Instruction Manual
Page 2
...20 Starting / Stopping the Engine ........ 21 Operating Instructions 25 Cleaning the Air Filter 26 Motor Management 27 Adjusting the Carburetor 27 Spark Arresting Screen in Muffler ... 28 Checking the Spark Plug 28 Rewind Starter 29 Storing the Machine 30 Checking...Maintenance and Repairs 39 STIHL Incorporated Federal and California Emission Control Warranty Statement 40 STIHl HT 73 english / USA Allow only persons who understand this manual, please contact your STIHL dealer for your STIHL dealer or the STIHL distributor for information and assistance. 1 STIHL's philosophy is to ...
...20 Starting / Stopping the Engine ........ 21 Operating Instructions 25 Cleaning the Air Filter 26 Motor Management 27 Adjusting the Carburetor 27 Spark Arresting Screen in Muffler ... 28 Checking the Spark Plug 28 Rewind Starter 29 Storing the Machine 30 Checking...Maintenance and Repairs 39 STIHL Incorporated Federal and California Emission Control Warranty Statement 40 STIHl HT 73 english / USA Allow only persons who understand this manual, please contact your STIHL dealer for your STIHL dealer or the STIHL distributor for information and assistance. 1 STIHL's philosophy is to ...
Instruction Manual
Page 13
... away from spark plug or with the skin and avoid inhaling fuel vapor! 12 HT 73 Avoid direct contact with unseated spark plug, since uncontained sparking may create arcing that ...the chain is stopped before each use only spark plugs authorized by STIHL. Do not operate your muffler was equipped with a spark-arresting screen to cut or...wire connector in good condition. !Warning! Tighten all nuts, bolts and screws except the carburetor adjustment screws before undertaking any adjustments, maintenance or repair work performed at proper tension. Before ...
... away from spark plug or with the skin and avoid inhaling fuel vapor! 12 HT 73 Avoid direct contact with unseated spark plug, since uncontained sparking may create arcing that ...the chain is stopped before each use only spark plugs authorized by STIHL. Do not operate your muffler was equipped with a spark-arresting screen to cut or...wire connector in good condition. !Warning! Tighten all nuts, bolts and screws except the carburetor adjustment screws before undertaking any adjustments, maintenance or repair work performed at proper tension. Before ...
Instruction Manual
Page 18
.... HT 73 17 Note: Units with the classification TC for mixing. We recommend STIHL 50:1 two-stroke engine oil since it is essential that you use BIA or TCW (two-stoke water cooled) mix oils. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms..., oil seals, fuel lines etc.), but magnesium castings as well. The canister should be kept tightly closed in models with the skin and avoid inhaling fuel vapour. Gasoline Oil (STIHL 50:1 or equivalent branded TC oils) US ...
.... HT 73 17 Note: Units with the classification TC for mixing. We recommend STIHL 50:1 two-stroke engine oil since it is essential that you use BIA or TCW (two-stoke water cooled) mix oils. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms..., oil seals, fuel lines etc.), but magnesium castings as well. The canister should be kept tightly closed in models with the skin and avoid inhaling fuel vapour. Gasoline Oil (STIHL 50:1 or equivalent branded TC oils) US ...
Instruction Manual
Page 19
.... Always thoroughly shake the mixture in the canister before fueling your machine for a long period, drain and clean the fuel tank and run engine until carburetor is dry. Change the fuel pick up as possible by hand. After fueling, tighten fuel cap as securely as necessary. 18 HT 73
.... Always thoroughly shake the mixture in the canister before fueling your machine for a long period, drain and clean the fuel tank and run engine until carburetor is dry. Change the fuel pick up as possible by hand. After fueling, tighten fuel cap as securely as necessary. 18 HT 73
Instruction Manual
Page 24
... around the fan housing - Do not pull out starter rope to e and continue cranking As soon as engine runs: : Blip the throttle trigger - HT 73 23 Make sure carburetor is idling. it engage - and then give it slowly into the housing so that it is ready for operation. 390BA009 KN Alternative method: : Remove...
... around the fan housing - Do not pull out starter rope to e and continue cranking As soon as engine runs: : Blip the throttle trigger - HT 73 23 Make sure carburetor is idling. it engage - and then give it slowly into the housing so that it is ready for operation. 390BA009 KN Alternative method: : Remove...
