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Table 11: Grease quality to DIN 51825
Soap basis
Lithium
7 Servicing/Maintenance
7.2.2 Inspection work
CAUTION
Excessive temperatures caused by friction, impact or frictional sparks
Damage to the pump set!
▷ Regularly check the coupling guard, plastic components and other guards of
rotating parts for deformation and sufficient distance from rotating parts.
7.2.2.1 Checking the coupling
Check the flexible elements of the coupling. Replace the relevant parts in due time if
there is any sign of wear and check the alignment.
7.2.2.2 Cleaning filters
CAUTION
Insufficient inlet pressure due to clogged filter in the suction line
Damage to the pump!
▷ Monitor contamination of filter with suitable means (e.g. differential pressure
gauge).
▷ Clean filter at appropriate intervals.
7.2.3 Lubrication and lubricant change of rolling element bearings
CAUTION
Excessive temperatures as a result of bearings running hot or defective bearing
seals
Damage to the pump set!
▷ Regularly check the condition of the lubricant.
7.2.3.1 Grease lubrication
The bearings are supplied packed with high-quality lithium-soap grease.
7.2.3.1.1 Intervals
Under normal conditions the grease-lubricated bearings will run for 15,000 operating
hours or 2 years. Under unfavourable operating conditions (e.g. high room
temperature, high atmospheric humidity, dust-laden air, aggressive industrial
atmosphere etc.), check the bearings earlier and clean and relubricate them if
required.
7.2.3.1.2 Grease quality
Optimum grease properties for rolling element bearings
NLGI grade
2 to 3
▪ Free of resin and acid
▪ Not liable to crumble
▪ Rust-preventive characteristics
Etanorm FXV
Worked penetration at
25° C in mm/10
220-295
Drop point
≥ 175 °C
35 of 62
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