Spark Plug; Air Filter; To Change Engine Oil - Husqvarna 5521P Operator's Manual

TO CHANGE ENGINE OIL (See Fig. 12)
NOTE: Before tipping lawn mower to drain oil, empty fuel
tank by running engine until fuel tank is empty.
1. Disconnect spark plug wire from spark plug and place
wire where it cannot come in contact with plug.
2. Remove engine oil cap; lay aside on a clean surface.
3. Tip lawn mower on its side as shown and drain oil into
a suitable container. Rock lawn mower back and forth
to remove any oil trapped inside of engine.
4. Wipe off any spilled oil from lawn mower or side of
engine.
5. Slowly pour oil down the oil fill spout, stopping every
few ounces to check the oil level with the dipstick.
6. Stop adding oil when you reach the FULL mark on the
dipstick. Wait a minute to allow oil to settle.
7. Continue adding small amounts of oil, rechecking
the dipstick until oil level settles at FULL. DO NOT
overfill, or engine will smoke heavily from the muffler
on startup.
8. Always be sure to retighten oil dipstick before starting
engine.
9. Re con nect spark plug wire to spark plug.
AIR FILTER (See Fig. 13)
Your engine will not run properly and may be damaged
by using a dirty air filter. Replace the air filter every 100
hours of operation or every season, whichever occurs first.
Service air cleaner more often under dusty conditions.
TO CLEAN AIR FILTER
1. Remove cover.
2. Carefully remove cartridge.
3. Clean by gently tapping on a flat surface. If very dirty,
replace cartridge.
4. Install cartridge, then replace cover.
CAUTION: Pe tro leum solvents, such as
ker o sene, are not to be used to clean
car tridge. They may cause de te ri o ra tion
of the cartridge. Do not oil car tridge.
Do not use pres sur ized air to clean or
dry car tridge.
MAINTENANCE
CONTAINER
FIG. 12
CARTRIDIGE
FILTER COVER
MUFFLER
Inspect and replace corroded muffler as it could create a
fire hazard and/or damage.

SPARK PLUG

Replace spark plug at the beginning of each mowing
season or after every 100 hours of operation, whichever
occurs first. Spark plug type and gap setting are shown in
the "PROD UCT SPEC I FI CA TIONS" section of this manual.
CLEANING
IMPORTANT: FOR BEST PERFORMANCE, KEEP MOWER
HOUSING FREE OF BUILT-UP GRASS AND TRASH. CLEAN
THE UNDERSIDE OF YOUR MOWER AFTER EACH USE.
CAUTION: Disconnect spark plug wire
from spark plug and place wire where it
cannot come in contact with plug.
• Clean the underside of your lawn mower by scraping
to remove build-up of grass and trash.
• Clean engine often to keep trash from accumulating.
A clogged engine runs hotter and shortens engine life.
• Keep finished surfaces/wheels free of all gasoline, oil, etc.
• With the exception of the water washout port (if
equipped), we do not recommend using a garden
hose to clean the outside of your lawn mower unless
the elec tri cal system, muffler, air filter and carburetor
are covered to keep water out. Water in engine can
result in shortened engine life.
12
TAB
SLOT
FIG. 13