Stihl MS 170, MS 180 Instruction Manual

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STIHL MS 170, 180

Instruction Manual

Contents

English

Guide to Using this Manual 2 Safety Precautions 3 Reactive Forces 8 Working Techniques 9 Cutting Attachment 18 Mounting the Bar and Chain (front

chain tensioner) 18 Mounting the Bar and Chain (quick

chain tensioner) 19

Original Instruction ManualPrinted on chlorine-free paper

Tensioning the Saw Chain (front chain tensioner) 21

Tensioning the Saw Chain (quick chain tensioner) 22

Checking Chain Tension 22 Fuel 22 Fueling 23 Chain Lubricant 24 Filling Chain Oil Tank 24 Checking Chain Lubrication 25 Chain Brake 25 Starting / Stopping the Engine 26 Operating Instructions 30

Printing inks contain vegetable oils, paper can be recycled.

Taking Care of the Guide Bar 31 Shroud 31 Cleaning the Air Filter 32 Adjusting the Carburetor 32 Spark Arresting Screen in Muffler 33 Spark Plug 33 Storing the Machine 34 Checking and Replacing the Chain

Sprocket 34

Maintaining and Sharpening the Saw Chain 35

Maintenance and Care 39 Main Parts 41 Specifications 42 Ordering Spare Parts 43 Maintenance and Repairs 44 Disposal 44 EC Declaration of Conformity 44

Dear Customer,

Thank you for choosing a quality engineered STIHL product.

It has been built using modern production techniques and comprehensive quality assurance. Every effort has been made to ensure your satisfaction 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

0458-207-8321-B. VA2.J20.

0000006694_008_GB

MS 170, MS 170 C, MS 180, MS 180 C

English

Guide to Using this Manual

This Instruction Manual refers to a STIHL chain saw, also called a machine in this Instruction Manual.

Pictograms

Pictograms that appear on the machine are explained in this Instruction Manual.

Depending on the machine and equipment version, the following pictograms may appear on the machine.

Fuel tank; fuel mixture of gasoline and engine oil

Tank for chain oil; chain oil

Engage and release chain brake

Coasting brake

Intake air baffle: winter operation

Intake air baffle: summer operation

Handle heating

Actuate decompression valve

Actuate manual fuel pump

Symbols in text

WARNING

Warning where there is a risk of an accident or personal injury or serious damage to property.

Engineering improvements

STIHL's philosophy is to continually improve all of its products. For this reason we may modify the design, engineering and appearance of our products periodically.

Therefore, some changes, modifications and improvements may not be covered in this manual.

Direction of chain travel

Ematic; chain oil flow adjustment

Tension saw chain

NOTICE

Caution where there is a risk of damaging the machine or its individual components.

MS 170, MS 170 C, MS 180, MS 180 C

English

Safety Precautions

Special safety precautions must be observed to reduce the risk of personal injury when working with a chain saw because of the very high chain speed and very sharp cutters.

It is important that you read the instruction manual before first use and keep it in a safe place for future reference. Nonobservance of the instruction manual may result in serious or even fatal injury.

General

Observe all applicable local safety regulations, standards and ordinances.

The use of noise emitting power tools may be restricted to certain times by national or local regulations.

If you have not used this model before: Have your dealer or other experienced user show you how to operate your machine or attend a special course in its operation.

Minors should never be allowed to use a chain saw.

Keep bystanders, especially children, and animals away from the work area.

The user is responsible for avoiding injury to third parties or damage to their property.

Do not lend or rent your chain saw without the instruction manual. Be sure that anyone using it understands the information contained in this manual.

To operate a chain saw 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 conditions (rain, snow, ice, wind).

Persons with pacemakers only: The ignition system of your chain saw produces an electromagnetic field of a very low intensity. This field may interfere with some pacemakers. To reduce health risks, STIHL recommends that persons with pacemakers consult their physician and the pacemaker manufacturer before operating this power tool.

Intended use

The machine may only be used to saw wood and wooden objects.

Do not use the machine for any other purpose – risk of accidents!

Do not modify the machine in any way – this may increase the risk of personal injury. STIHL excludes all liability for personal injury and damage to property caused while using unauthorised attachments.

Clothing and Equipment

Wear proper protective clothing and equipment.

Clothing must be sturdy and snug-fitting, but allow complete freedom of movement. Wear snug fitting clothing with cutretardant pads – no loose-fitting jacket.

Avoid clothing that could get caught on branches, brush or moving parts of the machine. Do not wear a scarf, necktie or jewellery. Tie up and confine long hair (headscarf, cap, hard hat, etc.).

Wear suitable safety shoes – with cut-retardant material, non-slip soles and steel toe caps.

WARNING

To reduce the risk of eye injuries, wear tight-fitting safety goggles conforming to standard EN 166 or a face shield. Make sure that the safety goggles and the face shield fit correctly.

Wear "personal" hearing protection – for example, ear defenders.

Wear a hard hat wherever there is any risk of falling objects.

MS 170, MS 170 C, MS 180, MS 180 C

English

001BA115 KN

Wear sturdy protective gloves made of a resistant material (e.g. leather).

STIHL can supply a comprehensive range of personal protective equipment.

Transport

Before any transport – even over short distances – switch off the machine, engage the chain brake and attach the chain scabbard. This avoids the risk of the saw chain starting unintentionally.

Always carry the chain saw by the handle – with the hot muffler away from your body, the guide bar must point to the rear. Avoid touching hot parts of the machine, especially the surface of the muffler – risk of burns!

In vehicles: Properly secure the machine to prevent tipping, damage and chain oil or fuel spillage.

Cleaning

Clean plastic parts with a cloth. Harsh detergents can damage the plastic.

Clean the dust and dirt off the machine – do not use any grease solvents for this purpose.

Clean the ventilation slots if necessary.

Do not use a high-pressure cleaner to clean the machine. The hard jet of water can damage parts of the machine.

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 and damage to the machine.

STIHL recommends the use of genuine STIHL tools, guide bars, chains, chain sprockets and accessories. They are specifically designed to match your model and meet your performance requirements.

Refuelling

Gasoline is an extremely flammable fuel – keep clear of naked flames and fire – do not spill any fuel – no smoking.

Switch off the engine before refuelling.

Never refuel the machine while the engine is still hot – the fuel may spill over – risk of fire!

Open the fuel filler cap carefully so that any excess pressure is relieved gradually and fuel does not splash out.

The machine may only be refuelled in a well ventilated place. Clean the machine immediately if fuel is spilled. Do not spill fuel over your clothing – contaminated clothing must be changed immediately.

The machines can be equipped with the following filler caps as standard:

Screw-type tank cap

After fueling, tighten down the screw-type fuel cap as securely as possible.

This reduces the risk of unit vibrations causing the fuel cap to loosen or come off and spill quantities of fuel.

Check for leakage. To reduce the risk of serious of fatal burn injuries, do not start or run the engine until leak is fixed.

Before Starting Work

Check that your saw is properly assembled and in good condition – refer to appropriate chapters in the instruction manual.

– Check the fuel system for leaks,

paying special attention to visible parts such as the tank cap, hose connections and the manual fuel pump (on machines so equipped). If

MS 170, MS 170 C, MS 180, MS 180 C

English

001BA087 LÄ

there are any leaks or damage, do not start the engine – risk of fire. Have your saw repaired by a servicing dealer before using it again.

– Check operation of chain brake,

front hand guard

– Correctly mounted guide bar

– Correctly tensioned chain

– The trigger and trigger lockout must

move freely and spring back to the idle position when they are released.

– Master Control lever must move

easily to STOP, 0 or †

– Check that the spark plug boot is

secure – a loose boot may cause arcing that could ignite combustible fumes and cause a fire.

– Never attempt to modify the controls

or safety devices in any way.

– Keep the handles dry and clean –

free from oil and dirt – for safe control of the saw.

– Make sure there is sufficient fuel

and chain oil in the tanks.

To reduce the risk of personal injury, do not operate your saw if it is damaged or not properly assembled.

Starting the chain saw

Always work on a level surface. Ensure a firm and secure footing. Hold the machine securely – the chain must not touch any objects or the floor – danger of injury due to the rotating saw chain.

Your chain saw is a one-person saw. Do not allow other persons to be in the working 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 starting – risk of injury due to rotating chain!

Do not drop-start the engine – start as described in the Instruction Manual.

During operation

Ensure you always have a firm and safe footing. Take special care when the bark is wet – danger of slipping!

Always hold the chain saw firmly with both hands: Right hand on the rear handle – even if you are left-handed. To ensure reliable control, wrap your thumbs tightly around the handlebar and handle.

In the event of impending danger or in an emergency, switch off the engine immediately by moving the Master Control lever / stop switch to STOP, 0 or †.

