheels on its way. Never force a stiff key to prove a point.
Timing tells you which train is at fault. A scrape once per swing points to a wheel tilting into a plate through a worn bushing. A buzz at each quarter means a chime hammer is sitting on its rod. A thump as the hour begins is usually a hammer return spring. A rattle with every tick is often a loose suspension or case screw. Tell the repairer when the noise happens, not just what it sounds like.
Every mechanical clock drifts a little. What matters is the pattern. Gradual seasonal change is normal. A sudden loss or gain of several minutes a day is not, especially if regulating makes no difference.
Before assuming the worst, check the surroundings: a clock near a radiator, a draughty doorway, or a newly moved piece of furniture can shift the rate. Make sure the pendulum bob is not rubbing and that weights are not fouling the case. Then regulate in small steps — a quarter turn of the nut under the bob at a time — and give the clock a day to respond.
Look closely as well. Cracked or missing glass lets dust in and invites bent hands. A creased or twisted suspension spring will never keep steady time. Opening case joints on a longcase let damp into the movement.
Quartz clocks follow a different logic. A second hand that jumps two seconds at a time is usually signalling a low battery; a dead digit or persistent drift after a fresh battery generally means the movement is replaced rather than repaired, which is often the sensible route.
When you hand the clock over, ask what the service includes — a full dismantle and clean, or just an oil and adjust — and whether worn bushings or pivots are quoted separately. A clear answer tells you as much about the workshop as the finished clock will.
Photo: Pexels / Pixabay
