Stihl BT 120 C User manual

Instruction Manual
Manual de instrucciones
Warning!
For safe operation follow all safety
precautions in Instruction Manual - improper
use can cause serious injury.
Advertencia!
Para su seguridad durante el manejo de este
producto, siga siempre las precauciones de
seguridad dadas en el manual de
instrucciones - el uso indebido puede causar
lesiones graves.
STIH)
STIHL BT 120 C
BA_BT120_30_U_L3.book Seite 0 Freitag, 7. November 2003 8:10 08

1BT 120 C
English / USA
Printing inks contain vegetable oils; paper can be recycled.
Printed on chlorine-free paper.© ANDREAS STIHL AG & Co. KG, 2003
0458 427 3021. M1. L3. T. Printed in Germany
STIHl
Contents
Guide to Using this Manual .............. 2
Safety Precautions and
Working Techniques ......................... 3
Assembling the Machine ................ 10
Adjusting the Throttle Cable* .......... 11
Fuel ................................................ 11
Fueling ............................................ 12
Auger Brake ................................... 13
Fitting the Auger ............................. 14
Starting / Stopping the Engine ........ 14
Operating Instructions .................... 17
Releasing a Trapped Auger ............ 18
Cleaning the Air Filter ..................... 18
Motor Management ........................ 19
Adjusting the Carburetor ................ 19
Checking the Spark Plug ................ 21
Engine Running Behavior ............... 22
Lubricating the Gearbox ................. 23
Replacing Starter Rope
and Rewind Spring ......................... 23
Storing the Machine ........................ 25
Maintenance Chart ......................... 26
Parts and Controls .......................... 27
Specifications ................................. 28
Maintenance and Repairs ............... 30
STIHL Incorporated Federal and
California Emission Control
Warranty Statement ........................ 31
* see "Guide to Using this Manual"
Allow only persons who understand this
manual to operate your earth auger.
To receive maximum performance and
satisfaction from your STIHL earth
auger, it is important that you read and
understand
the maintenance and safety
precautions
, starting on page 3, before
using your earth auger.
Contact your STIHL dealer or the STIHL
distributor for your area if you do not
understand any of the instructions in this
manual.
!Warning!
Because an earth auger is a high-
torque, gasoline-powered tool, some
special safety precautions must be
observed to reduce the risk of personal
injury.
Careless or improper use may cause
serious or even fatal injury.

2
English / USA
BT 120 C
Pictograms
All the pictograms attached to the
machine are shown and explained in
this manual.
The operating and handling instructions
are supported by illustrations.
Symbols in text
The individual steps or procedures
described in the manual may be marked
in different ways:
:Step or procedure without direct
reference to an illustration.
Description of step or procedure that
refers directly to the illustration and
contains item numbers that appear in
the illustration.
Example:
Loosen the screw (1)
Lever (2) ...
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.
Warning where there is a risk of
damaging the machine or 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 refers to
several models with different
features. Components that are not
installed in all models and related
applications are marked thus *.
Such components are 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, we cannot be responsible for
changes, modifications or
improvements not covered in this
manual.
Guide to Using this Manual

3BT 120 C
English / USA
Warning!
Because an earth auger is
a high-torque, gasoline-
powered tool, some
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 and
understand the owner's
manual and the safety instructions.
Careless or improper use of any earth
auger may cause serious or fatal injury.
!Warning!
Do not lend or rent your earth auger
without the owner's manual. Be sure that
anyone using your earth auger
understands the information contained
in this manual.
Have your STIHL dealer show you how
to operate your earth auger. Observe all
applicable local safety regulations,
standards and ordinances.
Danger!
Drilling into or contact with
electrical wires may
cause severe shock,
burns or death. See
"Working Conditions"
below.
!Warning!
Striking a hard object in the earth with
the turning auger and the resulting
slowing or stopping of the auger creates
reactive forces. The transfer of rotational
(reactive) forces can cause the auger
powerhead and handles to rotate
suddenly in a counterclockwise direction
and can result in loss of control or cause
the handle frame to hit the operator or
throw him to the ground, resulting in
serious injury.
!Warning!
Minors should never be allowed to use
an earth auger. Bystanders, especially
children, and animals should not be
allowed in the area where an earth
auger is in use. Never let the earth auger
run unattended.
See the appropriate section of your
owner's manual for a description of the
controls and function of the parts of your
earth auger.
Most of these safety precautions and
warnings apply to the use of all STIHL
earth augers. Different models may
have different parts and controls. See
the appropriate section of your owner's
manual for a description of the controls
and function of the parts of your model
earth auger.
Safe use of an earth auger involves
1. the operator
2. the earth auger
3. the use of the earth auger.
THE OPERATOR
Physical Condition
You must be in good physical condition
and mental health and not under the
influence of any substance (drugs,
alcohol, etc.) which might impair vision,
dexterity or judgment. Do not operate an
earth auger when you are fatigued. Be
alert - if you get tired while operating
your earth auger, take a break.
Tiredness may result in loss of control.
Safety Precautions and
Working Techniques

4
English / USA
BT 120 C
Working with any earth auger can be
strenuous. If you have any condition that
might be aggravated by strenuous work,
check with your doctor before operating
an earth auger.
!Warning!
Prolonged use of earth augers (or other
machines) exposing the operator to
vibrations may produce whitefinger
disease (Raynaud 's phenomenon) or
carpal tunnel syndrome. These
conditions reduce the hand's ability to
feel and regulate temperature, produce
numbness and burning sensations and
may cause nerve and circulation
damage and tissue necrosis.
All the factors which contribute to
whitefinger disease are not known, but
cold weather, smoking and diseases or
physical conditions that affect blood
vessels and blood transport, as well as
high vibration levels and long periods of
exposure to vibration are mentioned as
factors in the development of whitefinger
disease. In order to reduce the risk of
whitefinger disease and carpal tunnel
syndrome, please note the following:
– Wear gloves and keep your hands
warm.
– Maintain a firm grip at all times, but
do not squeeze the handles with
constant, excessive pressure.
– Take frequent breaks.
All the above-mentioned precautions do
not guarantee that you will not sustain
whitefinger disease or carpal tunnel
syndrome. Therefore, continual and
regular users should monitor closely the
condition of their hands and fingers. If
any of the above symptoms appear,
seek medical advice immediately.
!Warning!
The ignition system of your unit
produces an electromagnetic field of a
very low intensity. This field may inter-
fere with some pacemakers. To reduce
the risk of serious or fatal injury, persons
with a pacemaker should consult their
physician and the pacemaker manu-
facturer before operating this tool.
Proper Clothing
!Warning!
To reduce the risk of injury, the operator
should wear proper protective apparel.
Clothing must be sturdy
and snug-fitting, but allow
complete freedom of
movement. Avoid loose-
fitting jackets, flared or
cuffed pants or anything
that could be drawn into the boring tool.
Wear overalls or long pants to protect
your legs. Secure hair so it is above
shoulder level. Do not wear shorts. Use
gloves when handling the earth auger.
To reduce the risk of
falling as a result of the
forces created by the
earth auger, good footing
is most important. Wear
sturdy footwear with
nonslip soles. Steel-toed safety boots
are recommended.