Bosch GGS Professional 8 CE, GGS Professional 28 C, GGS Professional 28 CE, GGS Professional 28 LC, GGS Professional 28 LCE User Manual

OBJ_DOKU-22619-004.fm Page 1 Tuesday, May 17, 2011 4:13 PM

Robert Bosch GmbH

Power Tools Division
70745 Leinfelden-Echterdingen
Germany

www.bosch-pt.com

3 609 929 C06 (2011.05) O / 197 UNI

GGS Professional

8 CE | 28 C | 28 CE | 28 LC | 28 LCE

de Originalbetriebsanleitung
en Original instructions
fr Notice originale
es Manual original
pt Manual original
it Istruzioni originali
nl Oorspronkelijke

gebruiksaanwijzing

da Original brugsanvisning
sv Bruksanvisning i original
no Original driftsinstruks
fi Alkuperäiset ohjeet

el Рсщфьфхрп пдзгйюн чсЮузт

tr Orijinal işletme talimat

pl Instrukcja oryginalna
cs Původní návod k používání
sk Pôvodný návod na použitie
hu Eredeti használati utasítás

ru Оригинальное руководство по

эксплуатации

uk Ориг³нальна ³нструкц³я з

експлуатац³¿

ro Instrucţiuni originale

bg Оригинална инструкция

sr Originalno uputstvo za rad
sl Izvirna navodila
hr Originalne upute za rad

et Algupärane kasutusjuhend
lv Instrukcijas oriģinālvalodā
lt Originali instrukcija

ar
fa

Ϡλ΍ έΎ ίήσ ΎϤϨϫ΍έ

ΕΎϤϴϠόΗϞϴϐθΘϟ΍ΔϴϠλϷ΍

OBJ_BUCH-1269-004.book Page 3 Tuesday, May 17, 2011 4:15 PM

3 |

GGS 8 CE

GGS 28 LC

GGS 28 LCE

Professional

6

5

2 4

13

GGS 28 C
GGS 28 CE
Professional

A

3 609 929 C06 | (17.5.11) Bosch Power Tools

8

2

3
9

7

OBJ_BUCH-1269-004.book Page 10 Tuesday, May 17, 2011 4:15 PM

10 | English

Position Stellrad Leerlaufdrehzahl (min-1)

GGS 28 CE
GGS 28 LCE

1 10000 250 0
2
3
4
5
6

12700 360 0
16700 460 0
19700 570 0
23500 680 0
28000 800 0

GGS 8 CE

Arbeitshinweise

Bewegen Sie den Schleifkörper mit leichtem Druck gleichmä­ßig hin und her, um ein optimales Arbeitsergebnis zu erhalten.
Zu starker Druck verringert die Leistungsfähigkeit des Elek­trowerkzeuges und führt zu schnellerem Verschleiß des
Schleifkörpers.

Wartung und Service

Wartung und Reinigung

f Ziehen Sie vor allen Arbeiten am Elektrowerkzeug den

Netzstecker aus der Steckdose.

f Halten Sie das Elektrowerkzeug und die Lüftungsschlit-

ze sauber, um gut und sicher zu arbeiten.

f Verwenden Sie bei extremen Einsatzbedingungen nach

Möglichkeit immer eine Absauganlage. Blasen Sie die
Lüftungsschlitze häufig aus und schalten Sie einen Feh­lerstrom-(FI-)Schutzschalter vor. Bei der Bearbeitung

von Metallen kann sich leitfähiger Staub im Innern des
Elektrowerkzeugs absetzen. Die Schutzisolierung des
Elektrowerkzeugs kann beeinträchtigt werden.

Sollte das Elektrowerkzeug trotz sorgfältiger Herstellungs­und Prüfverfahren einmal ausfallen, ist die Reparatur von ei­ner autorisierten Kundendienststelle für Bosch-Elektrowerk­zeuge ausführen zu lassen.

Geben Sie bei allen Rückfragen und Ersatzteilbestellungen
bitte unbedingt die 10-stellige Sachnummer laut Typenschild
des Elektrowerkzeuges an.

Kundendienst und Kundenberatung

Der Kundendienst beantwortet Ihre Fragen zu R eparatur und
Wartung Ihres Produkts sowie zu Ersatzteilen. Explosions­zeichnungen und Informationen zu Ersatzteilen finden Sie
auch unter:

www.bosch-pt.com

Das Bosch-Kundenberater-Team hilft Ihnen gerne bei Fragen
zu Kauf, Anwendung und Einstellung von Produkten und Zu­behören.

www.powertool-portal.de, das Internetportal für Handwer­ker und Heimwerker.
www.ewbc.de, der Informations-Pool für Handwerk und Aus­bildung.

Deutschland

Robert Bosch GmbH
Servicezentrum Elektrowerkzeuge
Zur Luhne 2
37589 Kalefeld – Willershausen
Tel. Kundendienst: [phone]*
Fax: [phone]*
(*Festnetzpreis 14 ct/min, höchstens 42 ct/min aus Mobil­funknetzen)
E-Mail: [e-mail]
Tel. Kundenberatung: [phone]
(Festnetzpreis 9 ct/min, höchstens 42 ct/min aus Mobilfunk­netzen)
Fax: [phone]
E-Mail: [e-mail]

Österreich

Tel.: [phone]
Fax: [phone]
E-Mail: [e-mail]

Schweiz

Tel.: [phone]
Fax: [phone]

Luxemburg

Tel.: [phone]
Fax: [phone]
E-Mail: [e-mail]

Entsorgung

Elektrowerkzeuge, Zubehör und Verpackungen sollen einer
umweltgerechten Wiederverwertung zugeführt werden.

Werfen Sie Elektrowerkzeuge nicht in den Hausmüll!

