Solo USA 280 用户手册

MS 270, MS 270 C, MS 280, MS 280 C

The chain brake is subject to normal 
wear. It is necessary to have it serviced 
and maintained regularly by trained 
personnel, such as your STIHL servicing 
dealer, at the following intervals:

  

:

Use a suitable screwdriver to turn 
the shutter (1) from the summer  
position (

s) to the winter position 

(

r) – the shutter must snap into 

position.
If the carburetor box cover is 
removed, the shutter can be turned 
to the required position by hand.

Heated air is now drawn in from around 
the cylinder and mixed with cold air – 
this helps prevent carburetror icing.

:

At temperatures above +68 °F
(+20 °C): Turn the shutter back to 
the summer position (

s). 

This is essential to avoid engine 
running problems and overheating. 

It is advisable to fit the cover plate 
(special accessory) on the fan cover in 
extremely cold conditions (temperatures 
below -10 °C, in powder or drifting 
snow).

The cover plate partially blanks off the 
slots in the fan cover to help prevent 
snow being sucked into the machine.

When the cover plate is fitted, the 
shutter must be in the winter position.

:

If your saw is very cold (frost or ice 
on machine), start the engine and 
keep it at a high idle speed (with 
chain brake disengaged) until it 
reaches normal operating 
temperature.

In the event of engine running problems, 
first check that conditions for use of the 
cover plate still apply.

If engine idle speed is erratic or 
acceleration is poor

:

Turn low speed screw (L) 1/4 turn 
counterclockwise.

It is usually necessary to change the 
setting of the idle speed screw (LA) 
after making adjustments to the the low 
speed screw (L) – see “Adjusting the 
Carburetor”.

Full-time professional 
users:

every 3 
months

Semi-professional 
users (in agriculture 
and construction):

every 6 
months

Hobby and
occasional users:

every 12 
months

146BA000 KN