28
AB-708
Disassembly
1. Remove unit from operation and pull off shaft
coupling hubs, or sheaves, with approved
bearing puller and remove shaft key(s)(1).
2. Remove junction box cover (2) from both end
bells by removing two machine screws and
lockwashers (3). Disconnect brake leads inside
of both junction boxes.
3. Remove four cap screws and lockwashers (4)
from each end bell. Slide both end bells (5) off
of bearings and shaft assembly.
4. To remove both field assemblies from housing
(6) match mark and remove the pins that hold
them in place. At least one field assembly must
be removed in order to remove the shaft
assembly. Slide entire shaft assembly out of
housing.
5. Using an approved bearing puller, remove
bearing (7) from each end of shaft (8). Force
should be applied only to the inner race when
removing bearings.
6. If necessary remove snap rings (9), fans (10)
and keys (11) from the shaft; heat hub of fan if
necessary.
7. Clean all pieces of grease and dirt before
reassembly.
Reassembly
1. If fans (10) were removed, install keys (11) into
shaft; heat hub of fans and press them over the
keys onto the shaft flush against shoulders of
the shaft. Install snap rings (9).
2. Press bearing (7) onto each end of shaft with
an approved pusher device. Apply pressure
only to the inner race until bearings are flush
against shoulders of the shaft.
3. Pack bearing cavity in both end bells with
recommended grease. Slide entire shaft
assembly into housing (6). Install field
assemblies into housing and secure with pins.
4. Slide both end bells (5) over bearing until flush
with housing (6).
5. Align holes in each end bell with holes in
housing and install four cap screws and
lockwashers (4). Rotate shaft to ensure that no
binding exists.
6. Replace key(s)(1), connect brake leads in
junction boxes and replace covers. Brake is
ready for return to operation.
