Husqvarna W520 Operator's Manual page 15

Maintenance
Examine the spark plug
Replace the oil (the first time after 5 h of use, then after each 50 h of
use)
Clean or replace the air filter
Examine the fuel system
To do a general inspection
• Make sure that all nuts and screws on the product
are tightened correctly.
To clean the product externally
• Use a brush to remove leaves, grass and dirt.
• Make sure that the air intake on the top of the engine
is not blocked.
• Do not use a high pressure washer to clean the
product.
• If you use water to clean the product, do not flush
water directly on the engine.
To clean the inner surface of the cutting
cover
1. Empty the fuel tank.
2. Put the product on its side with the muffler down.
CAUTION: If the product is put with the
air filter down, the engine can become
damaged.
3. Hose down the inner surface of the cutting cover
with water.
To examine the cutting equipment
WARNING: To prevent accidental start
remove the ignition cable from the spark
plug.
WARNING: Use protective gloves when you
do maintenance on the cutting equipment.
The blade is very sharp and cuts can easily
occur.
1. Examine the cutting equipment for damage or
cracks. Always replace a damaged cutting
equipment.
2. Look at the blade to see if it is damaged or blunt.
Note: It is necessary to balance the blade after it is
sharpened. Let a service center sharpen, replace and
balance the blade. If you hit an obstacle that causes the
product to stop, replace the damaged blade. Let the
service center estimate if the blade can be sharpened or
must be replaced.
1500 - 001 - 02.07.2020
Daily
To replace the blade
1. Lock the blade with a block of wood. (Fig. 47)
2. Remove the blade bolt.
3. Remove the blade.
4. Examine the blade support and blade bolt for
damage.
5. Examine the engine shaft to make sure that it is not
bent.
6. When you attach the new blade, point the angles of
the blade in the direction of the cutting cover. (Fig.
48)
7. Make sure that the blade is aligned with the center of
the engine shaft.
8. Lock the blade with a block of wood. (Fig. 49)
9. Attach the blade.
10. Tighten the bolts with a torque of 50 Nm. (Fig. 50)
11. Pull the blade around by hand and make sure that it
turns freely.
WARNING: Use heavy duty gloves. The
blade is very sharp and injuries can
easily occur.
12. Start the product to do a test of the blade. If the
blade is not correctly attached, there is vibration in
the product or the cutting result is unsatisfactory.
To do a check of the oil level
CAUTION: A too low oil level can do
damage to the engine. Do a check of the oil
level before you start the product.
1. Put the product on level ground.
2. Remove the oil tank cap with the attached dipstick.
3. Clean the oil from the dipstick.
4. Put the dipstick fully into the oil tank to give a correct
picture of the oil level.
5. Remove the dipstick.
6. Examine the oil level on the dipstick.
7. If the oil level is low, fill with engine oil and do a
check of the oil level again.
Weekly Monthly
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