Technical Information · issue 64 of 2007
Carburetor; Fuel tank; Filter cover; Easy2Start™; Pleated filter system; Flywheel; Catcher blade; Blade clearance adjuster kit; Summary
IssueTI 64/2007
Part changes (5)
| Was | Becomes | What the bulletin says |
|---|---|---|
| 4237 120 0601 | 4237 120 0604 | Carburetor The previous carburetor 4237 120 0601 with smooth connector will be replaced by the new carburetor 4237 120 0604 with barbed connector. |
| 4237 120 2200 | 4237 120 2202 | The previous flange 4237 120 2200 with smooth connector will be replaced by the new flange 4237 120 2202 with barbed connector. |
| 4229 122 6801 | 4237 122 6800 | The previous low speed adjustment screw 4229 122 6801 will be replaced by the new low speed adjustment screw 4237 122 6800. |
| 4282 350 1400 | 4237 350 1400 | 1 Connector The previous connector 4282 350 1400 will be replaced by the new connector 4237 350 1400. |
| 4237 140 1000 | 4237 140 1003 | Flywheel The previous filter cover 4237 140 1000 (for The new flywheel 4237 400 1202 can be used with standard filters) will be replaced by new filter cover the standard rewind starter or the new Easy2Start™ 4237 140 1003. |
Full text
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STIH)
Technical Information 64.2007
Hedge trimmers STIHL HS 81 R, HS 81 T – Series 4237
Hedge trimmers STIHL HS 86 R, HS 86 T – Series 4237
Contents
1. Carburetor
2. Fuel tank
3. Filter cover
4. Easy2Start™
5. Pleated filter system
6. Flywheel
7. Catcher blade
8. Blade clearance adjuster kit
9. Summary
1. Carburetor
The previous carburetor 4237 120 0601 with
smooth connector will be replaced by the new
carburetor 4237 120 0604 with barbed connector.
The previous flange 4237 120 2200 with smooth
connector will be replaced by the new flange
4237 120 2202 with barbed connector.
The previous low speed adjustment screw
4229 122 6801 will be replaced by the new low
speed adjustment screw 4237 122 6800.
With the introduction of the new carburetor the hose
clip 4205 122 2500 will no longer be used. The hose
clip will only be required when using the previous
carburetor 4237 120 0601.
442TI048 KN
Left: previous carburetor
Right: new carburetor
TI_64_2007_30_01_01.fm englisch / English USA
)m~ge 2 Technical Information 64.2007
1.1 Supply of spare parts 1.3 Service note
Only the new carburetor will be available as a spare To ensure that there are no leaks in the fuel system:
part.
. Fuel hoses should only be disconnected and
When the previous carburetor or previous flange is installed by hand in order to avoid damaging the
replaced by a new carburetor or new flange, the fuel barbed connector. Sharp-edged pliers,
return hose must be shortened to 6.70 in (170 mm). screwdrivers, etc. must not be used – nor should
An illustrated supplement with installation fuel hoses be cut open with a knife or similar
instructions will be enclosed with the new carburetor implement.
and flange.
. Fuel hoses must not be reused after being
disconnected. They must always be replaced by
1.2 Installation of the fuel return hose
new hoses. Fuel hoses may be over-extended
when disconnected.
. New fuel hoses must be installed in a dry
condition or with the aid of Press Fluid OH 723
– 0781 957 9000.
. When using Press Fluid OH 723, coat the ends
of hoses and connectors with Press Fluid
OH 723 prior to installing the new hoses onto
the barbed connectors.
442TI049 KN
Note concerning Press Fluid OH 723
Press Fluid OH 723 creates a lubricant film to aid in
With the previous carburetor, the fuel return hose
assembly. The lubricant evaporates after a short
had to be 7.48 in (190 mm) long and pushed fully
while allowing for a tight fit.
onto the connector on the carburetor housing as
illustrated. The fuel return hose was secured with Never use fuel, oil or grease as a lubricant. Fuel, oil
the present hose clip. and grease does not evaporate and may allow the
hose to slip from the connector.
442TI050 KN
The new carburetor requires the fuel return hose to
be shortened to a length of 6.70 in (170 mm) and
fully installed onto the barbed connector as
illustrated.
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Technical Information 64.2007 Page 3
2. Fuel tank 2.1.1 Removing the previous connector
With the introduction of the new carburetor and fuel . Drain and remove the fuel tank, see service
tank connector a new fuel tank 4237 350 0450 with manual.
a shorter fuel return hose will be used.
A fuel return hose with a length of 7.48 in (190 mm)
will be enclosed with the new tank so it can be
installed in older machines.
442TI052 KN
. Disconnect the fuel hoses from the carburetor
(arrows).
442TI051 KN
Information on installation of the fuel return hose
can be found in section 1.2. An illustrated
supplement with installation instructions will be
enclosed with the new fuel tank.
2.1 Connector
The previous connector 4282 350 1400 will be
replaced by the new connector 4237 350 1400. The
442TI053 KN
new connector will only be available as a spare part
complete with fuel hose. Fuel hose 4237 358 0800
will no longer be available as a spare part. . Gently pry out the connector with the aid of the
tab (arrows) and remove.
