Sessions American No. 2
Sessions American No. 2 time and strike
Top plate is off
Top plate is off

This is  Part II of the Sessions American No. 2 servicing. As I mentioned in my last blog entry (Part I) this clock was running but is in need of a little attention. This is a fairly simple clock to work on for an American time and strike movement. I cannot stress enough that photos are so important when working on clocks! They are a valuable reference which take a lot of the guessing out of re-assembly.

The clock is now ready for the parts to be taken off, organized in a parts container, inspected, cleaned and serviced.

Time side spring is removed
Motion works mainspring is removed
X marks pivot holes that need to be bushed
X marks pivot holes that need to be bushed

This the back plate. No bushings have been installed but following my inspection a number of bushings are required, three in this particular corner. The topmost “X” is the location of the escape wheel. I always mark the suspect pivot holes with a marker so that I know what work needs to be performed on those specific pivot holes.

Dis-assembly is rarely an issue when working on these clocks. However, the helper springs (see arrow below) can be damaged and although they look like they might have been added by later clock repair they are indeed part of the original design and assembly of the movement and perform a vital function.  Be very careful with them though if broken they can be replaced. The helper springs and levers can be frustrating to work with particularly when lining up the levers correctly and re-positioning the helper springs upon re-assembly.

Removing lever with helper spring
Removing count wheel lever/helper spring
Removing the count wheel
Removing the count wheel

The count wheel is secured by this washer. make sure it goes back in the same way it came out.

Marking the count wheel
Marking the count wheel

Putting the count wheel in backwards will not stop the clock but it will count down the hours, not good! Not making the same mistake again I mark the count wheel so that I know that it goes in right the first time.

Time and strike parts
Motion works and strike parts separated

We each have our own way of doing things but I find it very helpful to separate the time and strike sides prior to re-assembly. It avoids confusion and makes for a more simplified process when working on your clock.

Now that the clock is disassembled it now time for further inspection, cleaning, installing bushings, and polishing the pivots which you will find in Part III.

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