Stihl MS 151 C Instruction Manual Download

Page: 27 / 40

19.3

Standard Setting

201

1BA048 KN

► Turn high speed screw (H) counterclockwise

as far as stop (no more than 3/4 turn).

► Turn the low speed screw (L) clockwise as far

as stop, then turn it back 1/4 turn.

19.4

Adjusting Idle Speed

► Carry out the standard setting.

► Start the engine.
Warm up the engine. Allow engine to idle for

10 seconds before adjusting the idle speed.

201

1BA049 KN

Engine stops while idling

► Turn the idle speed screw (LA) clockwise until

the chain begins to run – then back it off

4 turns.

Saw chain runs while engine is idling

► Turn the idle speed screw (LA) counterclock‐

wise until the chain stops moving – allow

engine to run at idle speed for 10 seconds.

► Turn the idle speed screw (LA) clockwise until

the chain begins to run – then back it off

4 turns.

WARNING

If the chain continues moving when the engine is

idling, have your saw checked and repaired by

your servicing dealer.

Erratic idling behavior, poor acceleration (even

though standard setting of low speed screw is

correct)
Idle setting is too lean

► Turn the low speed screw (L) carefully coun‐

terclockwise, no further than stop, until the

engine runs smoothly and accelerates well.

It is usually necessary to change the setting of

the idle speed screw (LA) after every correction

to the low speed screw (L).

19.5

Fine Tuning for Operation at

High Altitude

A slight correction of the setting may be neces‐

sary if the engine does not run satisfactorily:

► Carry out the standard setting.

► Warm up the engine.

► Turn high speed screw (H) slightly clockwise

(leaner) – no further than stop.

NOTICE

After returning from high altitude, reset the car‐

buretor to the standard setting.
If the setting is too lean there is a risk of engine

damage due to insufficient lubrication and over‐

heating.

20 Spark Plug

► If the engine is down on power, difficult to start

or runs poorly at idle speed, first check the

spark plug.

► Fit a new spark plug after about 100 operating

hours – or sooner if the electrodes are badly

eroded. Install only suppressed spark plugs of

the type approved by STIHL – see "Specifica‐

tions".

20.1

Removing the Spark Plug

► Move the Master Control lever to 0 or STOP.

201

1BA001 KN

► Disengage the chain brake.

20 Spark Plug

English

0458-506-0121-C

Summary of Contents for MS 151 C

Page 1: ...MS 151 C Instruction Manual 2 39 ...

Page 2: ...HL product It has been built using modern production techni ques and comprehensive quality assurance Every effort has been made to ensure your satis faction and trouble free use of the product Please contact your dealer or our sales company if you have any queries concerning this product Your Dr Nikolas Stihl 1 Guide to Using this Manual This Instruction Manual refers to a STIHL chain saw also cal...

Page 3: ...w you must be rested in good physical condition and mental health If you have any condition that might be aggravated by strenuous work check with your doctor before operating a chain saw Do not operate the chain saw if you are under the influence of any substance drugs alcohol which might impair vision dexterity or judgment To reduce the risk of accidents or injury put off the work in poor weather...

Page 4: ... clean the machine The hard jet of water can damage parts of the machine 2 6 Accessories Only use those tools guide bars chains chain sprockets accessories or technically equivalent components that have been approved by STIHL for this machine If you have any questions in this respect consult a servicing dealer Use only high quality tools and accessories Otherwise there may be a risk of accidents a...

Page 5: ...ng area not even while starting Do not start the chain saw if the chain is in a cut Move at least 3 meters away from the place where the machine was refuelled and never start the motor in enclosed spaces Lock the chain with the chain brake before start ing risk of injury due to rotating chain Do not drop start the engine start as described in the Instruction Manual 2 10 During operation Ensure you...

Page 6: ...is released Check the idle setting regularly and correct when possible Have the machine repaired by a STIHL servicing dealer if the saw chain still continues to move during idling The chain saw produces poisonous exhaust gases as soon as the engine starts These gases may be colour less and odourless and may contain unburnt hydrocarbons and benzene Never work with the machine indoors or in poorly v...

Page 7: ...on in good condition secure connection Check that the muffler is in perfect working con dition Do not use the machine if the muffler is damaged or missing risk of fire damage to hearing Never touch a hot muffler risk of burns The condition of the anti vibration elements influ ences vibration behaviour inspect anti vibration elements periodically Inspect chain catcher replace if damaged Switch off ...