Never let the machine run unattended.

Exercise caution with slippery surfaces, water, snow, ice, steep slopes, uneven ground or green wood that has just been stripped of its bark – danger of slipping!

Use caution with tree stumps, roots, ditches – danger of stumbling!

Do not work alone – keep within calling distance of others who are trained in emergency procedures and can provide help in an emergency. Helpers at the cutting site must also wear protective clothing (helmet!) and stand well clear of the branches being cut.

More care and attention than usual are required when wearing ear protection, as warning sounds (shouts, beeps, etc.) cannot be heard properly.

Take a break in good time to avoid tiredness or exhaustion – risk of accidents!

Dust (e. g., sawdust), fumes and smoke produced while using the machine may be hazardous to health. If dust is generated, wear a dust mask.

When the engine is running: Note that the saw chain continues to rotate for a short period after you let go of the throttle trigger – coasting effect.

No smoking when working with or near the chain saw - risk of fire! Combustible fuel vapour may escape from the fuel system.

MS 170, MS 170 C, MS 180, MS 180 C

English

Examine the saw chain periodically at short intervals and as soon as you note any tangible changes:

– Switch off the engine; wait until the

saw chain is stationary

– Check condition and secure fitting

– Check sharpness

Never touch the saw chain when the engine is running. If the saw chain becomes jammed by an object, switch off the engine immediately before attempting to remove the object – risk of injury!

Always turn off the engine before leaving the machine unattended.

To change the saw chain, switch off the engine. Risk of injury from the motor starting unintentionally!

Keep easily combustible materials (e. g., wood chips, bark, dry grass, fuel) away from hot exhaust gases and hot mufflers – risk of fire! Mufflers with catalytic converters can become especially hot.

Never work without chain lubrication – monitor the oil level in the oil tank. Stop work immediately if the oil level in the oil tank is too low and top up with chain oil – see also "Topping up with chain oil" and "Check chain lubrication".

If the machine is subjected to unusually high loads for which it was not designed (e. g., heavy impact or a fall), always check that it is in good condition before continuing work – see also "Before starting work".

Check the fuel system for leaks and make sure the safety devices are working properly. Never continue using

a machine that is not in perfect working order. In case of doubt, have the unit checked by your servicing dealer.

Check for correct idling, so that the saw chain stops moving when the throttle trigger 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 colourless and odourless and may contain unburnt hydrocarbons and benzene. Never work with the machine indoors or in poorly ventilated areas, even if your machine is equipped with a catalytic converter.

Ensure proper ventilation when working in trenches, hollows or other confined locations – risk of fatal injury from breathing toxic fumes!

If you feel sick, have a headache, vision problems (e. g., your field of vision gets smaller), hearing problems, dizziness or inability to concentrate, stop work immediately. Such symptoms may be caused by an excessively high concentration of exhaust emissions – risk of accident!

After finishing work

Switch off the motor, engage the chain brake and attach the chain scabbard.

Storage

When the machine is not in use, it should be stored in such a way that noone is endangered. Secure the machine against unauthorised use.

Store the machine in a safe, dry room.

Vibrations

Prolonged use of the power tool may result in vibration-induced circulation problems in the hands (whitefinger disease).

No general recommendation can be given for the length of usage because it depends on several factors.

The period of usage is prolonged by:

– Hand protection (wearing warm

gloves)

– Work breaks

The period of usage is shortened by:

– Any personal tendency to suffer

from poor circulation (symptoms: frequently cold fingers, tingling sensations).

– Low outside temperatures.

– The force with which the handles

are held (a tight grip restricts circulation).

Continual and regular users should monitor closely the condition of their hands and fingers. If any of the above symptoms appear (e.g. tingling sensation in fingers), seek medical advice.

MS 170, MS 170 C, MS 180, MS 180 C

English

Maintenance and repairs

Always switch off the engine before any repair, cleaning or maintenance work and any work on the chain. Risk of injury if the engine starts inadvertently!

Exception: adjustment of carburettor and idle speed.

The machine must be serviced regularly. Do not attempt any maintenance or repair work not described in the Instruction Manual. All other work should be carried out by a servicing dealer.

STIHL recommends that maintenance and repair work be carried out only by authorised STIHL dealers. STIHL dealers receive regular training and are supplied with technical information.

Use only high-quality spare parts. Otherwise, there may be a risk of accidents and damage to the machine. If you have any questions in this respect, consult a servicing dealer.

Do not modify the machine in any way – this may increase the risk of personal injury –risk of accidents!

To reduce the risk of fire due to ignition outside the cylinder, move the master control level to STOP, 0 or † before turning the engine over on the starter when the spark plug boot is removed or the spark plug is unscrewed!

Do not service or store the machine near a naked flame – risk of fire due to the fuel.

Check fuel cap regularly for tightness.

Use only spark plugs that are in perfect condition and have been approved by STIHL – see "Specifications".

Check ignition lead (insulation in good condition, secure connection).

Check that the muffler is in perfect working condition.

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 influences vibration behaviour – inspect anti-vibration elements periodically.

Inspect chain catcher – replace if damaged.

Switch off the engine

– To check the chain tension

– To retension the chain

– To replace the chain

– For remedying malfunctions

Observe sharpening instructions – for safe and proper handling, always keep the chain and guide bar in flawless condition. Keep the chain properly sharpened, tensioned and well lubricated.

Change chain, guide bar and chain sprocket in due time.

Regularly check that the clutch drum is in perfect working condition.

Always store fuel and chain lubricant only in the specified type of containers and ensure they are correctly labelled. Store in a dry, cool and secure place protected against light and sunlight.

In the event of a chain brake malfunction, switch off the machine immediately – risk of injury! Consult a

servicing dealer – do not use the machine until the malfunction has been remedied, see "Chain brake".

MS 170, MS 170 C, MS 180, MS 180 C

English

001BA036 KN

001BA257 KN

001BA037 KN

Reactive Forces

The most common reactive forces are: kickback, pushback and pull-in.

Dangers of kickback

Kickback can result in fatal cuts.

Kickback occurs if, for example,

– The saw chain in the area of the

upper quarter of the guide bar nose unintentionally comes into contact with wood or a solid object – e. g., unintentionally touches another limb during limbing

– The saw chain at the nose of the

guide bar is briefly pinched in the cut

QuickStop chain brake:

This device reduces the risk of injury in certain situations – it cannot prevent kickback. If activated, the brake stops the saw chain within a fraction of a second – refer to chapter "Chain brake" in this Instruction Manual.

– Be especially careful with small,

tough limbs, undergrowth and offshoots – the saw chain may become caught in them

– Never cut several limbs at once

– Do not lean too far forward

– Do not cut above shoulder height

– Use extreme caution when re-

entering a previous cut

– Do not attempt plunge cuts if you

are not experienced in this cutting technique

– Be alert for shifting of the log or

other forces that may cause the cut to close and pinch the chain

– Always cut with a correctly

sharpened, properly tensioned saw chain – the depth gauge setting must not be too large

– Use low-kickback saw chains as

well as narrow-radius guide bars

Pull-in (A)

Kickback occurs when the saw is suddenly thrown up and back in an uncontrolled arc towards the operator.

Reducing the risk of kickback

– Work cautiously and methodically

– Hold the chain saw firmly with both

hands and maintain a secure grip

– Always cut at full throttle

– Be awar e of th e loc ation of the guide

bar nose

– Do not cut with the guide bar nose

When the chain on the bottom of the bar – overbucking – is suddenly pinched, caught or encounters a foreign object in the wood, the chain saw may suddenly

MS 170, MS 170 C, MS 180, MS 180 C

English

001BA038 KN

be drawn forward toward the log – to avoid this, engage the bumper spike firmly in the wood.

Pushback (B)

When the chain on the top of the bar – underbucking – is suddenly pinched, caught or encounters a foreign object in the wood, the chain saw may suddenly be driven straight back toward the operator – to avoid this:

– Do not allow the top of the guide bar

to become jammed

– Do not twist the guide bar in the cut

Be very careful

– With freely hanging limbs

– With trunks that are under tension

between other trees because they fell unfavourably

– When working in windbreaks

In these cases, do not use a chain saw – use a hoist, winch or dragline instead.

Pull out trunks that are lying about and have been cut free. Whenever possible, deal with them in open areas.

Dead wood (brittle, rotten or dead wood) poses a significant, highly unpredictable hazard. It is extremely difficult or even practically impossible to recognise the danger. Use aids such as winches or draglines.

When felling close to roads, rail lines, power lines, etc., work with particular care. If necessary, notify police, power companies or railway authorities.

