Husqvarna DM 230 Workshop Manual page 17

ROTOR
Dismantle the bearing holder and
bearing.
Check that the O-rings are intact.
Reassembly
Start by fitting the bearing in
the bearing holder.
Fit the bearing unit on the
rotor shaft. Use a tool that
presses against the inner ring,
such as a 12 mm socket.
Lubricate the O-rings and fit
the rotor in the motor housing.
Reassemble the other parts.
!
Gear box cover side –
bearing replacement
Press the rotor shaft out of the
bearing.
Remove the circlip and spring
washer under this.
Remove the bearing with a
counter stay device.
Remove the oil seal.
Reassembly
Press in the new bearing with support on the outer ring. Fit the spring washer
on the circlip.
Fitting the rotor shaft in the bearing is difficult without a pressing tool.
When fitting, press forces will arise between the outer and inner rings, which
means that assembly by knocking in must be avoided.
If a pressing tool is unavailable, a makeshift solution would be to heat the
bearing to around 100 °C and cool the rotor shaft with cooling spray. With a
few careful knocks with a heavy rubber or plastic hammer, you can install the
shaft in place in the bearing.
Dismantle the bearing holder and bearing
individually or together.
Check that the O-rings are intact. Replace
these where necessary.
Reassembly
Start by fitting the bearing in the bearing
holder. Select a tool that covers the outer
ball race e.g. Husqvarna 502 50 82-01
(intended for the oil seals in power
cutters).
Fit the bearing unit on the rotor shaft. In
order to avoid damage to the bearing, use
a tool that presses against the inner ring,
such as a 12 mm socket.
Remember to refit the speed sensor.
Lubricate the O-rings and fit the rotor in
the motor housing. Reassemble the other
parts.
Gear box cover side – bearing
replacement
Press the rotor shaft out of the bearing
using a counter stay device. Attach the
claws of the counter stay device where the
casting is thickest.
Remove the circlip and the wave shaped
spring washer under this.
Use a counter stay device to pull out the
ball bearings. (Page. 13 explains how to
use the counter stay device.)
Also replace the oil seal under the ball
bearing. Use a counter stay device to
remove the seal.
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