Instruction Manual
Page 4
...Drilling into or contact with the turning auger and the resulting slowing or stopping of control or cause the handle frame to hit the operator or throw him to reduce the risk of control. Minors should not be observed to the ground, resulting in the area where an earth auger...standards and ordinances. Observe all STIHL earth augers. Most of these safety precautions and warnings apply to use of any earth auger may result in use of any substance (drugs, alcohol, etc.) which might impair vision, dexterity or judgment. the earth auger 3. Be alert - BT 121 3 Be sure that you...
...Drilling into or contact with the turning auger and the resulting slowing or stopping of control or cause the handle frame to hit the operator or throw him to reduce the risk of control. Minors should not be observed to the ground, resulting in the area where an earth auger...standards and ordinances. Observe all STIHL earth augers. Most of these safety precautions and warnings apply to use of any earth auger may result in use of any substance (drugs, alcohol, etc.) which might impair vision, dexterity or judgment. the earth auger 3. Be alert - BT 121 3 Be sure that you...
Instruction Manual
Page 6
...tool to prevent turnover, fuel spillage and damage. These gases (e.g. BT 121 5 Wear an approved safety hard hat to reduce the risk of injury or death. THE USE OF THE EARTH AUGER Transporting the earth auger !Warning! Therefore, to protect your hearing. Other tools, adaptors ...) to rotate. By hand: Carry the earth auger with the specific STIHL earth auger models are authorized. Only drilling tools supplied by STIHL or expressly approved by vehicle: When transporting in use with the drilling tool pointing to the auger, but may damage your head when there...
...tool to prevent turnover, fuel spillage and damage. These gases (e.g. BT 121 5 Wear an approved safety hard hat to reduce the risk of injury or death. THE USE OF THE EARTH AUGER Transporting the earth auger !Warning! Therefore, to protect your hearing. Other tools, adaptors ...) to rotate. By hand: Carry the earth auger with the specific STIHL earth auger models are authorized. Only drilling tools supplied by STIHL or expressly approved by vehicle: When transporting in use with the drilling tool pointing to the auger, but may damage your head when there...
Instruction Manual
Page 8
... starting it is opened to start the earth auger. Never operate your earth auger for the use of injury from reactive forces, the operator must have a firm grip on the machine and a good foothold before starting and when unwinding a trapped auger. BT 121 7 To reduce the risk of injury from a turning drilling tool or from reactive forces, the...
... starting it is opened to start the earth auger. Never operate your earth auger for the use of injury from reactive forces, the operator must have a firm grip on the machine and a good foothold before starting and when unwinding a trapped auger. BT 121 7 To reduce the risk of injury from a turning drilling tool or from reactive forces, the...
Instruction Manual
Page 9
... set the correct idle speed, have your STIHL dealer check your earth auger and make proper adjustments or repairs. Failure to follow this procedure may result in the earth, such as a rock or gravel, may cause the drilling tool to rewind properly. For directions to...Work carefully in a counterclockwise direction. !Warning! When drilling in slow steps frequently clearing drill. 8 BT 121 Clean off auger then continue in heavy clay soil, bore about 1/3 way and remove the auger from a turning drilling tool do not use an earth auger with incorrect idle speed adjustment. To reduce the risk...
... set the correct idle speed, have your STIHL dealer check your earth auger and make proper adjustments or repairs. Failure to follow this procedure may result in the earth, such as a rock or gravel, may cause the drilling tool to rewind properly. For directions to...Work carefully in a counterclockwise direction. !Warning! When drilling in slow steps frequently clearing drill. 8 BT 121 Clean off auger then continue in heavy clay soil, bore about 1/3 way and remove the auger from a turning drilling tool do not use an earth auger with incorrect idle speed adjustment. To reduce the risk...
Instruction Manual
Page 10
... is wet, icy or snow covered. BT 121 9 Keep your hands in the chapter entitled "Removing a Trapped Auger". !Warning! This unit is equipped with an auger brake. Where necessary, confirm actual location by carefully dug trenches. Your model earth auger is not insulated. !Warning! English /...electrical shock or death. !Warning! Contact your local utility company or your earth auger without a properly functioning auger brake. Stay clear of overhead electrical wires when backing the drilling tool out of electrical shock. Special care must also be alert for ...
... is wet, icy or snow covered. BT 121 9 Keep your hands in the chapter entitled "Removing a Trapped Auger". !Warning! This unit is equipped with an auger brake. Where necessary, confirm actual location by carefully dug trenches. Your model earth auger is not insulated. !Warning! English /...electrical shock or death. !Warning! Contact your local utility company or your earth auger without a properly functioning auger brake. Stay clear of overhead electrical wires when backing the drilling tool out of electrical shock. Special care must also be alert for ...
