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Bosch GHO 12V-20 Professional Manual

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16 | English
Loosen the two fastening screws (21) using the hex key
(18) (approx. 1–2 turns).
If necessary, loosen the clamping element (20) by
lightly striking it with an appropriate implement, e.g. a
wooden wedge.
Push the side cutter block guard (8) downwards and
use a piece of wood to push the planer blade (17) to the
side and out of the blade head (19).
Fitting the planer blade (see figure B)
The guide groove on the planer blade ensures a constant,
even height setting when changing or turning the blade.
If necessary, clean the knife seat in the clamping element
(20) and the planer blade (17).
When fitting the planer blade, ensure that it is securely
seated in the mounting guide of the clamping element (20)
and is aligned flush with the side edge of the planer base
plate (9). Then tighten the two fastening screws (21) with
the hex key (18).
Note: Check that the fastening screws (21) are firmly
tightened before starting operation. Turn the blade head
(19) by hand and ensure that the planer blade is not brush-
ing against anything.
Note: A spare blade (17) can be placed in the drawer (7)
(see figure E).
Dust/chip extraction
The dust from materials such as lead paint, some types of
wood, minerals and metal can be harmful to human health.
Touching or breathing in this dust can trigger allergic reac-
tions and/or cause respiratory illnesses in the user or in
people in the near vicinity.
Certain dusts, such as oak or beech dust, are classified as
carcinogenic, especially in conjunction with wood treatment
additives (chromate, wood preservative). Materials contain-
ing asbestos may only be machined by specialists.
– Use a dust extraction system that is suitable for the ma-
terial wherever possible.
– Provide good ventilation at the workplace.
– It is advisable to wear a P2 filter class breathing mask.
The regulations on the material being machined that apply in
the country of use must be observed.
uAvoid dust accumulation at the workplace. Dust can
easily ignite.
Clean the chip ejector (13) regularly. Switch off the power
tool to do so. Remove the chip ejector and tap it to clear the
chips. Use a suitable tool, e.g. a piece of wood, compressed
air etc. to clean a blocked chip ejector.
uDo not allow the chip ejector to come into contact with
your hands. You may be injured by rotating parts.
Always use an external dust extraction device or chip/dust
bag to guarantee optimum suction.
External dust extraction (see figures C, G and H)
Remove the chip ejector (13).
The dust extraction adapter (24) (accessory) with dust ex-
traction hose (dia.35mm) (22) (accessory) can be fitted to
either side of the power tool.
Firstly, insert the dust extraction adapter (24) into the
power tool. Engage the lock (25) on the dust extraction ad-
apter. Then insert the dust extraction hose (22) into the
dust extraction adapter (24) until you hear both snap fasten-
ers (26) on the dust extraction hose engage.
Connect the dust extraction hose (22) to a dust extractor
(accessory). You will find an overview of how to connect to
various dust extractors at the end of these operating instruc-
tions.
The dust extractor must be suitable for the material being
worked.
When extracting dust that is dry, especially detrimental to
health or carcinogenic, use a special dust extractor.
Self-generated dust extraction (see figures C and I)
Remove the chip ejector (13).
You can use a chip/dust bag (accessory) (23) for small-scale
tasks.
Insert the chip/dust bag (23) into the power tool. Engage
the locking device (25) on the chip/dust bag.
Empty the chip/dust bag (23) at regular intervals to maintain
optimum dust collection.
Selectable chip ejector
Insert the chip ejector (13) into the right-hand or left-hand
side of the planer to determine the direction in which the
chips are ejected.
If the chip ejector (13) is not inserted, dust and chips are
ejected on both sides of the planer.
Operation
Note: The power tool can be operated using all Bosch 10.8 V
and 12 V batteries. We recommended using batteries with a
capacity of at least 2.5Ah for optimum power.
Operating modes
Setting the cutting depth
Note: The power tool is optimised for cutting depths of up to
1mm.
The cutting depth can be continuously adjusted from 0–1.0
mm using the knob (1). For cutting depths greater than 1
mm, the button (2) must be pressed:
Material Planing width
in mm Cutting depth
in mm
0–1.0 0–2.0
Softwood < 30 ● ●
30−40 ● −
Hardwood < 20 ● ●
20−30 ● −
Softwood (wet) 0−40 ● −
1 609 92A 4LD | (19.02.2019) Bosch Power Tools
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