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46 l Installation, Operation and Maintenance Manual – Synchronous Motors – S Line – Brushless – Horizontal 11866576
7.10.3 Sleeve bearings
7.10.3.1 Bearing data
The characteristic data, such as oil flow, quantity and
type, are indicated on the bearing nameplate and must be
strictly observed; otherwise, overheating and damages to
the bearings may occur.
The hydraulic installation (for bearings with forced
lubrication) and oil the supply for the motor bearings are
responsibilities of the user.
7.10.3.2 Bearing installation and operation
For information on the bill of materials, assembly and
disassembly instructions, and maintenance details, refer to
the specific installation and operation manual of the
bearings.
7.10.3.3 Cooling by water circulation
The sleeve bearings with cooling by water circulation have
a serpentine inside the oil tank through which the water
circulates.
In order to assure an efficient bearing cooling, the
circulating water must have at the bearing inlet a
temperature below or equal to the ambient, so that the
cooling takes place.
The water pressure must be 0.1 bar and the flow equal to
0.7 l/s. The pH must be neutral.
NOTE
Under no circumstances can water leak into
the oil tank, because this will contaminate the
lubricant.
7.10.3.4 Oil change
Self-lubricated bearings:
The bearing oil change must be done according to the
intervals, which depend on the bearing operating
temperatures, shown in Table 7.5:
Table 7.5: Oil change intervals
Bearing operating
temperature
Bearing oil change
intervals
Below 75 ºC 20,000 hours
Between 75 and 80 ºC 16,000 hours
Between 80 and 85 ºC 12,000 hours
Between 85 and 90 ºC 8,000 hours
Between 90 and 95 ºC 6,000 hours
Between 95 and 100 ºC 4,000 hours
Bearings with (external) oil circulation:
The oil of the bearings must be changed every 20,000
hours of operation or whenever the lubricant presents
modifications in its characteristics. The oil viscosity and pH
must be checked regularly.
NOTE
The oil level must be inspected daily, and it
must remain in the middle of the oil sight
glass.
The bearings must be lubricated with the specified oil,
observing the flow rate informed on their nameplate;
All threaded holes that are not used must be closed with
plugs and no fitting may present leaks.
The oil level is reached when the lubricant can be seen
approximately in the middle of the sight glass. The use of
a larger amount of oil will not damage the bearing; but it
can cause leaks through the shaft seals.
TTENTION
The care with the lubrication will determine
the useful life of the bearings and the safety in
the motor operation. Therefore, the following
recommendations must be observed:
The selected lubricant oil must be the one
with proper viscosity for the operating
temperature of the bearings. That must be
observed at every oil change or periodical
maintenances;
Never use or mix hydraulic oil with the
lubricant oil of the bearings;
Lack of lubricant, due to incomplete filling
or non-monitoring of the level, can damage
the bearing shells;
The minimum oil level is reached when the
lubricant can be seen in the lower part of
the sight glass with the motor stopped.
7.10.3.5 Sealings
Make visual inspection of the sealings, making sure that
the dragging marks of the seals on the shaft do not
compromise its integrity and 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 (e.g.: 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.
TTENTION
For further information on the disassembly
and assembly of sleeve bearing seals, refer to
the specific manual of this equipment.
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