Warner Electric ER-1225 - Manual (Page 15)

Warner Electric • 800-825-9050 819-0466 15
Step 6: Place the armature hub assembly on a
flat surface with the armature working
face up . Push down on each detent cup
(Item 6) with your fingers, pushing the
armature down until the armature will not
move down any further . (See figure 19)
Figure 19 - Positioning the detent cups
in the armature
Step 7: Insert the taperlock bushing (Item 1) into
the hub (Item 2) . Align the two half-drilled
holes in the taperlock bushing with the
two half-threaded holes in the hub . Insert
two set screws (Item 12) into the aligned
holes and screw them in loosely to
maintain alignment during assembly .
During Steps 8, 9, and 10,
handle the armature/hub assembly by the
hub (Item 2) only, making sure the armature
(Item 3) is as close to the retainer ring (Item
10) as possible. Any movement of the
armature on the pins (Item 4) will reduce
available armature travel and may cause
improper air gap setting.
Keep fingers clear of the
area between the magnet (Item 11) and the
armature (Item 3) because the armature
will be pulled sharply toward the magnet
after the gap is closed to approximately 1/8
inch. Injury can result if fingers are pinched
between the armature and the magnet.
Step 8: Insert the key in the motor shaft key
way .
Step 9: Make sure no power is applied to
the brake. Place three steel shims 120
degrees apart on the magnet as shown
in Figure 20 .
.062 inch shims are
recommended. Do not use shims thicker than
.125 inch or you will shorten brake life by
reducing available armature travel.
Slip the armature hub assembly onto the motor
shaft until the armature makes contact with the
shims . Using a drift, lightly tap on the taperlock
bushing at several points around the
circumference with a small hammer until it will
not slide further onto the shaft . (See Figure 21)
Shims
Figure 20 - Armature installation with
shims in place.
Step 10: Using a torque wrench, tighten the hub
bushing screws (Item 12) alternately and
evenly until tight . Place a drift against
the large end of the bushing at several
points around the circumference and tap
it lightly with a small hammer . (See Figure
21) Repeat this alternate tapping and
re-tightening until the specified torque
no longer turns the screws after tapping .
Tighten the screws to 15 lb .ft . torque .
The gap between armature and magnet
must be .062 to .125 inch . If the gap
is outside of that range, reposition the
armature hub assembly as described in
Steps 11 & 12; otherwise, go to Step 13 .