Main Service; Repair; Preparations For Overhauling / Repairs; Dismantling - Siemens 1LA8 Series Operating Instructions Manual

– The permissible bearing temperatures are not
exceeded.
– The smooth running characteristics and motor
noise in operation have not deteriorated.
• Check, while the motor is at standstill, that:
– The motor foundation has no indentations or
cracks.
Further checks may be required in addition as a result
of additional operating instructions or in accordance
with the plant-specific conditions. Any impermissible
discrepancies or changes found during the checks
must be rectified immediately.

6.2.3 Main service

Service criteria
After approximately 16 000 operating hours, at the
latest after 2 years
• Check, while the motor is running, that:
– The equipment conforms to the stated electrical
characteristics.
– The permissible bearing temperatures are not
exceeded.
– The smooth running characteristics and motor
noise in operation have not deteriorated.
• Check, while the motor is at standstill, that:
– The motor foundation has no indentations or
cracks.
– The motor is aligned within the permissible
tolerance ranges.
– All of the mounting bolts for the mechanical and
electrical connections are tight.
– The winding insulation resistances are
sufficiently high.
– If the bearings are insulated, the insulation has
not been bridged.
– Cables and insulating parts and components are
in a good condition and are not discolored.

6.3 Repair

6.3.1 Preparations for overhauling / repairs

Instruction relevant for safety
Note
If the motor has to be transported, please observe the
information and instructions in the section entitled
"Transport, storage".
22
Caution
(Environmental Protection)
Waste Copper windings during repair and
maintenance - to be collected as segregated
waste and sent to registered recyclers approved
by the respective State Pollution Control Board.
Waste insulation material is a hazardous waste
and it should only be incinerated at an
authorized agency and not disposed by any
other means.

6.3.2 Dismantling

Overview
The drawings and part lists do not include any detailed
data about the type and dimensions of the fixing
elements, etc.; thus, when you dismantle the motor,
you should make a note of where the parts belong and
mark them so that they can be easily re-assembled.
Use pullers or suitable devices to disassemble parts
and components attached to the motor shaft. Before
you pull-off screwed parts and components, replace
two of the fixing screws in the top of the parts to be
removed by long bolts or stud bolts, so that the parts
are still supported after they have been removed.

6.3.3 Dismantling instructions

Pressing on and pulling off drive elements
Use the tapped hole provided in the end of the shaft
for fitting drive components such as couplings,
gearwheels, belt pulleys etc. and, if possible, heat the
components as necessary. Use a suitable puller tool for
removing the components. Do not strike the
components, e.g. with a hammer or similar tool, when
fitting or removing them and do not exert more than
the maximum value of radial or axial force – according
to the catalog – transmitted to the motor bearings
through the shaft extension.
Fans
Radial fan impellers of plastic have two integrally
molded tongues, which engage with the
circumferential groove of the shaft to provide axial
fixing. Before pulling the impeller these tongues must
be disengaged and provisionally arrested in the raised
position, e.g. by means of inserted shim plates. The
fan discs each have two openings for the insertion of
a pull-off device, which should be applied so as to act
on the hub. Always use the appropriate tool for
pulling fan impellers. The use of a hammer is not
permissible.
Cast iron fans are axial locked with separate circlip.
Cast iron fans are best removed by engaging the
puller arms on the outer rim of the fan. In case of
larger fans, the puller holes provided on the hub can
be used.