Timken - Saf Split-Block Housed Units

Timken ® SAF SPLIT-BLOCK HOUSED UNITS
Engineering • GREASE LUBRICATIONS FOR BEARING/HOUSING ASSEMBLIES • GENERAL-PURPOSE INDUSTRIAL GREASE
GREASE LUBRICATIONS FOR
BEARING⁄HOUSING ASSEMBLIES
Polyurea and lithium-based greases are normally preferred for
general-purpose bearing lubrication and are advantageous
in high moisture applications. Both greases have good waterresistant
characteristics. For temperature ranges of standard
greases, see table D-16.
Frictional torque is influenced by the quantity and the quality of
lubricant present. Excessive quantities of grease cause churning.
The adverse effects of churn are accelerated with increases in
operating speed. The churn results in excessive temperatures,
separation of the grease components, and breakdown in
lubrication values. In normal-speed applications, the housings
should be kept approximately one-third to one-half full. Only in
low-speed applications may the housing be entirely filled with
grease. This method of lubrication is a safeguard against the
entry of foreign matter, where sealing provisions are inadequate
for exclusion of contaminants or moisture.
GENERAL-PURPOSE INDUSTRIAL
GREASE
Polyurea and and lithium-based greases are typical of greases
that can be used to lubricate many Timken bearing applications
in all types of standard equipment.
Special consideration should be given to applications where
speed, load, temperature or environmental conditions are
extreme.
Lithium greases, lithium complex greases, or calcium sulfonate
thickened grease are suitable for most centralized, single-point,
or manually lubricated product. They should be a smooth,
homogeneous and uniform, premium-quality product composed
of mineral or synthetic oil, a thickener and appropriate inhibitors
(see table D-18).
They should not contain materials that are corrosive or
abrasive to roller bearings. The grease should have excellent
mechanical and chemical stability. The grease should contain
inhibitors to provide long-term protection against oxidation in
high-performance applications and protect the bearings from
corrosion in the presence of moisture. The suggested base oil
viscosity covers a fairly wide range. Lower viscosity products
should be used in high-speed and/or lightly loaded applications
to minimize heat generation and torque. Higher viscosity products
should be used in moderate- to low-speed applications and
under heavy loads to maximize lubricant film thickness. Speed
ratings are listed for each size/class part number in the Spherical
Roller Bearing Catalog (order no. 10446) on pages 59-88. When
application speeds exceed 70 percent of grease speed rating,
consider increasing RIC by one ISO clearance range (CNormal
to C3). Table D-19 is provided as a reference for typical grease
thickener compatibilities. Consult your lubricant supplier for
further information for your specific requirement. For general
industrial applications, consider a grease that is NLGI No. 1 or
No. 2, with a ISO 150 to 220 viscosity grade.
Note
Mixing greases can result in improper bearing lubrication.
Always follow the specific lubrication instructions of
your equipment supplier.
Table D-18. Suggested Lithium Soap, Lithium Complex
and Calcium Sulfonate Grease Properties
Thickener type Lithium Complex, or equivalent
Consistency NLGI No.1 or No. 2
Additives
Anti-wear, corrosion and oxidation inhibitors
Base oil
Mineral oil or synthetic
Viscosity at 40° C ISO VG 150-220
Viscosity index 80 min.
Pour point
-18° C (0° F) max.
D-32 TIMKEN ® HOUSED UNIT CATALOG