Page 8: ...inch the chain always cut with a correctly sharpened prop erly tensioned chain the depth gauge setting must not be too large Use a low kickback chain and a narrow radius guide bar 3 5 Pull in A 001BA037 KN A Pull in may occur when the chain on the bottom of the guide bar is suddenly pinched caught or encounters a foreign object in the wood The reaction of the chain pulls the saw forward When worki...

Page 9: ... careful when cutting scrub and young trees Thin shoots can be scooped up by the chain saw and hurled towards the user Be careful when cutting splintered wood Risk of injury from ejected pieces of wood Make sure your saw does not touch any foreign materials Stones nails etc may be flung off and damage the saw chain The chain saw may kick back unexpectedly risk of accident If a rotating saw chain h...

Page 10: ...1BA189 KN Sawing technique without use of the spiked bumper risk of pull in position the guide bar at as shallow an angle as possible be especially careful increased risk of kickback 4 2 Preparing for felling Check that there are no other persons in the fell ing area other than helpers Make sure no one is endangered by the falling tree the noise of your engine may drown any warning calls 001BA088 ...

Page 11: ...buttresses first the largest buttress saw first vertically then horizontally only if the tree is in sound condition 4 3 Felling notch Preparing the felling notch 001BA271 KN C C The felling notch C determines the direction of fall Important Make a felling notch at right angle to direction of fall Saw as close to the ground as possible Cut to a depth of approx 1 5 to 1 3 of the diameter of the trun...

Page 12: ... splintering when the tree falls Make cuts at both sides of the trunk at same height as bottom of felling notch to a depth of about 1 10 of trunk diameter On large diameter trees cut to no more than width of guide bar Do not make sapwood cuts if wood is diseased 4 5 Basic information on felling cut Basic dimensions 001BA259 KN G E C C Ø 1 10 The felling notch C determines the direction of fall The...

Page 13: ...lling wedge in the felling cut and drive in with suitable tools Only use aluminum or plastic wedges do not use steel wedges Steel wedges can seriously damage the saw chain and cause dangerous kickback Select suitable felling wedges dependent on the trunk diameter and the width of the kerf ana logue to felling cut E Contact the STIHL dealer for the selection of the felling wedge suitable length wid...

Page 14: ...wood before the hinge 1 guide the chainsaw absolutely horizontally and swivel as widely as possible Make the felling cut up to the hinge 2 Do not cut into the hinge Make the felling cut up to the stabilizing strap 3 Do not cut into the stabilizing strap The felling cut must be continued on the oppo site side of the trunk Ensure that the second cut is at the same level as the first cut Plunge cut t...

Page 15: ... as the first cut Engage the spiked bumper behind the hinge and use this as the rotation point reposition the chainsaw as little as possible Tip of the guide bar must penetrate the wood before the holding strap 4 guide the chain saw absolutely horizontally and swivel as widely as possible Make the felling cut up to the hinge 5 Do not cut into the hinge Make the felling cut up to the holding strap ...

Page 16: ...click the chain brake is disengaged 6 2 Removing the chain sprocket cover 1 2011BA002 KN 2 Unscrew the nut 1 and remove the chain sprocket cover 2 6 3 Mounting the Guide Bar 2011BA003 KN 1 2 Turn the screw 1 to the left until the tensioner slide 2 butts against the left end of the hous ing slot 4 3 2011BA004 KN Fit the guide bar over the stud 3 and engage the peg of the tensioner slide in the hole...

Page 17: ...ion frequently see chapter on Operating Instructions 8 Checking Chain Tension 2011BA009 KN Shut down the engine Wear work gloves to protect your hands The chain must fit snugly against the under side of the bar and it must still be possible to pull the chain along the bar by hand when the chain brake is released If necessary retension the chain A new chain has to be retensioned more often than one...

Page 18: ...ity of gaso line STIHL two stroke engine oil 1 50 Liters Liters ml 1 0 02 20 5 0 10 100 10 0 20 200 15 0 30 300 20 0 40 400 25 0 50 500 Pour oil into an approved safety fuel canister first then add gasoline and mix thoroughly 9 3 Storing fuel mixture Store in approved safety fuel canisters only in a dry cool and secure place protected against light and sunlight Fuel mixture deteriorates with age m...