Instruction Manual
Page 26
...links on the underside of the bar must not come out of the bar and can be dissipated by hand. see chapter "Adjusting the Carburetor". After a long period of nuts and screws (not adjusting screws) at operating temperature during cutting work. Check tightness of full-throttle operation...the chain again after about 5 to sag. HT 73 25 A new chain has to bed in during the break-in period, the frictional resistances in use for some time. The chain contracts as necessary. This protects engine-mounted components (ignition, carburetor) from thermal overload. If it is not slackened...
...links on the underside of the bar must not come out of the bar and can be dissipated by hand. see chapter "Adjusting the Carburetor". After a long period of nuts and screws (not adjusting screws) at operating temperature during cutting work. Check tightness of full-throttle operation...the chain again after about 5 to sag. HT 73 25 A new chain has to bed in during the break-in period, the frictional resistances in use for some time. The chain contracts as necessary. This protects engine-mounted components (ignition, carburetor) from thermal overload. If it is not slackened...
Instruction Manual
Page 28
HT 73 27 carburation, ignition, timing and valve or port timing) without the addition of the screw (see arrow) just disappears. Then turn the screw 6 full turns ... (LA) counterclockwise until the end of any major hardware. 380BA008 KN 380BA013 KN Motor Management Adjusting the Carburetor english / USA Exhaust emissions are controlled by the design of the fundamental engine parameters and components (e.g. The carburetor is set at the factory to provide an optimum fuel-air mixture under all operating conditions.
HT 73 27 carburation, ignition, timing and valve or port timing) without the addition of the screw (see arrow) just disappears. Then turn the screw 6 full turns ... (LA) counterclockwise until the end of any major hardware. 380BA008 KN 380BA013 KN Motor Management Adjusting the Carburetor english / USA Exhaust emissions are controlled by the design of the fundamental engine parameters and components (e.g. The carburetor is set at the factory to provide an optimum fuel-air mixture under all operating conditions.
Instruction Manual
Page 31
... e.g. Replacing the chain soprocket The chain sprocket is driven via a friction clutch. Therefore, have the chain sprocket replaced by an authorized STIHL servicing dealer. * see „Guide to Using this would reduce the life of the chain. Replace the chain sprocket sooner if the...(1/64") since this Manual" 30 HT 73 english / USA Storing the Machine Checking Chain Sprocket For periods of about 3 months or longer: : Drain and clean the fuel tank in a well ventilated area. : Run engine until carburetor is dry, this helps prevent the carburetor diaphragms sticking together. : Remove the ...
... e.g. Replacing the chain soprocket The chain sprocket is driven via a friction clutch. Therefore, have the chain sprocket replaced by an authorized STIHL servicing dealer. * see „Guide to Using this would reduce the life of the chain. Replace the chain sprocket sooner if the...(1/64") since this Manual" 30 HT 73 english / USA Storing the Machine Checking Chain Sprocket For periods of about 3 months or longer: : Drain and clean the fuel tank in a well ventilated area. : Run engine until carburetor is dry, this helps prevent the carburetor diaphragms sticking together. : Remove the ...
Instruction Manual
Page 36
...idle Spark plug Readjust electrode gap Cooling inlets Clean X Inspect X Spark arresting screen in fuel tank Check Replace Fuel tank Clean Carburetor Check idle adjustment - Maintenance Chart english / USA before starting work after finishing work or daily after each refueling stop weekly monthly every... Check chain tension X X Sharpen Check (wear, damage) X Clean and turn over X Guide bar Deburr X Replace Check X Chain sprocket Replace 1) 1) STIHL dealer * see "Guide to Using this Manual" HT 73 X X X X X X X X X X X X X X X X X X X X X 35
...idle Spark plug Readjust electrode gap Cooling inlets Clean X Inspect X Spark arresting screen in fuel tank Check Replace Fuel tank Clean Carburetor Check idle adjustment - Maintenance Chart english / USA before starting work after finishing work or daily after each refueling stop weekly monthly every... Check chain tension X X Sharpen Check (wear, damage) X Clean and turn over X Guide bar Deburr X Replace Check X Chain sprocket Replace 1) 1) STIHL dealer * see "Guide to Using this Manual" HT 73 X X X X X X X X X X X X X X X X X X X X X 35
Instruction Manual
Page 37
... Chain sprocket 19 Chain tensioner 20 Muffler (with spark arresting screen) 21 Fuel tank 22 Fuel filler cap 23 Starter grip 24 Choke lever 25 Carburetor adjusting screws HT 73
... Chain sprocket 19 Chain tensioner 20 Muffler (with spark arresting screen) 21 Fuel tank 22 Fuel filler cap 23 Starter grip 24 Choke lever 25 Carburetor adjusting screws HT 73
Instruction Manual
Page 38
... Plug Boot Connects the spark plug to branch and pulling branches away. 17. Hook For hooking machine to the ignition wire. 7. HT 73 37 Telescopic Shaft Adjustable shaft enables machine's reach to reduce the risk of chain tension. 20. Throttle Trigger Interlock Must be depressed before...and drive links. 11. Starter Grip The grip of the guide bar. (not illustrated, see chapter "Tensioning the Saw Chain"). Carburetor Adjusting Screws For tuning carburetor Guide Bar Nose The exposed end of the pull starter, which is designed to be activated. 5. english / USA Definitions 1....
