Schaeffler YRTC - Delivered Condition of the Bearings; Initial Greasing; Bearing Storage and Storage Life

8 MON 100 Schaeffler Technologies
High precision bearings for combined loads
Delivered condition of
the bearings
The bearings are wrapped in anti-corrosion paper and individually
packed in film. Smaller sizes are also supplied in multiple packs.
Initial greasing The bearings are greased:
■ YRTS, YRTSM and YRTSMA with
a lubricating grease according to Arcanol L
OAD 150
■ YRTC, YRTCM, YRTCMA, YRTCMI and ZKLDF with
a lubricating grease according to Arcanol M
ULTITOP
The rotational resistance is heavily dependent on the greasing of
the bearing. The frictional torque values given in
the dimension tables (Catalogue HR 1, Rolling Bearings, and
TPI 120, High Precision Bearings for Combined Loads)
are only valid for bearings with the original greasing.
Miscibility of greases Greases may be mixed if the following preconditions are fulfilled:
■ same base oil
■ compatible thickener type
■ similar base oil viscosities
(differing by no more than one ISO viscosity grade VG)
■ matching consistency
(NLGI consistency class)
If there is any doubt, please consult the lubricant manufacturer.
Bearing storage and
storage life
The shelf life of the bearings is limited by the storage life of
the grease.
Experience shows that the greases used, with a mineral oil base,
can be stored for up to 3 years under the following conditions:
■ closed room
■ dry, clean rooms with temperatures between 0 °C and +40 °C
■ relative humidity up to a maximum of 65%
■ no influence of chemical agents
(vapours, gases, fluids)
After long storage periods, the frictional torque may temporarily
be higher than that of freshly greased bearings. The lubricity of
the grease may also have deteriorated.