Page 19: ...ueling and do not overfill the tank STIHL recommends you use the STIHL filler noz zle for fuel special accessory Fill the fuel tank 10 4 Closing 001BA234 KN Grip must be vertical Fit the cap marks on tank cap and fuel tank must line up Press the cap down as far as stop 001BA233 KN While holding the cap depressed turn it clock wise until it engages in position 001BA231 KN The marks on the tank cap ...

Page 20: ...m of the cap to be turned to the correct position Turn the cap clockwise and lock it in position see section on Closing 11 Chain Lubricant For automatic and reliable lubrication of the chain and guide bar use only an environmen tally compatible quality chain and bar lubricant Rapidly biodegradable STIHL BioPlus is recom mended NOTICE Biological chain oil must be resistant to aging e g STIHL BioPlu...

Page 21: ...wn the reason may be a fault in the oil supply system Check chain lubrication clean the oilways con tact your dealer for assistance if necessary STIHL recommends that you have servicing and repair work carried out exclusively by an author ized STIHL servicing dealer 13 Checking Chain Lubrica tion 143BA024 KN The saw chain must always spin off a small amount of oil NOTICE Never operate your machine...

Page 22: ...ced and maintained regularly by trained personnel STIHL recom mends that maintenance and repair work be car ried out only by authorised STIHL dealers The following intervals must be complied with Full time use quarterly Part time use every six months occasional use Annually 15 Starting Stopping the Engine 15 1 Positions of the Master Control lever 2011BA042 KN Stop 0 engine off the ignition is swi...

Page 23: ... KN clamp the rear handle between the knees or thighs Hold the front handle firmly with your left hand your thumb should be under the handle 15 6 Actuating Pull the starter grip slowly with your right hand until you feel it engage and then give it a brisk strong pull and push down the front han dle at the same time Do not pull out the starter rope to full length it might otherwise break Do not let...

Page 24: ...he engine settles down to idling speed 2011BA001 KN Pull the hand guard toward the handlebar to disengage the chain brake NOTICE Open the throttle only when the chain brake is off Increased engine speeds with the chain brake on saw chain is stationary will quickly damage the clutch and chain brake After a cold start warm up the engine at vary ing speeds your saw is ready for operation 15 10 At Ver...

Page 25: ...5 tank fillings 16 2 During work NOTICE Do not make the mixture leaner to achieve an apparent increase in power this could damage the engine see Adjusting the Carburetor NOTICE Open the throttle only when the chain brake is off Running the engine at high revs with the chain brake engaged chain locked will quickly damage the shortblock and chain drive clutch chain brake 16 2 1 Check chain tension f...

Page 26: ... 3 8 0 325 6 0 mm Rapid 0 404 7 0 mm If groove depth is less than specified Replace the guide bar The drive link tangs will otherwise scrape along the bottom of the groove the cutters and tie straps will not ride on the bar rails 18 Cleaning the Air Filter 18 1 If there is a noticeable loss of engine power 2011BA024 KN Turn the twist lock 90 counterclockwise Remove the shroud upwards 2011BA025 KN ...

Page 27: ...ng is too lean Turn the low speed screw L carefully coun terclockwise no further than stop until the engine runs smoothly and accelerates well It is usually necessary to change the setting of the idle speed screw LA after every correction to the low speed screw L 19 5 Fine Tuning for Operation at High Altitude A slight correction of the setting may be neces sary if the engine does not run satisfac...

Page 28: ... and connect the spark plug boot press it down firmly reassembly all other parts in the reverse sequence 21 Storing the Machine For periods of about 30 days or longer Drain and clean the fuel tank in a well ventila ted area Dispose of fuel properly in accordance with local environmental requirements If a manual fuel pump is fitted Press the man ual fuel pump at least 5 times Start the engine and r...

Page 29: ...for cracks and damaged rivets Replace damaged or worn chain components and adapt these parts to the remaining parts in terms of shape and level of wear rework accordingly Carbide tipped Duro saw chains are especially wear resistant For an optimal sharpening result STIHL recommends STIHL servicing dealers WARNING Compliance with the angles and dimensions lis ted below is absolutely necessary An imp...

Page 30: ...pth gauge setting and tooth length as well as clean ing grooves and oil inlet holes 23 6 Proper sharpening Select sharpening tools in accordance with chain pitch Clamp guide bar if necessary Block saw chain push the hand guard for ward To advance the saw chain pull the hand guard toward the handlebar The chain brake is disengaged With the Quickstop Super chain brake system additionally press the t...

