Sailrite MC-SCR User manual

1
Sailrite MC-SCR Power System | MCSCR MOTOR INSTALLATION
Sailrite MC-SCR Power System:
MCSCR MOTOR INSTALLATION
The MC-SCR Power System is a compact, powerful
motor that oers greater slow speed power and control
than a clutch motor. MC-SCR systems include a motor,
control box, motor pulley, motor bracket, foot pedal, and
adjustable length 3L belt.
1-5/16"
2-5/8"
3-1/8"
MOUNT THE MCSCR MOTOR
The MC-SCR motor can be mounted either to the top
or bottom of the table with lag screws. First, mark the
proper position for the motor’s bracket. Use Figure 1 as a
guide for the positioning of the mounting holes (accurate
for Sailrite 111 sewing machines). If necessary, install the
drive belt rst to help ensure proper motor position.
Measurements may vary depending on the sewing
machine and conguration. Check for a proper t before
drilling. Using a 5/32" drill bit, drill about 3/8" into the
table.
Attach the motor to the motor bracket (Figure 2).
ADJUST THE DRIVE BELT
Slide the motor pulley onto the end of the motor and
tighten the set screw on to the shaft at (Figure 4). Align
the pulley with the balance wheel belt groove and then
really tighten the screw down.
MC-SCR Power System (#100809)
Then bolt the motor and bracket to the table
(Figure 3).
Set the table and machine upright and test t for belt
length. The MC-SCR Power System comes with a 3L drive
belt which is adjustable in length (by removing links).
Insert the belt end through the holes in two layers and
then twist to lock in place (Figure 5). Tuck the loose ends
over the next V (knob). Flip the belt so the V's face in
(smooth surface facing out) and the belt is ready to use.
Underside of table

2
Sailrite MC-SCR Power System | MCSCR MOTOR INSTALLATION | POWERPLUS WHEEL INSTALLATION
Put the drive belt around the motor pulley and guide it
up and over the sewing machine's balance wheel (Figure
6). Adjust the belt tension so that is has 1/16" slack when
depressed at its midpoint. Fine tune by moving the motor
position in the motor bracket slots. Loosen the nuts,
adjust the motor position, and retighten.
PowerPlus Balance Wheel for MC-SCR (#100849)
Sailrite PowerPlus Balance Wheel for MC-SCR:
POWERPLUS WHEEL INSTALLATION
The optional PowerPlus Balance Wheel for MC-SCR is a
large diameter wheel that slows the machine down and
increases power. This wheel uses a toothed timing belt in
place of the 3L drive belt to eliminate belt slippage. It also
comes with a cogged motor pulley.
INSTALL THE POWERPLUS WHEEL
If using the optional PowerPlus balance wheel (#100847),
install the wheel after mounting the MC-SCR power
system:
1. Remove the standard balance wheel.
The original balance wheel is most likely secured
to the sewing machine's shaft by 1 or 2 screws in a
ange in or near the belt track. There may also be a
large screw at the very end of the shaft for mounting
the wheel. Remove the large screw and loosen the set
screw(s) in the belt groove area to release the balance
wheel and expose the shaft.
1/8" Gap
2. Position the PowerPlus balance wheel.
Carefully install the balance wheel bushing (select
the bushing that ts your sewing machine shaft) on
the exposed shaft so it is 1/8" from the casting of the
machine (Figure 7). Screw it down tightly with the two
allen head set screws. Then slide the PowerPlus wheel
onto the bushing and align the holes.
3. Secure the PowerPlus balance wheel.
Push two truss head screws through the wheel holes,
engage with the threaded holes of the bushing, and
tighten (Figure 8). The remaining hole in the PowerPlus
wheel (slightly oset) is for installation of an optional
handcrank.

3
Sailrite MC-SCR Power System | POWERPLUS WHEEL INSTALLATION
ADJUST THE TIMING BELT
Insert the cogged motor pulley on the end of the
mounted MC-SCR motor and tighten the set screw on
the shaft at (Figure 9). Align the pulley with the balance
wheel belt groove and then really tighten down the
screw.
Put the timing belt around the motor pulley and guide
it up and over the PowerPlus balance wheel. Adjust the
belt tension so that is has 1/16" slack when depressed
at its midpoint (Figure 10). Adjust by moving the motor
position in the motor bracket slots. Loosen the nuts,
adjust the motor position, and retighten.
Reposition the belt driven bobbin winder as necessary to
ll bobbins.

©2010 Sailrite Enterprises, Inc.
800.348.2769 toll free
260.693.2242 local
260.693.2246 fax
Sailrite Enterprises, Inc. [e-mail]
www.sailrite.com