Technical Information · issue 15 of 2003
Carburetor; Cylinder gasket; Oil seals (crankshaft); Rotating handle holder / mowing handle (FS 80, FS 85, KM 85); Engine mounting (FR 85, FR 85 T, HLR 85, HTR 85); Solid shaft (FS 85); Clamps / handle (torque, only for machines with wraparound h
IssueTI 15/2003
Full text
Page 1 of 8
STIH)
Technical Information
15.2003
STIHL FH 75 power scythe – Series 4230
STIHL HL 75 hedge trimmer – Series 4230
STIHL HT 70, HT 75 pole pruners – Series 4138
STIHL FC 75, FC 85 edger fo – Series 4137
STIHL KW 85 PowerSweep – Series 4602
STIHL KM 85 KombiEngine – Series 4137
STIHL FS 75, FS 80, FS 85 brushcutters – Series 4137
Contents
1. Carburetor
1.1 Features of the new carburetor
1.2 Mechanical design
1.3 Functions of the cap on the high speed adjusting screw
1.4 Flange, seal and metering diaphragm
1.5 Set of carburetor parts
1.6 Maintenance / repair
1.7 Summary
2. Cylinder gasket
2.1 Service note
2.2 Note for blowers and hedge trimmers
2.3 Summary
3. Oil seals (crankshaft)
4. Clamps / handle (torque, only for machines with wraparound handle)
TI_15_2003_02_01_01.fm englisch / English USA
)m~ge 2 Technical Information 15.2003
1. Carburetor 1.2 Mechanical design
5
1
2
3
233TI021 KN
233TI020 KN
Left: Previous carburetor C1Q-S63A . Low speed adjusting screw (1)
Right: New carburetor C1Q-S69
. High speed adjusting screw (2)
. Cap (3) for high speed adjusting screw
Carburetor C1Q-S63A is replaced by the new
. Idle speed adjusting screw (4)
version C1Q-S69 to bring the carburetors into line
with other series and to improve machine operation. . Stop (5)
1.1 Features of the new carburetor
. Short cap for the high speed adjusting screw – 1.3 Functions of the cap on the high speed
the cap can be removed with a special tool. adjusting screw
270°
392TI061 KN
233TI022 KN
. Integrally moulded stop (arrow) for the high When the cap (1) is firmly connected to the high
speed adjusting screw on the carburetor body. speed adjusting screw, the screw can be turned
through 270 degrees (3/4 turn).
. Robust flange with new shape – cannot become
deformed when tightening the screws (see 1.4).
. Symmetrically shaped gasket and metering
diaphragm (see 1.4).
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Technical Information 15.2003 Page 3
1.4 Flange, seal and metering diaphragm
The shape of the new flange (3) and of the
1 corresponding metering diaphragm (4) and
gasket (5) has been modified.
2 The new flange has greater dimensional stability
and ensures uniform pressure on the gasket and
metering diaphragm. The new flange is designed in
such a way that it can also be fitted in the previous
carburetors together with the previous gasket and
metering diaphragm versions. For this reason, the
3
new flange should also be installed in all previous
carburetors C1Q-XXX when making repairs. The
4 combinations listed in the table below must be noted
in this context.
5 The symmetrical shape of the new gasket (5)
prevents incorrect installation. The new metering
diaphragm (4) is also symmetrical in shape, but
392TI060 KN
must be installed in the predefined position.
Left: Previous version
Right: New version
Carburetor type C1Q-S63A C1Q-S56 C1Q-S28D
(Part No.) (4137 120 0606) (4137 120 0604) (4137 120 0600)
C1Q-S41A
(4137 120 0602)
C1Q-S45
(4137 120 0603)
Screws (1, qty of 4 req.) ---* ---* 4226 122 7100
Cover (2) ---* ---* 4140 121 0800
Flange (3) 4228 120 2200** 4228 120 2200** 4228 120 2200**
Metering diaphragm (4) 4129 121 4700 4129 121 4700 4129 121 4700
Gasket (5) 1129 129 0900 4129 129 0902 4129 129 0902
* Part is already present in carburetor
** Part is included in the set of carburetor parts
4140 007 1060
1.5 Set of carburetor parts
The set of carburetor parts 4140 007 1060 or
4229 007 1060 can be used for the new carburetor.
The two sets only differ with regard to the flange
4228 120 2200. This flange is additionally available
as version 4140 007 1060. The various parts
contained in the set are listed in "1.7 Summary".
TI_15_2003_02_01_01.fm
)m~ge 4 Technical Information 15.2003
1.6 Maintenance / repair . Set the carburetor, see 1.6.1 "Basic setting
without cap on the high speed adjusting
screw".
Then make the adjustment for the user if
necessary, see also 1.6.2.
1.6.1 Basic setting without cap on the high
speed adjusting screw
256TI024 KN
1 2
The cap must be removed from the high speed H L
adjusting screw to replace a defective high speed
adjusting screw or to clean the carburetor:
. Slide the puller 5910 890 4501 (1) between the
cap (2) and the carburetor housing.
. Pry off the cap.
256TI025 KN
If the cap remains stuck on the screw:
. Turn the puller so that the closed side of the
U-shaped blade faces towards the carburetor
housing. . Carefully turn the adjusting screws (H) and (L) in
as far as possible.
. Slide the puller under the cap.
. Back off the high speed adjusting screw (H) by
. Pry the cap off completely. 1 1/2 turns.
Caps must not be reused. . Back off the low speed adjusting screw (L) by
1 turn.
