Technical Information · issue 4 of 1997
HS 72 ... 85: Gearbox; Cutting blade assemblies; F
Model HS 72, 74, 76, 75, 80, 85 Hedge Trimmers==============- Series 4226
IssueTI 4/1997
From serial 32 106 939, 34 573 587
Part changes (4)
| Was | Becomes | What the bulletin says |
|---|---|---|
| 4221 353 9201 | 0000 989 0516 | The grommet 4221 353 9201 included in the fuel tank 4226 350 0405 and fuel hose kit 4226 007 1001 will be replaced by grommet 0000 989 0516. |
| 4226 141 0300 | 4226 141 0301 | 4226 141 0300 will be replaced by debris filter 4226 141 0301 from machine number X 34 573 587. |
| 4226 129 0901 | 4226 129 0902 | The gasket 4226 129 0901 between the cylinder and spacer flange will be replaced by gasket 4226 129 0902. |
| 4226 350 3500 | 0000 350 3503 | 366TI017 KN Pick-up body 4226 350 3500 will be replaced by the optimized version 0000 350 3503. |
Full text
Page 1 of 7
Technical Information
04.97
Model HS 72, 74, 76, 75, 80, 85 Hedge Trimmers==============- Series 4226
&RQWHQWV
1. Gearbox (gear ratio)
2. Cutting blade assemblies (modified blades)
3. Fuel tank/grommet
4. Prefilter (standardization)
5. Fuel filler cap assy. (filter, gasket, pick-up body)
6. Carburetor WT 412 (control valve)
1.=Gearbox
The blade speed will be increased to further
improve cutting quality.
From machine number X 36 360 021 the gear ratio
will be changed from 7.1 to 5.6. 1
The parts affected by this change are listed on the
summary. The main differences are shown in the
following illustrations.
Service notes
Original and new versions of the parts cannot be
used together in any combination.
2
Original and new versions of gearbox housing
covers will come with the correct gasket for
366TI005 KN
easy replacement.
Gearbox housing
1 = Old version
2 = New version
1 2
366TI008 KN
1 = Old version (bushing)
2 = New version (needle sleeve)
)Technical Information 04.97 - Page 2
1 1
2 2
366TI007 KN
366TI006 KN
Gearbox housing cover Gasket
Z = 57 Z = 56
Z=8 Z =10
366TI009 KN
366TI010 KN
1 2 1 2
Spur gear (Z = teeth) Clutch drum (Z = teeth)
1
1
2
366TI012 KN
Thrust plate
2
366TI011 KN
Connecting rod All illustrations:
1 = Old version
2 = New version
)Technical Information 04.97 - Page 3
6XPPDU\
Item Part Name Original New Rem.
version version
1 Gearbox housing; 4226 640 0500 4226 640 0501 1)
including items 2 to 6:
2 Ball bearing 9503 003 5290 9503 003 5382 1)
3 bushing 4226 642 9700 --- 1)
4 Circlip 9456 621 3600 9456 621 3860 1)
5 Needle sleeve --- 9513 003 0912
6 Roll pin 6 x 12 --- 9381 003 2070
7 Clutch drum 4226 160 2900 4226 160 2901 1)
8 Spur gear 4226 640 7500 4226 640 7504 1)
9 Connecting rod (2x) 4206 642 6500 4226 642 6501 1)
10 Thrust plate (2x) 4211 642 4800 4230 642 4800 2)
11 Circlip 9455 621 1380 9455 621 1670 1)
12 Gearbox housing cover; 4226 640 5800 4226 640 5850 1)
including items 13 to 15:
13 Screw plug 4117 713 6501 4226 641 6500 2)
14 Bushing 4226 642 9700 --- 1)
15 Needle sleeve --- fo 9513 003 0912
16 Gasket 4226 649 0300 4226 649 0302 3)
Modification to be introduced from machine number X 36 360 021
5HPDUNV
1) Original version of part remains available as spare for older models
2) Original version of part will be supplied from factory only as long as existing stocks last
3) Original and new versions of part included in scope of supply of respective gearbox housing cover in future
)Technical Information 04.97 - Page 4
2.=Cutting blade assemblies
The original cutting blade assemblies have been
replaced by new versions (for part numbers see
Summary) in connection with the modifications
described in chapter 1. The new versions of the 1
blades have longer slots.
28 mm
Service notes
These cutting blade assemblies should also be (1.10 in)
used for older machines.
Before installing individual blades, check the
length of the first slot (see illustration).
Original-type blades must not be used with the==================O
new version of the gearbox =see chapter 1.=.