Working Techniques

Sawing and felling work, including all related work (plunge cutting, limbing, etc.) may only be carried out by persons who have been specially trained and instructed. Persons who are not experienced chain saw users should not carry out any such work – increased risk of accidents!

Country-specific legislation on felling technique must be complied with during felling work.

Cutting

Do not operate your saw with the starting throttle lock engaged. Engine speed cannot be controlled with the throttle trigger in this position.

Work calmly and carefully – in daylight conditions and only when visibility is good. Ensure you do not endanger others – stay alert at all times.

First-time users are advised to practice cutting logs on a sawhorse – see "When cutting small logs".

Use the shortest possible guide bar: The chain, guide bar and chain sprocket must match each other and your saw.

MS 170, MS 170 C, MS 180, MS 180 C

English

001BA082 KN

001BA033 KN

Position the saw so that your body is clear of the cutting attachment.

Always pull the saw out of the cut with the chain running.

Use your chain saw for cutting only. It is not designed for prying or shoveling away limbs, roots or other objects.

Do not underbuck freely hanging limbs.

Take care when cutting scrub and young trees. The saw chain may catch and throw thin shoots in your direction.

To reduce the risk of injury, take special care when cutting shattered wood because of the risk of injury from slivers being caught and thrown in your direction.

Make sure your saw does not touch any foreign materials: Stones, nails, etc. may be flung off and damage the saw chain. The saw may kick back unexpectedly – risk of accidents.

If the rotating chain makes contact with a rock or other solid object there is a risk of sparking which may cause easily combustible material to catch fire under certain circumstances. Dry plants and scrub are also easily combustible, especially in hot and dry weather conditions. If there is a risk of fire, do not use your chainsaw near combustible

materials, dry plants or scrub. Always contact your local forest authority for information on a possible fire risk.

If on a slope, stand on the uphill side of the log. Watch out for rolling logs.

When working at heights:

– Always use a lift bucket

– Never work on a ladder or in a tree

– Never work on an insecure support

– Do not work above shoulder height

– Never operate your power tool with

one hand

Begin cutting with the saw at full throttle and engage the spiked bumper firmly in the wood, and then continue cutting.

Never work without the spiked bumper because the saw may pull you forwards and off balance. Always engage the spiked bumper securely in the tree or limb.

Note when reaching the end of a cut that the saw is no longer supported in the kerf. You have to take the full weight of the machine since it might otherwise go out of control.

When cutting small logs:

– Use a sturdy and stable support –

sawhorse.

– Never hold the log with your leg or

foot.

– Never allow another person to hold

the log or help in any other way.

Limbing:

– Use a low kickback chain.

– Work with the saw supported

wherever possible.

– Do not stand on the log while

limbing it.

– Do not cut with the bar nose.

– Watch for limbs which are under

tension.

– Never cut several limbs at once.

Lying or standing logs under tension:

Always make cuts in the correct sequence (first at the compression side (1), then at the tension side (2), the saw may otherwise pinch or kick back – risk of injury.

MS 170, MS 170 C, MS 180, MS 180 C

N Make relieving cut at the

001BA151 KN

001BA152 KN

001BA189 KN

001BA088 LÄ

1 1

compression side (1)

N Make bucking cut at the tension

side (2)

Be wary of pushback when making bucking cut from the bottom upwards (underbuck).

NOTICE

Do not cut a lying log at a point where it is touching the ground because the saw chain will otherwise be damaged.

Ripping cut:

Cutting technique in which the spiked bumper is not used – risk of pull-in – start the cut with the guide bar at the shallowest possible angle – take extra care since there is an increased danger of kickback.

Preparing for felling

Check that there are no other persons in the felling area – other than helpers.

Make sure no-one is endangered by the falling tree – the noise of your engine may drown any warning calls.

English

Maintain a distance of at least 2 1/2 tree lengths from the next felling site.

Determining direction of fall and escape path

Select gap in stand into which you want the tree to fall.

Pay special attention to the following points:

– The natural inclination of the tree

– Unusually heavy limb structure,

asymmetrical growth, damage to tree

– The wind direction and speed – do

not fell in high winds

– Direction of slope

– Neighboring trees

– Snow load

– Take the general condition of the

tree into account – be especially careful with trunk damage or deadwood (brittle, rotten or dead wood)

MS 170, MS 170 C, MS 180, MS 180 C

English

001BA040 KN

45°

001BA146 KN

001BA271 KN

A Direction of fall B Escape path (escape routes)

– Establish escape paths for each

worker – approx. 45° diagonally opposite to the direction of fall

– Clear escape paths, eliminate

obstacles

– Put down tools and equipment at a

safe distance – but not on the escape paths

– When felling, stand only to the side

of the falling trunk and only move back laterally onto the escape path

– Plan escape paths on slopes

parallel to the slope

– When walking away along the

escape path, watch out for falling limbs and watch the top of the tree.

Preparing work area at base of tree

– First clear the tree base and work

area from interfering limbs and brush to provide a secure footing.

– Carefully clear the base of the trunk

(e.g., with an axe) – sand, stones and other foreign objects will blunt the saw chain

– Remove largest buttresses: first the

largest buttress – saw first vertically, then horizontally – only if the tree is in sound condition

Felling notch

Preparing the felling notch

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 trunk

MS 170, MS 170 C, MS 180, MS 180 C

English

001BA153 KN

001BA150 KN

Determine direction of fall with gunning sight on cover and fan housing

Your chainsaw has a gunning sight on the cover and fan housing. Use this gunning sight.

Making the felling notch

When making a felling notch, align the chainsaw so that the notch lies at a right angle to the direction of fall.

During the procedure, various sequences are permitted for making a felling notch with a bottom (horizontal) cut and top (angled) cut – comply with national legislation regarding felling technique.

N Make a bottom (horizontal) cut N Make the top (angled) cut

approx. 45°- 60° to the bottom cut

Checking the direction of fall

N In ser t th e chain saw wit h gu ide bar in

the bottom of the felling notch. The gunning sight must point in the planned direction of fall – if necessary, correct direction of fall by re-cutting the felling notch.

Sapwood cuts

Sapwood cuts in long-fibered softwood help prevent sapwood 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.

Basic information on felling cut

Basic dimensions

1/10

The felling notch (C) determines the direction of fall.

The hinge (D) functions like a real hinge to guide the tree to the ground.

– Width of hinge: approx. 1/10 of the

trunk diameter

– Never saw through the hinge while

felling – otherwise the tree will fall in a direction other than the one planned – risk of accident!

– With rotten trunks, leave a wider

hinge

001BA259 KN

MS 170, MS 170 C, MS 180, MS 180 C

English

001BA269 KN

001BA270 KN

001BA260 KN

The tree is felled with the felling cut (E).

– Cut horizontally

– 1/10 (at least 3 cm) of tree diameter

higher than bottom of felling notch (C).

The holding strap (F) or stabilizing strap (G) supports the tree and helps prevent it from falling prematurely.

– Width of strip: approx. 1/10 to 1/5 of

the trunk diameter

– Do not cut into the strip during the

felling cut

– With rotten trunks, leave a wider

strip

Plunge cutting

– For relieving cuts during shortening

– For wood carving

N Use a low kickback saw chain and

proceed with special care

1. Begin cut by applying the lower portion of the guide bar nose – do not use upper portion because of risk of kickback. Cut at full strength until the depth of the kerf is twice the width of the guide bar

2. Swing the machine slowly into the plunge cutting position – risk of kickback and pushback!

3. Make the plunge cut very carefully. Risk of pushback.

Where possible, use a plunge blade. The plunge blade and the upper/lower side of the guide bar are parallel.

During plunge cutting, the plunge bar helps to keep the hinge parallel in form, i.e. the same thickness at all points. To do this, guide the plunge bar parallel to the sink chord.

Felling wedges

Insert the felling wedge as soon as possible, i.e. as soon as no obstruction of saw control is to be expected. Position the felling 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 (analogue to felling cut (E)).

Contact the STIHL dealer for the selection of the felling wedge (suitable length, width and height).

Selecting the appropriate felling cut

The selection of the appropriate felling cut is dependent on the same tree characteristics that must be noted when determining the direction of fall and the escape paths.

There are various different features of these characteristics. This User Manual will only describe the two most commonly occurring variants:

left: Normal tree – vertically

upright tree with uniform crown

right: Leaner tree - crown pointing in

direction of fall

MS 170, MS 170 C, MS 180, MS 180 C

English

001BA261 KN

001BA273 KN

001BA263 KN

Felling cut with stabilizing strap (normal tree)

A) Thin trunks

Implement this felling cut when the trunk diameter is smaller than the cutting length of the chainsaw.

Shout a warning before starting the felling cut.