Adjustment after maintenance / repair
. Check the air filter and clean or replace it if Fixing the cap on the high speed adjusting
necessary. screw
. Check whether the muffler / spark arresting
screen is coked up and clean or replace it / them
if necessary.
If possible on existing models:
. Check setting of the throttle cable and adjust if
necessary (see TI 24.2002, "Adjusting the
throttle cable").
. Check fuel filter and replace if necessary.
256TI026 KN
Used caps must not be reused!
. Align a new cap with the rich stop (arrow) and
press it on until it distinctly clicks into the
second locking position.
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Technical Information 15.2003 Page 5
Machine runs erratically when idling,
a poor acceleration, engine stops –
the low speed setting is too lean.
. Turn the low speed adjusting screw (L) approx.
1/4 turn counterclockwise until the engine runs
uniformly and accelerates well.
Machine runs erratically when idling,
engine stops when swivelling –
256TI027 KN
the low speed setting is too rich.
. Turn the low speed adjusting screw (L) approx.
Do not press the cap on until it rests on the 1/4 turn clockwise until the engine runs
carburetor housing, otherwise it will be damaged: uniformly and accelerates well.
distance a = 1 mm.
At least one change must be made on the idle speed
adjusting screw (LA) whenever the low speed
Adjust idle speed adjusting screw (L) has been adjusted.
1.6.2 Standard setting with the cap on the high
speed adjusting screw
The procedure described for the user in the user
manuals has not changed.
250TI052 KN
. With the idle speed adjusting screw (LA),
set the speed to 2800 rpm with a tolerance of
+/-200 rpm.
The setting must be made with a tachometer.
1.7 Summary
Item Part name Previous New Remarks
1 Carburetor C1Q-S63A 4137 120 0606 --- 1)
2 Carburetor C1Q-S69 --- 4137 120 0608 2)
3 Set of carburetor parts; 1129 007 1062 --- 3)
including Items 7 to 10:
4 Set of carburetor parts; --- 4140 007 1060
including Items 6 to 10:
5 Set of carburetor parts; --- 4229 007 1060
including Items 7 to 10:
6 Flange 4140 120 2200 4228 120 2200 3)
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)m~ge 6 Technical Information 15.2003
Item Part name Previous New Remarks
7 Gasket 1129 129 0900 4229 129 0901 3)
8 Metering diaphragm 4129 121 4700 4229 121 4700 3)
9 Pump diaphragm 1129 121 4800 1129 121 4800 3)
10 Gasket 1123 129 0905 1123 129 0905 3)
Changes to be introduced
Production USA FS 80 as from serial No. 2 61 042 486
HT 75 as from serial No. 2 61 045 094
continuously in all other series
Remarks
1) Previous version of part is no longer available
2) Individual parts of the new carburetor: see spare parts list for the machine concerned
3) Previous version of part remains available
2. Cylinder gasket 2.1
Service note
392TI059 KN
392TI058 KN
1 2 3 4
In conjunction with the standardization of parts, the The transfer ports of the previous cylinders
cylinder base gasket (1) 4137 029 2300 is replaced differ from those of the new cylinders. Gasket
in production by version (2) 4140 029 2300. 4137 029 2300 must continue to be used for the
previous cylinders (3). Gasket 4140 029 2300
The new gasket cannot be used in previous can be used for the new cylinders (4) (see table in
machine versions. The individual cylinders and section 2). Further information on changes in
cylinder gaskets can be combined as follows: cylinders and cylinder gaskets can be found in
Cylinder with piston Cylinder gasket Technical Information sheets 16.2001 and 32.2001.
4137 020 1200 4137 029 2300
4137 020 1201 4137 029 2300
4137 020 1202 4140 029 2300
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Technical Information 15.2003 Page 7
2.2 Note for blowers and hedge trimmers
Only the cylinders with piston 4137 020 1200 and
1201 have been installed in the models BG 75,
HS 75, 80 and 85.
2.3 Summary
Item Part name Previous New Remarks
1 Cylinder gasket 4137 029 2300 4140 029 2300 1)
Modification introduced in progress
Remarks
1) Previous version of part remains available
3. Oil seals (crankshaft)
To facilitate installation, new 5 mm wide oil seals
9640 003 1195 have been installed instead of the
7 mm wide oil seals 9640 003 1200 (arrows) from
serial No. 2 61 274 110 onwards.
The new oil seals can also be used in existing
machines.
The oil seals are fitted in the same way as before.
n 392TI062 KN
Summary
Item Part name Previous New Remarks
1 Oil seal
DIN3760-BS12x22x7 9640 003 1200 --- 1)
2 Oil seal
DIN3760-BS12x22x5 --- 9640 003 1195
Modification to be introduced from serial No. 2 61 274 110
Remarks
1) Previous version of part is no longer available after stocks are depleted
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)m~ge 8 Technical Information 15.2003
4. Clamps / handle
(torque, only for machines with
wraparound handle)
2
1
392TI057 KN
2
1
The two screws (1) for the clamps (2) must be
tightened with a torque of 5 Nm.
Last Technical Information on the STIHL FC 75, 85 24.2002
FH 75 24.2002
FS 75, FS 80, FS 85 24.2002
HL 75 24.2002
HT 70, HT 75 38.2002
KM 85, KM 85 R 24.2002
KW 85 24.2002
© ANDREAS STIHL AG & Co. KG, 2003 Technical Documentation
D1/MTK-na 8057
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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.