Notes On Assembling The Bearing Seal; Assembling The Fan; Bolt Locking Devices And Tightening Torques; Spare Parts - Siemens 1LA8 Series Operating Instructions Manual

Pack two third of the bearing cavities with grease! The
outer bearing cover is kept free of grease to prevent
over greasing. The cavities in the outer bearing cover is
meant to collect spilled over / excess grease from the
bearing assembly.
In case of regreaseable bearings, also fill the grease
ducts in the end shield and the inner bearing cover.

6.3.5 Notes on assembling the bearing seal

V-ring with adjacent protecting ring
When assembling ensure that the seating on the
bearing cover for the V-ring is not greased, but that the
sealing surface is greased.
Disc used as fitting tool
ungreased
Re-assembly of the V-ring and adjacent protecting ring
The correct axial position of the V-ring has been reached
when the front of the bearing cap and the outer corner
of the V-ring are flush. The use of a suitable auxiliary
disc for assembly purposes is recommended.
To protect the V-ring against mechanical effects in
special cases there may be a sheet metal protecting
ring fitted in the outer bearing cap. During installation,
the protecting ring should be inserted in the centering
bore in such a way that one of its two slots coincides
with the water drainage slot provided at the low point
of its seat in the bearing cap or bearing shield.

6.3.6 Assembling the fan

Fans
Before mounting plastic radial fans on the shaft, make
sure that the two integrally molded tongues, which
provide axial location in the annular groove, are
undamaged.
Fan cowls
The fan cowl is made of sheet steel and welded
together. When installing the sheet steel fan cowls,
make sure that the retaining components are correctly
installed. In the case of unidirectional axial fans also
check the radial gap between the fan impeller and the
air guide nozzle (≥ 2mm).

6.3.7 Bolt locking devices and tightening torques

Bolt locking devices
Nuts or bolts that are mounted together with locking,
resilient and/or force distributing elements must be
refitted together with identical, fully functional
elements. Always renew positive-action locking
elements.
24
3.10
greased
Threads, which are secured with liquid plastic, must be
treated accordingly when they are tightened, e.g.
using Loctite 243. Fixing bolts with a clamping length
greater than 25 mm must be reinstalled using suitable
retaining elements or soluble locking compound (e.g.
Loctite). The clamping length is taken as the distance
between the head of the bolt and the point at which
the bolt is screwed in.
Tightening torques
The bolted connections with metal contact surfaces
(end shields, bearing cartridge parts, terminal box parts
bolted onto the stator frame) should be tightened to the
following torques, depending on the thread size.
Tightening torques (tolerance ± 10%)
M4 M5 M6 M8
A 1,2 2,5 4 8
B 1,3 2,6 4,5 10
C 3 5 8 20
The tightening torques in the different rows apply to
the following cases:
• Case A applies to electrical connections in which
the permissible tightening torque is normally
limited by the bolt materials and/or the load-
bearing capacity of the insulators (with the
exception of the bus bar connections in case B).
• Case B applies to bolts/screws of property class 5.6
(acc. to IS: 1367-Part 3 (ISO 898-1)) or to
bolts in components of lower strength (e.g.
aluminum).
• Case C applies to bolts/screws of property class 8.8
or A4-70 (acc. to IS: 1367-Part 3 (ISO 898-1)), but
only in screwed connections of higher strength
components (e.g. gray cast iron, steel or cast steel).
Please refer to the relevant sections and drawings for
all other tightening torques (electrical connections and
bolted connections for parts with flat gaskets).

6.3.8 Spare Parts

When ordering spare parts, please indicate the correct
Motor Type, Serial Number (as shown on the rating
plate) and also the correct part description. This will
ensure speedy and correct delivery of spare parts.
Please refer to the exploded view of the motor.
Caution
(Environmental Protection)
Disposal of the product at the end of its life:
When it is decided that the product cannot be
repaired and is to be disposed off, care should
be taken to adhere to Local / Statutory
environmental requirements. It should be noted
that the product contains grease, copper
windings, insulation materials that are not
biodegradable and are hazardous to the
environment.
M10 M12 M16 M20 M24
13 20 40 – –
20 34 83 160 280
40 70 170 340 600
Nm
Nm
Nm