Technical Information · issue 47 of 2000
Gearhead (guard rings)
Model FS 220, FS 280 Clearing Saws – Series 4119
IssueTI 47/2000
Full text
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Technical Information
47.2000
Model FS 220, FS 280 Clearing Saws – Series 4119
Contents
1. Gearhead (guard rings)
1.1 Guard rings
1.2 Guard ring mounting
1.3 Screws with microencapsulated adhesive
1.4 Summary
1. Gearhead (guard rings)
The gear housing (1) has M5 tapped holes.
Replacement gear housings come with three
IS M5x10 spline socket head screws.
1 1.3 Screws with microencapsulated
adhesive
4 5
324TI000 KN
2 2
324TI003 KN
3 3
1.1 Guard rings Screw with coated thread
Hardened versions of the guard rings (4 – for
mowing; 5 – for sawing) have been installed for
some time. Screws that have to be secured in the component
with adhesive are being increasingly supplanted by
1.2 Guard ring mounting screws which are themselves the carrier or supplier
The new hardened guard rings are secured with of the adhesive.
metric screws (3) whose threads are treated with a
microencapsulated adhesive (see 1.3) instead of
Benefits
the previous IS DG 5x12 self-tapping spline socket
head screws (2). . It is not necessary to apply the adhesive by
machine on the production line or manually
“from the tube” when carrying out repairs.
. The user is not inconvenienced by fumes from
the adhesive.
TI_47_2000_01_01.fm englisch / english
)m~ge 2 Technical Information 47.2000
. There is no need to stock special adhesives - adhesive determine the strength of the screwed
which often have a limited shelf life. joint.
. The amount of adhesive is exactly metered for
the joint in question. This, in turn, simplifies the Handling (service notes)
task of releasing screwed joints secured with
adhesive (no stripping of threads in the The adhesive applied to the new screw is “spent”
component caused by using too much or the after its first use or after the screw has been
wrong adhesive). released.
Important: If a “used” screw is re-used, no screw
locking action is possible because the adhesive is
Construction
missing.
During the production process a carrier wax is
However, if securing the screwed joint with adhesive
applied to the surface of the thread. Embedded in is necessary or specified, the following options are
the wax are uniformly distributed micro-capsules available:
filled with liquid adhesive.
. Use new screws with microencapsulated
adhesive f
Function
When the screw is screwed into the component, the . re-use used screws. In this case a few turns of
micro-capsules are crushed so that the adhesive is the thread must be coated with LOCTITE 242
released and distributed evenly over the thread. A
certain period after the screw is tightened down, a
medium strength threadlocking adhesive prior
to installation.
complicated chemical process involving the wax
creates a solid joint. The specific properties of the
1.4 Summary
Item Part Name Previous New Remarks
Gearhead;
including items 1 to 5: 4128 640 0125 4128 640 0125 1)
1 Gear housing;
including item 3: 4128 641 0305 4128 641 0350 2)
2 Spline screw IS DG 5x12 (3x) 9075 478 4095 --- 3)
3 Spline screw IS M5x10 (3x) --- 9022 399 0950
4 Guard ring (for mowing) 4128 717 2700 4128 717 2701 2)
5 Guard ring (for sawing) 4128 717 2705 4128 717 2706 4)
Modification to be introduced: in progress
Remarks
1) Only modified version of part is available from factory
2) Previous version of part no longer available from factory
3) Previous version of part remains available for older machines
4) Previous version of part will be supplied from factory only as long as existing stocks last
Last Technical Information on models FS 220, 280: 31.96
Last Technical Bulletin on models FS 220, 280: 04.99 (Brazil only)
© 2000 Andreas Stihl AG & Co. Technical Documentation
Waiblingen D1/MTK-na 7075
TI_47_2000_01_01.fm Page 2 of 2
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