Husqvarna 5521CM 用户手册

Your engine will not run properly and may be damaged 
by using a dirty air fi lter. Replace the air fi lter every 100 
hours of operation or every season, whichever occurs fi rst.  
Ser vice air cleaner more often under dusty conditions.  See 
the main te nance section of your engine manual.

Inspect and replace corroded muffl er as it could create a 
fi re hazard and/or damage.

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.

IMPORTANT:  FOR BEST PERFORMANCE, KEEP MOWER 
HOUSING FREE OF BUILT-UP GRASS AND TRASH.  CLEAN 
THE UNDERSIDE OF YOUR MOWER AFTER EACH USE.

•      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.

NOTE:  Before tipping lawn mower to drain oil, drain 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 spark 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.   Fill engine with oil.  (See “ADD OIL” in the Operation 

section of this manual).

6.    Reconnect spark plug wire to spark plug.