Husqvarna 67521HVE User Manual

Page of 24
13
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.
MAINTENANCE
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.
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.
CONTAINER
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. 
FIG. 17
SLOTS
LIP
COVER 
TABS
CARTRIDGE
COVER
BACK PLATE