Husqvarna LC 451S Operator's Manual page 14

• 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.
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.
14
a) On model LC 451S, LC 451V, LC 551SP, attach
the spring washer and tighten the bolt and
washer with a torque of 70 Nm.
b) On model LC 551VBP, tighten the bolts with a
torque of 50 Nm. (Fig. 50)
10. 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.
11. 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.
To fill and replace the engine oil
• For information on how to fill and replace the engine
oil, refer to the operator's manual for the engine.
To clean and replace the air filter
• For information on how to clean and replace the air
filter, refer to the operator's manual for the engine.
To examine the spark plug
CAUTION: Always use the recommended
spark plug type. Incorrect spark plug type
can cause damage to the product.
• Examine the spark plug if the engine is low on
power, is not easy to start or does not operate
correctly at idle speed.
• To decrease the risk of unwanted material on the
spark plug electrodes, obey these instructions:
a) Make sure that the idle speed is correctly
adjusted.
b) Make sure that the fuel mixture is correct.
c) Make sure that the air filter is clean.
929 - 001 - 29.10.2018