Xylem EXO Series User Manual page 108

Retaining Locking Nut
Ring
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108
pg
4 Replace locking nut.
If the locking nut near the sensor connector wears out,
users can replace it with #599478 (sensor) or #599479
(EXO2 central wiper).
First remove the retaining ring by inserting the tip of a
small, flat-blade screwdriver under the lip of the ring and
pry upward. Pull ring out of groove.
Remove locking nut and replace with new locking nut.
Install new locking ring by prying up one edge with
screwdriver and fitting it into groove. Use the screwdriver
to follow the diameter of the ring around the groove to seat
it fully
A
Wear eye protection when servicing the locking ring.