Basic Structure - Husqvarna DM 330 Workshop Manual

4
1
A
A
D
6

BASIC STRUCTURE

2 3
B
C
Separation
Electric motor/gear
housing
Remove the four screws as
shown in the figure.
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 which is the bearing carrier
for the shafts in the gear housing and separates
the oil-filled gear housing from the electric motor.
3. Electric motor.
Water passage
Water to the drill spindle is routed directly in to the
spindle shaft from the water bracket (B). A seal holder (A)
is pressed into the gear box cover and seals with this using
two O rings. The small O ring is the seal to the water
bracket (B).
Shaft seal
The seal holder has two radial seals (C) that seal to the
spindle shaft. There is a space between these seals that is
located in connection to the leak channel (D).
Fault indicator
Any water or oil that leaks out through the leak channel
(D) indicates that the radial seals (C) are defective. Water
alone indicates that the upper seal is defective while oil
indicates that the lower seal to the gear housing is defective.
A mixture of oil and water shows that both seals are defec-
tive and that water has leaked into the gear housing.
Check during service
As a rule you should check that the seals are intact on the
machines that are to be serviced. If the seals show signs of
wear, or if the machine has many operating hours, the
seals should be replaced as a preventive measure.
Gear housing/electric motor
Virtually all service work requires the separation of the
gear housing from the electric motor.
Separation
Electric motor/gear housing
Four screws hold the motor to the gear
housing. Remove these. The unit can
now be divided.