Instruction Manual

ManualsBrandsSTIHL ManualsChainsawsSTIHL MS 391

Table Of Contents

STIHL MS 311, 391
1 Guide to Using this Manual
- 1.1 Pictograms
- 1.2 Symbols in text
- 1.3 Engineering improvements
2 Safety Precautions
- 2.1 General
- 2.2 Intended use
- 2.3 Clothing and Equipment
- 2.4 Transporting
- 2.5 Cleaning
- 2.6 Accessories
- 2.7 Refuelling
- 2.8 Before Starting Work
- 2.9 Starting the chain saw
- 2.10 During operation
- 2.11 After finishing work
- 2.12 Storage
- 2.13 Vibrations
- 2.14 Maintenance and repairs
3 Reactive Forces
- 3.1 Dangers of kickback
- 3.2 Kickback occurs if, e. g.,
- 3.3 Quickstop chain brake:
- 3.4 To reduce the risk of kickback
- 3.5 Pull-in (A)
- 3.6 Pushback (B)
- 3.7 Exercise extreme caution
4 Working Techniques
- 4.1 Sawing
- 4.2 Preparing for felling
- 4.3 Felling notch
- 4.4 Sapwood cuts
- 4.5 Basic information on felling cut
- 4.6 Selecting the appropriate felling cut
- 4.7 Felling cut with stabilizing strap (normal tree)
- 4.8 Felling Cut with Holding Strap (Leaner)
5 Cutting Attachment
- 5.1 Chain Scabbard
- 5.2 Fitting Chain Scabbard Extension
6 Mounting the Bar and Chain
- 6.1 Removing the chain sprocket cover
- 6.2 Disengaging the chain brake.
- 6.3 Fitting the chain
7 Tensioning the Chain
8 Checking Chain Tension
9 Fuel
- 9.1 STIHL MotoMix
- 9.2 Mixing Fuel
- 9.3 Storing Fuel
10 Fueling
- 10.1 Preparing the machine
- 10.2 Opening
- 10.3 Filling Up with Fuel
- 10.4 Closing
- 10.5 If the tank cap cannot be locked in the fuel tank opening
11 Chain Lubricant
12 Filling Chain Oil Tank
- 12.1 Preparations
- 12.2 Fill up with chain oil.
13 Checking Chain Lubrication
14 Chain Brake
- 14.1 Saw chain, lock
- 14.2 Disengage the chain brake.
- 14.3 Checking Operation of the Chain Brake
- 14.4 Chain Brake Maintenance
15 Winter Operation
- 15.1 Remove shroud
- 15.2 Pre-heat carburetor
- 15.3 At temperatures below -10 °C
- 15.4 Cover plate
16 Starting / Stopping the Engine
- 16.1 Positions of the Master Control lever
- 16.2 Adjust Master Control lever
- 16.3 Holding the Chain Saw
- 16.4 Actuating
- 16.5 Starting the Chainsaw
- 16.6 When Engine Begins to Fire
- 16.7 As Soon As the Engine Runs
- 16.8 At Very Low Outside Temperatures
- 16.9 Shut off the engine
- 16.10 If Engine Does Not Start
17 Operating Instructions
- 17.1 During the break-in period
- 17.2 During work
- 17.3 After finishing work
18 Oil Quantity Control
19 Taking Care of the Guide Bar
20 Cleaning the Air Filter
- 20.1 If there is a noticeable loss of engine power
21 Adjusting the Carburetor
- 21.1 General Information
- 21.2 Preparations
- 21.3 Different Standard Settings
- 21.4 Standard Setting A
- 21.5 Standard Setting B
- 21.6 Adjusting Idle Speed
- 21.7 Fine Tuning for Operation at High Altitude
22 Spark Arresting Screen in Muffler
23 Spark Plug
- 23.1 Remove the spark plug
- 23.2 Checking the Spark Plug
- 23.3 Install spark plug
24 Storing the Machine
25 Checking and Replacing the Chain Sprocket
- 25.1 Fit new chain sprocket
- 25.2 Install spur chain sprocket / rim sprocket
26 Maintaining and Sharpening the Saw Chain
- 26.1 Sawing effortlessly with a properly sharpened saw chain
- 26.2 Chain pitch
- 26.3 Sharpening and side plate angles
- 26.4 File holder
- 26.5 To check the angles
- 26.6 Proper sharpening
- 26.7 Depth gauge setting
- 26.8 Lowering the depth gauges
27 Maintenance and Care
28 Main Parts
29 Specifications
- 29.1 Engine
- 29.2 Ignition System
- 29.3 Fuel System
- 29.4 Chain Lubrication
- 29.5 Weight
- 29.6 Cutting Attachment
- 29.7 Noise and Vibration Data
- 29.8 REACH
- 29.9 Exhaust Emissions
30 Ordering Spare Parts
31 Maintenance and Repairs
32 Disposal
33 EC Declaration of Conformity

► Lay the appropriate file gauge (1) for the chain

pitch on the saw chain and press it against the

cutter to be checked – if the depth gauge pro‐

trudes past the file gauge, the depth gauge

must be reworked

Saw chains with humped drive link (2) – upper

part 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.

689BA051 KN

► Rework the depth gauge so that it is flush with

the file gauge

689BA044 KN

► Afterwards, dress the leading edge of the

depth gauge parallel to the service mark (see

arrow) – when doing this, be careful not to fur‐

ther lower the highest point of the depth gauge

WARNING

Depth gauges that are too low increase the kick‐

back tendency of the chain saw.

689BA052 KN

► Lay the file gauge on the saw chain – the high‐

est point of the depth gauge must be flush with

the file gauge

► After sharpening, clean the saw chain thor‐

oughly, removing any filings or grinding dust –

lubricate the saw chain thoroughly

► In the event of extended periods of disuse,

store saw chains in cleaned and oiled condi‐

tion

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 40065605 750 43271110 893 40000814 252 33565605 007

1027

3/8 P (9.32) 4.0 (5/32) 5605 772

4006

5605 750

4327

1110 893

4000

0814 252

3356

5605 007

1027

English 26 Maintaining and Sharpening the Saw Chain

34 0458-542-8321-D