Page 50 - Y-bearing-units

Lubrication and

maintenance

Grease fills Relubrication

S tandard SKF Y-bearings and Y-bearing units Relubrication of Y-bearing units is not required if:
are filled with a high-quality, long-lasting min-
eral oil based grease that has a lithium-calcium • loads and speeds are moderate
thickener. This grease has a consistency of 2 on • vibration does not occur
the NLGI scale. This grease is extremely water • operating temperatures are between 40 and
resistant and will provide long service life even 55 °C
under heavy loads. The properties of this grease
are listed in table 1. Y-bearing units with a pressed steel housing
YAR 2-2RF/HV series Y-bearings made of are not equipped with a grease fitting and there-
stainless steel and YAR 2-2RF/VE495 series fore cannot be relubricated.
Y-bearings with zinc coated rings and stainless Relubrication will enable the bearing to realize
steel flingers are filled with a special food-grade maximum service life in cases and applications
grease. This grease fulfils the requirements listed where Y-bearings or Y-bearing units:
in the Guidelines of section 21 CFR 178.3570 of
the FDA (US Food and Drug Administration) • are exposed to high humidity or severe
regulations. It is approved by the USDA (United contamination
States Department of Agriculture) for Category • have to accommodate heavy loads
H1 use (occasional contact with food stuffs). This • have to operate at high speeds or at tempera-
food-grade grease shows very good rust inhibit- tures above 55 °C for extended periods
ing properties, good water resistance and anti-
wear characteristics as well as high ageing and When relubricating, grease should be pumped
oxidation resistance. The properties of this slowly into the running bearing until fresh grease
grease are listed in table 1. starts to escape from the seal.
Y-bearings with a square or hexagonal bore NOTE: Excessive pressure from pumping too
are filled with a premium quality grease, which quickly may damage the seals.
has good water and corrosion resistant proper- Detailed information about SKF bearing
ties and provides excellent lubrication at high greases can be found in the catalogue MP3000
operating temperatures (designation suffix SKF Maintenance and Lubrication Products or
VT357). The properties of this grease are listed online at www.skf.com.
in table 1.

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