Needle Bearing Lubrication; Adjustment Of The Oil Pump; Cooling System - Husqvarna 3120XP Operator's Manual

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 a high-quality bearing grease or engine oil.

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.
WARNING! The engine must not be running
!
when making adjustments.
Recommended settings:
Bar 24"-28": 0 turns from the closed position.
Bar 28"-34": 3/4 turns from the closed position.
MAINTENANCE
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.

Cooling system

To keep the working temperature as low as possible the
machine is equipped with a cooling system.
The cooling system consists of:
1 Air intake on the starter.
2 Air guide plate.
3 Fins on the flywheel.
4 Cooling fins on the cylinder.
5 Cylinder cover (directs cold air over the cylinder).
Clean the cooling system with a brush once a week, more
often in demanding conditions. A dirty or blocked cooling
system results in the machine overheating which causes
damage to the piston and cylinder.
Below you will find some general maintenance instructions.
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