Stihl MS 18, MS 170 Servise Manual

Setup and Service Procedures for the

1

MS 170, MS 180 Chain Saw

Introduction

confidential

 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

Specifications

2

MS 170 MS 180

confidential

 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)

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

confidential

Cold Start

Starting Features

3

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

confidential

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

confidential

housing and the handle extends out slightly farther for clearance

4

confidential

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

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

confidential

Install the Bar and Chain

5

 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

confidential

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

confidential

Install Bar & Chain

6

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

the powerhead!

WRONG

CORRECT

confidential

Quick Chain Adjuster (QCA)

 The QCA allows the user to adjust the

chain tension without tools

Loosen the wing nut

Rotate the

adjusting wheel

confidential

Tighten the wing nut

Install Bar & Chain

7

confidential

 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

Install Bar & Chain

confidential

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

the cover

Chain Adjustment

8

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

confidential

Correct Chain Tension

9

 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

confidential

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

confidential

when the bottom of the drive link will just clear the bar groove

Cutterless Chain for Service

10

 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

Chain Brake

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

Disengaged

Starting the 1130 Saw

11

 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

confidential

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

confidential

Lever™ in the full choke position, down to the #1 position

Instruction Manual Directions for Safely

12

Starting a Chain Saw

(Never Drop Start a Chain Saw!)

confidential

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

confidential

First Time Start-Up

13

 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

confidential

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

confidential

 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

Bar & Chain Oiler Check

14

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

confidential

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

confidential

 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

Stihl MS 18, MS 170 Servise Manual

Specifications and Main Features

Frequently Asked Questions

User Manual