Instruction Manual
Page 2
... Rewind Spring 23 Storing the Machine 25 Maintenance Chart 26 Main Parts and Controls 27 Specifications 28 Maintenance and Repairs 30 STIHL Incorporated Federal Emission Control Warranty Statement 31 STIHl BT 121 English / USA Allow only persons who understand this manual. !Warning! To receive maximum performance and satisfaction from your STIHL earth auger, it is a hightorque, gasoline-powered...
... Rewind Spring 23 Storing the Machine 25 Maintenance Chart 26 Main Parts and Controls 27 Specifications 28 Maintenance and Repairs 30 STIHL Incorporated Federal Emission Control Warranty Statement 31 STIHl BT 121 English / USA Allow only persons who understand this manual. !Warning! To receive maximum performance and satisfaction from your STIHL earth auger, it is a hightorque, gasoline-powered...
Instruction Manual
Page 3
...BT 121 In addition to the operating instructions, this manual may not be available as special accessories from time to time. Example: Loosen the screw (1) Lever (2) ... Such components may improve the operator's understanding of your machine differ from those described in this manual, please contact your STIHL... features This instruction manual may be marked in order to avoid damage to the environment. Engineering improvements STIHL's philosophy is a risk of the machine. Caution where there is to continually improve all models and related applications are not installed on correct...
...BT 121 In addition to the operating instructions, this manual may not be available as special accessories from time to time. Example: Loosen the screw (1) Lever (2) ... Such components may improve the operator's understanding of your machine differ from those described in this manual, please contact your STIHL... features This instruction manual may be marked in order to avoid damage to the environment. Engineering improvements STIHL's philosophy is a risk of the machine. Caution where there is to continually improve all models and related applications are not installed on correct...
Instruction Manual
Page 5
...legs. Therefore, continual and regular users should monitor closely the condition of serious or fatal injury, persons with any earth auger can be aggravated by the earth auger, good footing is above symptoms appear, seek medical advice immediately. !Warning! This field may interfere with your ... and carpal tunnel syndrome, please note the following: - In order to reduce the risk of earth augers (or other machines) exposing the operator to whitefinger disease are recommended. 4 BT 121 The ignition system of your doctor before operating this tool. To reduce the risk of a very...
...legs. Therefore, continual and regular users should monitor closely the condition of serious or fatal injury, persons with any earth auger can be aggravated by the earth auger, good footing is above symptoms appear, seek medical advice immediately. !Warning! This field may interfere with your ... and carpal tunnel syndrome, please note the following: - In order to reduce the risk of earth augers (or other machines) exposing the operator to whitefinger disease are recommended. 4 BT 121 The ignition system of your doctor before operating this tool. To reduce the risk of a very...
Instruction Manual
Page 8
...BT 121 7 To reduce the risk of injury from a turning drilling tool or from reactive forces, the throttle trigger must have a firm grip on the machine and a good foothold before starting instructions, see the appropriate section of injury from reactive forces by one person. See the chapter on "Auger.... Starting For specific starting it is released. Your earth auger should always inspect your manual. !Warning! Operating the earth auger The earth auger should also be started only when it . To reduce the risk of your earth auger for the use of fuel. Pay special attention to...
...BT 121 7 To reduce the risk of injury from a turning drilling tool or from reactive forces, the throttle trigger must have a firm grip on the machine and a good foothold before starting instructions, see the appropriate section of injury from reactive forces by one person. See the chapter on "Auger.... Starting For specific starting it is released. Your earth auger should always inspect your manual. !Warning! Operating the earth auger The earth auger should also be started only when it . To reduce the risk of your earth auger for the use of fuel. Pay special attention to...
Instruction Manual
Page 10
...cables or wires can cause serious injury or death as cable detectors and/or by use of devices such as a result of the machine strikes a wire, it cannot drill through and the powerhead begins to control sudden jolts and reactive forces. This unit is wet, icy... damage to reduce the risk of the powerhead. !Warning! BT 121 9 If reactive forces are in a well ventilated area. Operate and start your earth auger under good visibility and daylight conditions only. Contact your local utility company or your earth auger handles and grip are not controlled, rotation of control and...
...cables or wires can cause serious injury or death as cable detectors and/or by use of devices such as a result of the machine strikes a wire, it cannot drill through and the powerhead begins to control sudden jolts and reactive forces. This unit is wet, icy... damage to reduce the risk of the powerhead. !Warning! BT 121 9 If reactive forces are in a well ventilated area. Operate and start your earth auger under good visibility and daylight conditions only. Contact your local utility company or your earth auger handles and grip are not controlled, rotation of control and...
Instruction Manual
Page 11
...the engine before putting the machine down or transporting it and the ignition lead are always in particular. !Warning! Check fuel filler cap for maintenance and repair. However if you claim warranty for longer than a few days. 10 BT 121 Cover and clearly mark boreholes... short intervals. Have such work not described in a hole. Check to repair damaged drilling tools. Store earth auger in a high or locked place, away from stepping in your STIHL servicing dealer only. !Warning! English / USA Operating Instructions !Warning! Keep spark plug and wire connections tight...
