Husqvarna DM 230 Workshop Manual page 13

GEAR HOUSING – BEARING REPLACEMENT
1
3
1
2
2
Tools
Dismantling
The following tools are required for dismantling the gear
housing's bearing:
1. Internal bearing extractor to grip behind the bearings.
2. Use a counter stay device where there is a dolly.
3. A slide hammer is an alternative to the counter stay
device if there is no dolly available.
Fitting
As these bearings are seldom replaced, no assembly device
has been produced. A suitable assembly tool can be very
easily produced using a screw of an appropriate length,
nut, washer and tape. Tape the threads ensuring the bea-
rings are held in place.
1. Turn the needle bearings with the text side facing the
washer. Press or knock down the bearings in place in the
gear box cover.
2. It is important that the washers have a sufficiently
large diameter to support the outer ring of the ball bea-
ring during assembly. Press or knock down the bearing in
place in the gear housing.
Bearing replacement
Dismantling needle bearings
The gear box cover's two needle bearings are removed as
per the method shown in the illustration. Apply the
counter stay either under the bearing or against the
bottom edge of the bearing's needles.
Fitting needle bearings
Fit the needle bearings with the text side upwards. The
opposite side is rounded in order to facilitate assembly.
Press the bearing down so that it is level with the top
edge of the bearing housing.
The easiest way of fitting the needle bearings in the
gear box cover is by using a vice and a suitable socket.
Alternatively you can knock the bearing in place using
the tool mentioned above.
Dismantling ball bearings
The gear housing's bearing for the intermediate shaft is
removed using the same counter stay tool device used for
the needle bearings.
There is no level support surface for the counter stay
device in the gear housing. The adjoining arrangement
gives the device a level support surface. Alternatively you
can use a slide hammer.
Fitting ball bearings
Start by fitting the bearing in the gear housing.
You should fit the intermediate shaft if possible by
pressing. If you knock instead, you must be careful not to
damage the bearing. Heat the bearing to around 100 °C
and cool the end of the shaft using cooling spray. Knock
in the shaft using a plastic hammer.
7
13