Motor Assembly - MIRKA ROS325NV Notice D'utilisation

the Spindle shaft and Bearing. See Figure 4. Note: When the
Spindle Assembly is done correctly, the Bearings will rotate
freely but not loosely and the Shim can be moved but will not
slide or move by gravity.
4. Snap the (17) Retaining Ring onto the (24) Spindle Assembly
making sure it is completely snapped into the groove. Set the
Spindle Assembly aside.
5. Take the (14) Filter and center it on the small bore that the
original Filter was in before removal. With a small diameter
screwdriver or flat end rod, press the Filter into the bore until
it is flat in the bottom of the bore. Place the (17) Valve into the
bore so it is oriented correctly, then press the (16) Retainer
into the bore until it is lightly seated against the Valve.
6. Apply a pin head size drop of #271 Loctite® or equivalent to
the outside diameter of each of the bearings on the Spindle
Assembly. Spread the drop of bearing locker around both
bearings until distributed evenly. Caution: Only a very small
amount of bearing locker is needed to prevent rotation of the
bearing OD. Any excess will make future removal difficult.
Place the Spindle Assembly into the bore of the (13) Shaft
Balancer and secure with the (23) Retaining Ring. Caution:
Make sure that the Retaining Ring is completely snapped into
the groove in the Shaft Balancer. Allow the adhesive to cure.

Motor Assembly:

1. Use the larger end of the T-13 Bearing Press Sleeve to Press
the front (10) Bearing (with 2 Shields) onto the shaft of the (13)
Shaft Balancer.
2. Slide the (9) Front Endplate with the bearing pocket facing
down onto the Motor Shaft. Gently press the Front Endplate onto
the (10) Bearing using the larger end of the T-13 Bearing Press
Sleeve until the front Bearing is seated in the bearing pocket of
the Front Endplate. CAUTION: Only press just enough to seat the
Bearing into the pocket. Over-pressing can damage the bearing.
3. Place the (8) Key into the groove on the (13) Shaft Balancer.
Place the (6) Rotor onto the shaft of the Shaft Balancer, making
sure that it is a tight slip fit.
4. Oil the five (7) Vanes with a quality pneumatic tool oil and place
in the slots in the (6) Rotor. Place the (4) Cylinder Assembly over
the Rotor with the shorter end of the Spring Pin engaging the blind
hole in the (9) Front Endplate. Note: The Spring Pin must project
1.5 mm (.060 in.) above the flanged side of the Cylinder.
DOC A0329
5. Press fit the rear (2) Bearing (2 shields) into the (3) Rear
Endplate with the T-1B Bearing Press Tool (not shown). Make
sure the T 1B Press Tool is centered on the O.D. of the outer race.
Lightly press fit the Rear Endplate and Bearing Assembly over
the (13) Shaft Balancer using the small end of the T-13 Bearing
Press Sleeve. The sleeve should press only the inner race of the
bearing. Important: The Rear Endplate and Bearing Assembly
is pressed correctly when the Cylinder is squeezed just enough
between the Endplates to stop it from moving freely under its
own weight when the shaft is held horizontal, but be able to slide
between the Endplates with a very light force. If pressed to tightly
the motor will not run freely. If the pressed assembly is to loose,
the motor will not turn freely after assembly in the (29) Housing.
6. Secure the assembly by placing the (1) Retaining Ring in the
groove of the (13) Shaft Balancer. Caution: The Retaining Ring
must be placed so that the middle and two ends of the hoop touch
the (2) Bearing first. Both raised center portions must be securely
"snapped" into the groove in the (13) Shaft Balancer by pushing
on the curved portions with a small screwdriver.
7. Carefully screw the (12) Lock Ring into the (29) Housing using
the (MPA0025) T-6 Motor Lock Ring Wrench. See "Parts Page"
for torque settings. Note: A simple technique to assure first thread
engagement is to turn the Lock Ring counter clockwise with the
service tool while applying light pressure. You will hear and feel
a click when the lead thread of the Lock Ring drops into the lead
thread of the housing, then turn clockwise to tighten
8. Spin on a new (37) Pad and hand tighten it using a (36) 17 mm
Pad Wrench.
Testing:
Place 3 drops of quality pneumatic air tool oil directly into the
motor inlet and connect to a 6.2 bar (90 psig) air supply. The
tool should run between 11,500 and 12,500 RPM when the air
pressure is 6.2 bar (90 psig) at the inlet of the tool while the tool
is running at free speed. This free speed will be about 500 RPM
to 1,000 RPM less when a Vacuum or Hook Face Pad is used
because of wind resistance. This will not affect performance when
sanding.
* Loctite® is a registered trademark of the Loctite Corp.
10
REV 04/03/07