Gear Housing - Bearing Replacement - Husqvarna DM220 Workshop Manual

7 GEAR HOUSING – BEARING REPLACEMENT
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Bearings
The bottom bearings in the spindle shaft are press-fitted in the gear housing
and on the shaft. The retaining rings on the shaft and in the gear housing
secure the bearing. The black seal cylinder has radial seals at both ends, on
the bearing and the tool holder. The cylinder is locked against rotation to the
machine body. Always replace the whole sealing cylinder, or the radial seals if
the spindle shaft is removed.
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Important
Be careful not to scratch the shaft where the radial seal and needle bearing
come into contact.
Bearing replacement – spindle shaft
Remove the outer circlip
Remove the circlip using circlip pliers.
Press or pull out the spindle shaft
With the hydraulic press, the shaft is pressed out of the
gear housing together with the bearing. Never knock out
the spindle shaft!
The adjacent arrangement works well for pulling out
the spindle shaft with the bearing.
Support the gear housing with the vice. Tape a flat
iron, such as a cold chisel, on the opposite side. Insert the
puller claw at the spindle shaft's wrench attachment and
pull the shaft out with the puller.
Remove the inner circlip
Remove the ball bearing's inner circlip.
Remove the bearing
The bearing cannot be removed by pressing. Use bearing
puller 531 00 48-67 or equivalent. Push the seal cylinder
so that a gap occurs where the puller jaws are applied.
Pull the bearing out of the spindle shaft.
Replace the seal cylinder
Replace the seal cylinder when replacing bearings.
Lubricate the seals. Fit the cylinder to the shaft.
Reassembly
If possible cool the shaft in a cold store or with cooling
spray and heat the bearing to about 100°C before moun-
ting. The bearing can then be fitted with a light pressing
force. A block of wood with a hole diameter equivalent to
the bearing's inner ring works well as support and with-
out risk of damaging the surface under the radial seal. Fit
the inner circlip.
Fit the spindle shaft
Cool the ball bearing with cooling spray or put the shaft
in a cold store. Heat the bearing seat on the gear housing
(arrows) to about 100 °C. The spindle shaft can then
usually be fitted in the gear housing with a minimal press
force.
Note the seal cylinder's guide pin that is to be fitted
into the groove in the gear housing.