Bearing Replacement; Lubrication - ITALVIBRAS GIORGIO SILINGARDI MVSI Serie Guide Technique

5.0 BEARING REPLACEMENT

We recommend to replace both bearings even if one bearing only is
defective, normally the other bearing would fail in a short time.
During the repairing check the conditions of all parts, replace them
if necessary.
Switch-off the power supply from the vibrator, dismount it from the
machine, remove the weight covers and the OR seals (fig.37, page
11), mark position of eccentric weights and disassemble them (fig.38,
page 11) with keys.
5.0.1 Frame sizes 00-01-10-AF10-20-30 & 35-40-50 (6,8,10,12 poles)
These vibrators have ball and shielded bearings that are pre-lubri-
cated for life.
Remove the two seeger rings mounted on the flanges near to the
bearings (in frame sizes 35-40-50 there aren't seegers). Press the
shaft from one side (Fig.34, page 10). The shaft will drag at one
bearing while one remains in its flange. Remove the bearing from
the shaft and remove the other bearing from the flange. Check the
bearing seats in the flange and in the shaft. If they are worn the motor
group or the shaft must be replaced.
Take new original ball bearings.
Press the first new bearing in a flange paying attention that it remains
just beyond the seat of the seeger ring, then mount the seeger ring.
ATTENTION: the shaft is not simmetrical: in one side the bearing seat
diameter is bigger than the other side. In the bigger seat the bearing
has to be pressed into it, in the other seat the bearing enter free.
Press mount the second new bearing in the bigger seat (Fig.35,
page 10).
Introduce the shaft with the second bearing into the motor group
(Fig.36, page 10) and press until shaft is in its final position. Assemble
the second seeger ring on the flange. Install the eccentric weights
with keys adjusting in the marked position, mount seals and weight
covers. Turn the shaft manually to ensure that it turns freely without
axial play.
5.0.2 Frame sizes AF30-AF33 & 35-40-50 (2,4 poles) ... up to frame 120
These vibrators have roller bearings, already lubricated in the factory
by ITALVIBRAS.
The roller bearing is composed by an inner ring on the shaft and
an outer part (outer bearing) in the flange. For frame sizes 105, 110
and 120 remove the labyrinth seals on the shaft (fig.39, page 11).
Remove a flange from the casing using the 2 threaded extraction
holes (Fig.40, page 11). Pull out the shaft (fig.41, page 11) and than
extract the second flange in the same way of the other. In each flange
extract the snap ring and push out outer bearing and bearing cover
through the bearing extraction holes (Fig.42, page 11).
Type MVSI 10/13000-S02, frame sizes 110 and 120 have no snap
ring, but 4-6 fixing screws.
Remove both inner bearings from the shaft using an extractor (Fig.43,
page 11). Clean all pieces removing old grease. Check the bearing
seat in the flange and in the shaft. If flange and/or shaft are worn
replace them. Heat the new inner rings and place them on the shaft,
push the outer bearings into the flanges with the bearing cover and
snap ring or screws.
On re-mounting the bearings (inner and outer parts) pay attention
that they rest correctly on the stroke of their seat.
Apply the new grease (see type in paragraph 5.1) in the quantity
prescribed in the «Technical Features» table (page 94-102) spreading
deeply inside the bearing applying pressure to allow penetration of
the grease into the rolling parts. Half fill the chamber between the
bearing cover and the bearing with grease.
ATTENTION: avoid grease contaminations, external particles
may strongly reduce the bearing life.
Place some grease on the flange diameter and some on the casing
diameter to make easier the flange assembling. Place some grease
also on the bearing inner rings.
Introduce the first flange in the casing, using a press or by using
fixing threads with longer screws. Keep the flange orthogonal to
the casing.
Introduce the shaft into the casing with paying attention not to touch
the wounded stator.
ENGLISH
Introduce the second flange into the casing, by keeping the
flange orthogonal to the shaft, otherwise the roller bearing could
be damaged (Fig. 39, page 11).
For frame sizes 105, 110 and 120, assemble the labyrinth seals
by means of LOCTITE 200M to fix it on the shaft.
Complete the assembling of the eccentric weights with keys adju-
sting in the marked position, mount seals and weight covers.
Pay attention that the seals are correctly positioned in their
seats. Control the state of the seals during this operation and
replace them if necessary.
Turn the shaft manually and ensure that it has axial play between
0.5 and 1.5 mm.
ATTENTION: Every time the afore-mentioned maintenance ope-
rations are carried out it is recommended that all disassembled
screws and spring washers are replaced and that the screws
are tightened using a dynamometric wrench.

5.1 LUBRICATION

All bearings are correctly lubricated on mounting the vibrator.
Vibrators with spherical ball bearings (bearing type indicated from
page 94 for each vibrator type) are lubricated for life.
For vibrators with roller bearings the user can choose between
two possible alternatives:
- do not relubricate (FOR-LIFE system): choice advisable only in presence
of low duty conditions or in cases where the re-lubrication is impossible,
too expensive or unreliable;
- re-lubricate through the two external greasers (grease zerks UNI7663A,
DIN71412A), with the following grease type:
● 3000 rpm or higher: KLUEBER type ISOFLEX NBU 15;
● 1800 rpm or lower: KLUEBER type STABURAGS NBU 8 EP.
From a technical point of view, the best solution to obtain maximum
bearing life time is to periodically re-lubricate with original grease
in the recommended quantities and interval times. Remember that
excessive lubrication can result in temperature increases and early
aging of the grease.
Indicatively, the recommended re-lubrication times can be as fol-
lows:
- for ambient temperature Ta≤+20°C (average air temperature in the close
proximity of the vibrator) it is advisable to apply periodic re-lubrication
according to quantity and interval time as indicated in the tables on page
94.
- for ambient temperature Ta +20°C<Ta≤+30°C, it is recommended to apply
the periodic re-lubrication according to the quantities indicated in the tables
on page 94, but with a reduced interval time (x0.65).
- for ambient temperature Ta +30°C<Ta≤+40°C, it is recommended to apply
periodic re-lubrication according to the quantities indicated in the tables
on page 94 but with a reduced interval time (x0.5).
Example:
MVSI 15/3810-S02 50Hz with Ta=+20°C: re-lubrication with 26gr.
every 4000 hours.
MVSI 15/3810-S02 50Hz with Ta=+30°C: re-lubrication with 26gr.
every 2600 hours (4000x0.65).
MVSI 15/3810-S02 50Hz with Ta=+40°C: re-lubrication with 26gr.
every 2000 hours (4000x0.5).
The proposed re-lubrication interval times are only indicative,
results from theoretical calculations under specific medium
conditions and are not said to be suitable for any type of appli-
cation, as there are several variables to be considered.
Italvibras is therefore available to provide recommendations on
the best lubrication for each type of application.
It is advised to contact ITALVIBRAS for particular uses which is at
complete disposal to advise the client on the best lubrication possible
for the specific use.

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