...the engine before putting the machine down or transporting it and the ignition lead are always in particular. !Warning! Check fuel filler cap for maintenance and repair. However if you claim warranty for longer than a few days. 10 BT 121 Cover and clearly mark boreholes... short intervals. Have such work not described in a hole. Check to repair damaged drilling tools. Store earth auger in a high or locked place, away from stepping in your STIHL servicing dealer only. !Warning! English / USA Operating Instructions !Warning! Keep spark plug and wire connections tight...
Instruction Manual
Page 12
Mounting the Auger Brake Lever : Place the activating lever (1) in the retainer. : Fit the clamp (2) on the activating lever. : Insert the screws (3) and tighten them down firmly. : Attach the holders (2) of the padding (1) to the bottom of the slot (see illustration). 002BA163 KN BT 121 11 Assembling the Machine Fitting the Padding English / USA Adjusting...
Mounting the Auger Brake Lever : Place the activating lever (1) in the retainer. : Fit the clamp (2) on the activating lever. : Insert the screws (3) and tighten them down firmly. : Attach the holders (2) of the padding (1) to the bottom of the slot (see illustration). 002BA163 KN BT 121 11 Assembling the Machine Fitting the Padding English / USA Adjusting...
Instruction Manual
Page 13
...quality unleaded gasoline! When filling at a mix ratio of highquality gasoline and quality two-stroke air cooled engine oil. this reason STIHL recommends that are sitting in both water cooled and air cooled engines (e.g., outboard motors, snowmobiles, chainsaws, mopeds, etc.). If the... castings and catalytic converters as necessary. 12 BT 121 This could cause running problems or even damage the engine. Avoid direct contact with a lower octane rating may increase engine temperatures. The chemical composition of 89 (R+M/2). The machine's fuel tank and the canister in which fuel...
...quality unleaded gasoline! When filling at a mix ratio of highquality gasoline and quality two-stroke air cooled engine oil. this reason STIHL recommends that are sitting in both water cooled and air cooled engines (e.g., outboard motors, snowmobiles, chainsaws, mopeds, etc.). If the... castings and catalytic converters as necessary. 12 BT 121 This could cause running problems or even damage the engine. Avoid direct contact with a lower octane rating may increase engine temperatures. The chemical composition of 89 (R+M/2). The machine's fuel tank and the canister in which fuel...
Instruction Manual
Page 14
In order to reduce the risk of storage. Gasoline Oil (STIHL 50:1 or equivalent high-quality oils) US gal. 1 2 1/2 5 US fl.oz 2.6 6.4 12.8 Dispose of the oil with the fuel. Before storing your machine. BT 121 13 When mixing, pour oil into the tank. After fueling, tighten down the filler cap...securely as to allow any pressure build-up in approved fuel-canisters only. Always thoroughly shake the mixture in the can before fueling your machine for a few days work, not to ensure that no dirt falls into the canister first, and then add gasoline. Close the canister...
In order to reduce the risk of storage. Gasoline Oil (STIHL 50:1 or equivalent high-quality oils) US gal. 1 2 1/2 5 US fl.oz 2.6 6.4 12.8 Dispose of the oil with the fuel. Before storing your machine. BT 121 13 When mixing, pour oil into the tank. After fueling, tighten down the filler cap...securely as to allow any pressure build-up in approved fuel-canisters only. Always thoroughly shake the mixture in the can before fueling your machine for a few days work, not to ensure that no dirt falls into the canister first, and then add gasoline. Close the canister...
Instruction Manual
Page 17
...still engaged, the engine must be damaged. 16 BT 121 When the engine begins to fire: : Turn the choke knob to full length - the slide control (3) moves to idle speed immediately - Do not pull out starter rope to e and continue cranking. Since the auger brake is secure. : Put your right foot... in the handle frame and press down to idle speed. . English / USA 5 4 427BA007 KN : Set the choke knob (4): To g if engine is still cold) : Press the fuel pump bulb (5) at least five times. : Place the machine on the ground...
...still engaged, the engine must be damaged. 16 BT 121 When the engine begins to fire: : Turn the choke knob to full length - the slide control (3) moves to idle speed immediately - Do not pull out starter rope to e and continue cranking. Since the auger brake is secure. : Put your right foot... in the handle frame and press down to idle speed. . English / USA 5 4 427BA007 KN : Set the choke knob (4): To g if engine is still cold) : Press the fuel pump bulb (5) at least five times. : Place the machine on the ground...
Instruction Manual
Page 19
... can be removed before the auger is in Period A factory new machine should not be kept properly under control. After Finishing Work Wait for the first three tank fillings. Working with the shaft extension fitted increases the risk of the hole. 18 BT 121 As all accessible screws and nuts... (not adjusting screws) at regular regulars and retighten as necessary. Starting a hole with Shaft Extension (special accessory) Do not fit the shaft extension until the full length of the auger is pulled out of personal injury...
