Warner Electric SFPBC-500, SFPBC-650 - Manual (Page 18)

18 Warner Electric • 800-825-9050 P-202-01 • 819-0482
Torque Tabs
Clutches
Many Warner Electric clutch assemblies have a bearing
mounted stationary field. By design the bearing main -
tains its proper position between the field and rotor
mak ing it easy for the customer to mount the field-rotor
as sem bly. However, the bearing has a slight drag which
tends to make the field rotate with the rotor if not re -
strained. And, since the field has lead wires attached, it
must be restrained to prevent rotation and pulling of
these wires. To counteract this rotational force, the field
has a “torque tab” to which the customer must attach
an ap pro pri ate anti-rotational restraint.
A few hints regarding proper torque tab restraints are in
order. First and foremost, it is important to recognize that
the force to be overcome is very small and the tab
should not be restrained in any manner which will pre-
load the bearing. For example, if the clutch is mounted
with the back of the field adjacent to a rigid machine
member the customer should not attach a capscrew
tightly between the tab and the machine member. This
may pull the tab back against the rigid member as shown
in Figure 1 and preload the bearing. The recommended
methods are il lus trat ed in Figures 2, 3, and 4. The
method selected is primarily a matter of customer prefer-
ence or con ve nience.
Figure 1
Rigid Member
Figure 3
Pin in Hole
Loosely
Figure 2
Rigid Member
Straddling Tab
Figure 4
Flexible Strap