Page 1016 - Rollingbearings

18 High temperature bearings
Relubrication and Designation

running in system

Relubrication Refer to the Designation system of the rele-
vant standard bearing:
All SKF high temperature bearings are lubri-
cated for the life of the bearing, except open • deep groove ball bearings, page 258
VA201 deep groove ball bearings, which • insert bearings, page 364
require relubrication
The general recommendation for an open Designation sufixes used with SKF bearings
VA201 bearing is to investigate the quality of for high temperature applications are
the lubricating paste in the bearing every six explained in the following:
months If there is no longer a ilm of dry
lubricant on the raceways, indicated by a -2F Insert bearing for high temperature
bright metallic shiny track, remove residues applications, with grub screw lock-
of the old lubricant with a solvent and, when ing, shield and linger on both sides
dried, replenish the bearing with lubricating -2Z Deep groove ball bearing for high
paste temperature applications, shield on
18 both sides
Running in VA201 Bearing for high temperature appli-
cations, with a stamped steel cage,
VA201 bearings operating at temperatures manganese phosphate coated rings
below 200 °C (390 °F) and at speeds below and rolling elements, radial clear-
25% of the limiting speed (product tables, ance of multiples of C5, and lubri-
page 1016 and page 1020) require running cated with a polyalkylene glycol/
in Open VA201 deep groove ball bearings graphite mixture
operating under these conditions also VA208 Bearing for high temperature appli-
require running in after relubrication cations, with a segmented cage
Running in requires the bearing to be made of graphite, manganese phos-
operated at a temperature of at least 200 °C phate coated rings and rolling ele-
(390 °F) for a minimum of 48 hours ments, and radial clearance of multi-
ples of C5
VA228 Bearing for high temperature appli-
cations, with a coronet cage made of
Mounting graphite, manganese phosphate
coated rings and rolling elements,
and radial clearance of multiples of
SKF high temperature deep groove ball C5
bearings should always be hot mounted to W Insert bearing for high temperature
reduce the mounting force and the risk of applications, without lubrication
breaking the graphite lubricant (VA208 and hole(s)
VA228 variants) An induction heater is the
preferred choice to heat the bearing during
mounting
Submerging the bearing in hot oil is not
recommended because the oil remaining in
the bearing might carbonize later during
operation
Do not use impact mounting methods
that could damage the bearing and prevent
proper functionality

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