Technical Information · issue 54 of 1999

STIHL 3/8”Oilomatic Picco-Micro Saw Chain: New cha

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Technical Information

                                                                                          54.1999
STIHL 3/8”Oilomatic Picco-Micro Saw Chain – Type 3997

1.     New chain link geometry

1.1    Cutters
Compared to type 3876, the new cutters are higher
overall (A) and feature:
.     2 mm (0.08”) longer top plate (D) for an
      increased wear life
.     steeper top plate rake angle (B) for higher
      cutting efficiency
.     shorter depth gauge (C) for better cutting
      performance
.     material added on bottom of cutter (E) for
      improved wear resistance

1.2    Drive links
The drive links are no longer “necked” (F). Benefits
are
.     improved drability
.     fatigue strength increased by 40%

1.3    Oilomatic oil reservoir
Drive links have additional Oilomatic oil hole (G) 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.

                                                            Dark area shows new profile

TI_54_1999_30_01.fm                                                                       english / USA
)m~ge 2                                                                       Technical Information 54.1999

1.4      Conclusion                                      1.5   Service note
The new chain link geometry offers the following         Component parts of the previous (3876) and new
improvements over the previous type 3876:                (3997) chains must not be mixed together. Although
                                                         mixing is physically possible, it may result in erratic
.       25% longer wear life
                                                         running behavior or faults.
.       16% higher cutting efficiency

1.6      Summary

Item         Part Name                             Previous               New                      Remarks
    1        Right-hand cutter                     3876 662 0400          3997 662 0400            1)
    2        Left-hand cutter                      3876 662 0600          3997 662 0600            1)
    3        Drive link                            3876 662 1000          3997 662 1000            1)
    4        Preset tie strap                      3876 660 6600          3997 660 6600            1)
    5        Tie strap without rivet               3876 662 1200          3997 662 1200            1)

Modification to be introduced: in progress
Remarks
1) Previous version of part remains available for chain type 3876

Last Technical Information on STIHL saw chain: 08.1999

© 1999 Andreas STIHL AG & Co.                            Technical Documentation
  Waiblingen                                             D1/MTK                                            6731

                                                                                            TI_54_1999_30_01.fm

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