Black & Decker GK1930T Manual page 9

Fit the chain cover knob (8) and tighten it finger tight.
Turn the thumbwheel (10) (fig. F) anti-clockwise until the
chain (5) is tight. Make sure that the chain (5) is snug
around the guide bar (6). Do not overtighten.
Tighten the chain cover knob (8).
Checking and adjusting the chain tension (fig. F & G)
Before use and after every 10 minutes of use, you must
check the chain tension.
Lightly pull on the chain (5) as shown (inset fig. G). The
tension is correct when the chain (5) snaps back after
being pulled 3 mm away from the guide bar (6). There
should be no "sag" between the guide bar (6) and chain
(5) on the underside
Note: Do not over-tension the chain (5) as this will lead to
excessive wear and will reduce the life of the guide bar (6)
and the chain (5).
Note: When the chain (5) is new, check the tension
frequently (after disconnecting from the mains) during the
first 2 hours of use as a new chain (5) stretches slightly.
To increase the tension:
Turn the thumbwheel (10) anti-clockwise.
Filling the oil reservoir (fig. F)
Remove the oil cap (3) and fill the reservoir with the
recommended chain oil. You can see the oil level in the
oil level indicator (11). Refit the oil cap (3).
Periodically switch off and check the oil level indicator
(11); if it is less than a quarter full, disconnect your
chainsaw from the mains and refill with the correct oil.
Auto-stop chain brake (fig. C)
This tool is fitted with an auto-stop chain brake
assembly (4) which will stop the chain (5) each time you
release the rear trigger, or if kickback should occur.The
chain brake assembly (4) should be tested before every
use.
How to set the chain brake (fig. C)
Make sure that the tool is disconnected from the mains
supply.
Pull the front guard/chain brake assembly (4) back into
the "set" position marked
The tool is now ready to use.
How the anti-kickback chain brake works
In the event of kickback, your left hand comes in contact with
the front guard, pushing it forwards, toward the workpiece,
and stops the tool within 150 ms.
(fig. C).
How the inertia activated chain brake works
The front guard/chain brake assembly (4) is activated when
the front hand guard is pushed forward, either manually, by
the back of the users hand or by its own weight. The
advantage of the inertia brake is that it is activated by a
severe kickback, e.g. When the chain (5) hits metal, even if
the users hand does not contact the front guard, i.e. when
the chainsaw is in the felling position.
How to test the anti-kickback chain brake (fig. C)
Always check that the kickback brake operates correctly
before use.
Grip the tool firmly in both hands on a firm surface make
sure the saw chain (5) is clear of the ground and switch
on (see" How to switch the chainsaw on").
Rotate your left hand forward around the front handle so
that the back of your hand comes in contact with the
front guard/chain brake assembly (4) and pushes it
forwards, toward the workpiece (fig. C). The saw chain
(5) should stop within a few fractions of a second
To reset after the operation of the front guard/chain brake
assembly (4):
Follow the instructions for "How to set the chain brake".
Note: It will not be possible to switch the tool on if the front
guard/chain brake assembly (4) is not in the "set"
position .
Note: Avoid re-starting the tool until you hear the motor
come to a complete rest.
Note: If the saw chain (5) does not come to rest immediately
then this indicates that it needs tensioning (see "Fitting the
guide bar and chain").
How to switch the tool on (fig. F)
Grip your chainsaw firmly with both hands. Push the
lock-off button (2) forward and then push the on/off
switch (1) to start.
When the motor starts, remove your thumb from the
lock button (2) and grip the handle firmly.
Do not force the tool - allow it to do the work.
It will do a better and safer job at the speed for which it is
designed. Excessive force will stretch the saw chain (5).
If the saw chain (5) or guide bar (6) becomes jammed:
Switch the tool off.
Disconnect the tool from the mains supply.
Open the cut with wedges to relieve the strain on the
guide bar (6). Do not try to wrench the chainsaw free.
Start a fresh cut.
ENGLISH
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