Husqvarna ST 424 Manuel D'utilisation page 19

c) Make sure that the air filter is clean.
• If the spark plug is dirty, clean it and make sure
that the electrode gap is correct, refer to
Technical data on page 29 .
• Replace the spark plug if it is necessary.
To inspect the augers and the
scraper bar
1. Before each use, inspect the augers and the
scraper bar for wear.
2. If the edge of the scraper bar is worn, reverse the
scraper bar. If the scraper bar has damages or is
worn on both edges, replace it.
3. If the edges of the augers are worn, contact an
authorized service center to replace them.
To replace the auger shear pins
The auger shear pins protect the product from
damage. The auger shear pins break if an object
comes into the moving parts.
CAUTION: Use only original equipment
shear pins supplied with the product.
1. If an auger shear pin breaks, stop the engine and
wait for the moving parts to stop.
2. Remove the ON/OFF key and disconnect the
spark plug cable.
3. Align the hole in the auger hub (B) with the hole
in the auger shaft (C) and install a new ¼ - 20 x 2
shear pin (A).
4. Install a ¼-20 locknut (D) on the shear pin and
tighten.
876 - 011 - 11.05.2020
A
C
B
D
5. Put the ON/OFF key in the ignition and connect
the spark plug cable to the spark plug.
To replace the impeller shear pins
The impeller shear pins protect the product from
damage. The impeller shear pins break if an object
comes into the moving parts.
CAUTION: Use only original equipment
shear pins supplied with the product.
1. If an impeller shear pin breaks, stop the engine
and wait for the moving parts to stop.
2. Remove the ON/OFF key and disconnect the
spark plug cable.
3. Align the hole in the impeller hub (A) with the
holes in the impeller shaft (B) and install a new
¼-20 shear pin (C).
4. Install a ¼-20 locknut (D) on the shear pin and
tighten.
C
A
D
5. Put the ON/OFF key in the ignition and connect
the spark plug cable to the spark plug.
To replace the fuse
The fuse holders are installed behind the battery
cover.
B
B
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