31 mm
366TI014 KN
(1.22 in)
1 = Old version
2 = New version
6XPPDU\ fo
Item Part Name Original New Rem.
version version
1 Cutting blade assy. 420 DS; (16") 4226 710 5930 4226 710 5931 1)2)
including item 2:
2 Blade, 420 DS (16") 4226 710 6006 4226 710 6026 1)2)
3 Cutting blade assy. 550 DS; (21") 4226 710 5900 4226 710 5901 1)2)
including item 4:
4 Blade, 550 DS 4226 710 6000 4226 710 6020 1)2)
5 Cutting blade assy. 700 DS; (27") 4226 710 5940 4226 710 5941 1)2)
including item 6:
6 Blade, 700 DS (27") 4226 710 6003 4226 710 6023 1)2)
7 Cutting blade assy. 550 ES; (21") 4226 710 5910 4226 710 5911 1)2)
including items 8 and 9:
8 Blade, top, 550 ES (21") 4226 710 6001 4226 710 6021 1)2)
9 Blade, bottom, 550 ES (21") 4226 710 6002 4226 710 6022 1)2)
10 Cutting blade assy. 700 ES; (27") 4226 710 5920 4226 710 5921 1)2)
including items 11 and 12:
11 Blade, top, 700 ES (27") 4226 710 6004 4226 710 6024 1)2)
12 Blade, bottom, 700 ES (27") 4226 710 6005 4226 710 6025 1)2)
13 Cutting blade assy. 1000 ES; (39") 4226 710 5950 4226 710 5951 1)2)
including items 14 and 15:
14 Blade, top, 1000 ES (39") 4226 710 6007 4226 710 6027 1)2)
15 Blade, bottom, 1000 ES (39") 4226 710 6008 4226 710 6028 1)2)
All other parts as before
Modification to be introduced for item 10: from machine number X 36 209 590
5HPDUNV
1) Original version of part will be supplied from factory only as long as existing stocks last
2) New version of part can also be used for older machines
)Technical Information 04.97 - Page 5
3.=Fuel tank/grommet
The grommet 4221 353 9201 included in the
fuel tank 4226 350 0405 and fuel hose kit
4226 007 1001 will be replaced by grommet
0000 989 0516.
6XPPDU\
Item Part Name Original New Rem.
version version
1 Fuel tank; 4226 350 0405 4226 350 0405 1)
2 Fuel hose kit; 4226 007 1001 4226 007 1001 1)
each of above includes:
3 Grommet 4221 353 9201 0000 989 0516 2)
Modification to be introduced: in progress
5HPDUNV
1) Only modified version of part is available from factory
2) Original version of part remains available as spare for other models
4.=Prefilter
To further standardize inventories, the debris filter
4226 141 0300 will be replaced by debris filter
4226 141 0301 from machine number
X 34 573 587.
366TI016 KN
6XPPDU\
Item Part Name Original New Rem.
version version
1 Debris filter 4226 141 0300 4226 141 0301 1)
Modification to be introduced from machine number X 34 573 587
5HPDUNV
1) Original version of part no longer available from factory
)Technical Information 04.97 - Page 6
5.=Fuel filler cap assembly
Filter 0000 358 1810 will be included with fuel
filler cap 4226 350 0501 from machine number
X 32 106 939=to further improve its function.
The gasket 4226 129 0901 between the cylinder
and spacer flange will be replaced by gasket
4226 129 0902.
366TI017 KN
Pick-up body 4226 350 3500 will be replaced by
the optimized version 0000 350 3503.
1 2
366TI015 KN
1 = Old version
2 = New version
6XPPDU\
Item Part Name Original New Rem.
version version
1 Fuel filler cap assembly; 4226 007 1002 4226 007 1002 1)
including items 2 and 3:
2 Pick-up body 4226 350 3500 0000 350 3503 2)
3 Gasket 4226 129 0901 4226 129 0902 3)
4 Fuel filler cap; 4226 350 0501 4226 350 0501 1)
including:
5 Filter --- 0000 358 1810
Modification to be introduced: in progress, for item 5 from machine number X 32 106 939
for item 2 from machine number X 36 287 313
5HPDUNV
1) Only modified version of part is available from factory
2) Original version of part will be supplied from factory only as long as existing stocks last
3) Original version of part no longer available from factory
)Technical Information 04.97 - Page 7
6.=Carburetor WT 412
WT 6 WT 6
Control valve 4226 120 8701 will be installed in
the WT 412 carburetor 4226 120 0603 in place of 412 20 412A 49
control valve 4133 120 8701 in order to ensure
maximum engine power and reliability when using
cutting blade assemblies of different lengths.
The type designation of the carburetor with this
control valve changes from WT 412=to WT 412 A.
366TI013 KN
Left: Old version
Right: New version
6XPPDU\
Item Part Name Original New Rem.
version version
1 Carburetor WT 412 4226 120 0603 4226 120 0603 1)
2
including:
Control valve
4133 120 8701 4226 120 8701 2)
Modification to be introduced: in progress
5HPDUNV
1) Unmodified version of part will be supplied until existing factory stocks are exhausted
2) Original version of part remains available for other models
Last Technical Information on models
HS 72, 74, 76: 02.95
HS 75, 80, 85: 17.96
1997 Andreas Stihl Andreas Stihl - D1/MTK-al
Technical Documentation 5919 Page 2 of 7
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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.