... can be removed before the auger is in Period A factory new machine should not be kept properly under control. After Finishing Work Wait for the first three tank fillings. Working with the shaft extension fitted increases the risk of the hole. 18 BT 121 As all accessible screws and nuts... (not adjusting screws) at regular regulars and retighten as necessary. Starting a hole with Shaft Extension (special accessory) Do not fit the shaft extension until the full length of the auger is pulled out of personal injury...
Instruction Manual
Page 20
...fundamental engine parameters and components (e.g. BT 121 19 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,...immediately. : Move the slide control in direction of c to $ : Engage the auger brake by the design of engine power : Turn choke knob to g : Press in... filter cover (2). : Clean away loose dirt from the ground. if it - Releasing a Trapped Auger Cleaning the Air Filter 1 English / USA Motor Management Exhaust emissions are controlled by moving the activating lever to...
...fundamental engine parameters and components (e.g. BT 121 19 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,...immediately. : Move the slide control in direction of c to $ : Engage the auger brake by the design of engine power : Turn choke knob to g : Press in... filter cover (2). : Clean away loose dirt from the ground. if it - Releasing a Trapped Auger Cleaning the Air Filter 1 English / USA Motor Management Exhaust emissions are controlled by moving the activating lever to...
Instruction Manual
Page 21
... setting. Adjusting Idle Speed Engine stops while idling : Carry out standard setting with the idle speed screw (LA) so that position. 20 BT 121 English / USA Adjusting the Carburetor General Information Your carburetor comes from that the drilling spindle does not rotate. see chapter on "Adjusting the ...- Drilling spindle rotates when engine is only possible to one turn the low speed screw (L) down the engine. : Remove the auger from the machine. : Check air filter and clean or replace as stop - This setting provides an optimum fuel-air mixture under most operating conditions.
... setting. Adjusting Idle Speed Engine stops while idling : Carry out standard setting with the idle speed screw (LA) so that position. 20 BT 121 English / USA Adjusting the Carburetor General Information Your carburetor comes from that the drilling spindle does not rotate. see chapter on "Adjusting the ...- Drilling spindle rotates when engine is only possible to one turn the low speed screw (L) down the engine. : Remove the auger from the machine. : Check air filter and clean or replace as stop - This setting provides an optimum fuel-air mixture under most operating conditions.
Instruction Manual
Page 26
Storing the Machine For periods of about 3 months or longer: : Removing the auger. : Drain and clean the fuel tank in a well ventilated area. : Dispose of children and other unauthorized persons. out of the reach of fuel properly in a dry, high or locked location - this helps prevent carburetor diaphragms sticking together. : Thoroughly clean the machine - pay special attention to the cylinder fins and air filter. : Store the machine in accordance with local environmental requirements. : Run engine until carburetor is dry - BT 121 English / USA 25
Storing the Machine For periods of about 3 months or longer: : Removing the auger. : Drain and clean the fuel tank in a well ventilated area. : Dispose of children and other unauthorized persons. out of the reach of fuel properly in a dry, high or locked location - this helps prevent carburetor diaphragms sticking together. : Thoroughly clean the machine - pay special attention to the cylinder fins and air filter. : Store the machine in accordance with local environmental requirements. : Run engine until carburetor is dry - BT 121 English / USA 25
Instruction Manual
Page 27
...Please note that the following maintenance intervals apply for normal operating conditions. Complete machine Visual inspection (condition, leaks) X x Clean X Auger brake Check operation X X Have serviced by dealer 1) Control handle Check ...STIHL dealer All accessible screws and nuts (not adjusting screws) Retighten Antivibration elements Check X Have replaced 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...
...Please note that the following maintenance intervals apply for normal operating conditions. Complete machine Visual inspection (condition, leaks) X x Clean X Auger brake Check operation X X Have serviced by dealer 1) Control handle Check ...STIHL dealer All accessible screws and nuts (not adjusting screws) Retighten Antivibration elements Check X Have replaced 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...
Instruction Manual
Page 30
...machine approx. 15.7 in (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, 150, 200 mm), 27.4 in (695 mm) long Planting hole auger 10.2 in (260 mm) Planting auger 6 in (... 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...
...machine approx. 15.7 in (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, 150, 200 mm), 27.4 in (695 mm) long Planting hole auger 10.2 in (260 mm) Planting auger 6 in (... 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...
Instruction Manual
Page 33
... liable for damages to other services and adjustments necessary for required maintenance at and after the first scheduled replacement point. 32 BT 121 Emission test may be charged for the cost of required maintenance, : repairs improperly performed or replacements not conforming to the ...be used for a component and the machine is tested as the owner, shall not be performed either at STIHL Incorporated or at any independent test laboratory. Warranty Work STIHL Incorporated shall remedy warranty defects at any authorized STIHL servicing dealer or warranty station. Limitations This...
... liable for damages to other services and adjustments necessary for required maintenance at and after the first scheduled replacement point. 32 BT 121 Emission test may be charged for the cost of required maintenance, : repairs improperly performed or replacements not conforming to the ...be used for a component and the machine is tested as the owner, shall not be performed either at STIHL Incorporated or at any independent test laboratory. Warranty Work STIHL Incorporated shall remedy warranty defects at any authorized STIHL servicing dealer or warranty station. Limitations This...