36 Chain and Bar Manual
3.19 Repairing Saw Chain
Owing to the relatively high chain
speed, any contact the chain and
particularly the cutters make with
hard materials (metal, stone etc.)
has a destructive effect on the chain
links concerned. Errors in
sharpening and incorrect chain
tension can also cause damage to
individual links. Chipped cutters and
faulty links must be replaced.
3.19.1 STIHL Rivet Spinners and
Chain Breakers
The STIHL NG 4 chain breaker,
STIHL NG 5 rivet spinner and
STIHL NG 7 chain breaker and rivet
spinner can be used for mobile
repairs but require a stable
mounting surface.
The stationary STIHL NG 3 chain
breaking and rivet spinning machine
is designed only for use in the repair
shop.
STIHL NG 7 chain breaker and rivet
spinner combination
3.19.2 Replacing Chain Links
Repairs are performed in
accordance with the operating
instructions supplied with the unit.
To ensure f l a w l ess opera ti o n o f a
repaired chain it is essential to
observe the following general rules:
–The assembly sequence of the
chain links must never be
changed.
–Rivets should always be formed
or spun so that the links move
freely with a minimum of play.
–The newly fitted chain link must
be matched to the other links: the
cutter and depth gauge must be
filed back to the size of the
master cutter and the bottom
faces filed back to match the
neighboring links.
A repair should never be attempted
without a suitable chain breaking
and rivet spinning tool. Improper
repairs can cause damage to the
new links and other parts of the
chain and this, in turn, can result in
chain breakage.
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