Husqvarna 324HDA, Workshop Manual

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4
Centrifugal clutch
502 50 18-01
Min. 1.0 mm
531 00 48-70
The centrifugal clutch has the task of transferring the power from the engine to the cutting equipment’s drive axle.
As the name implies, it works according to a centrifugal principle.
This means the clutch’s friction shoes are thrown outwards towards the clutch drum at a certain engine speed. When
the friction against the drum is sufficiently great it drives the drive shaft at the same speed as the engine.
Some slipping occurs between the clutch and the clutch drum when accelerating as well as in the reversed situation
when the cutting equipment jams. Thereby preventing abnormal load changes on the crankshaft.
The engagement speed has been carefully tested so that the engine can idle without the cutting equipment’s drive
shaft rotating.
Dismantling
Dismantle all covers so the clutch
becomes accessible.
Dismantling
Dismantle the air filter cowling and
cylinder cover.
Dismantle the fan housing cover with
fitted clutch cover.
Dismantle the clutch from the flywheel.
Dismantle the centrifugal clutch from
the flywheel.
Use tool 531 00 48-70 or, for example,
the shaft of puller 502 51 49-01 to
prevent the flywheel from rotating.
Insert the shaft between the bosses on
the flywheel.
Twist apart the clutch.
Inspect and replace damaged or worn
parts.
Twist apart the clutch and inspect the
spring and lining with regard to wear
and damage.
The thickness of the lining must be at
least 1.0 mm at the most worn point.
If the lining has worn unevenly both
clutch shoes must be replaced at the
same time to prevent imbalance.