Technical Information · issue 37 of 2003
Technical description; Specifications; Noise and vibration data; Cutting tools; Deflector; Special accessories for the user; Service accessories; Spare parts; Repairs
IssueTI 37/2003
Full text
Page 1 of 5
STIH)
Technical Information
37.2003
New STIHL FS 38 brushcutter – Series 4140
Contents
1.
2.
Technical description
Specifications
3. Noise and vibration data
4. Cutting tools
5. Deflector
6. Special accessories for the user
7. Service accessories
8. Spare parts
9. Repairs
The new lightweight brushcutter STIHL FS 38
rounds off the bottom end of the range of
brushcutters and clearing saws.
The engine is enclosed in a compact housing
which also incorporates the multi-function handle.
The ergonomically designed controls and
advantageous power-to-weight ratio ensure
easy handling and operation without tiring.
The FS 38 has a curved shaft.
The applications and possible uses are the same
as for the STIHL FS 45.
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)m~ge 2 Technical Information 37.2003
1. Technical description 2. Specifications
The new brushcutter is driven by the "basic
2.1 Power unit
engine 4140" which has already proved its value in
many STIHL power tools (such as FS 45, FS 55, Displacement: 27.2 cm3
FC 55, HS 45, HL 45, BG 45, BG 55, SH 55, SH 85). Cylinder bore: 34 mm
Cylinder Piston stroke: 30 mm
Power output to 0.65 kW (0.9 HP)
. Four-port system (better mixture preparation,
ISO 8893: at 7000 rpm
optimum combustion and lower exhaust
emissions) Rewind starter: Single pawl system
Starter rope: 3 mm dia.,
. Large cooling-air area
1060 mm long
Crankshaft Clutch engages at: 3800 rpm
. Made up of five parts which are pressed Max. speed of
together to prevent torsion cutting tool: 9500 rpm
. Both ends mounted in bearings
Carburetor
2.2 Ignition system
. With three adjusting screws (H, L, LA), H screw
Ignition module: With integrated
with cap to limit the adjusting range
electronic speed
. With manually actuated fuel pump (purger)
fo governor
Air filter Spark plug (interference NGK BPMR 7 A
suppressed): Bosch WSR 6 F
. Felt filter with high separation efficiency and
long filter life Electrode gap: 0.5 mm
Exhaust muffler
. Two-chamber muffler, with spark arresting 2.3 Fuel system
screen in some countries
The engine must be operated with a mixture of
Clutch petrol and engine oil.
. With two unlined clutch shoes Fuel mix:
Branded regular grade petrol with a minimum octane
rating of 90 RON and high-quality two-stroke engine
oil for air-cooled high-performance two-stroke
engines.
Mixing ratio:
With STIHL 1 : 50 two-stroke engine oil:
1 : 50 = 1 part oil + 50 parts petrol
With any other branded two-stroke engine oil:
1 : 25 = 1 part oil + 25 parts petrol
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Technical Information 37.2003 Page 3
Carburetor: 4. Cutting tools
All-position diaphragm carburetor with integral
fuel pump
Low speed screw L open 1 turn
2
/L r
nu
ch
High speed screw H open max. 3/4 turn
(standard setting with caps) (as far as stop) 1
ch
nu
/L
Cut-off speed without tool
1
(electronic speed
governor): 9,500 +/- 800 rpm
Fuel tank capacity: 0.33 l (330 cm3)
2.4 Weight
2
Without cutting tool 4.1 kg
234TI001 KN
3. Noise and vibration data
Sound pressure level
Lpeq to EN ISO 7917 1) 91 dB(A)
The following cutting tools are approved:
Sound power level STIHL Autocut C 5-2
Lweq to EN ISO 10884 1) 103 dB(A)
mowing head 4006 710 2105
1) Values include idling and top speed with the STIHL Polycut 6-3
same duration of exposure mowing head 4006 710 2110
Vibration acceleration
to EN ISO 11680-1 5. Deflector
Idling
Left-hand handle 6.3 m/s2
Right-hand handle 3.5 m/s2
Top speed
Left-hand handle 5.6 m/s2
10.3 m/s2
Right-handle
234TI002 KN
The new deflector 4809 710 8101 is used on the
model FS 38. The cutting circle diameter equals
350 mm when using nylon line.
