NSK PRESTO II Mode D'emploi page 7

2) When the rotor nut is loose. Push out the chuck
carefully with a dummy bur or the shank of bur from
the back of the cartridge, the Guide-bush and the
chuck will come out. (Fig.12)
CAUTION
As the guide-bush is a very small part, be careful not to lose it.
• When cleaning the chuck, clean it sufficiently with ultrasonic cleaner etc. Blow oil spray to the inside of the rotor shaft
and clean thoroughly.
NOTICE
Remove the chuck and clean once a week.
7-2 Installation of the New Chuck
1) Apply oil thinly on the surface of the new chuck or the chuck after cleaning, insert the test bur and push into the rotor
shaft. (Fig.13)
2) Set the longer one of the guides of the guide bush on
the end of the rotor shaft first along the test bur.
(Fig.14)
3) Finally insert the rotor shaft nut along the test bur, and
firmly tighten it with a wrench while holding the rotor.
(Fig.15)
8. Maintenance of Unit
8-1 Draining the Filter
Check the filter bowl from the filter inspection window,
and if there is an accumulation of water, insert fingers
from the bottom, and turn the drain cock in the direction
of the arrow (counterclockwise) to drain water from the
filter. (Fig. 16) After draining, securely tighten the drain
cock by turning it in the reverse direction.
Guide-bush
Fig.14
6
Test Bur Chuck
Test Bur
Guide-bush
Fig.12
Test bur
Chuck
Fig.13
Rotor Shaft Nut
Fig.15
Fig.16