N Plunge cut the felling cut (E) –

plunge the guide bar fully in

N Engage the spiked bumper behind

the hinge and use this as the rotation point – reposition the chainsaw as little as possible

N Make the felling cut up to the

hinge (1)

– Do not cut into the hinge N Make the felling cut up to the

stabilizing strap (2)

– Do not cut into the stabilizing strap

N Set the felling wedge (3)

Shout a second warning immediately before the tree falls.

N Cut through the stabilizing strap,

horizontal level with the felling cut, with arms fully extended

B) Thick trunks

Implement this felling cut when the trunk diameter is greater than the cutting length of the machine.

Shout a warning before starting the felling cut.

N Engage the spiked bumper at the

height of the felling cut and use this as the rotation point – reposition the chainsaw as little as possible

N Tip of the guide bar must penetrate

the wood before the hinge (1) – guide the chainsaw absolutely horizontally and swivel as widely as possible

N Make the felling cut up to the

hinge (2)

– Do not cut into the hinge N 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 opposite side of the trunk.

Ensure that the second cut is at the same level as the first cut.

MS 170, MS 170 C, MS 180, MS 180 C

English

001BA274 KN

001BA265 KN

001BA266 KN

N Plunge cut the felling cut N Make the felling cut up to the

hinge (4)

– Do not cut into the hinge N Make the felling cut up to the

stabilizing strap (5)

– Do not cut into the stabilizing strap

N Set the felling wedge (6)

Shout a second warning immediately before the tree falls.

N Cut through the stabilizing strap,

horizontal level with the felling cut, with arms fully extended

Felling Cut with Holding Strap (Leaner)

A) Thin trunks

Implement this felling cut when the trunk diameter is smaller than the cutting length of the chainsaw.

N Plunge cut the guide bar into the

trunk until it exits on the other side

N Make the felling cut (E) towards the

hinge (1)

– Cut horizontally

– Do not cut into the hinge

N Make the felling cut towards the

holding strap (2)

– Cut horizontally

– Do not cut into the holding strap.

Shout a second warning immediately before the tree falls.

N With outstretched arms, cut through

the holding strap at a downward angle from outside.

MS 170, MS 170 C, MS 180, MS 180 C

English

001BA267 KN

001BA268 KN

B) Thick trunks

Perform this felling cut when the tree diameter is greater than the cutting length of the chainsaw.

N Engage the spiked bumper behind

the holding strap and use it as a pivot – avoid repositioning the chainsaw more than necessary.

N The guide bar nose enters the

wood (1) before it reaches the hinge – hold the chainsaw horizontally and swing it as far as possible.

– Do not cut into the holding strap or

hinge.

N Make the felling cut up to the

hinge (2)

– Do not cut into the hinge N Make the felling cut up to the

holding strap (3)

– Do not cut into the holding strap.

MS 170, MS 170 C, MS 180, MS 180 C

The felling cut must be continued on the opposite side of the trunk.

Ensure that the second cut is at the same level as the first cut.

N Engage the spiked bumper behind

the hinge and use this as the rotation point – reposition the chainsaw as little as possible

N Tip of the guide bar must penetrate

the wood before the holding strap (4) – guide the chainsaw absolutely horizontally and swivel as widely as possible

N Make the felling cut up to the

hinge (5)

– Do not cut into the hinge N Make the felling cut up to the

holding strap (6)

– Do not cut into the holding strap.

Shout a second warning immediately before the tree falls.

N With outstretched arms, cut through

the holding strap at a downward angle from outside.

English

001BA248 KN

001BA244 KN

143BA034 KN

207BA009 KN

Cutting Attachment

A cutting attachment consists of the saw chain, guide bar and chain sprocket.

The cutting attachment that comes standard is designed to exactly match the chain saw.

– The pitch (t) of the saw chain (1),

chain sprocket and the nose sprocket of the Rollomatic guide bar must match.

– The drive link gauge (2) of the saw

chain (1) must match the groove width of the guide bar (3).

If non-matching components are used, the cutting attachment may be damaged beyond repair after a short period of operation.

Chain Scabbard

Your saw comes standard with a chain scabbard that matches the cutting attachment.

If guide bars of different lengths are mounted to the saw, always use a chain scabbard of the correct length which covers the complete guide bar.

The length of the matching guide bars is marked on the side of the chain scabbard.

Mounting the Bar and Chain (front chain tensioner)

Removing the chain sprocket cover

N Unscrew the nut and remove the

chain sprocket cover.

N Turn the screw (1)

counterclockwise until the tensioning nut (2) butts against the left end of the housing slot.

MS 170, MS 170 C, MS 180, MS 180 C

English

001BA186 KN

143BA003 KN

207BA010 KN

2310BA013 KN

2310BA014 KN

Disengage the chain brake.

N Pull the hand guard towards the

front handle until there is an audible click – the chain brake is disengaged.

Fitting the chain

N Fit the guide bar over the studs (1) –

the cutting edges on the top of the bar must point to the right.

N Engage the peg of the tensioner

slide in the locating hole (2) –- place the chain over the sprocket (3) at the same time.

N Turn the tensioning screw (4)

clockwise until there is very little chain sag on the underside of the bar – and the drive link tangs are engaged in the bar groove.

N Refit the sprocket cover and screw

on the nut only fingertight.

N Go to chapter on "Tensioning the

Saw Chain"

Mounting the Bar and Chain (quick chain tensioner)

Removing the chain sprocket cover

N Swing grip (1) into position (until it

engages)

N Turn the wing nut (2) to the left until

it hangs loosely in the chain sprocket cover (3)

N Remove chain sprocket cover (3)

Mounting the tensioning gear

WARNING

Wear work gloves to protect your hands from the sharp cutters.

N Fit the chain – start at the bar nose.

MS 170, MS 170 C, MS 180, MS 180 C

N Remove and reverse tensioning

gear (1)

English

2310BA015 KN

2310BA016 KN

2310BA017 KN

001BA186 KN

181BA012 KN

181BA013 KN

N Remove screw (2)

N Position tensioning gear (1) and

guide bar (3) relative to one another

Releasing the chain brake

N Pull hand guard towards the front

handle until it engages audibly – chain brake is released

Fitting the saw chain

N Fit the saw chain – starting at the

nose of the guide bar – pay attention to the position of the tensioning gear and the cutting edges

N Turn tensioning gear (1) to the right

as far as possible

N Turn the guide bar so that the

tensioning gear faces the user

N Place the saw chain on the chain

sprocket (2)

N Slide the guide bar over the collar

screw (3); the head of the rear collar screw must protrude into the oblong hole

N Insert and tighten screw (2)

WARNING

Put on protective gloves – risk of injury by the sharp cutters.

MS 170, MS 170 C, MS 180, MS 180 C

English

135BA011 KN

2310BA018 KN

143BA045 KN

N Guide the drive link into the bar

groove (see arrow) and turn the tensioning gear to the left as far as possible

N Fit chain sprocket cover, sliding the

guide lugs into the engine housing openings

N turn the adjusting wheel (4) a little

until the chain sprocket cover can be slid completely against the engine housing

N Swing grip (5) into position (until it

engages)

N Fit wing nut and tighten lightly N Next step: see "Tensioning the Saw

Chain"

Tensioning the Saw Chain (front chain tensioner)

Retensioning during cutting work:

N Switch off the engine. N Loosen the nuts. N Hold the bar nose up. N Use a screwdriver to turn the

tensioning screw (1) clockwise until the chain fits snugly against the underside of the bar.

N While still holding the bar nose up,

tighten down the nuts firmly.

N Go to "Checking Chain Tension".

A new chain has to be retensioned more often than one that has been in use for some time.

N Check chain tension frequently –

see chapter on "Operating Instructions".

When fitting the chain sprocket cover, the teeth of the adjusting wheel and the tensioning gear must mesh; if necessary,

MS 170, MS 170 C, MS 180, MS 180 C

English

001BA112 KN

143BA007 KN

Tensioning the Saw Chain (quick chain tensioner)

Retensioning during cutting work:

N Shut off the engine. N Pull out the hinged clip and loosen

the wingnut.

N Turn the adjusting wheel (1)

clockwise as far as stop.

N Tighten down the wingnut (2) firmly

by hand.

N Fold down the hinged clip. N Go to "Checking Chain Tension"

A new chain has to be retensioned more often than one that has been in use for some time.

N Check chain tension frequently –

see chapter on "Operating Instructions".

Checking Chain Tension

N Shut off the engine. N Wear work gloves to protect your

hands.

N The chain must fit snugly against

the underside of the bar and it must still be possible to pull the chain along the bar by hand.

N If necessary, retension the chain.

A new chain has to be retensioned more often than one that has been in use for some time.

N Check chain tension frequently –

see chapter on "Operating Instructions".

Fuel

Your engine requires a mixture of gasoline and engine oil.

