Husqvarna DM 650 Workshop Manual page 15

GEAR HOUSING – BEARING REPLACEMENT
The spindle shaft bearing in the gear
box cover
Dismantling
The bearing is easily removed with a counter stay device
as shown in the adjacent image. Place a few pieces of
wood under the legs of the counter stay device to distri-
bute the pressure.
If the bearing is too tight, it helps to heat around the
bearing seat.
The bearing can also be removed by pressing. The
sealing unit must be removed first in order to access the
bearing.
Sealing unit
The sealing unit is a complete unit with double radial
seal on the spindle shaft, and two O-rings that seal
against the gear box cover. The unit must always be
replaced if the spindle shaft bearing or spindle shaft is
replaced.
Note the guide washer that sits at the bottom of the
sealing device seat.
The removal and fitting of hose clamps is described on
Page 19.
Remove the sealing unit
Remove the two screws.
The easiest way is to press out the sealing unit from the
bearing side and then remove the bearing. Place a socket
on the guide washer and press out the sealing unit. If the
guide washer is deformed, replace it.
Fitting ball bearings
Fit the ball bearing using the hydraulic press.
Support the gear box cover against the surface closest to
the bearing housing as shown in the image to the left.
It is important to apply pressing force to the ball
bearing's outer ring, as shown in the image to the right.
The ball bearing can be fitted without any pressing forces
by heating the bearing seat to about 100 °C and cooling
the ball bearing.
Fitting the sealing unit
To avoid the risk of leakage, it is important to grease the
two outer O-rings and the two inner radial seals that seal
to the spindle shaft. Also grease the spindle shaft where it
runs against the sealing unit. Use waterproof grease.
Do not forget the guide washer
Note that the guide washer must be fitted first. The collar
should be turned upwards. (The guide washer controls the
spindle shaft during assembly to ensure that the radial
seals are not damaged.)
Now press in the sealing unit and screw it in place.
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