Husqvarna PG 400 Petrol Operator's Manual page 15

To clean the air filter
WARNING: Use approved respiratory
protection when you clean or replace the air
filter. Discard used air filters correctly. The
dust in the air filter is dangerous to your
health.
WARNING: Do not clean the air filter with
compressed air. This causes damage to the
air filter and the risk increases that you
breathe the dangerous dust.
1. Remove the air filter, refer to
on page 14 .
2. Clean the air filter housing with a brush.
3. Tap the air filter against a hard surface or use a
vacuum cleaner to remove the particles.
CAUTION: Do not let the nozzle of the
vacuum cleaner touch the surface of the
paper filter element. Keep a small
distance. The sensitive surface of the
paper filter element becomes damaged if
objects touch it.
4. Examine the air filter for damage.
5. Discard the air filter if it is damaged.
CAUTION: Always replace a damaged
air filter, or the dust will go into the
engine and cause engine damage.
6. Clean the foam filter with soap and water.
7. Flush the foam filter in clean water.
8. Squeeze the water from the foam filter and let it dry.
9. Lubricate the foam filter with engine oil.
10. Press a clean cloth against the filter to remove
unwanted oil.
Note: Smoke will come out from the engine if there is
too much oil in the foam filter when the engine starts.
11. Put the air filter cover back. Refer to
air filter on page 14 .
To do a check of the brush strip
• Make sure that the brush strip is not damaged and
that it seals tightly against the floor.
To examine the spark plug
WARNING: Let the spark plug become cool
before you replace it.
883 - 001 - 07.11.2019
To examine the air filter
To examine the
CAUTION: Always use a correct spark plug.
Technical data on page 17 .
Refer to
CAUTION: Make sure that the spark plug
has the correct distance and that it is clean
from deposits.
1. Disconnect the spark plug cap, and remove dirt from
the spark plug area.
2. Remove the spark plug with a 13/16 in./21mm spark
plug wrench.
3. Examine the spark plug. Replace it if it is damaged,
if the electrode (A) is worn or if the sealing washer
(B) is in bad condition.
4. Measure the spark plug electrode gap with a feeler
gauge for wires. Make sure that the distance is
Technical data on page 17 .
correct. Refer to
5. If it is necessary, bend the side of side electrode
carefully to correct the distance.
6. Install the spark plug carefully, by hand.
7. Tighten the spark plug with a 13/16 in./21mm spark
plug wrench to compress the washer.
a) If you install a new spark plug, tighten ½ turn
after the spark plug seats to the compressed
washer.
b) If you install the same spark plug, tighten ⅛-¼
turn after the spark plug is against the
compressed washer.
CAUTION: A loose spark plug can
become too hot and cause damage
to the engine. If the spark plug is too
tight, it can cause damage to the top
of the cylinder.
8. Attach the spark plug cap to the spark plug.
A
B
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