Warner Electric SFC-120, SFC-170, SFC-250, SFC-400 Bearing Mounted, Flange Mounted - Manual (Page 4)

4 Warner Electric • 800-825-9050 P-200
• 819-0481
Clutch SF-120, SF-170, SF-250, SF-400
Installation Instructions
A. Installing the Conduit Box
To install the conduit box on the size 400 units, refer
to the instructions supplied with conduit box.
B. Mounting the Field-and-Rotor Assembly
Flange-Mounted Units
The fields and rotors are shipped separately for
flange-mounted units. On some applications it may
be necessary to mount the rotor first, and then bring
the field into position. In other instances the field
may be mounted first, and then the rotor (mounted
on a shaft) will be inserted into place.
1. Care must be taken in selecting the location for
mounting the field assembly. Pilot diameters are
machined on the field mounting flange to aid in
holding the field in the proper position.
2. An appropriate pilot diameter must be provided
on the mounting surface as well. (Figure 1)
3. The field assembly is then fastened in place with
capscrews and lockwashers. (Figure 2)
4. After the unit is in place, the mounting face and
pilot 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 for correct size unit. 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 on 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 these
assemblies 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.
Field
Mounting
Surface
Pilot
Diameters
Figure 1
Figure 2