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6. Special accessories for the user
6.1 General
Part name Part No. Use
Harness 4130 710 9000
Starter rope 0000 195 8200 Rewind starter, also for ElastoStart
ElastoStart 0000 190 3400 Rewind starter (grip with rope)
STIHL gear lubricant Drive shaft in tube
- 80 g tube 0781 120 1109
- 225 g tube 0781 120 1110
STIHL special oil Rewind spring in rewind starter,
- 100 ml bottle 0781 417 1315 bearing bore in rope rotor
6.2 Mowing heads: nylon line and blades
Part name Part No. Use
Nylon line, 2 mm, green 0000 930 2217 Autocut C 5-2
Blades (set of 12) 4111 007 1001 Polycut 6-3
7. Service accessories
7.1 Special tools
The special tools are listed in the repair manual for
the FS 45 or basic engine 4140.
7.2 Service aids
Part name Part No. Use
Carburetor parts kit 4140 007 1060 Zama C1Q-S71 carburetor
Set of gaskets 4140 007 1050 Engine
Standard commercial, --- Cleaning the crankshaft stub
solvent-based
degreasant without
chlorinated or
halogenated
hydrocarbons
8. Spare parts
The spare parts list for the model FS 38 brushcutter
is integrated into the spare parts list for the model
FS 45 and will be available when the model is
launched on the market.
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Technical Information 37.2003 Page 5
9. Repairs
If the machine is started up in the course
of repairs, it is essential to observe all Repair procedure FS 38
country-specific safety regulations and the
safety precautions outlined in the user's 1 Remove and refit engine 10
manual. 2 Crankcase, pressure test* 55
3 Crankshaft, bearings, 55
9.1 Service note pressure test*
For servicing and repair procedures on the power 4 Sealing rings, pressure test* 55
tool, refer to the repair manuals for the STIHL 5 Crankcase leakage test, test run 55
basic engine 4140 and STIHL FS 45; see also
6 Cylinder, piston, pressure test* 55
STIHL Service Training System "Diagnosis".
7 Ignition system, contact* 10
8 Fuel supply, tank vent, test run 10
9.2 Tightening torques
9 Manifold or flange, pressure test -
The tightening torques for the engine and for the
shaft and gearbox are listed in the respective 10 Carburetor, check* 25
repair manuals. 11 Handle and throttle control 10
12 Rewind starter, test run 15
9.3 Mounting and dismounting the deflector 13 Clutch, test run 20
14 Muffler 10
2
15 Air filter 5
16 Stop switch, test run 20
17 Clutch housing -
18 Drive tube 15
1 19 Replace gear head or bearing
housing 5
20 Limit stop or deflector 5
21 Drive shaft 10
234TI003 KN
22 Fuel tank 10
23 Check compression pressure -
. Slide deflector onto the holder as far as possible 24 Adjust valve clearance -
. 25 Replace crankcase, bottom half -
Insert nut (1) in the hexagon socket on the
deflector – holes must line up 26 Replace crankshaft -
27 Replace cylinder, piston -
. Insert bolt (2) and screw in tightly
28 Oil supply -
9.4 Repair times 29 Oil pump, test run -
The specified repair times assume that the work
is performed by trained personnel in a properly
equipped service workshop.
The repair times are stated in minutes. * Test run under load
The following table can be added to the STIHL table
of repair times.
© ANDREAS STIHL AG & Co. KG, 2003 Technical Documentation
D1/MTK-ja 7939
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Extracted from the manufacturer's 2012 service catalogue. Most of these PDFs embed fonts with a shifted character map, so the text above was recovered rather than copied — read it as a faithful but imperfect transcription, and treat the page image above each block as the authority where the two disagree — the figures exist only there, because they are vector drawings that text extraction cannot keep.