Bosch UniversalChain 18 Original Instructions Manual page 22

OBJ_BUCH-3472-001.book Page 22 Thursday, December 21, 2017 4:11 PM
22 | English
Tensioning the Saw Chain (see figure C)
Always check the chain tension before use, after the first cuts
and regularly during use approx. every 10 minutes. Upon
initial operation, new chains can lengthen considerably.
The chain life of the saw chain mainly depends upon sufficient
lubrication and correct tensioning.
Avoid tensioning the chain if it is hot, as this will cause the
chain to become overtensioned and face too tightly against
the chain bar when it cools down.
– Place the chain saw on any suitable flat surface.
– Turn clamping knob 14 approx. 1 – 3 turns anticlockwise
to loosen the chain bar.
– Check if the chain links are correctly located in the slot
around the chain bar 11 and on the drive sprocket 20.
– Turn the red chain-tensioning ring 13 clockwise ratcheting
until the correct chain tension is reached. The ratchet
mechanism prevents the chain tension from loosening. If
the chain-tensioning ring 13 is hard to turn, loosen the
clamping knob 14 further in anticlockwise direction. The
locking knob 14 may also turn, when adjusting the chain-
tensioning ring 13.
– The saw chain 12 is correctly tensioned when it can be
raised approx. 5–10 mm from the chain bar in the centre.
This should be done by using one hand to raise the saw
chain against the weight of the machine.
– If the saw chain 12 is overtensioned, turn the chain-
tensioning ring 13 in anticlockwise direction.
– When the saw chain 12 is tensioned, clamp the chain bar
11 by turning the locking knob 14 in clockwise direction.
Do not use a tool for this.
Saw-chain Lubrication (see figure D)
Note: The chain saw is not supplied filled with oil (delivery
scope). It is essential to fill with oil before use. Operating the
chain saw without chain oil or when the oil level is below the
minimum mark will result in damage to the chain saw.
Chain life and cutting capacity depend on optimum
lubrication. Therefore, the chain is automatically lubricated
with chain oil during operation via the oil outlet 21.
Filling the oil reservoir:
– Set chain saw on any suitable surface with the oil filler cap
4 facing upward.
– Clean area around the oil filler cap 4 with a cloth and
unscrew the cap.
– Add Bosch biodegradable chain saw oil until oil level reads
"max" on oil level gauge 7.
– Avoid dirt or debris from entering the oil reservoir. Screw
on oil filler cap 4 again and tighten.
– Run chainsaw for 30 seconds to "prime" oil system.
Note: To allow venting of the oil reservoir, small breather
channels are provided between the oil filler cap. To prevent
leakage ensure chain saw is left in a horizontal position (oil
filler cap 4 uppermost) when not in use.
F 016 L81 719 | (21.12.17)
Note: It is important to use only readily biodegradable chain
lubricants (according to RAL-UZ 48) to avoid damage to the
chain saw. Never use recycled/old oil. Use of non approved oil
will invalidate the warranty.
Note: Oil becomes denser at lower temperatures which
decreases the flow rate of oil.
Operation
Inserting the battery
Insert the charged battery 17. Ensure that the battery is
inserted correctly.
Switching On and Off
Hold the chain saw as described in section "Working with the
Chain Saw".
To start the machine, first push the lock-off button for the
On/Off switch 3 and then press the On/Off switch 2 and keep
it pressed.
When the machine is running, the lock-off button can be
released again.
To switch off the machine, release the On/Off switch 2.
Note: For safety reasons, the On/Off switch 2 cannot be
locked; it must remain pressed during the entire operation.
To save energy, only switch the power tool on when using it.
Working with the Chain Saw
Before Cutting
Before starting operation and periodically during cutting,
carry out the following checks:
– Is the chain saw in a safe condition?
– Is the oil reservoir filled? Check oil level gauge prior to
starting and regularly during operation. Refill oil when oil
level has reached the bottom edge of the viewing glass.
The oil tank filling will last approx. 15 minutes, depending
on sawing intensity and stops.
– Is the saw chain properly tensioned and sharp? Check
chain tension every 10 minutes during operation. Upon
initial operation, new chains can lengthen considerably.
The condition of the chain influences the cutting
performance. Only a sharp chain protects from overload.
– Are you wearing the required protective equipment? Wear
safety glasses and hearing protection. Further protective
equipment for head, hands, legs and feet is
recommended. Suitable protective clothing reduces the
danger of injury from thrown about cutting material and
accidental touching of the saw chain.
Kickback
Do not remove or modify the tip protector! Tool is fitted
with a tip protector to help protect against effect of kick back
by accidentally touching the tip of the tool against the wood.
Kickback is the sudden backward/upward motion of the chain
saw, occuring when the chain (at the tip of the chain bar)
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