This is a typical problem that clock owners overlook and repairman find in seconds of laying eyes on the face of the piece.
How to fix an old wall clock.
Replace the batteries if they are bad or corroded.
Place one forefinger gently on the minute hand and push it lightly over to the number 12.
Your clock will now naturally emit a series of.
Dried oil and debris can clog and stop the clock mechanism.
Fixing an old advertising clock.
Step 2 replace the batteries if the clock is running slow or it rings erratically.
Simply start the pendulum swinging and move the case gently until the tic and toc are in good balance.
Move the hour hand very gently to this number on the clock face.
But the price was right so i took it on as a project.
If dried oil is visible gently brush it away.
Wind the spring as far as it will go.
Also check that the hands aren t touching the glass that covers the encasement of the clock.
For example if you hear five bongs you need.
Brushing the mechanical works with a soft brush such as a paint brush should dislodge any dust or dirt.
If no pendulum is attached your mantle clock may be regulated by a balance wheel which is operated by a spring.
Check to see if the spring is in working order.
Dabbing a few drops of clean oil on the area then restarting the pendulum should get the clock running again.
I found this old advertising clock in a junk store in new mexico.
Open the back door of the clock carefully with a small screwdriver.