SKF ConCentra - Relubrication

If relubrication is needed, the relubrication
intervals can be estimated following the
method explained under the Lubrication
chapter of SKF General Catalogue.
The SKF ConCentra ball bearing units
have a grease fitting with different threads:
1/4-28 UNF for units metric shafts (all •
sizes) and for inch shafts size 1˝
1/8 NPT for units inch shafts sizes larger •
than 1˝
The 1/4-28 UNF thread can be changed to
G 1/4 using an LAPN 1/4 28 UNF adapter.
Relubrication procedure
When relubricating, grease should be
pumped slowly into the bearing as it rotates,
until fresh grease starts to escape from
the seals.
NOTE: Excessive pressure from pumping
too quickly may damage the seals.
Greases for Relubrication
To relubricate SKF ConCentra ball bearings
SKF LGWA 2, LGMT 2 or LGMT 3 greases
can be used. Each of these greases is fully
compatible with the original grease filled in
the factory.
Storing SKF ConCentra ball
bearing units
Because they are treated with a rust
preventive compound, SKF ConCentra
ball bearings can be stored in their original
unbroken package for a number of years
provided the relative humidity of the
storeroom does not exceed 60% and there
are no great fluctuations in temperature.
When stored for an extended period, these
ball bearing units may have a higher initial
torque than a newer unit. If not stored in
their original packaging, SKF ConCentra ball
bearings and SKF ConCentra ball bearing
units should be well protected from
moisture and contaminants.
Diagram 1
Service life of the grease fill in SKF ConCentra ball bearing units
as a function of
the operating temperature, °C•
the rotational speed n, r/min•
the bearing mean diameter dm, mm (• † table 2)
100 000
90 000
80 000
70 000
60 000
50 000
40 000
30 000
20 000
10 000
0
0 40 45 50 55 60 65 70 75 80 85 90 95 100
n × d
m
= 250 000
200 000
150 000
100 000
50 000
t
f
, operating hours
Operating temperature, °C
Table 3
Reduction factor for the grease life,
depending on the load
Load P
Reduction factor
≤ 0,05 1
0,1 C 0,7
0,125 C 0,5
0,25 C 0,2
16