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<strong>Timken</strong> ® SAF SPLIT-BLOCK HOUSED UNITS<br />
Engineering • GREASE LUBRICATIONS FOR BEARING/HOUSING ASSEMBLIES • GENERAL-PURPOSE INDUSTRIAL GREASE<br />
Application Considerations<br />
For higher-speed applications (operating at 75 percent of the<br />
grease speed rating or more), a grease with a lighter base oil<br />
viscosity (ISO 100-150) can be considered. Conversely, for lowerspeed<br />
applications, a grease with a heavier base oil viscosity<br />
(ISO 320-460) can be considered. For lower-speed applications<br />
operating at colder start-up temperatures (>-18° C [0° F]), consider<br />
a softer grease (NLGI grade 1) with an approved EP additive. The<br />
lighter grade will allow more grease flow into the bearing contact<br />
area and the EP additive will reduce wear during start-up. An ISO<br />
460 base oil viscosity also can be considered.<br />
When lower-speed applications operate at higher temperatures<br />
(>149° C [300° F]), consult a local <strong>Timken</strong> engineer.<br />
Grease Fill<br />
For normal industrial applications, fill the bearing void to 100<br />
percent full and the housing void to 40 – 60 percent full. For<br />
high-speed applications, fill the bearing void to 100 percent full<br />
and the housing void to 30 – 40 percent full. The free volume of<br />
the bearing can be estimated by first calculating the solid ring<br />
volume of the bearing. Then, weigh the bearing and divide the<br />
weight by the density of steel. This actual volume can then be<br />
subtracted from the solid ring volume. The resultant value is an<br />
estimate of the free volume of the bearing available for grease<br />
fill. When the grease volume is determined for the application,<br />
multiplying this value by the density of the grease will yield the<br />
approximate weight of the grease fill. After weighing the grease<br />
required, apply approximately 75 percent of the amount into the<br />
cage and roller assembly. The remaining amount of grease should<br />
then be applied to both inner and outer rings in equal amounts.<br />
The preservatives applied to bearing components are compatible<br />
with nearly all industrial greases and should not be wiped or<br />
cleaned prior to packing the bearing. If in doubt, contact a local<br />
<strong>Timken</strong> engineer.<br />
D-34 TIMKEN ® HOUSED UNIT CATALOG
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