Page 414 - SKF-bearing-housings

Split pillow blocks SAF and SAW series

Relubrication Fig. 8
SAF and SAW housing caps have two drilled
and tapped lubrication holes, one centred and
one offset, († fig. 8) that are sealed with
standard pipe plugs.
The housings also have dimples on the cap
where holes can be drilled and tapped if other
positions are required. Two dimples on the
outer sides of the central ridge indicate the
position of lubrication holes to lubricate laby-
rinth seals. All SAF and SAW housing bases
are equipped with a drain plug on each side
(† fig. 9) to purge or drain old lubricants or to
serve as an outlet for circulating oil. The sump
in the housing base is large enough to accom-
modate a sufficient quantity of lubricant to
provide reliable long-term operation.
Relubrication via the outer ring Fig. 9
The hole in the centre of the cap should be
used to relubricate spherical roller bearings
with a relubrication feature (a lubrication
groove and holes in the outer ring) († fig. 10).
When applying grease via the relubrication
feature, the shaft should be rotating.
Narrow bearings (dimension series 13 and
22) in the locating position can be displaced
axially, so that the relubrication groove in the
bearing does not line up with the relubrication
hole in the housing cap. Make sure the bearing
is sufficiently centred when relubricating.
Relubrication from the side
When relubricating from the side, which is
typically necessary for self-aligning ball bear-
ings and CARB toroidal roller bearings, the
offset hole in the housing should be used. Fig. 10
SAF housings from size 507 to 528 have an
integral flange that guides grease from the
grease fitting directly to the rolling elements
(† fig. 11).
When bearings mounted on an adapter
sleeve have to be relubricated from the side,
the grease should be introduced from the side
opposite the lock nut.
When bearings mounted at the end of a
shaft have to be relubricated from the side, the
grease should be applied at the point closest to
the end plug.

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