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Stihl BT 120 C Manual
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Stihl BT 120 C Manual

Stihl BT 120 C Manual

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Parts and Controls
Definitions
Safety Precautions
Assembling the Earth Auger
Fuel
Fueling
Auger Brake
Fitting the Auger
Starting
Operating Instructions
Releasing a Trapped Auger
Adjusting the Carburetor
Motor Management
Printed on chlorine-free paper
Printing inks contain vegetable oils,
paper is recyclable
© 2000 Andreas Stihl AG & Co., Waiblingen
0458 427 3021. M1. B0. T. Printed in Germany
%7  &
2
Air Filter
3
Engine Running Behavior
4
Checking the Spark Plug
10
Lubricating the Drilling Gear
10
Replacing the Starter Rope
11
and Rewind Spring
12
Maintenance Chart
13
Specifications
13
Storing the Machine
16
STIHL Incorporated Federal Emission
16
Control Warranty Statement
17
17
17
This manual contains warnings,
18
operating and safety precautions for
18
the STIHL BT 120 C earth auger.
19
Pay special attention to the safety
precautions outlined on pages 4 to 9.
19
Allow only persons who understand this
22
manual to operate your earth auger.
23
To receive maximum performance and
24
satisfaction from your STIHL earth
auger, it is important that you read and
25
understand the maintenance and safety
precautions before using your earth
auger. Contact your STIHL dealer or the
STIHL distributor for your area if you do
not understand any of the instructions in
this manual.
:DUQLQJ
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. Careless or improper use may
cause serious or even fatal injury.
STIHL's philosophy is to continually
improve all of its products. As a result,
engineering changes and improve-
ments are made from time to time. If
the operating characteristics or the
appearance of your earth auger
differs from those described in this
manual, please contact your STIHL
dealer for information and assistance.


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Summary of Contents for Stihl BT 120 C

