Stihl Ms 18 Building instructions

Setup and Service Procedures for the

MS 170, MS 180 Chain Saw

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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

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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

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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

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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

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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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Starting the 1130 Saw

Fill the tank with 89

octane brand name fuel

with STIHL two-stroke oil

mixed at a 50:1 ratio, or

use STIHL MotoMix

Add bar oil to the oil tank

for chain lubrication

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Starting the 1130 Saw

Push down on the interlock

on the top of the handle and

then squeeze the throttle all

the way open and hold it

Place the Master Control

Lever™ in the full choke

position, down to the #1

position

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Instruction Manual Directions for Safely

Starting a Chain Saw

(Never Drop Start a Chain Saw!)

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First Time Start-Up

When the engine starts, commonly referred

to as a “false start”, move the Master

Control Lever™ up to #2, to open the

choke and then pull the rope again

The engine should start and run at fast idle

Quickly “blip” the throttle to release the

engine from the fast idle position

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First Time Start-Up

If a saw is left in the fast idle position with the chain brake

engaged for even a very short period of time it may overheat

the clutch and chain brake components and possibly ruin the

tank housing as well

To stop the engine raise the Master Control Lever™ to the 0

(off) position, #4 in the picture

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First Time Start-Up: Warm Up

After the engine has started and the chain brake has been

released, slowly squeeze the throttle about half way open and

then slowly release it back to idle

Do this several times, for at least 20 seconds, to completely

purge any remaining air from the carburetor circuits and to

allow the chain lubrication pump time to prime the system with

bar and chain oil

Never allow any chain saw engine to run at full throttle without

a load, regardless if it is new or broken-in, for more than a few

seconds

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Bar & Chain Oiler Check

Carefully hold the

tip of the bar over a

piece of wood or

cardboard

Run the saw at half

throttle and verify

that a line of bar

and chain lubricant

is being slung off

the end of the bar

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Factory Testing of All STIHL Products

Every engine manufactured by STIHL has been started and

operated in a test cell

The test cell makes carburetor adjustments and verifies

that the engine runs properly at idle, acceleration, and at

full throttle under load

The test cell measures the running performance and

emissions and verifies that they are within acceptable

parameters

All the dealer needs to do is service the unit and verify it is

ready for the customer to operate it

It is extremely rare that a new unit will need any major

adjustments or repair

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Fault Analysis: STIHL Engine Check

When a unit is running poorly or not at all, using a systematic

approach to identify any and all faults present will allow the

Service Technician to quickly and efficiently determine what is

wrong

It is just as

important to

know what

faults are not

present as well

as faults that

do need to be

addressed

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DG Screws

It is imperative that the Service Technician keep track of which

screw is which and not screw them into the wrong base

material or the threads will be damaged

It is also best practice that when starting a DG screw into the

hole, slowly rotate it backwards until it “clicks” to index the

threads, then turn it clockwise to tighten it

For Plastic For Metal

STIHL uses the DG type of

fastener in manufacturing because

they cut their own threads the first

time they are used

Notice that the ones holding into

plastic have a different pitch and

profile than the ones that hold into

metal

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1. Deflectors, Shrouds, Covers, Fasteners

Visually look the unit over for damage, missing items, loose

fasteners, or anything else that is obvious

Damaged shroud may be a

safety hazard for the operator

Operated without

an air filter or cover

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2. Warning Labels

Verify that warning labels

are present and readable

On a chain saw the only

label the service technician

should be concerned with

is the one on the chain

brake handle

If this label is damaged or

worn away, a universal

replacement label is

available from STIHL

White Chain Saw Label:

0000 967 3613

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3. Cutting Attachment

Note type and condition

Inspect for wear or damage

Bar, chain, and sprocket

within wear limits

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3. Cutting Attachment 4. Belt Tension

If the unit is a trimmer or a concrete saw:

Tap head eyelets worn, spool worn, retainer secure

Belt tension correct; belt worn or frayed

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5. Operator Controls

The interlock should

be sticking up out of

the handle, and it

must be depressed

flush with the handle

before the throttle

trigger will move

Be sure the throttle

moves freely

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5. Operator Controls

The throttle must be squeezed all the way open before the

Master Control Lever™ can be actuated to the full choke

position, then release the throttle and the Master Control

Lever™ should stay in the choke position

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5. Operator Controls

Now raise the Master

Control Lever™ up one

notch with your thumb, and

it should stay in the warm

start, half choke position

Now squeeze the trigger

and it should snap up to the

Iposition automatically

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5. Operator Controls

Finally the Master

Control Lever™

should easily slide up

to the O position

Any problem with the

Master Control

Lever™ should be

noted for repair

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5. Operator Controls

When the chain

brake handle is

actuated back

and forth, there

should be an

audible “click”

In the forward

position the

sprocket must

not turn

In the back

position the

sprocket must

spin easily

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6. Verify Anti-vibration Components

Most STIHL chain saws and line

trimmers have an anti-vibration

system that should be inspected for

wear and damage

Some models do not have any anti-

vibration components so this step

would not apply

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