Page 546 - SKF-bearing-housings

Flanged housings FNL series

Lubrication Table 5
Initial grease fill
FNL flanged housings are designed for grease Housing Initial fill
lubrication. The lubricant should be selected Size 20% 40%
based on the operating conditions of the bear- – g
ing. For additional information about lubricant
selection, refer to the product information FNL 505 10 15
available online at skf.com. FNL 506 15 25
FNL 507 25 35
FNL 508 30 45
Initial grease fill FNL 509 35 50
FNL 510 35 50
If no other requirements exist, the free space
in the bearing should be completely filled with FNL 511 40 60
FNL 512
90
60
grease and the free space in the housing should FNL 513 80 120
be filled to 20 to 40% of its volume. A 40% FNL 515 150 250
grease fill is required when bearings have to be FNL 516 180 300
relubricated from the side, while a 20% grease FNL 517 210 350
fill is used when bearings are relubricated via FNL 518 250 400
the outer ring. FNL 520 320 500
FNL 522
420
650
For highly contaminated environments and
slow speeds, fill the housing to 70–80%. For
additional information, contact the SKF appli-
cation engineering service.
Quantities for 20 and 40% grease fills are
listed in table 5. Fig. 10
The values are valid for a typical lithium Relubrication holes
3
grease (about 0,95 g/cm ). They include
grease for the bearing and the seals.
In most applications, the initial grease fill
will adequately lubricate the bearing until the
grease is exchanged during the next planned
inspection.
Relubrication
Certain operating conditions such as high
speeds, high temperatures or heavy loads may
require relubrication. Therefore FNL housings
have two holes that have been drilled and
tapped for an AH 1 /8-27 PTF grease fitting
(† fig. 10). On a new housing, the holes are
covered by plastic plugs. These plugs should
be replaced with the grease fitting and the
threaded plug supplied with the housing. If a
larger grease fitting or other equipment has to
be used an adapter to change to a G 1 /4 thread
is available († page 48).
Excess grease can escape via the seals. If
this is not enough, SKF can supply housings
with a grease escape hole in the cover (desig-
nation suffix V) on request. SKF recommends
removing the housing cover periodically to
remove used grease. The time interval for this

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