How to replace a clock movement in a quartz wall clock

To replace a quartz wall clock movement, take off the hands (second, then minute, then hour), unscrew the nut on the front and lift the old movement out. Buy a replacement that matches three things: a shaft long enough for your dial's thickness, the same hand fitting (press-fit or threaded I-shaft), and enough torque for your hands; The Clock Shop recommends a high-torque movement if the minute hand is longer than 160 mm. Fit it with the washer and nut, then refit the hands at 12 o'clock.

Tools	Small pliers or nut driver, ruler or calipers
Measure	Dial thickness, shaft length, hand length, hand hole type
High torque	Minute hand over 160 mm (about 6.3 in)
Common battery	One AA
Time needed	About 15 to 30 minutes

A battery wall clock has a small plastic box behind the dial called the movement. It holds the quartz crystal, the stepping motor and the gears, and turns the hands through a set of nested shafts. When it wears out, you don't need a new clock: replacement movements are sold by clock-parts suppliers, and fitting one is a simple job. This guide is for quartz (battery) wall clocks. For mechanical clocks, see clock repair.

Does it really need a new movement?

Before you buy one, rule out the simple causes:

Fit a fresh alkaline battery and make sure it is the right way round.
Clean the battery contacts; corrosion stops many clocks.
Check that the hands don't touch each other, the dial or the glass.
Check that the movement is held firmly and hasn't come loose.

If the clock still stops, loses time or the second hand twitches without moving, the movement is probably worn out. Our troubleshooting guide covers other symptoms.

What to measure before buying a replacement

Take the old movement out first; Klockit's help centre advises measuring the movement itself rather than guessing. You need:

Measurement	How	Why it matters
Dial thickness	Measure everything the shaft passes through: dial plus any backing board	The threaded part of the shaft must come through far enough to take the nut
Shaft length	From the face of the movement to the very end of the shaft, including the unthreaded part	Too long, and the hands hit the glass; too short, and the nut won't fit
Threaded length	The length of the threaded portion of the old shaft	A quick way to match the old movement
Minute hand length	From the centre hole to the tip of the minute hand	Long hands need a high-torque movement
Hand hole type and size	Round or hexagonal push-on holes, or a slotted hole held by a small nut	The new hands must fit the new shafts
Movement size	Width, height and depth of the box	It must fit behind the dial and inside any case

The Clock Shop's guide makes the key point about glass: if the clock has a lens, shaft length is critical, because a shaft that is too long pushes the hands into the glass. Without a lens, a slightly longer shaft gives a margin for error.

Types of replacement movement

Step movement: the standard type; the second hand jumps once a second with an audible tick.
Sweep (continuous or "silent") movement: the second hand glides, and there is no tick. Good for bedrooms.
High-torque movement: stronger motor for long or heavy hands, usually needed for large and oversized clocks. These usually take matching high-torque hands.
Radio-controlled movement: sets itself from a time signal, such as NIST's WWVB in North America.
Pendulum and chime movements: quartz movements that also drive a decorative pendulum or play chimes, usually on larger batteries.

Hands and fittings: will the old hands fit?

Not always. The Clock Shop explains that hands come in two main fittings. Press-fit hands have a round or hexagonal eyelet that pushes onto the shaft. Euro-shaft (I-shaft) hands have a slotted hole with two flat sides and are held on by a small hand nut. Shaft diameters also vary between makers, so measure both the hour and minute hand holes. If the old hands don't fit the new movement, buy new hands made for that movement, matching the length of the originals so they reach the markers on the dial.

How to replace a clock movement, step by step

Remove the glass or lens, if there is one.
Remove the second hand by pulling it straight off the central pin.
Remove the minute hand. Unscrew the small nut if there is one; otherwise pull it straight off.
Remove the hour hand by pulling it off; it is a friction fit, so rock it gently as you lift.
Unscrew the hex nut or collar on the front of the dial and lift the movement out of the back. If it is glued or taped, ease it free gently.
Fit the new movement: hanger (if separate) over the shaft, rubber washer on the shaft, push the shaft through from the back, then the brass washer and nut on the front. The Clock Shop warns: do not overtighten the nut.
Fit the hour hand pointing straight up at 12, parallel to the dial.
Fit the minute hand, also at 12, and secure it with its nut if it has one.
Fit the second hand or cap onto the pin.
Insert a battery and watch the clock for a full minute and a full hour, checking that the hands clear each other and the dial, then refit the glass and set the time.

Tips and common mistakes

Keep the old movement until the new one is working; it is your reference for measurements.
Line all three hands up at 12 before you set the time, or the hour hand will sit between hours.
Bend hands only very slightly, at the base, to stop them catching.
Oversized clocks with long, heavy hands almost always need a high-torque movement and hands.
Use alkaline batteries; see battery wall clocks for why.
On an antique mechanical clock, fitting a quartz movement is reversible only if no holes are drilled and the original movement is kept; it lowers the clock's collector value.

Questions people ask

How do I know what size clock movement I need?

Measure the thickness of the dial and anything behind it, the length of the old shaft, the minute hand length and the type of hand holes. Choose a movement whose threaded shaft passes through the dial with room for the nut, but not so long that the hands hit the glass.

What is the difference between a step and a sweep movement?

A step movement moves the second hand once a second with a tick. A sweep movement moves it smoothly and silently.

Do I need new hands with a new clock movement?

Only if the old hands don't fit. Press-fit and I-shaft (euro) hands are different, and shaft diameters vary, so measure the hand holes. Matching new hands are sold for most movements.

What is a high-torque clock movement?

A movement with a stronger motor for long or heavy hands. The Clock Shop recommends one if the minute hand is longer than 160 mm.

Can I put a quartz movement in an old mechanical clock?

It can be done, but it lowers the value of an antique and is hard to undo if the case or dial is altered. A clock repairer can tell you whether the original movement is worth servicing instead.

Sources

Last updated November 6, 2026. Found an error? Tell us.