hecht 925 R - Page 23

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16. Gas (acceleration) lever
17. Rear hand guard
18. Safety and type labels
19. Injector/primer (if installed)
20. Clutch cover
21. Chain trap
22. Clutch cover nuts
23. Chain tensioning screw
CHAIN
consists of connecting, guide, cutting links.
It is important for you to know only the width of the guide link (usually given in millimetres),
the number of links, their spacing and the grinding angles of the cutting link. The cutting links
are placed on the chain behind one another, always the left, right, etc.
- link spacing (given in inches or fraction, e.g. 3/8; 0,325) is the distance of three
consecutive rivets divided by two (because the rivets are not distributed identically on
the chain)
- width of guide link (usually given in millimetres 1,2mm; 1,5 mm) – must be the same as
the width of the guide bar groove
- number of links is the number of cutting links on the chain - it specifies its length. (e.
g. 66)
- For grinding angles, see CHAIN GRINDING
HECHT chains are identified by a single six-digit code based on which the chain type can be easily
identified. The first three characters indicate the spacing and width of the groove. 25Q means
0.325 spacing and 1.5mm groove; 33E means 3/8 spacing and 1.5mm groove; 48Y means 3/
spacing and 1.3mm groove. The last three characters determine the number of chain links.
BAR
Bargroove
Motor mount
Nose-sprocket grease hole
Bar length
Sprocket wheel
Bar parameters:
- Length of chainsaw bar is the length of the active part of the bar (usually given in inches
14"/355 mm)
- Width of the guide groove and chain spacing/splitting (same as for chain parameters)
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