WARNING

For health reasons, avoid direct skin contact with gasoline and avoid inhaling gasoline vapor.

STIHL MotoMix

STIHL recommends the use of STIHL MotoMix. This ready-to-use fuel mix contains no benzol or lead, has a high octane rating and ensures that you always use the right mix ratio.

STIHL MotoMix uses STIHL HP Ultra two-stroke engine oil for an extra long engine life.

MotoMix is not available in all markets.

Mixing Fuel

NOTICE

Unsuitable fuels or lubricants or mix ratios other than those specified may result in serious damage to the engine. Poor quality gasoline or engine oil may damage the engine, sealing rings, hoses and the fuel tank.

Gasoline

Use only high-quality brand-name gasoline with a minimum octane rating of 90 – leaded or unleaded.

MS 170, MS 170 C, MS 180, MS 180 C

English

143BA000 KN

Gasoline with an ethanol content of more than 10% can cause running problems in engines with a manually adjustable carburetor and should not be used in such engines.

Engines equipped with M-Tronic deliver full power when run on gasoline with an ethanol content of up to 25% (E25).

Engine Oil

If you mix the fuel yourself, use only STIHL two-stroke engine oil or another high-performance engine oil in accordance with JASO FB, JASO FC, JASO FD, ISO-L-EGB, ISO-L-EGC or ISO-L-EGD.

STIHL specifies STIHL HP Ultra twostroke engine oil or an equivalent highperformance engine oil in order to maintain emission limits over the machine’s service life.

Mix Ratio

STIHL 50:1 two-stroke engine oil: 50 parts gasoline to 1 part oil

Examples

Gasoline STIHL engine oil 50:1 Liters Liters (ml)

10.02(20) 5 0.10 (100) 10 0.20 (200) 15 0.30 (300) 20 0.40 (400) 25 0.50 (500)

N Use a canister approved for storing

fuel. Pour oil into canister first, then add gasoline and mix thoroughly.

Storing Fuel

Store fuel only in approved safety-type fuel canisters in a dry, cool and safe location protected from light and the sun.

Fuel mix ages – only mix sufficient fuel for a few weeks work. Do not store fuel mix for longer than 30 days. Exposure to light, the sun, low or high temperatures can quickly make the fuel mix unusable.

STIHL MotoMix may be stored for up to 2 years without any problems.

N Thoroughly shake the mixture in the

canister before fueling your machine.

WARNING

Pressure may build up in the canister – open it carefully.

N Clean the fuel tank and canister

from time to time.

Dispose of remaining fuel and cleaning fluid properly in accordance with local regulations and environmental requirements.

Fueling

Preparing the machine

N Before fueling, clean the filler cap

and the area around it so that dirt cannot fall into the tank.

N Always position the machine so that

the filler cap is facing upwards

N Open the filler cap

Refueling

Take care not to spill fuel while fueling and do not overfill the tank.

STIHL recommends use of the STIHL filling system for fuel (special accessory).

WARNING

After fueling, tighten down the filler cap by hand as securely as possible.

Use a suitable tool (e. g., screwdriver of the combination wrench) for slotted filler caps.

MS 170, MS 170 C, MS 180, MS 180 C

English

143BA009 KN

001BA158 KN

Fuel pick-up body replacement

Change the fuel pick-up body every year; to do this:

N Drain the fuel tank N Pull the fuel pick-up body out of the

tank with a hook and disconnect it from the hose

N Connect a new fuel pick-up body to

the hose

N Return the fuel pick-up body to the

tank

Chain Lubricant Filling Chain Oil Tank

For automatic and reliable lubrication of the chain and guide bar – use only an environmentally compatible quality chain and bar lubricant. Rapidly biodegradable STIHL BioPlus is recommended.

NOTICE

Biological chain oil must be resistant to aging (e.g. STIHL BioPlus), since it will otherwise quickly turn to resin. This results in hard deposits that are difficult to remove, especially in the area of the chain drive and chain. It may even cause the oil pump to seize.

The service life of the chain and guide bar depends on the quality of the lubricant. It is therefore essential to use only a specially formulated chain lubricant.

WARNING

Do not use waste oil. Renewed contact with waste oil can cause skin cancer. Moreover, waste oil is environmentally harmful.

NOTICE

Waste oil does not have the necessary lubricating properties and is unsuitable for chain lubrication.

Preparations

N Thoroughly clean the oil filler cap

and the area around it to ensure that no dirt falls into the tank.

N Position the machine so that the

filler cap is facing up.

N Open the filler cap.

Fill up with chain oil.

N Refill the chain oil tank every time

you refuel.

Take care not to spill chain oil while refilling and do not overfill the tank.

STIHL recommends you use the STIHL filler nozzle for chain oil (special accessory).

N Close the filler cap.

There must still be a small amount of oil in the oil tank when the fuel tank is empty.

MS 170, MS 170 C, MS 180, MS 180 C

English

143BA024 KN

143BA011 KN

If the oil level in the tank does not go down, the reason may be a fault in the oil supply system: Check chain lubrication, clean the oilways, contact your dealer for assistance if necessary STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer.

Checking Chain Lubrication

The saw chain must always throw off a small amount of oil.

NOTICE

Never operate your saw without chain lubrication. If the chain runs dry, the whole cutting attachment will be irretrievably damaged within a very short time. Always check chain lubrication and the oil level in the tank before starting work.

Every new chain has to be broken in for about 2 to 3 minutes.

After breaking in the chain, check chain tension and adjust if necessary – see "Checking Chain Tension".

Chain Brake

Locking the chain

– in an emergency

– when starting

– at idling speed

The chain brake is activated by pushing the hand guard toward the bar nose with your left hand – or by inertia in certain kickback situations: The chain is stopped and locked.

MS 170, MS 170 C, MS 180, MS 180 C

English

143BA012 KN

STOP

001BA140 KN

Releasing the chain brake

N Pull the hand guard back toward the

front handle,

NOTICE

Always disengage chain brake before accelerating the engine (except when checking its operation) and before starting cutting work.

High revs with the chain brake engaged (chain locked) will quickly damage the powerhead and chain drive (clutch, chain brake).

The chain brake is also activated by the inertia of the front hand guard if the kickback force of the saw is high enough: The hand guard is accelerated toward the bar nose – even if your left hand is not behind the hand guard, e.g. during felling cut.

The chain brake will operate only if the hand guard has not been modified in any way.

Check operation of the chain brake

Before starting work: Run engine at idle speed, engage the chain brake (push hand guard toward bar nose) and open the throttle wide for no more than 3 seconds – the chain must not rotate. The hand guard must be free from dirt and move freely.

Chain brake maintenance

The chain brake is subject to normal wear. It is necessary to have it serviced and maintained regularly by trained personnel. STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. Maintain the following servicing intervals:

Full-time usage: every 3

months

Part-time usage: every 6

months

Occasional usage: every 12

months

Starting / Stopping the Engine

Positions of the master control lever

Stop 0 – engine off – ignition is switched off

Run F – Engine running or can start Warm start n – this position is for

starting the warm engine – the master control lever returns to run when the throttle trigger is squeezed

Cold start l – this position is for starting the cold engine

MS 170, MS 170 C, MS 180, MS 180 C

English

207BA020 KN

207BA021 KN

Adjusting the master control lever

To adjust the master control lever from run F to cold start l, press and hold down the throttle trigger lockout and throttle trigger simultaneously – set master control lever.

To set the master control lever to warm start n, first set it to cold start l, then push the master control lever into the warm start n position.

Switching to the warm start n position is only possible from the cold start l position.

Simultaneously pressing the throttle trigger lockout and blipping the throttle trigger causes the master control lever to jump from the warm start n position to run F.

To switch off the engine, set the master control lever to Stop 0.

Position cold start l

– If the engine is cold

– If the engine stalls during opening of

throttle after starting

– If the fuel tank has run empty

(engine stalled out)

Position warm start n

– If engine is warm (once the engine

has been running for approx. one minute)

– When the engine has fired for the

first time

– After ventilation of the combustion

chamber, if the engine was flooded

Holding the chain saw

There are two ways to hold the chain saw during starting.

On the ground

N Place the chain saw securely on the

ground and assume a steady stance – the saw chain must not touch any objects and also must not touch the ground

N With the left hand on handlebar,

press the chain saw firmly against the ground – thumb wrapped around the handlebar

N Place your right foot into the rear

handle

Between the knees or thighs

N Clamp the rear handle between the

knees or thighs

N Grip the handlebar firmly with the

left hand – thumb wrapped around the handlebar

MS 170, MS 170 C, MS 180, MS 180 C

English

207BA022 KN

207BA025 KN

Starting

Standard versions

N With the right hand, pull the starter

grip slowly until you feel it engage – and then give it a brisk strong pull – simultaneously press down on the handlebar – do not pull the starter rope out all the way – risk of breakage! Do not let the starter grip snap back – guide it vertically back into the housing so that the starter rope can rewind properly

With a new engine or after a long period of disuse, it may be necessary to pull the starter rope several times – to prime the fuel line.

