If you
can start the clock and it runs momentarily, check to see if the pendulum
is rubbing anything inside the clock.
A swinging
pendulum clock must be as flat and level as possible at all times. Any
leaning or tilting will throw it out of beat or cause the pendulum to
touch something it shouldn't.
If a clock
is tilted forward or backward, the pendulum can touch something inside
the clock and will eventually slow down and stop.
Look at
the clock from the side and see it it is leaning forward or backward.
If the clock is hanging on a wall, make sure it is flat against the
wall. If it is on a shelf or mantle, try adding thin shims (such as
a few business cards) until the clock is level.
If it
takes an excessive amount of tilting or shimming, the clock movement
may have to be adjusted mechanically. This should be done by a clock
repair specialist.