1
442TI054 KN
. Install the new fuel return hose (1) and new fuel
supply hose (2) to the new connector (3). The
nipple for the fuel supply hose is identified on
the connector by a carburetor symbol.
. Prior to installation, coat the O-ring and bead of
connector with Press Fluid OH 723.
TI_64_2007_30_01_01.fm
)m~ge 4 Technical Information 64.2007
2.1.2 Installing the new connector 2.1.3 Testing the fuel tank for leaks
442TI046 KN
1 2
. Drain the fuel tank.
. Disconnect the fuel supply hose (1).
. Install connector (2) 0000 855 9200 to fuel
442TI055 KN
supply hose.
. Insert the hose (1) into the fuel tank.
1
442TI056 KN
. Locate the tab on the connector (1) so it lines up 442TI047 KN
with the groove in the tank (arrow).
. Press the connector (1) home with a suitable
tool until it engages with a click.
. Connect pump 0000 850 1300 to connector
. Assemble the remaining parts in the reverse (arrow) and supply 0.5 bar of pressure to fuel
sequence. tank.
The fuel tank must always be tested for leaks This pressure must be maintained for at least
after assembly. 20 seconds. If the pressure drops, locate the leak.
. Verify the connector and O-ring has been
installed correctly.
. Examine the fuel tank for signs of damage.
. Check the tank vent.
TI_64_2007_30_01_01.fm Page 3 of 7
Technical Information 64.2007 Page 5
3. Filter cover 6. Flywheel
The previous filter cover 4237 140 1000 (for The new flywheel 4237 400 1202 can be used with
standard filters) will be replaced by new filter cover the standard rewind starter or the new Easy2Start™
4237 140 1003. system.
4. Easy2Start™
4.1 New model STIHL HS 81 TCE
The new model STIHL HS 81 TCE (Easy2Start™)
will use a new fan housing with rewind starter
4234 080 2104 and new flywheel 4237 400 1202.
The new fan housing with rewind starter may only
be installed in machines with the new flywheel
4237 400 1202.
See spare parts list for further details. The flywheel has two threaded domes so it can be
removed with puller 1135 890 4500.
4.2 Service note
When servicing the starter assembly, coat the post
of the rope rotor, pawl spring and peg of the pawls
with grease 0781 120 1111.
PLEASE NOTE:
The rewind spring for the starter rope may pop out
of position during disassembly.
5. Pleated filter system
5.1 New model STIHL HS 81 TCE
The new model STIHL HS 81 TCE (Easy2Start™)
will also use a new pleated filter system which will
include a new filter housing 4237 140 2802,
grommet 4134 123 7500, filter cover
4237 140 1002, air filter 4237 141 0300 and a new
carburetor with compensator 4237 120 0606 and
barbed flange 4237 120 2201.
TI_64_2007_30_01_01.fm
)m~ge 6 Technical Information 64.2007
7. Catcher blade 8. Blade clearance adjuster kit
442TI058 KN
442TI057 KN
New special accessory "Catcher blade 750 mm / New special accessory "Blade clearance adjuster kit
30" R" 4237 740 3302 for model HS 86 R. 600 mm / 24" R" (4237 007 1008) for model
HS 81 R.
442TI059 KN
New special accessory "Blade clearance adjuster kit
750 mm / 30" R" (4237 007 1009) for models
HS 81 R and HS 86 R.
TI_64_2007_30_01_01.fm Page 4 of 7
Technical Information 64.2007 Page 7
9. Summary
Item Part Name Previous New Remarks
1 Carburetor C1Q-S105 4237 120 0601 --- 1)
2 Carburetor C1Q-S115; including Items 3 and 4 --- 4237 120 0604 2)
3 Flange 4237 120 2200 4237 120 2202 1) 2)
4 Low speed adjustment screw 4229 122 6801 4237 122 6800 1) 2)
5 Hose clip 4205 122 2500 --- 3)
6 Fuel tank; including Item 7 4237 350 0405 4237 350 0450 1) 2)
7 Connector 4282 350 1400 4237 350 1400 1) 2)
8 Fuel hose 4237 358 0800 --- 1)
9 Filter cover for standard filter 4237 140 1000 4237 140 1003 1) 2)
10 Fan housing with rewind starter (Easy2Start™) --- 4237 080 2104
11 Filter housing --- 4237 140 2802
12 Grommet --- 4134 123 7500
13 Air filter --- 4237 141 0300
14 Filter cover --- 4237 140 1002
15 Carburetor C1Q-S140 with compensator; --- 4237 120 0606
including Item 16
16 Flange --- 4237 120 2201
17 Flywheel 4237 400 1201 4237 400 1202 1) 2)
18 Catcher blade 750 mm / 30" R --- 4237 740 3302
19 Blade clearance adjuster kit 600 mm / 24" R --- 4237 007 1008
20 Blade clearance adjuster kit 750 mm / 30" R --- 4237 007 1009
Modification to be introduced continuously
Remarks
1) Previous version of part no longer available from factory
2) New version of part can also be used with older machines
3) Previous version of part remains available from factory
© ANDREAS STIHL AG & Co. KG, 2007 Technical Documentation
D1/MTK-fr
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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.