Versions with ErgoStart

The ErgoStart stores the energy for starting the chain saw. For this reason, a few seconds may pass between the pulling of the starter rope and the starting of the engine.

N With the right hand, pull the starter

grip slowly and smoothly – simultaneously press down on the handlebar – do not pull the starter rope out all the way – risk of breakage!

N Do not let the starter grip snap back

– guide it vertically back into the housing so that the starter rope can rewind properly

Starting the chain saw

WARNING

There must not be anyone within the swivel range of the chain saw.

N Observe safety precautions

For all versions

N Push the hand guard (1) forwards –

the saw chain is blocked

N Simultaneously press and hold

down the throttle trigger lockout (2) and throttle trigger – set master control lever

Position cold start l

– If engine is cold (even if the engine

has stalled during opening of throttle after starting)

Position warm start n

– If engine is warm (once the engine

has been running for approx. one minute)

N Hold and start the chain saw

MS 170, MS 170 C, MS 180, MS 180 C

English

207BA023 KN

STOP

207BA024 KN

STOP

207BA019 KN

When the engine has turned over for the first time

N Move master control lever (3) to

warm start n and continue cranking

Once the engine is running

N Pull the hand guard toward the

handlebar

The chain brake is released - the chain saw is ready for use.

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.

At very low temperatures

N Let the engine warm up briefly with

the throttle slightly open

N Move the master control lever to the

stop position 0

N Remove the spark plug - see "Spark

plug"

N Dry the spark plug N Crank the engine several times with

the starter – to clear the combustion chamber

N Replace the spark plug – see "Spark

plug"

N Set the master control lever to warm

start n – even if the engine is cold

N Restart the engine

N Press the throttle trigger lockout (2)

and blip the throttle trigger (4); the master control lever (3) jumps to run F and the engine begins to idle

NOTICE

The engine must be switched to idle immediately – otherwise, damage to the engine housing and chain brake may occur when the chain brake is locked.

MS 170, MS 170 C, MS 180, MS 180 C

Switching off the engine

N Move the master control lever to the

stop position 0

If the engine does not start

The master control lever was not returned from the position cold start l to warm start n in time, the engine may be flooded.

English

Operating Instructions

During the break-in period

A factory new machine should not be run at high revs (full throttle off load) for the first three tank fillings. This avoids unnecessarily high loads during the break-in period. As all moving parts have to bed in during the break-in period, the frictional resistances in the shortblock are greater during this period. The engine develops its maximum power after about 5 to 15 tank fillings.

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).

Check chain tension frequently

A new saw chain must be retensioned more frequently than one that has been in use already for an extended period.

Chain cold

Tension is correct when the chain fits snugly against the underside of the bar but can still be pulled along the bar by hand. Retension if necessary – see "Tensioning the Saw Chain".

Chain at operating temperature

The chain stretches and begins to sag. The drive links must not come out of the bar groove on the underside of the bar – the chain may otherwise jump off the bar. Retension the chain – see "Tensioning the Saw Chain".

NOTICE

The chain contracts as it cools down. If it is not slackened off, it can damage the crankshaft and bearings.

After a long period of full-throttle operation

After a long period of full-throttle operation, allow engine to run for a while at idle speed so that the heat in the engine can be dissipated by flow of cooling air. This protects enginemounted components (ignition, carburetor) from thermal overload.

After finishing work

N Slacken off the chain if you have

retensioned it at operating temperature during work.

NOTICE

Always slacken off the chain again after finishing work. The chain contracts as it cools down. If it is not slackened off, it can damage the crankshaft and bearings.

Short-term storage

Wait for engine to cool down. Keep the machine with a full tank of fuel in a dry place, well away from sources of ignition, until you need it again.

Long-term storage

See "Storing the machine"

MS 170, MS 170 C, MS 180, MS 180 C

English

143BA026 KN

207BA039 KN

Taking Care of the Guide Bar

N Flip the bar – after each sharpening

and each time the chain is changed – to avoid uneven wear, especially at the sprocket nose and on the bottom

N Periodically clean the oil inlet

hole (1), oil outlet channel (2) and bar groove (3)

N Measure groove depth – using the

measuring tool on the file gauge (special accessory) – in the area with the greatest wear

Picco 3/8“ P 5.0 mm Rapid 3/8“; 0.325“ 6.0 mm Rapid 0.404“ 7.0 mm

If the groove is not at least this deep: N Replace guide bar

Otherwise the drive links will grind against the base of the groove – the bottoms of the cutters and the tie straps will not lie against the bar.

Shroud

Removing the shroud

N Use a suitable tool to open the catch

by turning it 90° to the left

N Lift off the shroud

Refitting the shroud

Install parts in reverse order.

Chain type Chain pitch Minimum

groove depth Picco 1/4“ P 4.0 mm Rapid 1/4“ 4.0 mm

MS 170, MS 170 C, MS 180, MS 180 C

English

207BA037 KN

207BA029 KN

Cleaning the Air Filter

If there is a noticeable loss of engine power

N Simultaneously press the throttle

trigger lockout and throttle trigger and set the Master Control lever to cold start l

N Clean away loose dirt from around

the filter

N Remove the shroud – see "Shroud"

N Pull the filter upwards to remove N Knock out the filter or blow it clear

with compressed air from the inside outwards - do not wash

Do not clean fleece filters with a brush!

If the filter cannot be cleaned or is damaged, replace the filter

N Reinstall air filter

Adjusting the Carburetor

Basic information

The carburetor has been factoryadjusted to provide the engine with a optimal fuel-air mixture in all operating states.

Standard setting

N Check the air filter - replace if

necessary

N Check spark arresting screen –

clean or replace it if necessary

N Carefully screw the idle speed

screw (LD) down counterclockwise (left-hand thread) until it is firmly seated, then 2 turns clockwise (standard setting LD = 2)

Setting the idle speed

N Turn the idle speed adjusting

screw (LD) slowly clockwise until the saw chain begins to rotate – then back off 1/2 turn

Saw chain rotates at idle speed: N Turn the idle speed adjusting

screw (LD) slowly counterclockwise until the saw chain stops rotating – then turn an additional 1/2 turn in the same direction

WARNING

If the saw chain continues to keep rotating in idle even after adjustment, have the chain saw checked by a servicing dealer.

N Start and warm up the engine N Using the idle speed screw (LD), set

the idle speed correctly: The saw chain must not rotate

Engine speed too low when idling:

MS 170, MS 170 C, MS 180, MS 180 C

English

143BA029 KN

207BA036 KN

000BA039 KN

000BA045 KN

Spark Arresting Screen in Muffler

In some countries the muffler is equipped with a spark arresting screen.

N If the engine is down on power,

check the spark arresting screen in the muffler.

N Wait for the muffler to cool down.

Spark Plug

N If the engine is down on power,

difficult to start or runs poorly at idle speed, first check the spark plug.

N 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 "Specifications".

Removing the spark plug

N Simultaneously press the throttle

trigger lockout and throttle trigger and set the Master Control lever to cold start l

N Remove the shroud – see "Shroud"

Checking the Spark Plug

N Clean dirty spark plug. N Check electrode gap (A) and

readjust if necessary – see "Specifications".

N Rectify the problems which have

caused fouling of the spark plug.

Possible causes are:

– Too much oil in fuel mix.

– Dirty air filter.

– Unfavorable running conditions.

N Take out the screws (1) and remove

the cover (2).

N Remove the spark arresting screen

(3) from the muffler (4).

N Clean the spark arresting screen. If

N Refit the spark arresting screen –

the screen is damaged or heavily carbonized, fit a new one.

place the cover in position and secure it with the screws.

MS 170, MS 170 C, MS 180, MS 180 C

N Pull off the spark plug boot N Unscrew spark plug

WARNING

Arcing may occur if the adapter nut (1) is loose or missing. Working in an easily combustible or explosive atmosphere may cause a fire or an explosion. This can result result in serious injuries or damage to property.

English

143BA042 KN

N Use resistor type spark plugs with a

properly tightened adapter nut.

Installing the spark plug

N Install the spark plug and connect

the spark plug boot (press it down firmly) – reassembly all other parts in the reverse sequence.

Storing the Machine Checking and Replacing the

Chain Sprocket

For periods of 3 months or longer N Drain and clean the fuel tank in a

well ventilated area.

N Dispose of fuel properly in

accordance with local environmental requirements.

