Warner Electric SFC-120, SFC-170, SFC-250, SFC-400 Bearing Mounted, Flange Mounted - Manual (Page 8)

8 Warner Electric • 800-825-9050 P-200
• 819-0481
4. After the unit is in place, the mounting face and
pilot diameter must be square and concentric
with the shaft in accordance with the tolerances
listed on the drawings.
5. Insert a key into the shaft keyway.
6. Slide the rotor assembly onto the shaft over the
key.
7. Secure the assembly in this position by
alternately tightening the two setscrews.
8. Position the field and rotor in accordance with
the overall axial dimension shown on the
illustration drawings. Holding this dimension will
assure the proper clearance between the field
and rotor.
Bearing-Mounted Units
In bearing-mounted units, the field and rotor are
shipped as an assembly. Either this assembly or the
armature and hub assembly can be mounted on the
shaft first, depending on the characteristics of each
application.
1. Insert the key into the shaft keyway.
2. Slide the rotor assembly over the key and on to
the shaft.
3. Secure the field-and-rotor assembly in place by
alternately tightening the two set screws.
Note: The field-and-rotor assemblies for 120
units and 250 units, 1/2 inch bore,
are held in place by set screws
inserted into a set collar on the end of
the rotor hub extension. Secure the
assembly in place by alternately
tightening the screws.
4. A tab or torque arm on the field is used to
prevent rotation of the field caused by normal
bearing drag. Insert either a pin in the U-slot or
a fork around the torque arm to prevent this
rotation. Under no circumstances, however,
should the field be so tightly restrained as to
preload the bearing.
C. Assembling the Armature and Hub
1. The antibacklash armatures are shipped
assembled and ready to be installed. See
Section D.
2. The standard armature and hub must be
assembled before it can be installed. Assemble
the armatures so that the shiny surfaces size
(120 and 170) or backing plate sides size (250
and 400) are against the hub retainer ring
(Figure 3).
3. An optional release spring may be used with the
standard armatures and hubs. The release
spring forces the armature back against the hub
retainer ring when the magnet coil is
de-energized.
Follow these instructions to assemble the
armature and hub when the optional release
springs are being used.
Figure 3