Stihl BT 131 User Manual
STIHL BT 131
WARNING
Read Instruction Manual thoroughly
before use and follow all safety
precautions – improper use can
cause serious or fatal injury.
ADVERTENCIA
Antes de usar la máquina lea y siga
todas las precauciones de
seguridad dadas en el manual de
instrucciones – el uso incorrecto
puede causar lesiones graves o
mortales.
{
Instruction Manual
Manual de instrucciones
Instruction Manual
1 - 30
Manual de instrucciones
31 - 64
Contents
English
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 2
Assembling the Unit 10
Adjusting the Throttle Cable 11
Fuel 11
Fueling 12
Auger Brake 13
Original Instruction ManualPrinted on chlorine-free paper
Fitting the Auger 14
Starting / Stopping the Engine 14
Operating Instructions 16
Releasing a Trapped Auger 17
Replacing the Air Filter 17
Engine Management 18
Adjusting the Carburetor 18
Spark Arresting Screen in Muffler 19
Spark Plug 19
Engine Running Behavior 20
Lubricating the Gearbox 21
Storing the Machine 21
Maintenance and Care 22
Main Parts 24
Printing inks contain vegetable oils, paper can be recycled.
Specifications 25
Maintenance and Repairs 26
Disposal 27
STIHL Incorporated Federal
Emission Control Warranty
Statement 27
Trademarks 29
Allow only persons who fully 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,
understand and follow the safety
precautions and the operating and
maintenance instructions in chapter
"Safety Precautions and Working
Techniques" before using your earth
auger. For further information you can
go to www.stihlusa.com
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 hightorque, 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.
{
© ANDREAS STIHL AG & Co. KG, 2016
0458-529-8621-A. VA0.G16.
0000007446_001_GB
BT 131
This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
1
English
Guide to Using this Manual
Pictograms
The meanings of the pictograms
attached to or embossed on the
machine are explained in this manual.
Depending on the model concerned, the
following pictograms may be on your
machine.
Fuel tank for gasoline
and engine oil mixture
Press to operate manual
fuel pump
Auger brake
Symbols in Text
Many operating and safety instructions
are supported by illustrations.
The individual steps or procedures
described in the manual may be marked
in different ways:
N A bullet marks a step or procedure.
A description of a step or procedure that
refers directly to an illustration may
contain item numbers that appear in the
illustration. Example:
N Loosen the screw (1).
N 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 and signal words described
below:
DANGER
Indicates a hazardous situation that, if
not avoided, will result in death or
serious injury.
WARNING
Indicates a hazardous situation that, if
not avoided, could result in death or
serious injury.
NOTICE
Indicates a risk of property damage,
including damage to the machine or its
individual components.
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. Therefore,
some changes, modifications and
improvements may not be covered in
this manual. If the operating
characteristics or the appearance of
your machine differs from those
described in this manual, please contact
your STIHL dealer or the STIHL
distributor for your area for assistance.
Safety Precautions and
Working Techniques
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 the
instruction manual and
the safety precautions
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 federal, state and local safety
regulations, standards and ordinances.
DANGER
Drilling into or contact
with electrical wires may
cause severe shock,
burns or death. See the
section "Working Conditions" below.
WARNING
Striking a hard object in the earth with
the turning drill 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
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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
Do not lend or rent your power tool
without the instruction manual. Be sure
that anyone using it understands the
information contained in this manual.
WARNING
The use of this machine may be
hazardous. If the drilling tool comes in
contact with your body, it could cause
impact or cut injuries.
Use your earth auger only for drilling
holes in soil (with earth auger
attachments) or ice (with ice auger
attachments).
WARNING
Do not use it for other purposes, since
misuse may result in personal injury or
property damage, including damage to
the machine.
not in use (e.g. during a work break),
shut it off and make sure that
unauthorized persons do not use it.
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
instruction manual for a description of
the controls and the function of the parts
of your model.
Safe use of an earth auger involves
1 the operator
2 the power tool
3 the use of the power tool.
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
this machine when you are fatigued.
WARNING
Prolonged use of a power tool (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 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:
WARNING
Minors should never be allowed to use
this power tool. Bystanders, especially
children, and animals should not be
allowed in the area where it is in use.
WARNING
To reduce the risk of injury to bystanders
and damage to property, never let your
power tool run unattended. When it is
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WARNING
Be alert – if you get tired, take a break.
Tiredness may result in loss of control.
Working with any power tool can be
strenuous. If you have any condition that
might be aggravated by strenuous work,
check with your doctor before operating
this power tool.
