Lubrication; Air Filter; To Clean Air Filter; To Change Engine Oil - Husqvarna 6521RS Owner's Manual

ENGINE

LUBRICATION

Use only high quality detergent oil rated
with API service classifi cation SG–SL. Se-
lect the oil's SAE viscosity grade according
to your expected operating temperature.
SAE VISCOSITY GRADES
5W-30
-20 0 30 32
F
C -20 0
-30 -10
TEMPERATURE RANGE ANTICIPATED BEFORE NEXT OIL CHANGE
NOTE: Although multi-viscosity oils
(5W30, 10W30 etc.) improve starting in
cold weather, these multi-viscosity oils will
result in in creased oil consumption when
used above 32°F. Check your engine oil
level more frequently to avoid possible
engine damage from running low on oil.
Change the oil after every 25 hours of op-
eration orat least once a year if the mower
is not used for 25 hours in one year.
Check the crankcase oil level before
starting the engine and after each fi ve (5)
hours of continuous use. Tighten oil plug
securely each time you check the oil level.

TO CHANGE ENGINE OIL

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 re-
move any oil trapped inside of engine.
Container
4. Wipe off any spilled oil from lawn
mower or side of engine.
5. Slowly pour oil down the oil fi ll 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.
SAE 30
40 100
60 80
10
20 30 40
14
7. Continue adding small amounts of oil,
rechecking the dipstick until oil level
settles at FULL. DO NOT overfi ll, or
engine will smoke heavily from the
muffl er 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

Your engine will not run properly and
may be damaged by using a dirty air
fi lter. Replace the air fi lter cartridge every
100 hours of op er a tion or every season,
which ev er occurs fi rst. Service air cleaner
more often under dusty conditions.

TO CLEAN AIR FILTER

1. Loosen screw and tilt cover to re move.
2. Carefully remove cartridge.
3. Clean by gently tapping on a fl at sur-
face. If very dirty, replace car tridge.
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.
4. Install cartridge, then replace cover
making sure the tabs are aligned with
the slots in the back plate. Fasten
screw securely.
Lip
Cartridge
MUFFLER
Inspect and replace corroded muffl er as it
could create a fi re hazard and/or dam age.
SPARK PLUG
Replace spark plug at the beginning of
each mowing season or after every 100
hours of operation, whichever occurs
fi rst. Spark plug type and gap setting
are shown in the "PROD UCT SPEC I FI C-
A TIONS" section of this manual.
Back plate
Slot
Cover
Cover tab