Husqvarna DM220 Workshop Manual page 15

GEAR HOUSING – BEARING REPLACEMENT
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Tools
Dismantling
The following tools are required for removing the gear
housing's bearing:
1. Internal bearing extractor to grip behind the bearings.
2. Use a counter stay device where there is a counterhold.
3. A slide hammer is an alternative to the counter stay
device if there is no counterhold available.
Assembly
Since replacement of these bearings rarely occurs, there is
no mounting device. Suitable mounting tools can be very
easily produced with screws at the appropriate lengths,
nuts, washers and tape. Tape the threads ensuring the
bearings 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 large enough
diameter to support the ball bearing's outer ring when
assembling. 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 assembly of the needle bearings in the gear box
cover is made easy with a press or with a vice.
Dismantling ball bearings
The gear housing's bearings for the intermediate shaft are
removed with the same expander tool used for the needle
bearings.
There is no level support surface for the counter stay
device in the gear housing. The adjacent arrangement
gives the puller's flat support surface. Alternatively you
can use a slide hammer.
Fitting ball bearings
The bearing is fitted in the easiest way using the proprie-
tary tool above in Figure 2.
Heating around the bearing seat reduces the press
force. Knock in the bearing with a plastic hammer on the
screw head.
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