Expert: Kenneth Saunders - 11/9/2010

Question
QUESTION: I recieved a 1977 Pearl grandfather clock. Franz Hermle, 351 05c on the back, mainspring type. Wound up nicely, start the pendulum and it works, chimes work but it will only run about 10 minutes, any idea's?

ANSWER: try;  http://www.howardmiller.com/webapp/wcs/stores/servlet/GenericView3?langId=-1&sto


might be out of beat --the tick is not even from side to side

or may be worn and or dirty and need professional attention

---------- FOLLOW-UP ----------

QUESTION: When I removed the back it looked like new but I guess dirt
could still be inside where I can not see. What is the method
used to get it in beat? The tick sounds similar but may be off
a bit, it starts out strong but slows and stops after 10
minutes or so.

Answer
-The pendulum assembly begins at the top with a 1" two legged suspension spring pinned to a brass post sticking out of the back of the rear movement plate.
  Next a silver(probably) suspension leader about 5" long that hooks onto the bottom of the suspension spring and passes through the "foot" shaped forked brass piece (and must be in the center of the fork slot and not be rubbing front or back) that connects into the inside of the movement. Newer movements have a horizontal bar that fits in the brass suspension leader slot.
  Lastly the top of the pendulum hooks onto the bottom of this suspension leader. NOW if all is correctly assembled, swinging the pendulum will get it ticking. The sound of the ticking must sound even or balanced on either side. Not over-swinging one side or the other.
  If it is not sounding even, then push with your hand the top third of the pendulum over to the side that has the excessive overswing. You may feel some resistance but gently push a bit more then try the sound of the ticking after swinging the pendulum freely.
  If the sound is not improved in the balance then do more pushing -if it is now sounding like excessive swing in the opposite direction then push the pendulum to the other side till it sounds a pretty even tick. Clock should run then. .(There is a little slip clutch that you are adjusting when you push the "L" shaped foot to either side.)
  There are a hundred things that could be wrong- you have just taken a tour through the repair of what is wrong 98% of the time!