The Moncton – double spring time only – Part II – servicing the movement

I love this clock. It is one of my favorites. Bought in the fall of 2018, it has been on the kitchen wall and running ever since. Arthur Pequegnat clocks have a solid construction, robust movements, conservative designs, are among the most dependable and reliable clocks in my collection. this model is called the Moncton.

The Moncton was a regular fixture in offices and was then considered a “high-end” office clock. Many also found their way to rail stations across Canada. There were two variations of the Moncton, a short and a long version.

Those made before 1917 were known as the First Issue and had a tapered bottom piece. The second issue had a rounded bottom with a middle cut-out.

They are attractive clocks inspired somewhat by the Seth Thomas #2 although the Moncton has a 15-day double spring driven movement instead of the single weight of the #2.

I knew it required servicing but with so many other clock projects in the way I never got around to it. In my last post I took the movement out of its case and discovered that there is not a lot wrong with it.

The time-only movement is stamped Arthur Pequegnat Clock Company

It was dirty as expected and long overdue for a cleaning.

The movement is pretty simple with 4 wheels and an escape wheel plus the motion works. The two springs apply power simultaneously but one side can be wound if the other spring fails though the clock will run but for a shorter period.

The mainsprings are not what I expected, They are half the width of a typical time-only American clock. There is a reason for this. The Graham deadbeat escapement requires between one fourth to one half the driving power than the same clock using a recoil escapement. Less drive power means less wear over time. Having very few gears and little friction in the gear train also improves efficiency and time-keeping.

The Movement

Seth Thomas Regulator #2
Seth Thomas Regulator #2

The movement is attached to a support frame bolted to the case.

There are two screws holding the movement on the bottom that must be loosened and two long screws that go through both plates that hold it on top, much like a Seth Thomas #2.

Once disassembled I inspected the movement for wear.

I discovered the lantern pinions and pivots to be in very good condition for the age of the clock.

Time-only movement

The movement might have been cleaned at one point but there is no evidence of past repairs. The bushing holes are a little worn but not enough to warrant bushing work at this time.

Consequently, cleaning parts in the ultrasonic, polishing the pivots, cleaning the mainsprings and pegging out the bushing holes was the extent of servicing.

The movement was assembled and mounted in the clock for testing.

Cleaned and returned to the case for testing; notice the two top mounting screws

It will run for a cycle or two before I re-attach the dial and hands.

A pretty simple servicing requiring less than half a day of my time.

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