7 Servicing/Maintenance
36 of 64
MK
1
2
3
4
Fig. 8:
Radial ball bearing (thrust and radial bearing)
1
Radial ball bearing
2
Washer
3
Grease fill
4
Nilos ring
Table 10:
Bearings used
Sizes
Motor
Radial ball bearing
Nilos ring
MK, MKA 20-1 to 5
80 M
6006 2 RS
ZJV 6006
MK, MKA 20-6
90 S, L
6008 2 RS
ZJV 6008
MKY 20-1 to 4
80 M
6006 2 RS
ZJV 6006
MKY 20-5 and 6
90 S, L
6008 2 RS
ZJV 6008
Grease quality
▪
High-performance lithium soap grease to DIN 51825
▪
Free of resin and acid
▪
Not liable to crumble
▪
With good rust-preventive characteristics
Bearing life
With this grease, a theoretical bearing life Lh10 of 25,000 h at an operating
temperature of 75 °C can be achieved. If temperatures are higher, grease life will be
reduced. A temperature increase of 15 K will reduce grease life by half. However,
bearing life may be reduced by vibrations, aggressive gases, humidity, etc.
7.2.2.2 Lubrication of bearing bushes
DANGER
Excessive temperatures as a result of bearing bushes running hot
Explosion hazard!
Fire hazard!
Damage to the pump set!
▷
Make sure the bearing bushes are properly lubricated.
▷
Regularly check the bearing bushes for correct lubrication.
The bearing bushes (radial bearings) in the support column and volute casing are
lubricated by the fluid handled. Bearings must be checked for wear in the following
cases:
▪
When the pump has been operated under dry-running or cavitation conditions
▪
When vibrations, noise and an increase in current input occur during unchanged
operating conditions
Internal lubrication by fluid handled
Lubrication by the fluid handled is used for bearing bushes with a risk of dry running.
Connect pipe union 731.21 between the discharge pipe and the support column.
Содержание MK
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