Page 418 - SKF-bearing-housings

Split pillow blocks SAF and SAW series

Fig. 12 Circulating oil lubrication systems
W hen using a circulating oil lubrication system
with SAF and SAW pillow blocks, oil is intro-
duced through one of the inlet holes in the
housing cap and drained from one or both
holes in the base. For spherical roller bearings,
oil should be introduced through the centre
hole in the cap and drained from both sides
of the base († fig. 12). For self-aligning ball
bearings and CARB toroidal roller bearings,
oil should be introduced through the offset
hole in the cap and drained from the opposite
side of the base so that oil is forced through
the bearing († fig. 13).
Drains should lead downward immediately
outside of the housing to prevent the accumu-
lation of oil in the housing. Too high an oil level
can result in higher operating temperatures
due to churning of the lubricant. The drain
piping must be adequately sized and arranged
to provide adequate drainage. Additional con-
siderations may be necessary when using cir-
culating oil. These can include special seals,
cross drillings in the housing, wet sump
requirements, flow rates, and enlarged drain
holes. For additional information, contact the
SKF application engineering service.
Fig. 13
Mounting

SAF and SAW pillow (plummer) block housings
must be mounted properly using the appropri-
ate tools and state of the art mechanical
mounting methods. All the associated com-
ponents must also meet certain basic require-
ments († Specifications for shafts and housing
support surfaces on page 45). Mounting
instructions are provided with each housing.
For information about mounting rolling bear-
ings, refer to the SKF bearing maintenance
handbook or skf.com/mount.
Cap bolt torque specifications
Cap bolts should be tightened to the torque
values listed in tables 3 to 5 on pages 404 to
407.
Pinning or supporting the housing
Some load conditions may require the housing
to be pinned to its support surface or a stop to
accommodate loads acting parallel to the

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