... Plug Boot Connects the spark plug to branch and pulling branches away. 17. Hook For hooking machine to the ignition wire. 7. HT 73 37 Telescopic Shaft Adjustable shaft enables machine's reach to reduce the risk of chain tension. 20. Throttle Trigger Interlock Must be depressed before...and drive links. 11. Starter Grip The grip of the guide bar. (not illustrated, see chapter "Tensioning the Saw Chain"). Carburetor Adjusting Screws For tuning carburetor Guide Bar Nose The exposed end of the pull starter, which is designed to be activated. 5. english / USA Definitions 1....
Instruction Manual
Page 39
... mm) Stroke: 1.10 in long (9.5 mm) Fuel System Carburetor: All position diaphragm carburetor with sprocket nose 3005 000 3905 30 cm (12") Oilomatic chain - No. Oil tank capacity: 0.17 l (0.36 US pt) Weight without bar and chain, empty tanks: 15.4 lbs (7.0 kg) 38 HT 73 Bar length: Rollomatic with integral fuel pump Air filter...
... mm) Stroke: 1.10 in long (9.5 mm) Fuel System Carburetor: All position diaphragm carburetor with sprocket nose 3005 000 3905 30 cm (12") Oilomatic chain - No. Oil tank capacity: 0.17 l (0.36 US pt) Weight without bar and chain, empty tanks: 15.4 lbs (7.0 kg) 38 HT 73 Bar length: Rollomatic with integral fuel pump Air filter...
Instruction Manual
Page 41
... in non-warranty maintenance or repairs, and shall not reduce the warranty obligations of two years. 40 HT 73 Environmental Protection Agency (EPA), the California Air Resources Board (CARB) and STIHL Incorporated are responsible for presenting your small off -road equipment engine or a part has failed due to... emission-related part on your small off -road equipment engine to exceed 30 days. STIHL Incorporated must be free from the date of time, not to a STIHL service center as soon as the carburetor and the ignition system. If you should be aware, however, that your engine is...
... in non-warranty maintenance or repairs, and shall not reduce the warranty obligations of two years. 40 HT 73 Environmental Protection Agency (EPA), the California Air Resources Board (CARB) and STIHL Incorporated are responsible for presenting your small off -road equipment engine or a part has failed due to... emission-related part on your small off -road equipment engine to exceed 30 days. STIHL Incorporated must be free from the date of time, not to a STIHL service center as soon as the carburetor and the ignition system. If you should be aware, however, that your engine is...
Instruction Manual
Page 42
... or equivalent replacement part may be replaced by the failure of a warranted part still under warranty. These warranted parts are: Carburetor Choke (Cold start enrichment system) Intake manifold Air filter Spark plug Magneto or electronic ignition system (ignition module) Catalytic converter ... services and adjustments necessary for diagnostic labor which leads to any independent test laboratory. STIHL Incorporated is defective, the part will be performed either at STIHL Incorporated or at any authorized STIHL servicing dealer and present the signed warranty card. HT 73 41
... or equivalent replacement part may be replaced by the failure of a warranted part still under warranty. These warranted parts are: Carburetor Choke (Cold start enrichment system) Intake manifold Air filter Spark plug Magneto or electronic ignition system (ignition module) Catalytic converter ... services and adjustments necessary for diagnostic labor which leads to any independent test laboratory. STIHL Incorporated is defective, the part will be performed either at STIHL Incorporated or at any authorized STIHL servicing dealer and present the signed warranty card. HT 73 41