N Run the engine until the carburetor

is dry – this helps prevent the carburetor diaphragms sticking together.

N Remove the saw chain and guide

bar, clean them and spray with corrosion inhibiting oil.

N Thoroughly clean the machine – pay

special attention to the cylinder fins and air filter.

N If you use a biological chain and bar

lubricant, e.g. STIHL BioPlus, completely fill the chain oil tank.

N Store the machine in a dry, high or

locked location, out of the reach of children and other unauthorized persons.

N Remove chain sprocket cover, saw

chain and guide bar.

N Release chain brake – pull hand

guard against the front handle

Fit new chain sprocket

– after use of two saw chains or

earlier

– if the wear marks (arrows) are

deeper than 0.5 mm – otherwise the service life of the saw chain is reduced – use check gauge (special accessory) to test

Using two saw chains in alternation helps preserve the chain sprocket

STIHL recommends use of original STIHL chain sprockets in order to ensure optimal functioning of the chain brake.

MS 170, MS 170 C, MS 180, MS 180 C

English

001BA086 KN

689BA027 KN

N Use a screwdriver to remove the E-

clip

N Remove washer N Remove the chain sprocket

together with the needle cage from the crankshaft

Install chain sprocket

N Clean crankshaft stub and needle

cage and lubricate with STIHL lubricant (special accessory)

N Slide needle cage onto the

crankshaft stub

N After refitting, turn the chain

sprocket approx. 1 full turn so that the carrier for the oil pump drive engages

N Refit washer and E-clip on the

crankshaft

Maintaining and Sharpening the Saw Chain

Sawing effortlessly with a properly sharpened saw chain

A properly sharpened saw chain cuts through wood effortlessly even with very little pushing.

Never use a dull or damaged saw chain – this leads to increased physical strain, increased vibration load, unsatisfactory cutting results and increased wear.

N Clean the saw chain N Check the saw chain for cracks and

damaged rivets

N 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 listed below is absolutely necessary. An improperly sharpened saw chain – especially depth gauges that are too low – can lead to increased kickback tendency of the chain saw – risk of injury!

Chain pitch

The chain pitch marking (a) is embossed in the area of the depth gauge of each cutter.

Marking (a) Chain pitch

Inches mm 7 1/4 P 6.35 1 or 1/4 1/4 6.35 6, P or PM 3/8 P 9.32 2 or 325 0.325 8.25 3 or 3/8 3/8 9.32 4 or 404 0.404 10.26

The diameter of file to be used depends on the chain pitch – see table "Sharpening tools".

The angles of the cutter must be maintained during resharpening.

MS 170, MS 170 C, MS 180, MS 180 C

English

689BA021 KN

689BA025 KN

001BA203 KN

689BA018 KN

90°

689BA043 KN

Sharpening and side plate angles

A Sharpening angle

STIHL saw chains are sharpened with a 30° sharpening angle. Ripping chains, which are sharpened with a 10° sharpening angle, are exceptions. Ripping chains have an X in the designation.

B Side plate angle

The correct side plate angle results automatically when the specified file holder and file diameter are used.

Tooth shapes Angle (°)

Micro = semi-chisel tooth,

30 75 e. g., 63 PM3, 26 RM3, 36 RM

Super = full chisel tooth,

30 60 e. g., 63 PS3, 26 RS, 36 RS3

Ripping chain, e. g.,

10 75 63 PMX, 36 RMX

The angles must be identical for all cutters in the saw chain. Varying angles: Rough, uneven running of the saw chain, increased wear – even to the point of saw chain breakage.

File holder

N Use a file holder

Always use a file holder (special accessory, see table "Sharpening tools") when sharpening saw chains by hand. File holders have markings for the sharpening angle.

Use only special saw chain files! Other files are unsuitable in terms of shape and type of cutting.

To check the angles

STIHL filing gauge (special accessory, see table "Sharpening tools") – a universal tool for checking sharpening and side plate angles, depth gauge setting, and tooth length, as well as cleaning grooves and oil inlet holes.

Proper sharpening

N Select sharpening tools in

accordance with chain pitch

N Clamp guide bar if necessary N Block saw chain – push the hand

guard forward

N 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 throttle trigger lockout

N Sharpen frequently, removing little

material – two or three strokes of the file are usually sufficient for simple resharpening

N Guide the file: horizontally (at a r ight

angle to the side surface of the guide bar) in accordance with the specified angle – according to the

MS 170, MS 170 C, MS 180, MS 180 C

English

689BA023 KN

689BA061 KN

689BA051 KN

689BA044 KN

markings on the file holder – rest the file holder on the tooth head and the depth gauge

N File only from the inside outward N The file only sharpens on the

forward stroke – lift the file on the backstroke

N Do not file tie straps and drive links N Rotate the file a little periodically in

order to avoid uneven wear

N To remove file burr, use a piece of

hardwood

N Check angle with file gauge

All cutters must be equally long.

With varying cutter lengths, the cutter heights also vary and cause rough running of the saw chain and chain breakage.

N All cutters must be filed down equal

to the length of the shortest cutter – ideally, one should have this done by a servicing dealer using an electric sharpener

a Required distance between depth

gauge and cutting edge

When cutting softwood outside of the frost season, the distance can be increased by up to 0.2 mm (0.008").

Chain pitch Depth gauge

Distance (a) Inches (mm) mm (Inches) 1/4 P (6.35) 0.45 (0.018) 1/4 (6.35) 0.65 (0.026) 3/8 P (9.32) 0.65 (0.026)

0.325 (8.25) 0.65 (0.026) 3/8 (9.32) 0.65 (0.026)

0.404 (10.26) 0.80 (0.031)

Lowering the depth gauges

The depth gauge setting is lowered when the cutter is sharpened.

N Check the depth gauge setting after

each sharpening

Saw chains with humped drive link (2) – upper part of the humped drive link (2) (with service mark) is lowered at the same time as the depth gauge of the cutter.

WARNING

The rest of the humped drive link must not be filed; otherwise, this could increase the tendency of the chain saw to kick back.

N Rework the depth gauge so that it is

flush with the file gauge

Depth gauge setting

The depth gauge determines the depth to which the cutter penetrates the wood and thus the chip thickness.

MS 170, MS 170 C, MS 180, MS 180 C

N 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 protrudes past the file gauge, the depth gauge must be reworked

N Afterwards, dress the leading edge

of the depth gauge parallel to the service mark (see arrow) – when doing this, be careful not to further lower the highest point of the depth gauge

English

689BA052 KN

WARNING

Depth gauges that are too low increase the kickback tendency of the chain saw.

chain thoroughly, removing any filings or grinding dust – lubricate the saw chain thoroughly

N In the event of extended periods of

disuse, store saw chains in cleaned and oiled condition

N Lay the file gauge on the saw chain

– the highest point of the depth gauge must be flush with the file gauge

Sharpening tools (special accessories) Chain pitch Round file ^ Round file File holder File gauge Taper square file Sharpening set Inches (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 4006 5605 750 4327 1110 893 4000 0814 252 3356 5605 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 0814 252 3356 5605 007 1028 3/8 (9.32) 5.2 (13/64) 5605 772 5206 5605 750 4329 1110 893 4000 0814 252 3356 5605 007 1029

0.404 (10.26) 5.5 (7/32) 5605 772 5506 5605 750 4330 1106 893 4000 0814 252 3356 5605 007 1030

consisting of file holder with round file, taper square file and file gauge

N After sharpening, clean the saw

MS 170, MS 170 C, MS 180, MS 180 C

Maintenance and Care

The following maintenance intervals apply for normal operating conditions only. When working under difficult conditions (high accumulation of dust, highly resinous lumber, lumber from tropical trees, etc.) or longer than normal each day, the specified intervals must be shortened accordingly. If you only use the tool occasionally, extend the intervals accordingly.

