Page 93 - Y-bearing-units

Cages Fig. 20
All standard Y-bearings are fitted with an injection
moulded snap-type cage of glass fibre reinforced
polyamide 66 († fig. 20). These cages exhibit
excellent performance characteristics in a variety
of applications where operating temperatures
do not exceed 120 °C.
The lubricants generally used for Y-bearings
do not have any detrimental effect on cage 2
properties.

Grease fills
All standard design SKF Y-bearings and Y-bearings
with a square bore are filled with a high quality,
long lasting grease containing a lithium-calcium
thickener with a consistency of 2 on the NLGI
scale.
Y-bearings made of stainless steel, in the
YAR 2-2RF/HV series, and Y-bearings with zinc-
coated rings, in the YAR 2-2RF/VE495 series,
meet the demands of food-processing machinery
in a corrosive environment. They are filled with
a non-toxic, food-grade grease based on a
synthetic hydrocarbon oil using an aluminium-
complex soap as a thickener.
Y-bearings with a hexagonal bore are filled
with a premium quality, mineral oil based grease
using a lithium-complex soap (designation suffix
VT357). The grease, which has a consistency of
3 on the NGLI scale, has good water and corrosion
resistant properties and provides excellent
lubrication at high operating temperatures.
For additional information about lubrication
and different lubricants, refer to the section
Lubrication and maintenance, starting
on page 48.

Mounting
The mounting procedures for Y-bearings depend
on the method used to attach the unit to the
shaft. The procedures are described in detail in
the section Mounting instructions, starting on
page 52.
Y-bearings with a standard inner ring are
mounted on the shaft with an interference fit.

91