Instruction Manual
Page 11
...of tool changes, check immediately for leaks at your earth auger or cause serious injury. In order to rotate for longer than a few days. 10 BT 121 Replace damaged drilling tools immediately, even if they have only superficial cracks. Store earth auger in good condition. Use of parts manufactured by any ... the end of the emission control devices and systems may be operated if the muffler is a fire hazard and may damage your STIHL servicing dealer only. !Warning! Do not attempt any maintenance or repair work not described in good condition. Cover and clearly mark ...
...of tool changes, check immediately for leaks at your earth auger or cause serious injury. In order to rotate for longer than a few days. 10 BT 121 Replace damaged drilling tools immediately, even if they have only superficial cracks. Store earth auger in good condition. Use of parts manufactured by any ... the end of the emission control devices and systems may be operated if the muffler is a fire hazard and may damage your STIHL servicing dealer only. !Warning! Do not attempt any maintenance or repair work not described in good condition. Cover and clearly mark ...
Instruction Manual
Page 16
...that position. : Move the slide control (3) to position A. This is the starting throttle position. Put the earth auger on the ground so that the drilling spindle faces up . : Push retaining pin into the hole. : Spring clip on "Safety Precautions". Starting...auger brake. : Pull retaining pin (1) out of the auger's shank. : Push the auger (2) onto the drilling spindle so that order. see chapter on retaining pin must fit snugly around auger's shank. : Observe safety precautions - Fitting the Auger Starting / Stopping the Engine English / USA 424BA006 : Shut off the engine. BT 121...
...that position. : Move the slide control (3) to position A. This is the starting throttle position. Put the earth auger on the ground so that the drilling spindle faces up . : Push retaining pin into the hole. : Spring clip on "Safety Precautions". Starting...auger brake. : Pull retaining pin (1) out of the auger's shank. : Push the auger (2) onto the drilling spindle so that order. see chapter on retaining pin must fit snugly around auger's shank. : Observe safety precautions - Fitting the Auger Starting / Stopping the Engine English / USA 424BA006 : Shut off the engine. BT 121...
Instruction Manual
Page 20
...BT 121 19 counterclockwise - carburation, ignition, timing and valve or port timing) without the addition of any major hardware. 3 2 250BA022 KN If the auger jams in the drill hole, shut off the engine immediately. : Move the slide control in direction of the fundamental engine parameters and components (e.g. if it - to unwind the auger... in the tab (1). : Remove the filter cover (2). : Clean away loose dirt from the ground. Releasing a Trapped Auger Cleaning the Air Filter 1 English / USA Motor Management Exhaust emissions are controlled by the design of c to $ : Engage the...
...BT 121 19 counterclockwise - carburation, ignition, timing and valve or port timing) without the addition of any major hardware. 3 2 250BA022 KN If the auger jams in the drill hole, shut off the engine immediately. : Move the slide control in direction of the fundamental engine parameters and components (e.g. if it - to unwind the auger... in the tab (1). : Remove the filter cover (2). : Clean away loose dirt from the ground. Releasing a Trapped Auger Cleaning the Air Filter 1 English / USA Motor Management Exhaust emissions are controlled by the design of c to $ : Engage the...
Instruction Manual
Page 21
max. 3/4 turn : Carefully turn in the same direction from that position. 20 BT 121 With this carburetor it one full turn the low speed screw (L) down the engine. : Remove the auger from the factory with a standard setting. Standard Setting : Shut down onto its seat clockwise. see chapter ...most operating conditions. H L 1 LA 250BA039 KN : Turn the high speed screw (H) counterclockwise as far as necessary. : Check that the drilling spindle does not rotate. then turn the screw about another half to adjust the high speed screw within fine limits. English / USA Adjusting ...
max. 3/4 turn : Carefully turn in the same direction from that position. 20 BT 121 With this carburetor it one full turn the low speed screw (L) down the engine. : Remove the auger from the factory with a standard setting. Standard Setting : Shut down onto its seat clockwise. see chapter ...most operating conditions. H L 1 LA 250BA039 KN : Turn the high speed screw (H) counterclockwise as far as necessary. : Check that the drilling spindle does not rotate. then turn the screw about another half to adjust the high speed screw within fine limits. English / USA Adjusting ...
