Husqvarna ST 424 Bedienungsanweisung Seite 20

To clean the battery and the terminals
1. Remove the battery. Refer to
on page 19 .
2. Flush the battery with plain water and let it become
dry.
3. Clean the terminals and battery cable ends with a
wire brush until they are bright.
4. Lubricate the terminals with grease.
5. Install the battery. See
page 19 .
6. Install the battery cover.
Muffler
The muffler keeps the noise levels to a minimum and
sends the exhaust fumes away from the operator.
Do not use the product if the muffler is missing or
defective. A defective muffler increases the noise level
and the risk of fire.
Examine the muffler regularly to make sure that it is
attached correctly and not damaged.
CAUTION: The muffler becomes very hot
during and after use and when the engine
operates at idle speed. Be careful near
flammable materials and/or fumes to prevent
fire.
To examine the spark plug
CAUTION: Always use the recommended
spark plug type. Incorrect spark plug type
can cause damage to the product.
• Examine the spark plug if the engine is low on
power, is not easy to start or does not operate
correctly at idle speed.
• To decrease the risk of unwanted material on the
spark plug electrodes, obey these instructions:
a) Make sure that the idle speed is correctly
adjusted.
b) Make sure that the fuel mixture is correct.
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, see
page 27 .(Fig. 68 )
• 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.
20
To replace the battery
To replace the battery on
Technical data on
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.(Fig. 69 )
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.(Fig. 70 )
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.
(Fig. 71 )
• Replace the fuse for engine control unit (A) with a 5
A fuse.
• Replace the fuse for the starter solenoid (B) with a
20 A fuse.
• Replace the fuse for the LED and the heated grip (C)
with a 5 A fuse.
• Position (D) contains a backup 5 A fuse.
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