Stihl MS 18 Istruzioni per la costruzione

Setup and Service Procedures for the

MS 170, MS 180 Chain Saw

confidential

Introduction

The MS 170, MS 180 chain saw has a 2-cycle engine

STIHL assigns a 4 digit series number to every product

The MS 170, MS 180 is assigned the 1130 series number

The 1130 series of saw was introduced to the market in

1995 as an 017, and then in 1998 the 018 was added

In 2002 the model designation changed from 017 to MS

170, and 018 to MS 180

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Specifications

Engine Displacement 30.1 cc (1.8 cu.in) 31.8 cc(1.9 cu. in.)

Engine Power 1.3 kW (1.7bhp) 1.5kW (2.0 bhp)

Weight 3.9 kg (8.6 lbs) 4.0 kg (8.8 lbs.)

Fuel Capacity 250 cc (8.5 oz.)

Chain Oil Capacity 145 cc (4.9 oz.)

Recommended OILOMATIC® Chain 3/8” PMM3

Guide Bar Lengths Available 12” to 16”

Engine Idle Speed 2800 RPM

Wide Open Throttle 14,000 RPM (with bar and chain installed)

MS 170 MS 180

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Become Familiar With the Controls

Master Control Lever™

A single lever

operating the choke,

throttle lock and on-off

switch

0 = Off

I = Ignition on

Warm Start

Cold Start

confidential

Starting Features

The MS 170 is equipped with a

standard starter mechanism,

and with 2 bar nuts holding the

bar in place

The MS 180 C-B has the

Toolless Quick Chain Adjuster

(QCA) for fast and easy chain

and bar install and adjustment

The MS 180 C-BE also has the

Easy2Start™ starter

mechanism which allows

starting with less effort at a

lower cranking speed

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Starting Features

The MS 180 C-B has the standard starter mechanism, which

requires a brisk pull on the rope to it’s full extension to start

the engine

The MS 180 C-BE has the Easy2Start™ starter mechanism,

which allows starting by simply pulling out the rope slow and

easy, winding the auxiliary spring which then spins the motor

over to start it

Notice that the MS

180 C-BE has a

deeper recoil

housing and the

handle extends out

slightly farther for

clearance

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Kickback!!!

Kickback occurs when the

moving saw chain near

the upper quadrant of the

bar nose contacts a solid

object or is pinched

The greater the force of

the kickback reaction, the

more difficult it becomes

for the operator to control

the saw

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Chain and Bar Color Code Marking

STIHL saw chain will have a green

or yellow tie strap to indicate if the

chain is low-kickback or other than

low-kickback

The bar will have two green or

yellow dots on the powerhead end

of the bar to identify if the bar is a

reduced kickback bar or not

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Install the Bar and Chain

STIHL recommends the use of reduced

kickback bars and low kickback chains on

all STIHL chain saws

Yellow bar and chain combinations are for

trained professionals with extraordinary

cutting needs

Be sure the bar and chain are within the

recommended length for the model of

saw being assembled

Always wear gloves when handling saw

chain to protect your hands from the

sharp cutters

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Install Bar & Chain: Quick Chain Adjuster

Install the tensioning gear and fasten the screw securely

The bar can be installed with the STIHL logo facing up or

down; periodically the bar should be flipped to spread the

wear over both edges of the bar

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Install Bar & Chain

Make sure the cutters on top of the bar are facing away from

the powerhead!

WRONG

CORRECT

WRONG

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Quick Chain Adjuster (QCA)

The QCA allows the user to adjust the

chain tension without tools

Loosen the wing nut Rotate the

adjusting wheel Tighten the wing nut

confidential

Install Bar & Chain

If the saw does not have a QCA simply remove the 2 bar nuts,

install the bar and chain, making sure the adjusting pin is in the

hole in the bar

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Install Bar & Chain

Install the cover and the 2 nuts leaving them just snug against

the cover

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Chain Adjustment

The 1130 saws have a front

chain tensioner

Most STIHL chain saws have a

side chain tensioner that is more

convenient to use

Saws come with a combination

wrench, commonly referred to as

a “Scrench”, to make bar and

chain service easy to do

confidential

Install Bar & Chain

Adjust the chain tension with the “Scrench” by holding up on

the nose of the bar, tightening the chain tension screw, then

tightening the nuts

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Correct Chain Tension

With the chain brake

disengaged, pull the

chain through from the

top side and it should

rotate freely without any

slack appearing

If the chain goes from

tight to loose the

sprocket and chain may

not be of the same pitch,

or the sprocket and chain

may have excessive

wear and no longer have

the same pitch

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Correct Chain Tension

Regardless of bar

length, check for

correct chain tension

by pulling up on the

chain at the center of

the bar

The tension is correct

when the bottom of the

drive link will just clear

the bar groove

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Cutterless Chain for Service

For any chain saw, to properly tune the carb or verify running

RPM at idle and wide open throttle a bar and chain should be

installed

Cutterless chains are available to provide a safe way for the

service technician to do this without fear of the chain coming

into contact with anything

confidential

All Current Models of STIHL Chain Saws are Equipped with

the STIHL Quickstop® Chain Braking System

The chain is stopped and locked when the hand guard is

pushed toward the guide bar nose by the left hand – or when

the brake is activated by enough inertia in certain kickback

situations Brake

Band

Engaged

Brake

Band

Disengaged

Chain Brake

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