NSK PRESTO AQUA LUX Manuel Technique page 10

7. Replacement or Cleaning Procedures of Chuck
( 1 ) Removal of Chuck
1 ) Remove the cartridge with a bur or bur blank.
2 ) Hold the rotor with two fingers. (Fig.18)
Mount the Wrench provided on the Rotor Nut located
on the top of the rotor shaft and turn counterclockwise
( either side of the wrench can be used. )
3) When the Rotor Nut is loose, push out the chuck
carefully with the Test Bur or the shank of the bur from
the back of the cartridge, the Guide Bush and the
chuck will come out. ( Fig. 19 )
CAUTION
The Guide Bush is a very small part and can easily be lost. Please pay attention.
NOTICE
Remove the chuck and clean once a week.
( 2 ) Chuck assembly or replacement
1 ) Apply oil thinly on the surface of the chuck, insert the Test Bur and push into the rotor shaft. ( Fig.20 )
2 ) Insert straight long side of Guide Bush toward the
Cartridge side. ( Fig. 21 )
3 ) Finally insert the Rotor Nut along the Test Bur and
firmly tighten it with the Chuck Wrench while holding
the rotor. ( Fig.22 )
Rotor
Test Bur
Guide Bush Guide Bush
Fig. 21
9
Rotor Nut
Chuck
Fig. 18
Guide Bush
Fig. 19
Test Bur Test Bur
Fig. 20
Fig. 22