  • Page 1 Definitions Engine Running Behavior operating and safety precautions for Safety Precautions Checking the Spark Plug the STIHL BT 120 C earth auger. Assembling the Earth Auger Lubricating the Drilling Gear Pay special attention to the safety Fuel Replacing the Starter Rope precautions outlined on pages 4 to 9.
  • Page 2 3DUWV DQG &RQWUROV Starter grip Idle speed screw Air filter cover Fuel filler cap Muffler (with spark arresting screen) Slide control Throttle trigger interlock Throttle trigger Spark plug boot Screw plug Drilling spindle Fuel pump Choke knob Auger brake activating lever Padding %7  &...
  • Page 3 'HILQLWLRQV 6WDUWHU *ULS 7KURWWOH 7ULJJHU The grip of the starter, for starting Controls the speed of the engine. the engine. 6SDUN 3OXJ %RRW ,GOH 6SHHG 6FUHZ Connects the spark plug with the For adjusting engine idle speed. ignition wire. $LU )LOWHU &RYHU  6FUHZ 3OXJ Covers the air filter element.
  • Page 4 Have carpal tunnel syndrome. These controls and function of the parts of your your STIHL dealer show you how to conditions reduce the hand’s ability to earth auger. operate your earth auger. Observe all...
  • Page 5 Never modify an earth auger in any way. chapter on "Fuel" in your owner’s Only drilling tools supplied by STIHL or manual). To reduce the risk of falling as a result of expressly approved by STIHL for use...
  • Page 6 :DUQLQJ the gas cap on the STIHL product grip on the machine and a good foothold Never operate your earth auger if it is carefully so as to allow any pressure...
  • Page 7 6WDUWLQJ If you cannot set the correct idle speed, permit the rope to rewind properly. have your STIHL dealer check your Failure to follow this procedure may For specific starting instructions, see the earth auger and make proper result in injury to hand or fingers and appropriate section of your manual.
  • Page 8 and remove as descripted in the chapter backing the drilling tool out of the hole. If :DUQLQJ entitled "Removing a Trapped Auger". any portion of the machine strikes a Work carefully in rocky ground. Keep Operate and start your earth auger only wire, it will cause electrical injury or throttle feed pressure to a minimum.
  • Page 9 SDUWV ZHUH XVHG 67,+/ PD\ GHQ\ ZDUUDQW\ :DUQLQJ A worn or damaged muffler is a fire Use only STIHL replacement parts for hazard and may cause hearing loss. maintenance and repair. Use of parts Check to see that the muffler is in good manufactured by others may damage condition.
  • Page 10 For this reason it is essential that you use only name branded fuels! Use only STIHL two-stroke engine oil or equivalent branded two-stroke air- cooled engine oils with the classification TC for mixing.
  • Page 11 3 months of storage. Store in approved safety fuel-canisters only. When mixing, pour oil into the canister first, and then add gasoline. Gaso- Oil (STIHL 50:1 or line equivalent branded TC oils) US gal. US fl.oz 2 1/2 12.8...
  • Page 12 The auger brake is subject to normal wear and tear. Check that it is operating properly before you start work. If the auger brake fails, have it repaired immediately by your STIHL service shop. (QJDJLQJ DXJHU EUDNH 5HOHDVLQJ DXJHU EUDNH • •...
  • Page 13 )LWWLQJ WKH $XJHU 6WDUWLQJ • • 6WDUWLQJ Switch off the engine. Put the earth Observe safety precautions - see auger on the ground so that the section "Safety Precautions". • drilling spindle faces up. Press down the throttle trigger • (QJDJH DXJHU EUDNH interlock  and squeeze throttle Engage the auger brake.
  • Page 14 • • Set the choke knob  :KHQ HQJLQH EHJLQV WR ILUH Place your earth auger on the • Move choke knob to H ground, make sure it is steady. • )RU FROG VWDUW to J Put your right foot in the handle and continue cranking.
  • Page 15 7R VKXW RII WKH HQJLQH • Move the slide control in direction of F to . $W YHU\ ORZ RXWVLGH WHPSHUDWXUHV $OORZ HQJLQH WR ZDUP XS As soon as engine runs: • Blip the throttle trigger to disengage • Remove spark plug boot  . the starting throttle position - •...
  • Page 16 2SHUDWLQJ ,QVWUXFWLRQV 5HOHDVLQJ D 7UDSSHG $XJHU 'XULQJ EUHDNLQ SHULRG :RUNLQJ ZLWK VKDIW H[WHQVLRQ VSHFLDO DFFHVVRU\ A factory new machine should not be run at high revs (full throttle off load) for The shaft extension must not be fitted the first three tank fillings. This avoids until the entire length of the auger is unnecessary high loads during the sunk in the hole.
  • Page 17 $GMXVWLQJ WKH &DUEXUHWRU $LU )LOWHU • Carefully screw the idle speed screw /' down onto its seat coun- terclockwise (left-hand thread). Then open it two turns clockwise. This is the standard setting. • Start and warm up the engine • Now adjust idle speed correctly with the idle speed screw /' : the dril- 0RWRU 0DQDJHPHQW...
  • Page 18 Have the muffler checked for contamination (coking) by a STIHL dealer. 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...
  • Page 19 /XEULFDWLQJ WKH 'ULOOLQJ *HDU 5HSODFLQJ WKH 6WDUWHU 5RSH DQG 5HZLQG 6SULQJ • • Apply tube  of STIHL gear 5HSODFLQJ WKH VWDUWHU URSH Check grease level about every 50 operating hours: lubricant 0781 120 1117 to filler • Unscrew the filler plug  - if there hole.
  • Page 20 5HSODFLQJ D EURNHQ UHZLQG VSULQJ • Remove the rope rotor - see "Replacing the starter rope". :DUQLQJ Broken parts of spring may still be under tension and could be thrown in your • • direction when you remove the rope Ease the cap  out of the starter Pull the rope through the rotor and rotor.
  • Page 21 When the starter rope is fully extended it must be possible to rotate the rotor another half turn. If this is not the case, the spring is overtensioned and could break. • Take one turn of rope off the rotor. •...
  • Page 22 Have checked by STIHL dealer :DUUDQW\ FODLPV IROORZLQJ UHSDLUV The user of this unit should carry out Original STIHL parts can be identified FDQ EH DFFHSWHG RQO\ LI WKH UHSDLU only the maintenance operations by the STlHL part number, the...
  • Page 23 Planting auger: 150mm (6in) dia., Max. torque at 525mm (20.6in) drilling spindle: 79 Nm long 6SHFLDO $FFHVVRULHV Lubrication: STIHL gear lubricant 0781 120 1117 Shaft extension: 450mm (17.7in) long Chuck: For drill diameters of 2 - 13mm (0.08 - 0.50in)
  • Page 24 6WRULQJ WKH 0DFKLQH For periods of about 3 months or longer: • Remove the auger. • Drain and clean the fuel tank. • Run engine until carburetor is dry - this helps prevent the carburetor diaphragms sticking together. • Thoroughly clean the machine - pay special attention to the cylinder fins and air filter.
  • Page 25 STIHL service center as soon as a meet the U.S. EPA regulations for small the part will be repaired or replaced by problem exists.
  • Page 26 Any such work shall be free of Deviations from this recommendation warranty card to STIHL. If any emission charge to the owner if it is determined regarding quality and mixing ratio of fuel related part on your engine is defective, that a warranted part is defective.
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