Warner Electric SFC-1525 - Manual (Page 4)

4 Warner Electric • 800-825-9050 P-207 • 819-0516
f. Slide the rotor assembly over the key and
onto the shaft.
g. Place the edge of the rotor 1/16" - 1/8"
before the line that is inscribed into the O.D.
of the field.
h. Lock the rotor into place by alternately
tightening the two locking screws in the
bushing. As the screws are tight ened, the
rotor normally is pulled 1/16" - 1/8"
further
onto the bushing (towards the field).
When the rotor is secured tightly on the
bush ing, the edge of the rotor must be
ap prox i mate ly even with the line
inscribed in the field. The over all axial
di men sion from the face of the rotor to the
back of the field flange is shown on the
illustration draw ings. Squareness and
con cen tric i ty tol er anc es must also be held
as specified on the draw ings to assure that
the unit functions correctly.
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,
de pend ing on the characteristics of each application.
1. Field and rotor assemblies are mounted on the shaft
a taperlock bushing. Insert the bushing into the
tapered bore.
2. Loosely assemble the two locking screws between
the taperlock bushing and the rotor.
3. Insert the key into the shaft keyway. Prick punch the
end of the keyway to ensure that the key cannot
slide out.
4. Slide the rotor assembly onto the shaft over the key.
5. If the armature has been secured to the shaft first,
ad just the rotor's position to allow a 1/32-inch gap
be tween the two faces. (See Figure 8.)
6. Lock the assembly into place by alternately
tight en ing the two locking screws.
7. A tab or torque arm on the field is used to prevent
ro ta tion of the field caused by normal bearing drag.
In sert ei ther a pin in the U-slot or a fork around the
torque arm to prevent this rotation. Under no
cir cum stanc es, however, should the field be so
tightly re strained as to preload the bearing. (For
more in for ma tion on torque tabs, see page 5.)
D. Assembling the Armature and Hub
These units contain a spline drive armature and hub.
The armatures are shipped with a built-in autogap spring
ac ces so ry. This device automatically maintains a gap of
about 1/32" between the armature and rotor faces for
the life of the units.
These units are shipped with the armature, splined
ar ma ture adapter, and autogap already assembled. The
splined hub, retainer ring, and bushing are shipped as
separate parts.
Follow these instructions to assemble the splined
ar ma ture assembly and hub:
1. Place the armature assembly on a flat surface with
the segmented side up.
2. Push the splined hub, with the retainer ring groove
down, through the autogap spring and splined
armature adapt er (Figure 5). (Considerable force is
required to start the hub through the armature.)
3. Turn the armature assembly over, and insert the
retainer ring in the groove. (Figure 6)
4. Slide the armature assembly up against the retainer
ring.
Figure 5
Figure 6