Gear Housing - Husqvarna DMS 240 Workshop Manual

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GEAR HOUSING

Function
The gear housing contains a transmission that reduces the high speed of the
electric motor to a lower speed on the spindle shaft. The transmission has two
gear positions. Change gear when the motor is off.
The transmission is based on three shafts:
A. The primary shaft is driven by the electric motor which in turn drives
shaft B.
B. The secondary shaft reduces the speed to the spindle shaft C and has an
adjustable slip clutch to protect the operator and the machine in the event of
jamming.
C. The spindle shaft is driven by the secondary shaft and has a gear function.
B
Service work
The work procedure dictates that the complete primary shaft and secondary
shaft must always be dismantled first. The spindle shaft is then removed.
The spindle shaft with attendant components, is dismantled into individual
parts from the gear housing. Following dismantling of the components, the
spindle shaft can be removed from the gear housing.
Primary shaft
Removal
The primary shaft is force fitted on the ball bearings
at the bottom of the gear housing and cover. When
removing the cover, the primary shaft can jam in this
instead, as shown in the gear housing illustration.
Add a few pieces of wood to prevent damage to the
gear housing seal planes. Force the primary shaft with a
couple of breaking bars.
Fitting
Fit the primary shaft is fitted last in the gear housing.
If the shaft end is cooled and the bearing is heated to
about 100 °C/200 °F, the shaft can be fitted with or
without minimum press force.
Secondary shaft
Removal
The secondary shaft is force fitted on the ball bearings
at the bottom of the gear housing and cover. When
removing the cover, the secondary shaft can jam unlike
as shown in the gear housing illustration.
The shaft can often be lifted using a small force with
a couple of breaking bars. If it is firmly jammed, it can
be removed with a standard puller arranged as shown.
Add pieces of wood to the gear housing and make a
bridge with a sturdy iron object such as a cold chisel.
Lift the shaft with the puller.
Fitting
The primary shaft is fitted second last in the gear
housing. If the shaft end is cooled and the bearing is
heated to about 100 °C/200 °F, the shaft can be fitted
with or without minimum press force.