Muffler; Needle Bearing Lubrication; Adjustment Of The Oil Pump; Extra Chain Oil - Husqvarna 3120XP Operator's Manual

Muffler
The muffler is designed to reduce the noise level and to direct
the exhaust gases away from the operator. The exhaust
gases are hot and can contain sparks, which may cause fire
if directed against dry and combustible material.
Some mufflers are equipped with a special spark arrestor
mesh. If your machine has this type of muffler, you should
clean the mesh at least once a week. This is best done with a
wire brush.
CAUTION! The mesh must be replaced if it is damaged. If the
mesh is blocked the machine will overheat and this will cause
damage to the cylinder and piston. Never use a machine with
a muffler that is in poor condition.

Needle bearing lubrication

The clutch drum is fitted with one of the following drive
sprockets:
• A Spur sprocket (the chain sprocket is welded on the
drum)
• B Rim sprocket (replaceable)
Both versions have a needle bearing on the drive shaft, which
has to be greased regularly (once a week).
CAUTION! Use only high quality bearing grease or engine oil.
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MAINTENANCE

Adjustment of the oil pump

The oil pump is adjustable. Adjustments are made by turning
the screw using a screwdriver or combination spanner. The
machine is supplied from the factory set to 1 turn open.
Turning the screw clockwise will reduce the oil flow and
turning the screw anti-clockwise will increase the oil flow.
!
Recommended settings:
Bar 24"-28": 0 turns from the closed position.
Bar 28"-34": 3/4 turns from the closed position.
Bar 34"-42": 1 1/2 turns from the closed position.
Bar 42" and longer: 1 3/4 turns from the closed position.
These recommendations apply to Husqvarna's chain oil, for
other chain oils increase the oil flow by one step.

Extra chain oil

Under EXTREME conditions the chain and bar may require
extra chain oil. The oil flow should only be increased when the
engine is running and the chain rotating. Push the lever to the
right, where it will automatically be held in the locked position.
Press in the lever button to release it.
Note: It is not necessary to pump continuously. When the
extra oil flow has been activated oil consumption increases by
40-80%, depending on the oil pump's basic setting.
WARNING! The engine must not be running
when making adjustments.