Water/Dust Unit - Husqvarna DM220 Workshop Manual

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WATER/DUST UNIT

Function
Water supply or dust extraction
Drilling with the DM220 can be performed either with water cooling or dry
with dust extraction.
Construction
1. For connecting, you either use the water hose or the sleeve for dust
extractor. The casing is rotatable with the front handle. The casing is held in
place by a plastic ring in the casing's outer ring that locks the unit.
2. Two O-ring seals between the casing and the gear housing.
3. The seal between the rotating spindle shaft and gear housing consists of a
cylinder which has radial seals at both ends. The cylinder is locked against
rotation to the gear housing.
4. The holes in the drilling spindle lead out to the drill attachment.
Service
The casing seals, consisting of two O-rings, can be replaced from the outside of
the machine. To replace the cylinder (3), that seals between the spindle shaft and
gear housing, you must first remove the spindle shaft from the gear housing.
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Replacing the seals
Remove the casing
1. The outer ring has a break slot for dismantling. Break
up the ring a little with a screwdriver.
2. Continue to break up the ring all around until it
releases its grip. Pull off the outer ring, the casing and
the inner ring.
Replace O-rings
3. Remove the O-rings and clean. Lubricate the new
O-rings and fit these.
Replace the plastic retaining ring
Always replace with new plastic rings once it has
been dismantled. The outer ring has a break slot for
removing the plastic ring.
Press the new plastic ring in the outer ring. Lubricate
the inside of the plastic ring.
Fit the casing
Assemble the inner ring, casing, and fit the outer ring
dog to the inner ring.
Fit the outer ring by tapping around the outside, then
insert this in to its locking groove in the gear housing.