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Most STIHL power tools are available
with an anti-vibration ("AV") system
designed to reduce the transmission of
vibrations created by the machine to the
operator's hands. An AV system is
recommended for those persons using
power tools on a regular or sustained
basis.
– Wear gloves and keep your hands
warm.
– Keep the AV system well
maintained. A power tool with loose
components or with damaged or
worn AV elements will tend to have
higher vibration levels.
– 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 closely monitor the
condition of their hands and fingers. If
any of the above symptoms appear,
seek medical advice immediately.
WARNING
The ignition system of the STIHL unit
produces an electromagnetic field of a
very low intensity. This field may
interfere with some pacemakers. To
reduce the risk of serious or fatal injury,
persons with a pacemaker should
consult their physician and the
pacemaker manufacturer before
operating this tool.
Proper Clothing
WARNING
To reduce the risk of injury, the operator
should wear proper protective apparel.
WARNING
To reduce the risk of
injury to your eyes never
operate your power tool
unless wearing goggles
or properly fitted protective glasses with
adequate top and side
protection complying with
ANSI Z87 "+" (or your
applicable national
standard).
Power tool noise may
damage your hearing.
Wear sound barriers (ear
plugs or ear mufflers) to
protect your hearing.
Continual and regular
users should have their
hearing checked
regularly.
Be particularly alert and cautious when
wearing hearing protection because
your ability to hear warnings (shouts,
alarms, etc.) is restricted.
Clothing must be sturdy
and snug-fitting, but allow
complete freedom of
movement. Wear overalls
or long pants made of
heavy material to help
protect your legs. Do not
wear shorts, sandals or
go barefoot.
Avoid loose-fitting jackets, scarfs,
neckties, jewelry, flared or cuffed pants,
unconfined long hair or anything that
could be drawn into the drilling tool.
Secure hair so it is above shoulder level.
Good footing is very
important. Wear sturdy
boots with nonslip soles.
Steel-toed safety boots
are recommended.
Wear an approved safety
hard hat to reduce the
risk of injury to your head
when there is a danger of
head injuries.
Always wear heavy duty
work gloves (e.g. made of
leather or other wear
resistant material) when
handling the machine
and the drilling tool.
Heavy-duty, nonslip
gloves improve your grip
and help to protect your
hands.
THE POWER TOOL
For illustrations and definitions of the
power tool parts see the chapter on
"Main Parts."
WARNING
Never modify this power tool in any way.
Only attachments supplied by STIHL or
expressly approved by STIHL for use
with the specific STIHL model are
authorized. Although certain
unauthorized attachments, drills and
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augers are useable with STIHL power
tools, their use may, in fact, be
extremely dangerous.
If this tool is subjected to unusually high
loads for which it was not designed (e.g.
heavy impact or a fall), always check
that it is in good condition before
continuing work. Check in particular that
the fuel system is tight (no leaks) and
that the controls and safety devices are
working properly. Do not continue
operating this machine if it is damaged.
In case of doubt, have it checked by your
STIHL servicing dealer.
THE USE OF THE POWER TOOL
Transporting the Power Tool
WARNING
Always shut off the engine before putting
the earth auger down or carrying it.
Carrying an earth auger with the engine
running is dangerous. Accidental
acceleration of the engine can cause the
drilling tool to rotate.
WARNING
During operation, the powerhead muffler
and the parts around it reach extremely
high temperatures. Avoid setting down a
hot unit onto dry, flammable material, or
touching the hot muffler; you could
receive serious burns.
Carry the unit by the handle frame with
hot parts of the machine (e.g., gearbox)
away from your body.
Remove the auger before transporting
the power tool long distances.
When transporting in a vehicle, properly
secure your power tool to prevent
turnover, fuel spillage and damage.
When the power tool is not in use, shut it
off and put it down so it cannot endanger
others.
Fuel
Your STIHL power tool uses an oil-
gasoline mixture for fuel (see the
chapter on "Fuel" of your instruction
manual).
WARNING
Gasoline is an extremely
flammable fuel. If spilled
and ignited by a spark or
other ignition source, it
can cause fire and serious burn injury or
property damage. Use
extreme caution when
handling gasoline or fuel
mix. Do not smoke or
bring any fire or flame
near the fuel or the power
tool. Note that combustible fuel vapor may
escape from the fuel
system.
Fueling Instructions
WARNING
Fuel your power tool in well-ventilated
areas, outdoors. Always shut off the
engine and allow it to cool before
refueling. Gasoline vapor pressure may
build up inside the fuel tank depending
on the fuel used, the weather conditions
and the tank venting system.
In order to reduce the risk of burns and
other personal injury from escaping gas
vapor and fumes, remove the fuel filler
cap on your power tool carefully so as to
allow any pressure build-up in the tank
to release slowly. Never remove the fuel
filler cap while the engine is running.
Select bare ground for fueling and move
at least 10 feet (3 m) from the fueling
spot before starting the engine. Wipe off
any spilled fuel before starting your
machine.
WARNING
Check for fuel leakage
while refueling and during
operation. If fuel leakage
is found, do not start or
run the engine until the
leak is fixed and any
spilled fuel has been
wiped away. Take care
not to get fuel on your
clothing. If this happens,
change your clothing
immediately.
Screw Cap
WARNING
Unit vibrations can cause
an improperly tightened
fuel filler cap to loosen or
come off and spill quantities of fuel. In order to
reduce the risk of fuel
spillage and fire, tighten
the fuel filler cap by hand
as securely as possible.
See "Fueling" chapter in your instruction
manual.
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Before Starting
WARNING
Always check your power tool for proper
condition and operation before starting,
particularly the throttle trigger, throttle
trigger lockout, stop switch, drilling tool
and auger brake. The throttle trigger
must move freely and always spring
back to the idle position. Never attempt
to modify the controls or safety devices.
Regular maintenance is important in this
respect. Make sure the drilling tool is in
good condition and properly connected.
WARNING
Check fuel system for leaks, especially
the visible parts, e.g., filler cap, hose
connections, manual fuel pump (only for
power tools equipped with a manual fuel
pump). Do not start the engine if there
are leaks or damage – risk of fire! Have
the machine repaired by a servicing
dealer before using it.
WARNING
Never operate your power tool if it is
damaged, improperly adjusted or
maintained, or not completely or
securely assembled.
WARNING
Check that the spark plug boot is
securely mounted on the spark plug – a
loose boot may cause arcing that could
ignite combustible fumes and cause a
fire.
Keep the handles clean and dry at all
times; it is particularly important to keep
them free of moisture, pitch, oil, fuel mix,
grease or resin in order for you to
maintain a firm grip and properly control
your power tool.
Auger Brake
Your earth auger model is equipped with
an auger brake, which is designed to
reduce the risk of injury from reactive
forces by stopping the rotation of the
auger / powerhead when the brake
activating lever is engaged. It should
also be used during starting and when
unwinding a trapped auger. See the
chapter on "Auger Brake" for information
on engagement of the brake.
Starting
Start the engine at least 10 feet (3 m)
from the fueling spot, outdoors only.
For specific starting instructions, see the
appropriate section of your manual.
Place the power tool on firm ground or
other solid surface in an open area.
Maintain good balance and secure
footing.
WARNING
Your earth auger should be started only
when it is held steady by the operator.
WARNING
To reduce the risk of loss of control, be
sure that the auger brake is engaged.
When the engine starts at starting
throttle, engine speed will be fast
enough for the clutch to engage and, if
the auger brake is not engaged, turn the
drilling tool.
Once the engine has started,
immediately blip the throttle trigger,
which should release the starting throttle
and allow the engine to slow down to idle
speed.
WARNING
Your power tool is a one-person
machine. Do not allow other persons in
the general work area, even when
starting.
WARNING
When you pull the starter grip, do not
wrap the starter rope around your hand.
Do not let the grip snap back, but guide
the starter rope to rewind it properly.
Failure to follow this procedure may
0000-GXX-1862-A0
result in injury to your hand or fingers
and may damage the starter
mechanism.
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9912BA000 KN
Important Adjustments
WARNING
To reduce the risk of personal injury
from loss of control or contact with the
turning drilling tool, do not use your unit
with incorrect idle adjustment. At correct
idle speed, the drilling tool should not
move. For directions on how to adjust
idle speed, see the appropriate section
of your instruction manual.
If you cannot set the correct idle speed,
have your STIHL dealer check your
power tool and make proper
adjustments and repairs.
During Operation
Holding and Controlling the Power Tool
Always hold the unit firmly with both
hands on the handles while you are
working. Wrap your fingers and thumbs
around the handles.
Keep your hands in this position to have
your earth auger under control at all
times.
Select drilling angle so that the auger
brake lever is always in a position to be
activated by the operator’s left thigh.
WARNING
Do not overreach. Keep proper footing
and balance at all times. Special care
must be taken in slippery conditions (wet
ground, snow, ice) and in difficult,
overgrown terrain. Watch for hidden
obstacles such as tree stumps, roots
and ditches to avoid stumbling. For
better footing, clear away fallen
branches, scrub and cuttings. Be
extremely cautious when working on
slopes or uneven ground or when
working with an ice auger attachment on
ice.
Working Conditions
Operate and start your power tool only
outdoors in a well ventilated area.
Operate it under good visibility and
daylight conditions only. Work carefully.
WARNING
As soon as the engine is
running, this product generates toxic exhaust
fumes containing chemicals, such as unburned
hydrocarbons (including
benzene) and carbon
monoxide, that are
known to cause respiratory problems, cancer,
birth defects, or other
reproductive harm. Some
of the gases (e.g. carbon
monoxide) may be colorless and odorless. To
reduce the risk of serious
or fatal injury/illness from
inhaling toxic fumes,
never run the machine
indoors or in poorly ventilated locations.
WARNING
Inhalation of certain dusts, especially
organic dusts such as mold or pollen,
can cause susceptible persons to have
an allergic or asthmatic reaction.
Substantial or repeated inhalation of
dust and other airborne contaminants, in
particular those with a smaller particle
size, may cause respiratory or other
illnesses. Control dust at the source
where possible. Use good work
practices, such as operating the unit so
that the wind or operating process
directs any dust raised by the power tool
away from the operator. Follow the
recommendations of
EPA/OSHA/NIOSH and occupational
and trade associations with respect to
dust ("particulate matter"). When the
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inhalation of dust cannot be
substantially controlled, i.e., kept at or
near the ambient (background) level, the
operator and any bystanders should
wear a respirator approved by
NIOSH/MSHA for the type of dust
encountered.
Striking something hard
in the earth, such as a
rock or gravel, may cause
the drilling tool to slow
down suddenly or stop. In
such a situation, some or
all of the rotational force
(reactive force) is transferred to the powerhead
and handle frame of the
earth auger which can
cause the auger powerhead and handles to
rotate suddenly in a
counterclockwise
direction.
WARNING
Work carefully in rocky ground or where
other solid objects may be present.
Keep throttle feed pressure to a
minimum. If you feel or hear the drilling
tool strike a solid object, release the
throttle trigger immediately and remove
the object before drilling is continued.
When drilling in heavy clay soil, bore
about 1/3 way and remove the auger
from the hole. Clean off auger drilling
tool then continue in slow steps
frequently clearing tool.
WARNING
You should hold your earth auger firmly
to control sudden jolts and reactive
forces. Be prepared to release the
throttle completely if the forces become
too great. If reactive forces are not
controlled, rotation of the handles may
result in severe jerking and loss of
control and may cause the handle frame
to strike you or throw you to the ground.
Your earth auger model is equipped with
an auger brake. If the auger hits
something it cannot drill through and the
powerhead begins to rotate so that the
auger brake activating lever strikes the
operator’s thigh and engages, the brake
is designed to stop the rotation of the
powerhead.
WARNING
In order to reduce the risk of serious or
fatal injury from reactive forces, never
operate your earth auger without a
properly functioning auger brake.
If the auger becomes trapped in the
drillhole, turn off the engine immediately
and remove as described in the chapter
entitled "Releasing a Trapped Auger."
DANGER
Contact with electrical
cables or wires can
cause serious injury or
death as a result of electrical shock. This unit is
not insulated.
WARNING
To reduce the risk of electrocution and
damage to property, always be alert for
underground pipes and cables and for
overhead wires. Before drilling, obtain
the necessary plans and permits.
Contact your local utility company or
your locator service, such as "Miss
Utility" or "One Call," for information as
to cable and pipe locations. Where
necessary, confirm actual location by
use of devices such as cable detectors
and/or by carefully dug trenches. Stay
clear of overhead electrical wires when
backing the drilling tool out of the hole. If
any portion of the machine strikes a
wire, it will cause electrical shock and
serious injury or death.
WARNING
Before working with an ice auger
attachment on frozen ponds, lakes or
streams, check with local authorities and
take all necessary precautions to ensure
safe ice thickness.
WARNING
Thrown objects may ricochet and strike
the operator.
Operating Instructions
WARNING
Do not operate your power tool using the
starting throttle lock, as you do not have
control of the engine speed.
In the event of an emergency, shut off
the engine immediately – press the stop
switch.
WARNING
When taking the drilling tool out of the
hole, lift the machine vertically so that
the tool comes out straight without
canting. To minimize splashing when
drilling ice holes, back off the throttle
when the drilling tool breaks through the
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ice. Raise the unit slowly. Cover and
clearly mark boreholes to prevent
anyone from stepping in a hole.
WARNING
To reduce the risk of injury, never touch
a drilling tool or drilling spindle with your
hand or any part of your body when the
engine is running or the drilling tool is
rotating. It continues to rotate for a short
period after the throttle trigger is
released. Always shut off the engine
before putting the machine down.
WARNING
Drilling tool blades and point are sharp.
To reduce the risk of cut injuries, use
caution when operating and handling.
MAINTENANCE, REPAIR AND
STORING
Maintenance, replacement, or repair of
the emission control devices and
systems may be performed by any
nonroad engine repair establishment or
individual. However, if you make a
warranty claim for a component which
has not been serviced or maintained
properly or if nonapproved replacement
parts were used, STIHL may deny
coverage.
WARNING
Use only identical STIHL replacement
parts for maintenance and repair. Use of
non-STIHL parts may cause serious or
fatal injury.
Strictly follow the maintenance and
repair instructions in the appropriate
section of your instruction manual.
Please refer to the maintenance chart
near the end of this manual.
WARNING
Always stop the engine before doing any
maintenance or repair work or cleaning
the power tool.
WARNING
Do not attempt any maintenance or
repair work not described in your
instruction manual. Have such work
performed by your STIHL servicing
dealer only.
WARNING
Never test the ignition system with the
spark plug boot removed from the spark
plug or with a removed spark plug, since
uncontained sparking may cause a fire.
WARNING
Use the specified spark plug and make
sure it and the ignition lead are always
clean and in good condition. Always
press spark plug boot snugly onto spark
plug terminal of the proper size. (Note: If
terminal has detachable SAE adapter
nut, it must be securely attached.) A
loose connection between spark plug
terminal and the ignition wire connector
in the boot may create arcing that could
ignite combustible fumes and cause a
fire.
WARNING
Check condition of drilling tool at regular
short intervals. If behavior of tool
changes, check immediately for
tightness or any signs of cracks in
particular.
WARNING
Wear gloves when handling or
performing maintenance on auger
drilling tools.
WARNING
Replace damaged drilling tools
immediately, even if they have only
superficial cracks. Never attempt to
repair damaged drilling tools.
WARNING
Do not operate your power tool if the
muffler is damaged, missing or modified.
An improperly maintained muffler will
increase the risk of fire and hearing loss.
Your muffler is equipped with a sparkarresting screen to reduce the risk of
fire; never operate your power tool if the
screen is missing, damaged or clogged.
Remember that the risk of a brush or
forest fire is greater in hot or dry
weather.
In California, it is a violation of § 4442 or
§ 4443 of the Public Resources Code to
use or operate gasoline-powered tools
on forest-covered, brush-covered or
grass-covered land unless the engine’s
exhaust system is equipped with a
complying spark arrester that is
maintained in effective working order.
The owner/operator of this product is
responsible for properly maintaining the
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3
2
3
1
9912BA001 KN
9912BA002 KN
3
3
9912BA003 KN
spark arrester. Other states or
governmental entities/agencies, such as
the U.S. Forest Service, may have
similar requirements. Contact your local
fire agency or forest service for the laws
or regulations relating to fire protection
requirements.
Tighten all nuts, bolts and screws except
the carburetor adjustment screws after
each use.
For any maintenance of the emission
control system please refer to the
maintenance chart and to the limited
warranty statement near the end of the
instruction manual.
Do not clean your machine with a
pressure washer. The solid jet of water
may damage parts of the machine.
Store your power tool in a dry and locked
location out of reach of children. Before
storing for longer than a few days,
always empty the fuel tank (see chapter
"Storing the Machine" in the instruction
manual).
Assembling the Unit
Fitting activating lever for auger brake
N Insert the activating lever (1) into
the clamp
N Place the holder (2) onto the
activating lever
N Screw in the fastening screws (3)
and tighten
Fit the padding
N Hook the padding (1) with the
tabs (2) into the oblong holes in the
handle frame
N Fold up the padding
N Secure the padding to the
handlebar with the cling strips (3) –
do not jam the throttle cable
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0000-GXX-2145-A0
Adjusting the Throttle Cable
It may be necessary to correct the
adjustment of the throttle cable after
assembling the machine or after a
prolonged period of operation.
Adjust the throttle cable only when the
machine is completely and properly
assembled.
N Set the throttle trigger to the full
throttle position.
N Rotate the screw in the throttle
trigger clockwise until you feel initial
resistance. Then rotate it another
half turn in the same direction.
Fuel
This engine is certified to operate on
unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of 50:1.
Your engine requires a mixture of highquality gasoline and two-stroke air
cooled engine oil.
Use mid-grade unleaded gasoline with a
minimum octane rating of 89 ((R+M)/2)
and no more than 10% ethanol content.
NOTICE
Fuel with an octane rating below 89 may
increase engine temperatures. This, in
turn, increases the risk of piston seizure
and damage to the engine.
The chemical composition of the fuel is
also important. Some fuel additives not
only detrimentally affect elastomers
(carburetor diaphragms, oil seals, fuel
lines, etc.), but magnesium castings and
catalytic converters as well. This could
cause running problems or damage the
engine. For this reason STIHL
recommends that you use only quality
unleaded gasoline!
NOTICE
Gasoline with an ethanol content of
more than 10% can cause running
problems and major damage in engines
and should not be used.
For further details, see
www.STIHLusa.com/ethanol
The ethanol content in gasoline affects
engine speed – it may be necessary to
readjust the carburetor if you use fuels
with various ethanol contents.
WARNING
To reduce the risk of personal injury
from loss of control and/or contact with
the running cutting tool, do not use your
unit with an incorrect idle adjustment. At
correct idle speed, the cutting tool
should not move.
If your machine’s idle speed is
incorrectly adjusted, have your
authorized STIHL servicing dealer
check your machine and make the
proper adjustments and repairs.
The idle speed and maximum speed of
the engine change if you switch from a
fuel with a certain ethanol content to a
fuel with a much higher or lower ethanol
content.
This problem can be avoided by always
using fuel with the same ethanol
content.
To ensure the maximum performance of
your STIHL engine, use a high quality 2cycle engine oil. To help your engine run
cleaner and reduce harmful carbon
deposits, STIHL recommends using
STIHL HP Ultra 2-cycle engine oil or ask
your dealer for an equivalent fully
synthetic 2-cycle engine oil.
To meet the requirements of EPA and
CARB we recommend to use STIHL HP
Ultra oil.
STIHL MotoMix
STIHL recommends the use of STIHL
MotoMix. STIHL MotoMix has a high
octane rating and ensures that you
always use the right gasoline/oil mix
ratio.
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0000-GXX-0476-A0
STIHL MotoMix uses STIHL HP Ultra
two-stroke engine oil suited for high
performance engines.
For further details, see
www.STIHLusa.com/ethanol
If not using MotoMix, use only STIHL
two-stroke engine oil or equivalent highquality two-stroke engine oils that are
designed for use in air cooled two-cycle
engines.
The use of non-seasonal gasoline
blends may increase the potential for
pressure to build in the fuel tank during
operation. For example, using a winder
blend during the summer will increase
pressure in the fuel tank. Always use
gasoline blends appropriate to the
season, altitude and other
environmental factors.
Do not use BIA or TCW rated (twostroke water cooled) mix oils or other
mix oils that state they are for use in both
water cooled and air cooled engines
(e.g., outboard motors, snowmobiles,
chain saws, mopeds, etc.).
WARNING
Take care when handling gasoline.
Avoid direct contact with the skin and
avoid inhaling fuel vapor. When filling at
the pump, first remove the container
from your vehicle and place the
container on the ground before filling. To
reduce the risk of sparks from static
discharge and resulting fire and/or
explosion, do not fill fuel containers that
are sitting in or on a vehicle or trailer.
The container should be kept tightly
closed in order to limit the amount of
moisture that gets into the mixture.
The machine‘s fuel tank should be
cleaned as necessary.
Fuel mix ages
If not using MotoMix, only mix sufficient
fuel for a few days of work, not to exceed
30 days of storage. Store in approved
fuel-containers only. When mixing, pour
oil into the container first, and then add
gasoline. Close the container and shake
it vigorously by hand to ensure proper
mix of oil and gasoline.
Gasoline
Oil (STIHL 50:1 or equivalent high-quality oils)
US gal. US fl.oz.
12.6
2 1/2 6.4
5 12.8
Dispose of empty mixing-oil containers
only at authorized disposal locations.
Fueling
Preparations
N Before fueling, clean the filler cap
and the area around it to ensure that
no dirt falls into the tank.
Always thoroughly shake the mixture in
the canister before fueling your
machine.
N Position the machine so that the
filler cap is facing up.
WARNING
To reduce the risk of fire and personal
injuries due to escaping fuel and vapor,
remove the fuel filler cap carefully so
that any excess pressure in the tank can
escape slowly.
Use the proper seasonal gasoline blend,
i.e., winter blend in winter, summer
blend in summer.
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002BA447 KN
002BA448 KN
Opening the threaded filler cap
N Turn the cap counterclockwise until
it can be removed from the tank
opening.
N Remove the filler cap.
