Table of Contents
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021, 023, 025
CONTENTS
1.
Safety Precautions
2.
3.
3.1
3.2
3.3
3.4
Cutting Attachment
3.5
Special Accessories
3.5.1
3.5.2
3.6
4.
Clutch, Chain Drive,
Chain Brake and
Chain Tensioner
4.1
4.2
4.3
4.4
4.4.1
Checking Function
4.4.2
4.4.3
Assembly
4.5
Front Chain Tensioner 12
4.6
Side Chain Tensioner 12
5.
Engine
5.1
Exhaust Muffler/Spark
Arresting Screen
5.2
Leaking Test
5.2.1
Preparations
5.2.2
Pressure Test
5.2.3
Vacuum Test
5.3
Oil Seals
5.4
Removing and
Installing
5.5
Cylinder
5.6
Piston
5.7
Piston Rings
5.8
Crankshaft
5.9
Connecting Rod
(021 up to Serial No.
X 34 944 402)
5.10
Decompression Valve 24
6.
Ignition System
6.1
Spark Plug Boot
6.2
Ignition Lead
6.3
Ignition Module
6.3.1
Ignition Timing
6.3.2
Removing and
Installing
6.4
Flywheel
021, 023, 025
1
7.
Rewind Starter
7.1
Routine Maintenance
2
7.2
Rewind Spring
7.2.1
Replacing
3
7.2.2
Tensioning
3
3
8.
AV Handle System/
4
4
8.1
Annular Buffers
4
8.2
Front Handle
4
8.3
Handle Housing
4
8.4
Switch Shaft
5
8.5
Contact Spring
8.6
Throttle Trigger/
Interlock Lever
6
9.
Chain Lubrication
9.1
Pickup Body
6
9.2
Connector/
7
Suction Hose
7
9.3
Vent Valve
8
9.4
Worm
8
9.5
Oil Pump
8
10
10.
Fuel System
10.1
Air Filter
10.2
Carburetor
13
10.2.1 Leakage Test
10.2.2 Removing and
Installing
13
10.2.3 Adjustment (except
14
023 L and USA)
14
10.2.4 Adjustment
15
(023 L and USA)
15
10.3
Tank Vent
16
10.4
Pickup Body
10.5
Suction Hose
18
10.6
Manual Fuel Pump
18
10.6.1 Fuel Hoses
20
10.7
Fuel Tank
22
22
11.
Special Servicing
Tools and Aids
23
11.1
Special Servicing Tools 50
11.2
Servicing Aids
24
24
25
25
26
26
27
28
1.
SAFETY
PRECAUTIONS
28
28
If the chainsaw is started up in the
28
course of repairs or maintenance
29
work, observe all local and country-
specific safety regulations as well
as the safety precautions and
30
warnings in the owner's manual.
30
31
Gasoline is an extremely flamm-
31
able fuel and can be explosive in
33
certain conditions.
34
Improper handling may result in
34
burns or other serious injuries.
36
Warning! Do not smoke or bring
any fire or flame near the fuel. All
36
work with fuel must be performed
outdoors only. Spilled fuel must be
36
wiped away immediately.
37
38
Wash hands thoroughly after
38
every contact with waste oil.
39
Do not pour waste oil down the
39
drain or allow it to soak into the
41
ground.
41
Collect waste oil and take it to an
42
official disposal site for environ-
ment-friendly disposal.
43
44
45
46
46
47
47
48
50
52
© 2000 Andreas Stihl AG & Co., Waiblingen
1
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Summary of Contents for Stihl 021
-
Page 1: Table Of Contents
11.1 Special Servicing Tools 50 5.10 Decompression Valve 24 11.2 Servicing Aids Ignition System Spark Plug Boot Ignition Lead Ignition Module 6.3.1 Ignition Timing 6.3.2 Removing and Installing Flywheel © 2000 Andreas Stihl AG & Co., Waiblingen 021, 023, 025... -
Page 2: Introduction
Symbols are included in the text and pictures for greater clarity. As the design concept of model The meanings are as follows: 021, 023 and 025 chainsaws is almost identical, the descriptions In the descriptions: and servicing procedures in this •... -
Page 3: Specifications
Mix ratio: 50:1 with STIHL two-stroke engine oil 25:1 with other brand name two-stroke, air-cooled engine oils Air filter:Box filter, fabric or fleece filter Not adjustable 021 only up to serial number X 34 944 402 021, 023, 025... -
Page 4: Ignition System
3/8" P, 7-tooth spur sprocket 1123 640 2000 .325", 7-tooth spur sprocket 1123 640 2015 .325", 8-tooth spur sprocket 1123 640 2020 Side chain tensioner kit 1123 007 1000 3.5.2 For Service Carburetor parts kit 1123 007 1061 021, 023, 025... -
Page 5: Tightening Torques
This procedure ensures that the screw engages properly in the existing thread and does not form a new thread, which would weaken the assembly. 1) 023 L 2) On easy start version only 3) With quick chain adjuster Note: Power screwdriver speed settings for polymer: Plastoform screws max. 600 rpm DG screws max. 500 rpm 021, 023, 025... -
Page 6: Clutch Drum/Chain Sprocket
Note: If the clutch drum has to be replaced, also check the brake band - see 4.4.2. - Remove the rim sprocket, if fitted. • Pull off the clutch drum/chain sprocket. 021, 023, 025... -
Page 7: Chain Catcher
Push the locking strip (1) - Install the clutch drum/chain AV element (2) and engage the 0000 893 5903 into the cylinder. sprocket - see 4.1. peg (3) in the housing bore (4) at the same time. 021, 023, 025... -
Page 8: Chain Brake
Fit the shutter so that its lugs Carefully ease the brake spring engage the recesses in the off the anchor pin and take it off handle housing. the bell crank. - Install the air filter - see 10.1. 021, 023, 025... - Page 9 Up to serial number pivot pin (1). X 28 310 254, remove the spring (1). • Push the strap sideways and lift • it off the hand guard pivot pin (2). Pull out the cam lever (2). 021, 023, 025...
- Page 10 4.4.3 Assembly - Lubricate sliding and bearing points of chain brake with STIHL multipurpose grease or, preferably, Molykote grease - see 11.2. - From serial number X 28 310 255, install the flat spring. • • From serial number Position the hand guard (1)
- Page 11 - Fit the cover. - Tighten screws to 2.0 Nm (1.5 lbf.ft). - Install clutch drum/chain sprocket - see 4.1. • - Check operation of chain brake - Attach the brake spring to the see 4.4.1. bell crank. 021, 023, 025...
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Page 12: Front/Side Chain Tensioner
- Inspect the teeth on the spur install the chain tensioner. gear and adjusting screw. Replace both parts if necessary. Reverse the above sequence to install the chain tensioner. - Coat teeth of adjusting screw and spur gear with grease, 11.2, before refitting. 021, 023, 025... - Page 13 BUY NOW Then Instant Download the Complete Manual Thank you very much! ...