Grandfather clocks vigilantly keep time if properly cared for. Their constant ticking can be soothing, creating a kind of heartbeat for the home. When it's time to reset your mechanical grandfather clock -- such as when daylight saving time starts and ends -- following a few simple steps will keep the time and the clock chimes in sync.
Set a carpenter's level on top of the clock to make sure the clock is still sitting level. Make adjustments as necessary to level the clock. Make sure the pendulum isn't moving before you begin setting the time.
Move the minute hand carefully in the direction you need to go to set the correct time. If you are setting the clock back an hour, move the minute hand counterclockwise. If you are setting the clock ahead an hour, move the minute hand clockwise. When moving the minute hand clockwise, stop at each quarter-hour to allow the chimes to ring or the clock to strike. Don't move the hands while the clock is striking or chiming.
Continue until you reach the hour mark. Let the chime to go through the complete cycle and count the hour strikes.
Continue Steps 2 and 3 until you have set the clock to the correct time.
Wind the clock with its key or weights, depending on the model. Start the pendulum. Don't worry if the clock's chimes are not in sync with the time right away -- it make take a few hours for the self-adjusting feature to make the correction.
Check the clock after a day or two to see if it is gaining or losing time. Make adjustments by turning a small screw nut under the pendulum -- turn left to slow the clock down; turn right to speed it up. On some models, one turn makes a 30-second change. Adjust the screw a tiny bit each time until the desired setting is achieved. Wait 24 hours after each adjustment to see if any more change is needed.