EN - 17
EN
2) Constant lubrication
Bearings equipped with grease valves
In some cases, the lubrication frequencies indicated in the chart will be too short as they will result in:
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Either costly and time-consuming excessively frequent shutdowns for cleaning and lubrication;
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Or flooding of the bearing housings if fresh lubricant is added without first turning off the machine and removing the used lubricant.
To avoid this, SFK has developed a mechanism, known as a GREASE VALVE, that automatically drains used or excess lubricant.
The GREASE VALVE is particularly useful in the case of machines that operate continuously or bearings that are hard to access or subjected to high temperatures.
Constant lubrication eliminates the need to shut down the machine for lubrication and thus helps to reduce running costs.
Assembly
a) SHAFT TOLERANCE
For correct assembly, clean the shaft thoroughly and slide the sleeve, bearing, lock washer and nut on it. Place the nut such that it is tightened in the opposite direction of the
rotation of the shaft. For easier sliding of the sleeve along the shaft, open the slot with a screwdriver. The teeth of the lock washer must be facing outward and the chamfered
side of the nut must be facing the bearing.
Tighten the bearing to its sleeve with the nut. Check by observing the smoothness of rotation and the ease with which the outer race tilts. The onset of tilt resistance indicates
sufficient insertion.
The shaft should still turn easily at this point.
Tighten the nut by pushing down the lock washer tooth closest to the slot. If the tooth and slot do not quite match up, retighten (do not loosen) the nut slightly until they do.
b) HOUSINGS
Ensure that bearing housings are CLEAN AND OILED to prevent the formation of rust which could jam the free outer ball race.
c) QUANTITY OF LUBRICANT
If the bearing must be packed with lubricant during assembly, do not fill it more than two-thirds full. Excess lubricant could cause the bearing to overheat.
To ensure that the lubricant helps to create a seal, coat all the walls of the bearing (for further details, refer to the section on lubrication on the preceding page).
d) FITTING THE CAP
The bearing housing was machined following assembly of the bearing base and cap.
When installing the bearing, the base and cap must be assembled in the same manner. To ensure this, mark both parts when disassembling them. Do not place the cap of one
bearing on the base of another.
Adjusting the cone on the backward-curved fan
To adjust the cone, slightly tighten the screws on the suction wall then centre it by giving it a series of light taps.
Once it is correctly centred, lock it in place by tightening the screws on the suction wall.