Before starting work

At the end of work and/or

daily

Whenever tank is refilled

Weekly

Complete machine

Throttle trigger, throttle trigger lockout, choke lever, stop switch, master control lever (dependent on equipment)

Chain brake

Manual fuel pump (if present)

Fuel pick-up body / filter in fuel tank

Fuel tank Clean X

Lubricating oil tank Clean X

Chain lubrication check X

Saw chain

Guide bar

Chain sprocket check X

Air filter

Visual inspection (condition, leaks) XX

Clean X

Function test XX

Have checked by dealer

check X

Have repaired by a specialist dealer

check X

Clean, replace filter insert XX

replace XXX

Check, pay attention to sharpness XX

Checking the chain tension XX

sharpen X

Check (wear, damage) X

Clean and turn over X

Deburr X

replace XX

Clean XX

replace X

Monthly

English

Annually

If faulty

If damaged

As required

MS 170, MS 170 C, MS 180, MS 180 C

English

Before starting work

At the end of work and/or

daily

Whenever tank is refilled

Weekly

Monthly

Annually

If faulty

If damaged

As required

Anti-vibration elements

Air intake on fan housing Clean XX X

Cylinder fins Clean XX

Carburetor

Spark plug

Accessible screws and nuts (except adjusting screws)

Spark arresting screen in muffler

Chain catcher

Safety information label replace X

STIHL recommends STIHL servicing dealer

When using professional chainsaws (with a power output of 3.4 kW or more) for the first time, tighten the cylinder block screws after 10 to 20 hours of operation

check XX

Have replaced by servicing dealer

Check idle adjustment – saw chain must not rotate

Set the idle speed; if required have the chainsaw repaired by a specialist dealer

Adjust electrode gap X

Replace after 100 hours of operation

Tighten

Have checked by dealer

Have cleaned; if required have replaced by specialist dealer

check X

replace X

MS 170, MS 170 C, MS 180, MS 180 C

Main Parts

207BA031 KN

English

1 Shroud catch 2 Carburetor adjusting screw 3 Chain brake 4 Muffler with spark arresting screen 5 Chain sprocket 6 Chain sprocket cover 7 Chain catcher 8 Chain tensioner (frontal) 9 Guide bar 10 Oilomatic saw chain 11 Adjusting wheel (quick tensioner) 12 Handle 13 Oil filler cap 14 Bumper spike 15 Front hand guard 16 Front handle (handlebar) 17 Spark plug boot 18 Starter grip 19 Master control lever 20 Fuel filler cap 21 Throttle trigger 22 Throttle lever lock 23 Rear handle 24 Rear hand guard # Machine number

MS 170, MS 170 C, MS 180, MS 180 C

English

Specifications

Engine

STIHL single cylinder two-stroke engine

MS 170, MS 170 C

Displacement: 30.1 cm Cylinder bore: 37 mm Piston stroke: 28 mm Engine power

according to ISO 7293:

Idle speed:

1.3 kW (1.8 HP) at 8500 rpm

2800 rpm

MS 180, MS 180 C

Displacement: 31.8 cm Cylinder bore: 38 mm Piston stroke: 28 mm Engine power

according to ISO 7293:

Idle speed:

to ISO 11681 +/- 50 rpm

1.5 kW (2.0 HP) at 9000 rpm

2800 rpm

Ignition system

Electronic magneto ignition

Spark plug (suppressed):

Bosch WSR 6 F, NGK BPMR 7 A

Electrode gap: 0.5 mm

Fuel system

All position diaphragm carburetor with integral fuel pump

Fuel tank capacity: 250 cm

(0.25 l)

Chain lubrication

Fully automatic, speed-controlled oil pump with rotary piston

Oil tank capacity: 145 cm

(0.145 l)

Weight

Dry, without cutting attachment MS 170: 3.9 kg MS 170 C with ErgoStart: 4.2 kg MS 180: 3.9 kg MS 180 C with quick tensioner

and ErgoStart: 4.2 kg

Bar and chain MS 170, MS 170 C

Actual cutting length may be less than the specified length

Rollomatic guide bars

Cutting lengths (3/8"P pitch): 30, 35, 40 cm

Groove width: 1.1 mm

Saw chain 3/8" Picco

Picco Micro Mini 3 (61 PMM3) Type 3610

Pitch: 3/8"P (9.32 mm) Drive link gauge: 1.1 mm

Chain sprockets

6-tooth for 3/8" P Max. chain speed to

ISO 11681: 21.1 m/s Chain speed at maximum

power output: 18.6 m/s

Bar and chain MS 180, MS 180 C

Actual cutting length may be less than the specified length

Rollomatic guide bars

Cutting lengths (3/8"P pitch): 30, 35, 40 cm

Groove width: 1.1 mm Groove width: 1.3 mm

Saw chains 3/8"Picco

Picco Micro Mini 3 (61 PMM3) Type 3610

Pitch: 3/8"P (9.32 mm) Drive link gauge: 1.1 mm

Picco Micro 3 (63 PM3) Type 3636 Picco Duro (63 PD3) Type 3612 Pitch: 3/8"P (9.32 mm) Drive link gauge: 1.3 mm

Chain sprocket

6-tooth for 3/8" P Max. chain speed to

ISO 11681: 22.3 m/s Chain speed at maximum

power output: 21.7 m/s

MS 170, MS 170 C, MS 180, MS 180 C

English

Sound and vibration levels

For further details concerning compliance with the Physical Agents Directive Vibration 2002/44/EC, see www.stihl.com/vib

Sound pressure level L

to ISO 22868

peq

MS 170: 98 dB(A) MS 170 C: 98 dB(A) MS 180: 98 dB(A) MS 180 C: 98 dB(A)

Sound power level L

to ISO 22868

MS 170: 109 dB(A) MS 170 C: 109 dB(A) MS 180: 110 dB(A) MS 180 C: 110 dB(A)

Vibration level a

to ISO 22867

hv,eq

Handle,

Handle, left MS 170: 4.2 m/s MS 170 C: 4.2 m/s MS 180: 6.6 m/s MS 180 C: 7.6 m/s

right

5.9 m/s

7.8 m/s

7.4 m/s

The K-factor in accordance with Directive 2006/42/EC is 2.0 dB(A) for the sound pressure level and sound power level; the K-factor in accordance with Directive 2006/42/EC is 2.0 m/s2 for the vibration level.

REACH

REACH is an EC regulation and stands for the Registration, Evaluation, Authorisation and Restriction of Chemical substances.

For information on compliance with the REACH regulation (EC) No. 1907/2006 see www.stihl.com/reach.

Exhaust Emissions

The CO2value measured in the EU type approval procedure is specified at www.stihl.com/co2.

The measured CO

value was

determined on a representative engine in accordance with a standardized test procedure under laboratory conditions and does not represent either an explicit or implied guarantee of the performance of a specific engine.

The applicable exhaust emission requirements are fulfilled by the intended usage and maintenance described in this instruction manual. The type approval expires if the engine is modified in any way.

Ordering Spare Parts

Please enter your saw model, serial number as well as the part numbers of the guide bar and saw chain in the spaces provided. This will make reordering simpler.

The guide bar and saw chain are subject to normal 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

MS 170, MS 170 C, MS 180, MS 180 C

English

000BA073 KN

Maintenance and Repairs Disposal

Users of this machine may only carry out the maintenance and service work described in this user manual. All other repairs must be carried out by a servicing dealer.

STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information.

When repairing the machine, only use replacement parts which have been approved by STIHL for this power tool or are technically identical. Only use highquality replacement parts in order to avoid the risk of accidents and damage to the machine.

STIHL recommends the use of original STIHL replacement parts.

Original STIHL parts can be identified by the STIHL part number, the { logo and the STIHL parts symbol K (the symbol may appear alone on small parts).

Observe all country-specific waste disposal rules and regulations.

STIHL products must not be thrown in the garbage can. Take the product, accessories and packaging to an approved disposal site for environmentfriendly recycling.

Contact your STIHL servicing dealer for the latest information on waste disposal.

EC Declaration of Conformity

ANDREAS STIHL AG & Co. KG Badstr. 115 D-71336 Waiblingen

Germany

declares under our sole responsibility that

Designation: Chainsaw Make: STIHL Series: MS 170

MS 180 MS 180 C

Serial identification number:

Displacement all MS 170: 30.1 cm all MS 180: 31.8 cm

conforms to the relevant provisions of Directives 2011/65/EU, 2006/42/EC, 2014/30/EU and 2000/14/EC and has been developed and manufactured in compliance with the following standards in the versions valid on the date of production:

EN ISO 11681-1, EN 55012, EN 61000-6-1

The measured and the guaranteed sound power level have been determined in accordance with Directive 2000/14/EC, Annex V, and standard ISO 9207.

Measured sound power level

1130

all MS 170: 109 dB(A) all MS 180: 110 dB(A)

MS 170, MS 170 C, MS 180, MS 180 C

Guaranteed sound power level

all MS 170: 111 dB(A) all MS 180: 112 dB(A)

The EC type examination was carried out by

DPLF Deutsche Prüf- und Zertifizierungsstelle für Land- und Forsttechnik GbR (NB 0363) Spremberger Straße 1 D-64823 Groß-Umstadt

Certification No. all MS 170: K-EG -

2009/3408

all MS 180: K-EG -

2009/3409

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

English

Dr. Jürgen Hoffmann

Head of Product Data, Regulations and Licensing

MS 170, MS 170 C, MS 180, MS 180 C

0458-207-8321-B

AUS

www.stihl.com

*04582078321B*

0458-207-8321-B

Stihl MS 170, MS 180 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual