Stihl BT 121 - User Manual

Instruction Manual
Manual de instrucciones
Warning!
Read and follow all safety precautions in
Instruction Manual – improper use can cause
serious or fatal injury.
Advertencia!
Lea y siga todas las precauciones de
seguridad dadas en el manual de
instrucciones – el uso incorrecto puede
causar lesiones graves o mortales.
STIH)
STIHL BT 121
BA_U1_86_02.fm Seite 0 Dienstag, 7. November 2006 11:04 11

Summary

Safety Precautions and Working Techniques

Operator Requirements and Safety

Details physical, mental, and clothing requirements for safe operation.

Proper Clothing

Specifies required protective apparel for safe operation and to prevent injury.

Earth Auger Safety and Use

Fueling and Fuel Management

Fueling Instructions

Provides step-by-step guidance and safety warnings for refueling.

Starting the Engine

Operating the Earth Auger

Instructions on how to operate the earth auger safely and effectively.

Preparation and Auger Brake

Details pre-operation checks and the function of the auger brake.

Operation and Adjustments

Working Conditions

Operating Instructions

Throttle Cable Adjustment

Assembling the Machine

Fuel Handling and Maintenance

Fuel Mix Ages and Fueling

Auger Brake System

Engaging, Disengaging, and Checking Auger Brake

Covers operation and verification of the auger brake system.

Fitting the Auger

Starting; Stopping the Engine

Starting Procedures

Detailed instructions for starting the engine, including throttle and slide control.

Engine Firing and Running

Engine Shutdown and Troubleshooting

Releasing a Trapped Auger

Cleaning the Air Filter

Adjusting the Carburetor

Standard Setting and Idle Speed Adjustment

Checking the Spark Plug

Replacing Starter Rope and Rewind Spring

Maintenance Chart

Main Parts and Controls

Stihl BT 121 Specifications

Engine Specifications

displacement	30.8 cm3
bore	35 mm
stroke	32 mm
engine power	1.3 kW
max engine speed without drilling tool	12, 300 rpm
engine idle speed	2, 800 rpm

Sound and Vibration

sound pressure level	101 dB (A)
sound power level	107 dB (A)
vibration left handle	2.6 m/s2

Ignition System

electrode gap	0.5 mm
spark plug thread	M 14 x 1.25; 9.5 mm long
spark plug	Bosch WSR 6 F, NGK BPMR 7 A, Champion RCJ 6 Y

Fuel System

fuel tank capacity	0.64 l
carburetor type	All position diaphragm carburetor
air filter	Paper filter element

Drilling Gear

gear type	Two-stage spur gear drive
gear ratio	47.5:1
max spindle speed	190 rpm

Weight and Dimensions

weight without drilling tool	9.4 kg
length of unit	400 mm
width of handle frame	530 mm