Brass Counterweight Timing - Janome QMP16SU Manual

Check #6: Brass Counter Weight Position Timing
The Janome QMP16SU utilizes a counter weight for improved balance throughout its speed spectrum.
The counterweight has two functions. It acts as a collar to remove axial play and as a counterbalance to
minimize up an down (hopping) movement in the machine. Therefore the counter weight positioning is
very important both axially and radially. This part does not utilize a flat on the shaft for its positioning (even
if the shaft has a flat).
The counterweight is positioned axially (left to right) to remove all main shaft axial play, without creating a
tight spot. It is radially positioned on the shaft to enhance the weight of the pitman to better balance the
machine. It is positioned so as to remove all axial play in the main shaft without creating any tight spot. It
is then rotated radially on the main shaft to the correct position to help balance the machine. After both of
these are correct it is fully tightened.
1. Remove any axial play between the pitman and the
counterweight/collar. For more information see check
#1 on the next page.
2. Turn the hand wheel until the first screw in direction
of motion is straight up. In this position the flats on the
main shaft will also be straight up. The slit on the
counterweight is positioned straight down with its screws
straight out to the front of the machine.
3. Tighten firmly with an "L" hex tool the two screw on the
counterweight.
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1st screw straight up
screws straight out
slit straight
down