3KM 55
English / USA
In addition to the operating instructions, 
this manual may contain paragraphs 
that require your special attention. Such 
paragraphs are marked with the 
symbols described below:
Warning where there is a risk of an 
accident or personal injury or 
serious damage to property.
Caution where there is a risk of 
damaging the machine or its 
individual components.
Note or hint which is not essential 
for using the machine, but may 
improve the operator’s under-
standing of the situation and result 
in better use of the machine.
Note or hint on correct procedure in 
order to avoid damage to the 
environment.
Equipment and features
This instruction manual may refer to 
several models with different 
features. Components that are not 
installed on all models and related 
applications are marked with an 
asterisk (*).  Such components may 
be available as special accessories 
from your STIHL dealer.
Engineering improvements
STIHL’s philosophy is to continually 
improve all of its products. As a result, 
engineering changes and improvements 
are made from time to time. If the 
operating characteristics or the 
appearance of your machine differ from 
those described in this manual, please 
contact your STIHL dealer for 
assistance.
Therefore some changes, modifications 
and improvements may not be covered 
in this manual.
Because this 
KombiEngine is the 
engine for a high-speed,  
power tool, special safety 
precautions must be 
observed to reduce the 
risk of personal injury.
It is important that you 
read, fully understand and 
observe the following 
safety precautions and 
warnings. Read the 
instruction manuals and 
the safety precautions of your 
KombiEngine and KombiTool 
periodically. Careless or improper use 
may cause serious or fatal injury.
Have your STIHL dealer show you how 
to operate your power tool. Observe all 
applicable local safety regulations, 
standards and ordinances.
!Warning!
Do not lend or rent your power tool 
without the instruction manuals. Be sure 
that anyone using it understands the 
information contained in these manuals.
Safety Precautions and 
Working Techniques