Air Filter; To Change Engine Oil - Husqvarna 67521HVE Owner's Manual

Change the oil after every 25 hours of operation or at least
once a year if the lawn 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 (See Fig. 16)
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.
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.
7. Continue adding small amounts of oil, rechecking the
dipstick until oil level settles at FULL. DO NOT over-
fi 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 (See Fig. 17)
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 surface. If very dirty,
replace car tridge.
MAINTENANCE
FIG. 16
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.
BACK PLATE
SLOTS
LIP
CARTRIDGE
MUFFLER
Inspect and replace corroded muffl er as it could create a
fi re 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
fi rst. 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 fi nished surfaces and wheels free of all gasoline,
oil, etc.
• We do not recommend using a garden hose to clean
lawn mower unless the electrical system, muffl er, air
fi lter and carburetor are covered to keep water out.
Water in engine can result in shortened engine life.
CLEAN UNDER DRIVE COVER
Clean under drive cover at least twice a season. Scrape un-
derside of cover with putty knife or similar tool to remove any
build-up of trash or grass on underside of drive cover.
13
COVER
COVER
FIG. 17
TABS