Technical Information · issue 28 of 2000
3/8" Picco Mini
IssueTI 28/2000
Full text
Page 1 of 2
Technical Information
28.2000
STIHL 3/8” Oilomatic Picco Mini Saw Chain – Series 3982
1. New chain link geometry
1.1 Cutters
Compared to type 3987, the new cutters feature:
A
. Cutting edge (A) moved to rear
B
. Steeper top plate rake angle (B)
Benefits: Improved cutting efficiency
(about 6%) and better plunge-cutting
performance (57%)
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. More material on bottom (C) of cutters and tie
straps for improved wear resistance and longer
service life
C C
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1.2 Drive links
Drive links now have a constant thickness of 5,56 5,36
.043 in (1.1 mm) (D) compared to .050 in (1.3 mm)
(reduced to .043 in or 1.1 mm at bottom)
1.3 Cutting width
Reducing the drive link thickness by 0.2 mm (D)
automatically reduces the chain width and cutting
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width by 0.2 mm (3.6%).
D
Benefits:
. Less chip-removing work means that less drive Dimensions in millimeters
power is required Dark areas show new profile
. Higher cutting capacity without increasing
engine power
TI_28_2000_30_01.fm english / USA
)m~ge 2 Technical Information 28.2000
1.4 Oilomatic oil reservoir
Drive links have additional Oilomatic oil hole (E) for
. improved chain and bar lubrication
. reduced cutting attachment wear
The STIHL Oilomatic chain lubricating system with
the additional oil reservoir is described in detail in
TI 39.96.
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1.5 Service note Dark areas show new profile
Drive links and preset tie straps of the previous
(3987) and new (3982) chains must not be mixed
together. Similarly, avoid using previous and new
drive links in one and the same chain, even in
combination with the correct tie straps.
Previous (3987) and new (3982) cutters and tie
straps without rivets should not be mixed together.
Although mixing is physically possible, it may result
in problems.
1.6 Summary
Item Part Name Previous New Remarks
1 Right-hand cutter 3987 662 0400 3982 662 0400 1)
2 Left-hand cutter 3987 662 0600 3982 662 0600 1)
3 Drive link 3987 662 1000 3982 662 1000 1)
4 Preset tie strap 3987 660 6600 3982 660 6600 1)
5 Tie strap without rivet 3987 662 1200 3982 662 1200 1)
Modification to be introduced: in progress
Remarks
1) Previous version of part remains available for chain type 3987
Last Technical Information on STIHL saw chain: 54.1999
© 2000 Andreas STIHL AG & Co. Technical Documentation
Waiblingen D1/MTK 7018
TI_28_2000_30_01.fm Page 2 of 2
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