Page 710 - SKF-bearing-housings

Inch roller bearing units SYE, SYR, FYE and FYR series

Lubrication Table 13
Technical specifications for the grease in SKF inch roller
SKF inch roller bearing units are intended for bearing units
grease lubrication. Property Specification

Thickener Lithium soap
Initial grease fill
Base oil type Mineral
SKF inch roller bearing units are filled with a
mineral oil based lithium grease that contains NLGI consitency class 2
EP additives. The initial grease fill at the fac- Temperature range [°F] –5 to +230
tory fills the bearing completely and 40 to 50% Base oil viscosity [SUS]
of the free space in the housing. The technical • at 105 °F 900
specifications of the grease are provided in • at 210 °F 82
table 13. The grease provides reliable per-
formance when operating between 95 and
230 °F. During start-up, temperatures down
to –5 °F are permissible. For short periods,
temperatures above 230 °F can be tolerated.
For additional information about permissible Table 14
temperatures of rolling bearing greases (the Grease quantities for relubricating inch roller bearing
SKF traffic light concept), refer to the informa- units
tion available online at skf.com/bearings. Shaft diameter Grease quantity
from to
in. g
Relubrication
SKF inch roller bearing units are typically 1 7 /16 1 1 /2 4
relubricated in order to realize maximum 1 11 /16 1 3 /4 4
1 15 /16 2 4
service life. All bearing units except those in
the FYRP series have a lubrication hole with 2 3 /16 2 3 /17 5 7
a 1/8-27 NPSF thread. They are provided 2 7 /16 2 1 /2 8
3
2 11 /16
standard with a grease fitting AH 1/8-27 PTF. 13
Units in the FYRP series have a 1/4-28 UNF 3 7 /16 3 1 /2 17
4
3 11 /16
straight thread, and are provided with a 4 7 /16 – – 21
28
grease fitting 1/4-28 UNF. 4 15 /16
Relubrication intervals
To calculate the relubrication intervals refer to
Relubrication intervals under Metric roller
bearing units († page 676). The relevant cal-
culation factors for SKF inch roller bearing
units are provided in tables 2 and 3
(† page 701).
Relubrication procedure
Before relubricating, the grease fitting and
the area surrounding it should be cleaned.
High-pressure cleaning equipment should be
avoided. During relubrication, grease should
be introduced via the grease fitting while the
shaft is rotating slowly. Excessive pressure
and over-greasing should be avoided, other-
wise the seals may be damaged.

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