Epson C Series Maintenance Manual page 85

If it is difficult to remove the flange, insert the bolts to two parts
as shown in the photo, and then tighten them evenly to remove
the flange.
Use the dedicated screws for fixing the flange.
Wipe grease from the parts while removing them.
7. Remove the O-ring.
8. Remove the wave generator unit from the reduction gear unit.
Wipe grease from the parts while removing them.
If it is difficult to remove the wave generator unit, install the
removed pulley 2 to the shaft and pull the parts together.
9. Remove the wave generator from the shaft.
Hexagon socket head set screws: 2-M5×6 (with a brass bushing)
At this point, remove the bearing first. The bearing will be
used again. Be careful not to lose it.
There is a brass bushing on one of the set screws. Be careful
not to lose it.
Wipe grease from the parts while removing them.
C Series Maintenance Manual Rev.2
C4 Maintenance 5. Joint #1
O-ring
65