Yamaha SIGMA-G5SII Service Information page 164

(11) Fill the ultrasonic cleaner with water and clean the nozzle shaft for about 15 minutes.
Also, the spring can be cleaned together with the nozzle shaft.
* Do not use any liquid other than water for the cleaning.
* Arrange and clean the nozzle shafts making sure that the combination with the
retainers does not change. Also, use the special jig so that these nozzle shafts do
not interfere with each other.
Reference: Nozzle Shaft Cleaning Jig
(12) After the cleaning, blow water away with air and further perform air blowing also
inside the nozzle shaft.
* Take care, in particular, not to leave any dirt or water inside the shaft cylinder.
There should no dirt or water left.
After that, apply grease (Daphne Eponex No. 1) on the specified locations (Refer to
the following figure) on the nozzle shaft using a finger so that a thin film of grease is
created. Also, apply grease into the grooves (2 lines) where the retainer is moved, so
that the grease amount as much as half size (0.03g) of a match head is applied in
each groove.
Do not apply grease around the hole.
Apply grease on the surface slightly.
Service Information
Groove where the retainer is moved
* Apply grease to the groove on the
opposite side.
* Apply grease into the cover to the rear
as far as possible.
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