Special Function Components - Husqvarna DM 230 Workshop Manual

SPECIAL FUNCTION COMPONENTS

A.
D
D
B
C
B
D
A
Basic modules
The machine can be separated into three basic
modules:
1. The gear housing with three gear selection
positions.
2. The gear box cover that separates the oil-filled
gear housing from the opposite side where the
water to the drill spindle is supplied.
3. Electric motor.
Water passage
The water to the drill is directed into the gear box cover
between the gear housing and the motor. The water is then
directed on through the hollow spindle shaft (A) and runs
out at the drill attachment.
Important – seals
The design means that the following seals must be in perfect
condition:
– Double oil seals at the spindle shaft (A) and the O-ring around
the gear drive (B). The gasket (C) is added to the O-ring (B) to
the gear housing. If leaks were to occur from these seals, water
would fill the gear housing.
– Seal D. A defective O-ring will mean external
leaks.
C
Gear box cover
The gear box cover separates the oil in the gear housing
from one side and the water to the drill spindle on the
other gear box cover side. Dismantle the gear box cover to
access the gear housing units.
The gear box cover is also the bearing holder for the
upper needle bearings of the intermediate and spindle
shafts.
The seal between the gear box and the gear housing is
made up of a gasket and an O-ring.
Spindle shaft seals
The spindle shaft has two seals to the gear box cover; one
to the oil in the gear housing and the other to the water
side. The arrows show the path of the water to the drill
spindle.
The gear box cover has a channel (D) that runs between
the two seals and on to the outside. Any water or oil that
leaks here indicates that the seals are defective.
Replacing the seals
The easiest way of removing the spindle shaft seals is by
using a counter stay device, see page 13.
When assembling, press the first seal ring fully down to
the bottom. Fit the second seal so that it is level with the
top edge of the seal housing. Check that the channel (D)
runs out between the seals by inserting a steel wire or equi-
valent.
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