Technical Information · issue 6 of 2004

Tensioning Wrench; Setting Disc for Carburetor

IssueTI 6/2004

Full text

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STIH)

Technical Information 06.2004

STIHL Special Servicing Tools

Contents
1. Tensioning Wrench
2. Setting Disc for Carburetor

1. Tensioning Wrench 1.1 Application
The new tensioning wrench 5910 893 0300 is now
available for replacing the rewind spring and starter
rope.
The tensioning wrench simplifies tensioning and
releasing the tension of the rewind spring on the
more deeply recessed rope rotor of Series 4140 with
Easy2Start:
- FS 45 C
- FS 46 C
- FS 55 C
- KM 55 C
In conjunction with the Easy2Start conversion kit on:
- FC 55
- FS 38
901TI007 KN

- FS 45
- FS 55
Tensioning wrench 5910 893 0300
- HL 45
- KM 55

TI_06_2004_30_01_01.fm englisch / English USA
)m~ge 2 Technical Information 06.2004

1.2 Tensioning the Rewind Spring

901TI008 KN

901TI010 KN
. Engage starter rope in the notch in the rotor, and . Use the starter grip to pull out and straighten the
make a loop in the rope. twisted starter rope (arrow).
. Position the tensioning wrench on the rope rotor. . Keep the starter rope tensioned.
901TI009 KN

901TI014 KN
. Use the tensioning wrench to turn the rope rotor . Release the tensioning wrench and slowly let go
counterclockwise (seven turns on 4140, see on the rope (arrow) so that it winds onto the
service manual for other models) – making sure rotor.
the starter rope does not wind itself around the
The starter grip must locate firmly in the rope guide
tensioning wrench.
bushing. If the grip droops to one side: Add one
. Hold the tensioning wrench steady. more turn to increase spring tension.
When the starter rope is fully extended it must still
be possible to rotate the rotor at least another half
turn. If this is not the case, the spring is
overtensioned and might break. Take one turn off
the rotor.

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Technical Information 06.2004 Page 3

1.3 Releasing Tension of Rewind Spring 2. Setting Disc for Carburetor
Setting disc 5910 893 6600 is used together with
screwdriver 0000 890 2300 or 5910 890 2305 to
simplify carburetor adjustment.

2
901TI011 KN

4
10

6
8
. Position the tensioning wrench on the rope rotor.

901TI003 KN
. Use starter grip to pull out rope as far as stop.
. Hold the tensioning wrench steady to prevent
the rope rotor from rewinding. The setting disc has 16 divisions and a hole in the
middle for the screwdriver.

Using the Setting Disc

0 2
14

4
12
901TI012 KN

10 8

901TI004 KN
. Engage starter rope in the notch in the rotor.
. Use the tensioning wrench to slowly release
spring tension – the starter rope winds itself . Push the setting disc onto the screwdriver.
around the tensioning wrench until there is no
more tension.

TI_06_2004_30_01_01.fm
)m~ge 4 Technical Information 06.2004

1
14 0 14 0
12

12
2

2
10

10
4

4
8 6 8 6

901TI013 KN

901TI006 KN
. Engage the screwdriver in the adjusting screw. . Hold the setting disc steady.
. Carefully screw home the adjusting screw until it . Rotate the screwdriver counterclockwise until its
is firmly against its seat. lug (1) lines up with "0" on the scale – the
adjusting screw is now 7/8 turn open.

14 0
12

2
10

8 6
901TI005 KN

. Hold the screwdriver steady.
. Rotate the setting disc until the lug (1) on the
screwdriver is in line with the required setting
(e.g. 7/8 (14/16) turn).

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