You have done one or several things wrong. You may have broken the suspension spring that the pendulum hangs from, you may have failed to put the pendulum leader through the crutch properly, or you may have just knocked it out of beat. Find an owners manual for any grandfather clock and it should show you the proper assembly of the suspension system, how to replace the suspension spring, how to hang the pendulum leader and how to put it back into beat.
Stevens Clocks
October 2009