MIRKA MR-38CV Notice D'utilisation page 11

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 (24) Retaining Ring. Caution:
Make sure that the Retaining Ring is completely snapped into
the groove in the Balancer Shaft. Allow the adhesive to cure.
Motor Assembly:
1. Place (71) Dust Shield onto (13) Shaft balancer.
2. Lightly grease the (11) O-Ring with a light mineral grease and
place it in the groove of the (12) Lock Ring, then place it on
the (13) Shaft Balancer with the O-Ring facing towards the
shaft of the balancer.
3. Slide the (9) Front Endplate with the bearing pocket facing
down onto the Shaft. Gently press the Front Endplate onto
the (10) Bearing using the larger end of the (MPA0494) T-13
Bearing Press Sleeve until the Front Bearing is seated in the
bearing pocket of the Endplate. CAUTION: Only press just
enough to seat the bearing into the pocket. Over-pressing
can damage the bearing.
4. Place the (8) Key into the groove on the (13) Shaft Balancer.
Place the (6) Rotor onto the shaft of the Shaft Balancer, mak-
ing sure that it is a tight slip fit.
5. Oil the five (7) Vanes with a quality pneumatic tool oil and
place in the slots in the (6) Rotor. Place the (5) Cylinder As-
sembly over the Rotor with the shorter end of the Spring Pin
engaging the blind hole in the (9) Front Endplate. Note: The
Pin must project 1.5 mm (.060 in.) above the flanged side of
the Cylinder.
6. Press fit the rear (2) Bearing (2 shields) into the (3) Rear
Endplate with the (MPA0195) T-1B Bearing Press Tool (not
shown). Make sure the (MPA0195) T 1B Press Tool is cen-
tered on the O.D. of the outer race. Lightly press fit the Rear
Endplate and Bearing over the (13) Shaft Balancer using the
small end of the (MPA0494) T-13 Bearing Press Sleeve. The
sleeve should press only the inner race of the bearing. Im-
portant: The Rear Endplate and Bearing is pressed correctly
when the (5) 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 the assembly is
pressed to tightly the motor will not run freely. If the pressed
assembly is to loose, the motor will not turn freely after as-
sembly in the (29) Housing. Secure the assembly by placing
the (1) Retaining Ring in the groove of the Shaft Balancer.
CAUTION: The Retaining Ring must be placed so that the
middle and two ends of the hoop touch the Bearing first. Both
raised center portions must be securely "snapped" into the
groove in the Shaft Balancer by pushing on the curved por-
tions with a small screwdriver.
7. Lightly grease the (4) O-Ring with a light mineral grease and
place in the air inlet of the (5) Cylinder Assembly.
DOC 2548
8. Lightly grease or oil the inside diameter of the (29) Housing,
line up the Pin with the marking on the Housing and slide the
Motor Assembly into the Housing. Make sure the Spring Pin
engages the pocket in Housing.
9. Carefully screw the (12) Lock Ring with the (11) O-Ring
facing the (9) Front Endplate into the (29) Housing with the
(MPA0025) T-6 Motor Lock Ring Wrench/Spindle Puller Tool.
See the "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 ap-
plying 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. Place a (38 or 40)
Shroud on the exhaust side of the Housing, using the ring
of the Housing and groove in the Shroud to locate it. Add
the second (38 or 40) Shroud and secure it with the two (37)
Screws and the two (36) Threaded Inserts.
10. Place one of the (41) Pad Support Assemblies into the (29)
Housing with the 45 degree chamfer of the base facing
inward toward the center of the machine. Screw tight with
two (34) Screws and (35) Washers. See the "Parts Page"
for torque settings. Repeat for second pad support using the
other two Screws and Washers. Stretch the (39) Shroud Seal
back onto the shroud if applicable.
11. Using a straight edge placed across both bottom surfaces of
the (41) Pad Support Assemblies, measure the distance from
the surface of the (22) Spindle Assembly to the straight edge.
There should be approximately 0.25 mm (.010 in) of space,
if not add supplied (23 or 24) Spacers in the combination
that most closely results in 0.25 mm (.010 in.) of spacing.
Note: Spindle face must be slightly below Pad Supports for
best function. Do not over shim. Apply a small amount of
anti-seize compound in the 5-90° counter sunk holes of the
(41) Pad Backing before assembly. Place the Pad Backing by
orientating the Spacer(s) with the screw hole and placing the
pad backing down onto the Spindle Assembly making sure
the Pin goes through the Pad Backing. Add the (45) Screw
first and tighten firmly. In a circular rotation apply smaller (44)
Screws into the Pad Backing and Pad Support Assemblies
but leave them slightly loose until all are in place, and then
tighten firmly. See the "Parts Page" for torque settings.
12. Slide a new (46) Pad on the (41) Pad Backing and attach
with the four (42) Screws. See the "Parts Page" for torque
settings.
Testing:
Place 3 drops of quality pneumatic air tool oil directly into the mo-
tor inlet and connect it to a 6.2 Bar (90 psig) air supply. The tool
should run between 9,500 and 10,500 Orbits per Minute when the
air pressure is 6.2 Bar (90 psig) at the inlet of the tool while the
tool is running at free speed.
* LOCTITE® is a registered trademark of the Loctite Corp.
10
REV 07/13/11