Technical Information · issue 4 of 2003
Technical description; Specifications; Versions wi
IssueTI 4/2003
Full text
Page 1 of 4
Technical Information
04.2003
Trimmers STIHL FS 45 C, FS 46 C, FS 55 C – Series 4140
CombiEngine STIHL KM 55 C – Series 4140
Contents
1. Technical description
2. Specifications
3. Versions with Easy2Start
4. Service notes
5. Summary
1. Technical description
Additional new versions of the models FS 45 C,
1.1 Function of the starter system with
FS 46 C, FS 55 C and KM 55 C are now available
with Easy2Start for distinctly more convenient Easy2Start
starting. A helical spring stores the energy
produced as the starter rope is pulled and transfers F1
this energy to the engine via drive lugs.
This yields the following advantages for the user:
F2
. Significantly less effort is needed to start the
4
engine.
5
. Individual peak forces due to the compression
process are no longer felt on the starter handle. 1
2
233TI026 KN
. The speed required to pull the starter handle is
3
reduced considerably.
A spring housing (1) with spring (2) and two drive
lugs (3, 4) are installed between the rope rotor and
the crankshaft. Force F1 when pulling on the starter
rope tensions the spring (2) against the opposing
force F2 generated by the piston (5) during
compression.
When the torque of the prestressed spring (2)
exceeds the resultant torque of force F2, the
crankshaft turns and the engine starts.
TI_04_2003_02_01_01.fm englisch / english
)m~ge 2 Technical Information 04.2003
1.2 Starting effort
(N)
The effort required to start the engine is reduced
significantly.
Individual peak forces due to the compression a
process are not transmitted to the starter handle. b
This is perceived by the user as smoother starting.
a = FS 55 Standard model
b = FS 55 C with Easy2Start
233TI028 KN
Vertical axis: Starting effort
0
Horizontal axis: Turns of the crankshaft 0 1 2 3 4
1.3 Mechanical design of the starter system
with Easy2Start
4
8 11
10
12
1 5
6 7
9 14
13 17
233TI027 KN
1 = Starter mechanism 1) 10 = Washer 1)
2 = Handle 2) 11 = Spring housing with spring 1)
3 = Starter rope 1) 12 = Drive lug 1)
4 = Model plate 1) 13 = Washer 1)
5 = Rewind spring 2) 14 = Screw IS-M5x10-10.9 1)
6 = Rope rotor 1) 15 = Pawl 1)
7 = Pawl 2) 16 = Leg spring 1)
8 = Washer 2) 17 = Drive lug 1)
9 = Spring 2)
1) New part for Easy2Start versions
2) Same part as previously in Standard version
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Technical Information 04.2003 Page 3
2. Specifications 2.3 Dimensions
The specifications for all versions remain
unchanged except for the weight, dimensions of the
starter rope and overall length of the power tool.
2.1 Weight
25 mm
Versions with Easy2Start are approx. 8 ounces
heavier than the standard versions.
FS 45 C with Easy2Start
233TI029 KN
FS 45 C 9.5 lbs. (4,3 kg)
FS 46 C with Easy2Start The overall length of all versions with Easy2Start
increases by 25 mm (approx. 1 in.).
FS 46 C 9.5 lbs. (4,4 kg)
FS 46 C Kat 9.9 lbs. (4,5 kg)
3. Versions with Easy2Start
The following versions with Easy2Start are
FS 55 C with Easy2Start available:
FS 55 C1)
FS 55 RC
11.5 lbs. (5.2 kg)
11.0 lbs. (5.0 kg)
FS 45 C with Easy2Start
FS 45 C
FS 55 C Kat1) 11.7 lbs. (5.3 kg)
FS 55 RC Kat 11.2 lbs. (5.1 kg)
1)
Version with bike handle FS 46 C with Easy2Start
R Version with loop handle FS 46 C
FS 46 C Kat
KM 55 C with Easy2Start
KM 55 RC 9.3 lbs. (4.2 kg)
FS 55 C with Easy2Start
KM 55 RC Kat 9.5 lbs. (4.3 kg)
FS 55 C1)
R Version with loop handle FS 55 RC
FS 55 C Kat1)
2.2 Starter rope
FS 55 RC Kat
Starter rope 4137 195 8200 (2.7 x 910 mm-36 in.) is
1)Version with bike handle
used in all versions with Easy2Start.
R Version with loop handle
KM 55 C with Easy2Start
KM 55 RC
KM 55 RC Kat
R Version with loop handle
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)m~ge 4 Technical Information 04.2003
4. Service notes 4.3 Spring
The specific national safety regulations and the The spring (9) 1118 195 3500 must be lubricated
safety instructions in the Owner's Manual must be with STIHL gear lubricant 0781 120 1117 or
observed if the machine has to be started. 0781 120 1118 when necessary.
The item numbers in brackets, such as (10), refer to Undo screw (14) IS-M5x10-10.9 for this purpose.
the illustration in section 1.3.
4.4 Screw IS-M5x10-10.9
4.1 Tensioning the rewind spring The screw (14) IS-M5x10-10.9 securing the drive
The rewind spring is tensioned as described in the lug to the spring housing has a microcapsule of
corresponding Repair Manual for series 4140. adhesive applied to it. Either a new screw must be
fitted during assembly or the old screw must be
The only difference is that it must be possible to turn resecured with Loctite 242.
the rope rotor at least two turns before the rewind
spring reaches its maximum travel. 4.5 Tightening torques
Screw (14) 5 Nm Drive lug on
4.2 Spring housing with spring
IS-M5x10-10.9 44 in. lbs spring housing
The spring housing with spring (10) 4140 190 0710
Drive lug (17) 17 Nm Drive lug on
must be lubricated with STIHL gear lubricant
12 ft. lbs crankshaft
0781 120 1117 or 0781 120 1118 when necessary.
Screw IS-M5x10-10.9 must be unscrewed and the
drive lug removed for this purpose. The spring must
never be removed from the spring housing: risk of
injury if the pretensioned spring jumps out
uncontrollably.
5. Summary
Item Part name Part No. Remarks
1 Starter mechanism 4140 190 4010
2 Rope rotor 4140 195 0410
3 Starter rope dia. 2.7x910 mm (36 in) 4137 195 8200
5 Spring housing (with spring) 4140 190 0710
6 Drive lug 4140 195 2010
7 Washer DIN9021-A5,3 9307 021 0120
8 Screw IS-M5x10-10.9 9022 399 0950
9 Model plate FS 45 C 4140 967 1515
10 Model plate FS 46 C 4140 967 1516
11 Model plate FS 55 C 4140 967 1517
13 Model plate KM 55 RC 4140 967 1520
14 Drive lug 4140 190 2010
15 Leg spring 0000 998 0612
16 Pawl 4133 195 7201
All other parts as before
Last Technical Information on the STIHL FS 45, FS 55, KM 55: 36.2002
© ANDREAS STIHL AG & Co. KG, 2003 Technische Dokumentation
D1/MTK-ja 7850
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