2
EN
1. Application
The aluminium heating ring is developed for
dismounting inner rings of cylindrical roller
bearings. The aluminium ring is available for the
NU, NJ and NUP series, i.e. bearings without
langes
or with only one lange in the inner ring.
2. Technical data
The heating ring is made of an aluminium alloy.
Two different designs are available:
a) Bore < 200 mm.
The ring is equipped with three handles as
shown on the picture.
b) Bore > 200 mm.
The ring is equipped with a special locking
device for pressing the ring around the bearing
and two handles to facilitate the positioning of
the ring.
3. Dismounting procedure
a) Clean the inner ring and aluminium ring.
b) Coat the raceway of the inner ring with an oil
with following speciications:
• heat resisting 280 °C
(536 °F)
.
• heat transmitting.
• rust preventing.
• high viscosity.
c) Heat the aluminium ring to 280 °C
(536 °F)
.
For correct temperature control SKF advises
the use of a thermometer, e.g. the
SKF Advanced thermolaser TKTL 10
with surface probe TKDT 10.
d) Place the aluminium ring around the bearing
inner ring and press the handles together
(or clamp locking device). Wait for a short time,
then try to rotate the tool with the ring until it
comes loose from the shaft.
For mounting it is recommended to heat the bearing
inner ring by means of a hot plate. No open ire, as
this might change the material structure.
Original instructions
