Gear Housing - Primary Shaft - Husqvarna DM 650 Workshop Manual

GEAR HOUSING – PRIMARY SHAFT
C
B
D
Gear housing
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 is based on
three shafts:
A. The primary shaft where the upper gear wheel is driven by the gear wheel on
the motor's output shaft. A slip clutch, which protects against overloading, is inte-
grated with the gear wheel.
B. The secondary shaft is connected to the gear selector and the components in
the shaft provide two gear positions that are controlled by handle D. You change
gear with an idle motor.
A
C. The spindle shaft's only gear wheel is driven by the upper gear wheel of the
secondary shaft.
Service work
The service work that is most likely to be considered is the adjustment of the primary
shaft's slip torque and the replacement of the spindle shaft due to mishandling.
The slip clutch has a slip fit on the primary shaft. The spindle shaft can be replaced,
when the gear wheel on this has been dismantled, without affecting the other shafts.
Gear housing oil: Transmission oil SAE 75W-90, 1 litre
Synthetic transmission oil according to API GL-5, for example,
Mobil Lube 1 SHC 75W-90, Shell Spirax ASX 75W-90.
The oil in the gear housing needs replacing after 300 hours. Replace the brass
washer at the top of the secondary shaft at the same time.
Primary shaft
The primary shaft consists of two main components,
the slip clutch and the actual primary shaft. The slip
clutch is driven by the motor's output gear wheel. A
squared drive on the slip clutch connects to the shaft.
One of the two lower gear wheels drives the secondary
shaft depending on the gear position.
(The slip clutch is described on Page 8.)
Dismantling
Start by removing the slip clutch from the primary
shaft, see Page 8.
Lift up the oil pipe.
Remove the primary shaft using a standard puller.
Place two wooden strips on the gear housing and
place a heavy metal object such as a chisel as a bridge
between the wooden strips. Fasten the puller claw under
the gear wheel. Apply the puller screw against the chisel
and push up the shaft with the puller.
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