Common grandfather clock repairs include fixing a stopped pendulum, adjusting the speed of an inaccurate clock and correcting the chime sequence. Some repairs are manually fixable, while others require a professional repair service to correct.
Manual steps to fix a stopped pendulum include checking to see if the hour and minute hands are touching and making sure the clock's weight is pulled up. Additional fixes include ensuring the clock is level and making sure the clock hands are not in contact with the dial glass. If manual fixes do not solve the problem, the suspension spring is likely damaged and a service repairman should be hired to fix it.
For more information on other grandfather clock repair steps, ClockRepairService.com offers helpful repair guides.