Refueling
Take care not to spill fuel while fueling
and do not overfill the tank.
Closing the threaded filler cap
N Position cap.
N Turn the cap clockwise as far as it
will go and tighten it as securely as
possible by hand.
Auger Brake
Engaging the Auger Brake
A
N Move the activating lever to
position A .
– when starting
– at idling speed
– to unwind a trapped auger
If the auger snags on an obstacle in the
hole (e.g. roots or stones) the machine
will begin to turn counterclockwise – the
activating lever is pressed against the
operator's thigh and thus engages the
auger brake.
Disengaging the Auger Brake
B
0000-GXX-1861-A0
N Move the activating lever to
position B
0000-GXX-1860-A0
Checking Operation of Auger Brake
The auger brake is subject to normal
wear and tear. Regularly check that it is
operating properly before you start work
and after releasing a trapped auger.
Before starting work and after releasing
a trapped auger
N With the engine running at idle
speed, engage the auger brake and
then open the throttle wide for no
more than 3 seconds – the auger
must not rotate.
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9912BA010 KN
1
2
3
3
2
1
3
0000-GXX-0477-A0
If the auger brake fails, have it repaired
immediately by your dealer – STIHL
recommends that this work be
performed by a STIHL servicing dealer.
Fitting the Auger
N Shut off the engine and engage the
auger brake – see "Auger Brake".
N Put the machine down.
N Pull the retaining pin (1) out of the
auger's shank.
N Push the auger (2) onto the drilling
spindle so that the holes (3) line up.
N Push the retaining pin into the hole.
N Spring clip on the retaining pin must
fit snugly around the auger's shank.
Starting / Stopping the
Engine
Engaging the Auger Brake
A
0000-GXX-1860-A0
N Move the activating lever to
position A .
Controls
14
1 Throttle trigger lockout
2 Throttle trigger
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3 Stop switch with Run and Stop
positions. Depress the stop switch
(…) to switch off the ignition – see
"Function of stop switch and ignition
system".
Function of stop switch and ignition
system
The stop switch is normally in the Run
position, i.e. when it is not depressed:
The ignition is switched on – the engine
is ready to start. Operate the stop switch
to switch off the ignition. The ignition is
switched on again automatically after
the engine stops.
Starting the Engine
N Press home the choke knob (8) and
turn it to the required position – it
must engage
g if the engine is cold
< for warm start – also use this posi-
tion if the engine has been running
but is still cold.
Cranking
N Left hand on the handle frame – do
not touch the throttle trigger or
lockout lever – your thumb should
be under the fan housing.
N Hold the starter grip with your right
hand.
N Pull the starter grip slowly until you
feel it engage and then give it a brisk
strong pull.
NOTICE
Do not pull out the starter rope all the
way – it might otherwise break.
N Do not let the starter grip snap back.
Guide it slowly back into the housing
so that the starter rope can rewind
properly.
N Continue cranking until the engine
runs.
As soon as the engine runs
N Press the manual fuel pump
bulb (9) at least five times – even if
the bulb is already filled with fuel.
BT 131
N Place the unit on the ground:
To reduce the risk of accidents, check
that the cutting attachment is not
touching the ground or any other
obstacles.
N Make sure you have a safe and
secure footing.
N Put your left foot on the handle
frame.
0000-GXX-1862-A0
0000-GXX-1558-A0
N Depress throttle trigger lockout and
immediately blip the throttle trigger –
the choke knob moves to the run F
position.
NOTICE
Since the auger brake is still engaged,
the engine must be returned to idling
speed immediately – or the clutch might
otherwise be damaged.
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English
B
N Stand the machine on the tip of the
auger.
N Disengage the auger brake by
moving the activating lever to
position B. Your earth auger is now
ready for operation.
WARNING
Make sure the carburetor is correctly
adjusted. The auger must not rotate
when the engine is idling.
Your machine is now ready for
operation.
Stopping the Engine
N Depress the momentary contact
stop switch – the engine stops –
release the stop switch – it springs
back to the run position.
Other Hints on Starting
Engine stalls in cold start position g or
under acceleration.
N Move the choke knob to < and
continue cranking until the engine
runs.
Engine does not start in warm start
position <
N Move the choke knob to g and
continue cranking until the engine
runs.
If the engine does not start
N Check that all settings are correct.
N Check that there is fuel in the tank
0000-GXX-1861-A0
and refuel if necessary.
N Check that the spark plug boot is
properly connected.
N Repeat the starting procedure.
Engine is flooded
N Move the choke knob to F and
continue cranking until the engine
runs.
Fuel tank run until completely dry
N After refueling, press the manual
fuel pump bulb at least five times –
even if the bulb is already filled with
fuel.
N Set the choke knob to suit the
engine temperature.
N Now start the engine.
Operating Instructions
During break-in period
A factory-new machine should not be
run at high revs (full throttle off load) for
the first three tank fillings. This avoids
unnecessary high loads during the
break-in period. As all moving parts
have to bed in during the break-in
period, the frictional resistances in the
engine are greater during this period.
The engine develops its maximum
power after about 5 to 15 tank fillings.
During Operation
After a long period of full throttle
operation, allow the engine to run for a
short while at idle speed so that engine
heat can be dissipated by the flow of
cooling air. This protects enginemounted components (ignition,
carburetor) from thermal overload.
After Finishing Work
Wait for the engine to cool down. Drain
the fuel tank. Store the machine in a dry
location. Check the tightness of all
accessible screws and nuts (not
adjusting screws) at regular intervals
and retighten if necessary.
Working with shaft extension (special
accessory)
Do not fit the sha ft extension until the full
length of the auger is in the hole.
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0000-GXX-1860-A0
A
1
1
0000-GXX-0482-A0
2
3
4
WARNING
Starting a hole with the shaft extension
fitted increases the risk of personal
injury because the unit is then at chest
height and cannot be controlled
properly. For the same reason the shaft
extension must be removed before the
auger is pulled out of the hole.
Releasing a Trapped Auger
If the auger jams in the drill hole
N Shut off the engine immediately.
N Depress the momentary contact
stop switch – the engine stops –
release the stop switch – it springs
back to the run position.
N Engage the auger brake by moving
the activating lever to position A.
N Rotate the whole machine
counterclockwise to unwind the
auger from the ground.
N After releasing the trapped auger,
check operation of the auger brake
– see “Auger Brake”.
Replacing the Air Filter
Filters have an average life of more than
a year. Do not remove the filter cover or
replace the air filter as long as there is no
noticeable loss of power.
If there is a noticeable loss of engine
power.
N Remove padding from the handle
frame.
N Turn the choke knob to g.
N Take out the screws (1).
N Remove the filter cover (2).
N Clean away loose dirt from around
the filter.
N Remove the filter element (3).
N Replace dirty or damaged filter.
N Replace any damaged parts.
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Installing the Filter Element
N Install the filter element in the filter
housing and fit the cover.
N Fit the screws and tighten them
down firmly.
N Fit the padding – see "Assembling
the Unit".
Engine Management Adjusting the Carburetor
Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components (e.g.
carburation, ignition, timing and valve or
port timing) without the addition of any
major hardware.
The carburetor has been set at the
factory to provide an optimum fuel-air
mixture under most operating
conditions.
Adjusting Idle Speed
Engine stops while idling
N Warm up the engine for about
3 minutes.
N Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly – the auger must not
rotate.
Auger rotates when engine is idling
N Turn the idle speed screw (LA)
slowly counterclockwise until the
auger stops rotating and then turn
the screw about another 1/2 to 3/4
turn in the same direction.
18
WARNING
If the auger continues to rotate when the
engine is idling, have your machine
checked and repaired by your servicing
dealer.
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4
5
000BA039 KN
A
Spark Arresting Screen in
Muffler
N If the engine is down on power,
check the spark arresting screen in
the muffler.
N Wait for the muffler to cool down.
N Take out the screw (4).
N Lift the spark arresting screen (5)
and pull it out.
N Clean the spark arresting
screen (5). If the screen is damaged
or heavily carbonized, install a new
one.
N Refit the spark arresting screen (5).
N Insert the screw (4) and tighten it
down firmly.
Spark Plug
If the engine is down on power, difficult
to start or runs poorly at idling speed,
first check the spark plug.
Install a new spark plug after approx.
100 operating hours or earlier if the
electrodes are badly eroded/corroded.
The wrong fuel mix (too much engine oil
in the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition
of the spark plug. These factors cause
deposits to form on the insulator nose
which may degrade performance.
Removing the Spark Plug
1
2
3
N Remove the cover (1).
N Pull off the spark plug boot (2).
N Unscrew the spark plug (3).
Checking the Spark Plug
N Clean dirty spark plug.
N Check electrode gap (A) and
readjust if necessary – see chapter
"Specifications."
N Use only resistor type spark plugs of
the approved range.
Rectify problems which have caused
fouling of spark plug:
– too much oil in fuel mix,
– dirty air filter,
– unfavorable running conditions, e.g.
operating at part load.
0000-GXX 0537-A0
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