Page 31: ...ring the depth gauges The depth gauge setting is lowered when the cutter is sharpened Check the depth gauge setting after each sharpening 2 689BA061 KN 1 Lay the appropriate file gauge 1 for the chain pitch on the saw chain and press it against the cutter to be checked if the depth gauge pro trudes past the file gauge the depth gauge must be reworked Saw chains with humped drive link 2 upper part ...

Page 32: ...es mm mm Inches Part number Part number Part number Part number Part number 1 4P 6 35 3 2 1 8 5605 771 3206 5605 750 4300 0000 893 4005 0814 252 3356 5605 007 1000 1 4 6 35 4 0 5 32 5605 772 40065605 750 43271110 893 40000814 252 33565605 007 1027 3 8 P 9 32 4 0 5 32 5605 772 4006 5605 750 4327 1110 893 4000 0814 252 3356 5605 007 1027 0 325 8 25 4 8 3 16 5605 772 4806 5605 750 4328 1110 893 4000 ...

Page 33: ...dent on equipment Function test X X Chain brake Function test X X Have checked by dealer1 X Manual fuel pump if present check X Have repaired by a specialist dealer1 X Fuel pick up body filter in fuel tank check X Clean replace filter insert X X replace X X X Fuel tank Clean X Lubricating oil tank Clean X Chain lubrication check X Saw chain Check pay attention to sharpness X X Checking the chain t...

Page 34: ...is responsible for all damage caused by non observance of the safety precautions oper ating and maintenance instructions in this man ual This includes in particular Alterations or modifications to the product not approved by STIHL Using tools or accessories which are neither approved or suitable for the product or are of a poor quality Using the product for purposes for which it was not designed U...

Page 35: ...pending on the type and duration of use have to be replaced in good time Among other parts this includes Saw chain guide bar Drive components clutch clutch drum chain sprocket Filters air oil fuel Starter mechanism Spark plug Components of antivibration system 26 Main Parts 20 19 24 21 7 2011BA031 KN 1 3 2 6 8 4 5 9 12 13 14 15 16 17 18 23 22 25 10 11 1 Carburetor box cover twist lock 2 Carburetor...

Page 36: ...ove width 1 1 mm 27 6 3 1 4 P chains Picco Micro 3 71 PM3 Type 3670 Pitch 1 4 P 6 35 mm Drive link gauge 1 1 mm 27 6 4 Chain sprocket 8 tooth for 1 4 spur sprocket Max chain speed according to ISO 11681 22 5 m s Chain speed at maximum power 16 9 m s 27 7 Sound and Vibration Levels For further details on compliance with Vibration Directive 2002 44 EC see www stihl com vib 27 7 1 Sound pressure leve...

Page 37: ...in in the spaces provided This will make re ordering simpler The guide bar and saw chain are subject to nor mal wear and tear When purchasing these parts always quote the saw model the part numbers and names of the parts Model Serial number Guide bar part number Chain part number 30 Maintenance and Repairs Users of this machine may only carry out the maintenance and service work described in this ...

Page 38: ...64823 Groß Umstadt Certification No K EG 2018 8633 Technical documents deposited at ANDREAS STIHL AG Co KG Produktzulassung The year of manufacture and serial number are applied to the product Done at Waiblingen 03 02 2020 ANDREAS STIHL AG Co KG pp Dr Jürgen Hoffmann Director Product Certification Regulatory Affairs 33 UKCA Declaration of Con formity ANDREAS STIHL AG Co KG Badstr 115 D 71336 Waibl...

Page 39: ...ing Certification Ltd Academy Place 1 9 Brook Street Brentwood Essex CM14 5NQ United Kingdom Certification No ITS UK MCR 65 Technical documents deposited at ANDREAS STIHL AG Co KG The year of manufacture and serial number are applied to the product Waiblingen 31 03 2022 ANDREAS STIHL AG Co KG pp Dr Jürgen Hoffmann Director Product Certification Regulatory Affairs 33 UKCA Declaration of Conformity ...

Page 40: ...www stihl com 04585060121C 04585060121C 0458 506 0121 C 0458 506 0121 C ...

Search results

Summary of Contents for MS 151 C

Reviews:

Related manuals for MS 151 C

Brands by name

Popular brands

Stihl MS 151 C, Instruction Manual

Search results

Summary of Contents for MS 151 C

Reviews:

Related manuals for MS 151 C

Brands by name

Popular brands