Instruction Manual
Page 27
Complete machine Visual inspection (condition, leaks) X x Clean X Auger brake Check operation X X Have serviced by dealer 1) Gearbox Re-lubricate Drilling spindle Clean X Auger Inspect X Replace Safety labels Replace 1) STIHL recommends the STIHL servicing dealer X X X X X X X X X X X X X X X x 26 BT 121 If your daily working time is longer than normal or conditions are difficult (very dusty work or daily after 100 hours of...
Complete machine Visual inspection (condition, leaks) X x Clean X Auger brake Check operation X X Have serviced by dealer 1) Gearbox Re-lubricate Drilling spindle Clean X Auger Inspect X Replace Safety labels Replace 1) STIHL recommends the STIHL servicing dealer X X X X X X X X X X X X X X X x 26 BT 121 If your daily working time is longer than normal or conditions are difficult (very dusty work or daily after 100 hours of...
Instruction Manual
Page 28
Main Parts and Controls BT 121 English / USA 1 Starter grip 2 Carburetor adjusting screws 3 Air filter cover 4 Fuel tank filler cap 5 Muffler (with spark arresting screen) 6 Slide control 7 Throttle trigger interlock 8 Throttle trigger 9 Spark plug boot 10 Screw plug 11 Drilling spindle 12 Fuel pump 13 Choke knob 14 Auger brake lever 15 Padding 27
Main Parts and Controls BT 121 English / USA 1 Starter grip 2 Carburetor adjusting screws 3 Air filter cover 4 Fuel tank filler cap 5 Muffler (with spark arresting screen) 6 Slide control 7 Throttle trigger interlock 8 Throttle trigger 9 Spark plug boot 10 Screw plug 11 Drilling spindle 12 Fuel pump 13 Choke knob 14 Auger brake lever 15 Padding 27
Instruction Manual
Page 29
... Connects the spark plug to the power drill. 12. Drilling spindle For attaching the chuck or adapter ... Intermediate = 125 hours, Moderate = 50 hours Engine STIHL single cylinder two-stroke engine Displacement: Bore: Stroke: ...screen) Reduces exhaust noises and diverts exhaust gases away from operator. 6. Auger Brake Activating Lever Lever for gearbox grease. 11. Category: A = ... Seals filler opening for engaging and disengaging the auger brake. 15. Choke Knob Operates choke to... Screws For tuning the carburetor. 3. engine speed without auger Idle speed 1.88 cu.in (30.8 cm3) 1.38 in ...
... Connects the spark plug to the power drill. 12. Drilling spindle For attaching the chuck or adapter ... Intermediate = 125 hours, Moderate = 50 hours Engine STIHL single cylinder two-stroke engine Displacement: Bore: Stroke: ...screen) Reduces exhaust noises and diverts exhaust gases away from operator. 6. Auger Brake Activating Lever Lever for gearbox grease. 11. Category: A = ... Seals filler opening for engaging and disengaging the auger brake. 15. Choke Knob Operates choke to... Screws For tuning the carburetor. 3. engine speed without auger Idle speed 1.88 cu.in (30.8 cm3) 1.38 in ...
Instruction Manual
Page 30
...400 mm) Width of handle frame approx. 20.9 in (530 mm) Height without drilling tool (auger) approx. 13.4 in (340 mm) Rewind Starter Starter rope: 0.11 in (3.0 mm) diameter, 33.5 in (850 mm) long Drilling Tools (Augers) Earth augers 1.6, 2.4, 3.5, 4.7, 5.9, 7.9 in diameter (40, 60, 90, 120, ...Drilling Gear Type Two-stage spur gear drive Gear ratio 47.5 : 1 Max. torque at drilling spindle 79 Nm Lubrication STIHL gear lubricant for all markets) Electrode gap 0.02 in (0.5 mm) Spark plug thread M 14 x 1.25; 0.37 in (450 mm) long Chuck For drill diameters from 5/64" to 1/2" (2 to 13 mm) BT 121...
...400 mm) Width of handle frame approx. 20.9 in (530 mm) Height without drilling tool (auger) approx. 13.4 in (340 mm) Rewind Starter Starter rope: 0.11 in (3.0 mm) diameter, 33.5 in (850 mm) long Drilling Tools (Augers) Earth augers 1.6, 2.4, 3.5, 4.7, 5.9, 7.9 in diameter (40, 60, 90, 120, ...Drilling Gear Type Two-stage spur gear drive Gear ratio 47.5 : 1 Max. torque at drilling spindle 79 Nm Lubrication STIHL gear lubricant for all markets) Electrode gap 0.02 in (0.5 mm) Spark plug thread M 14 x 1.25; 0.37 in (450 mm) long Chuck For drill diameters from 5/64" to 1/2" (2 to 13 mm) BT 121...