Husqvarna R120S 用户手册

22 – 

English

The tire pressure should be 60 kPa / 0.6 bar / 8,7 PSI on all 
wheels. In order to improve traction, the pressure in the rear 
tyres can be reduced to 40 kPa / 0.4 bar / 6 PSI.

The engine is equipped with an electronic ignition system. 
Only the spark plug requires maintenance.

For recommended spark plug, see Technical data.

1

Remove the ignition cable boot and clean around the 
spark plug.

2

Remove the spark plug with a 5/8” (16 mm) spark plug 
socket wrench.

3

Check the spark plug. Replace the spark plug if the 
electrodes are burned or if the insulation is cracked or 
damaged. Clean the spark plug with a steel brush if it is to 
be reused.

4

Measure the electrode gap with a gapping tool. The gap 
should be 0.75 mm/0.030”. Adjust as necessary by 
bending the side electrode.

5

Reinsert the spark plug, turning by hand to avoid 
damaging the threads.

6

Tighten the spark plug, once it touches the seating, with 
the spark plug socket wrench. Tighten the spark plug so 
that the washer is compressed. A used spark plug should 
be turned 1/8 of a turn from the seated position. A new 
spark plug should be turned a 1/4 turn from the seated 
position.

7

Replace the ignition cable shoe.

The main fuse is placed in a detachable holder behind the 
battery under the protective cover.

Type: Flat pin, 15 A.

Do not use any other type of fuse when replacing.

A blown fuse is indicated by a burnt connector. Pull the fuse 
from the holder when replacing.

The fuse is there to protect the electrical system. If it blows 
again shortly after replacement, it is due to a short circuit, 
which must be fixed before the machine can be put into 
operation again.

The machine is equipped with a safety system that prevents 
starting or driving under the following conditions.

The engine can only be started when:

•

The cutting deck is raised and the parking brake is 
applied.

The engine should stop when:

•

The cutting deck is lowered and the driver rises from the 
seat.

•

The cutting deck is in its raised position, the parking brake 
is not applied and the driver rises from the seat.

Check daily to ensure that the safety system works by 
attempting to start the engine when one of the conditions 
above is not met. Change the conditions and try again.

Clean the air intake grille in the engine cover behind the 
driver’s seat.

IMPORTANT INFORMATION Different tire pressures on 
the front tires will result in the blades cutting the grass at 
different heights.

Fitting the wrong spark plug type can damage the engine.

Inadequately tightened spark plugs can cause overheating 
and damage the engine. Tightening the spark plug too 
much can damage the threads in the cylinder head.

Do not turn over the engine if the spark plug or ignition cable 
has been removed.