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46 l Installation, operation and maintenance manual – Squirrel cage motor – M line – Vertical 11371757
7.9.4.5
Sealing
Make visual inspections of the sealing, making sure that
the dragging marks of the seal on the shaft do not
compromise its integrity, checking for cracks and broken
parts. Cracked or broken parts must be replaced.
In case of bearing maintenance, in order to assemble the
seal, it is necessary to carefully clean the seal contact
surfaces and its enclosure, and cover the sealing with a
non-hardening component (i.e.
Curil T
). The two halves of
the labyrinth taconite seal must be joined by a garter
spring.
The drain holes located in the lower half of the seal must
be cleaned and unobstructed.
Improper installation can damage the sealing and cause oil
leakage.
For further information about the dismounting
and mounting of sleeve bearing seals, refer to
the specific manual of this equipment.
7.9.4.6
Sleeve bearing operation
The system start, as well as the first hours of
operation, must be monitored carefully.
Before starting, check:
If the oil inlet and outlet tubes (if any) are, clean. Clean
the tubes by pickling, if necessary;
If the used oil complies with the specification on the
nameplate;
The lubricant characteristics;
The oil level;
The alarm and trip temperatures set for the bearing.
During the first start, it is necessary to stay alert for
unusual vibrations or noises. If the bearing does not
operate in a silent and smooth way, the motor must be
shut down immediately.
The motor must operate for several hours until the bearing
temperatures stabilize. In case of overheating of the
bearings, the motor must be shut down for inspection of
the bearings and temperature sensors.
Check if there is no oil leak through the plugs, gaskets or
shaft end.
7.9.4.7
Sleeve bearing maintenance
The sleeve bearing maintenance includes:
Periodic checking of the oil level and its lubricating
conditions;
Checking the bearing noise and vibration levels;
Monitoring of the operating temperatures and
retightening of the fastening and mounting screws;
In order to facilitate the heat exchange with the
environment, the frame must be kept clean, without
external dust or oil accumulation;
The NDE bearing is electrically insulated. The spherical
seat surfaces of the bearing shell on the frame are
covered with insulating material. Never remove this
cover;
The anti-rotation pin is also insulated, and the sea
ls are
made of non-conducting material;
Temperature control devices that are in contact with
the
bearing shell must also be properly insulated.
7.9.4.8
Bearing disassembly and assembly
NOTE
If the supplied bearings are manufactured by
WEG, refer to the specific bearing manual
supplied with the motor, containing the
assembly, disassembly and maintenance
information.
7.9.4.8.1
Thrust bearing (upper)
The upper thrust bearing function is to withstand the
weight of the motor and the axial thrust for which it was
designed. Its main elements are the stationary axial pads
and the rotating pivots (see Figure 7.9).
The pivots receive the load through the thrust pads.
Figure 7.9: Upper thrust bearing
Figure 7.9 legend:
1.
Lower flange
2.
Base ring of the pads
3.
Axial segment
4.
Axial pad
5.
Bearing housing
6.
Serpentine (optional)
7.
Fittings for cooling water
8.
Stand pipe
9.
Runner
10.
Bearing shell
11.
Bearing cover
12.
Vertical guide plate
13.
Seal box
14.
Seal fastening ring
15.
Floating seal
Before disassembling:
Support the rotor at the shaft end with a hydraulic jack;
Drain the oil thoroughly from the bearing;
Clean the external part of the bearing thoroughly;
Remove the temperature sensors.
Disassembly
Support the rotor at the shaft end with a hydraulic jack;
Remove the screws that fix the bearing upper cover and
remove it;
Disassemble the bearing following the manufacturer
manual instruction.
Assembly
I
n order to assemble the bearing, follow the disassembly
procedures in the reverse order.
1
5
6
11
3
12 2
4
8
7
13
14
10 9
15
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