Nur für EU-Länder:

Änderungen vorbehalten.

English

Safety Notes

General Power Tool Safety Warnings

structions may result in electric shock, fire and/or serious injury.

Save all warnings and instructions for future reference.

The term “power tool” in the warnings refers to your mains­operated (corded) power tool or battery-opera ted (cordless)
power tool.

WARNING

Gemäß der Europäischen Richtlinie
2002/96/EG über Elektro- und Elektronik­Altgeräte und ihrer Umsetzung in nationales
Recht müssen nicht mehr gebrauchsfähige
Elektrowerkzeuge getrennt gesa mmelt und
einer umweltgerechten Wiederverwertung
zugeführt werden.

Read all safety warnings a nd all instruc­tions. Failure to follow the warnings and in-

3 609 929 C06 | (17.5.11) Bosch Power Tools

OBJ_BUCH-1269-004.book Page 11 Tuesday, May 17, 2011 4:15 PM

Work area safety

f Dress properly. Do not wear loose clothing or jewel-

f Keep work area clean and well lit. Cluttered or dark areas

invite accidents.

f Do not operate power tools in explosive atmospheres,

such as in the presence of flammable liquids, gases or

f If devices are provided for the connection of dust ex-

dust. Power tools create sparks which may ignite the dust

or fumes.

f Keep children and bystanders away while operating a

power tool. Distractions can cause you to lose control.

Electrical safety

Power tool use and care

f Do not force the power tool. Use the correct power tool

f Power tool plugs must match the outlet. Never modify

the plug in any way. Do not use any adapter plugs with
earthed (grounded) power tools. Unmodified plugs and

f Do not use the power tool if the switch does not turn it

matching outlets will reduce risk of electric shock.

f Avoid body contact with earthed or grounded surfaces,

such as pipes, radiators, ranges and refrigerators.

f Disconnect the plug from the power source and/or the

There is an increased risk of electric shock if your body is
earthed or grounded.

f Do not expose power tools to rain or wet conditions.

Water entering a power tool will increase the risk of electric
shock.

f Stor

f Do not abuse the cord. Never use the cord for carrying,

pulling or unplugging the power tool. Keep cord away
from heat, oil, sharp edges and moving parts. Damaged

or entangled cords increase the risk of electric shock.

f Maintain power tools. Check for misalignment or bind-

f When operating a power tool outdoors, use an exten-

sion cord suitable for outdoor use. Use of a cord suitable
for outdoor use reduces the risk of electric shock.

f If operating a power tool in a damp location is unavoid-

able, use a residual current device (RCD) protected
supply. Use of an RCD reduces the risk of electric shock.

f Keep cutting tools sharp and clean. Properly maintained

Personal safety
f Stay alert, watch what you are doing and use common

sense when operating a power tool. Do not use a power

f Use the power tool, accessories and tool bits etc. in ac-

tool while you are tired or under the influence of drugs,
alcohol or medication. A moment of inattention while op-

erating power tools may result in serious personal injury.

f Use personal protective equipment. Always wear eye

protection. Protective equipment such as dust mask,

non-skid safety shoes, hard hat, or hearing protection

Service
f Have your power tool serviced by a qualified repair per-

used for appropriate conditions will reduce personal inju­ries.

f Prevent unintentional starting. Ensure the switch is in

the off-position before connecting to power source
and/or battery pack, picking up or carrying the tool.

Carrying power tools with your finger on the switch or en­ergising power tools that have the switch on invites acci-

Safety Warnings for Straight Grinders

Safety Warnings Common for Grinding, Wire Brushing,
Polishing or Carving:

f This power tool is intended to function as a grinder,

dents.

f Remove any adjusting key or wrench before turning

the power tool on. A wrench or a key left attached to a ro-

tating part of the power tool may result in personal injury.

f Do not overreach. Keep proper footing and balance at

all times. This enables better control of the power tool in

f Do not use accessories which are not specifically de-

unexpected situations.

English | 11

lery. Keep your hair, clothing and gloves away from
moving parts. Loose clothes, jewellery or long hair can be

caught in moving parts.

traction and collection facilities, ensure these are con­nected and properly used. Use of dust collection can re-

duce dust-related hazards.

for your application. The correct power tool will do the
job better and safer at the rate for which it was designed.

on and off. Any power tool that cannot be controlled with
the switch is dangerous and must be repaired.

battery pack from the power tool before making any
adjustments, changing accessories, or storing power
tools. Such preventive safety measures reduce the risk of

starting the power tool accidentally.

e idle power tools out of the reach of children and

do not allow persons

unfamiliar with the power tool or

these instructions to operate the power tool. Power

tools are dangerous in the hands of untrained users.

ing of moving parts, breakage of parts and any other
condition that may affect the power tool’s operation. If
damaged, have the power tool repaired before use.

Many accidents are caused by poorly maintained power
tools.

cutting tools with sharp cutting edges are less likely to bind
and are easier to control.

cordance with these instructions, taking into account
the working conditions and the work to be performed.

Use of the power tool for operations different from those
intended could result in a hazardous situation.

son using only identical replacement parts. This will en­sure that the safety of the power tool is maintained.

carving tool, polisher (GGS 8 CE) or wire brush
(GGS 8 CE). Read all safety warnings, instructions, il­lustrations and specifications provided with this power
tool. Failure to follow all instructions listed below may re-

sult in electric shock, fire and/or serious injury.

signed and recommended by the tool manufacturer.

Just because the accessory can be attached to your power
tool, it does not assure safe operation.

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12 | English

f The rated speed of the accessory must be at least equal

to the maximum speed marked on the power tool. Ac-

cessories running faster than their rated speed can break
and fly apart.

f The outside diameter and the thickness of your acces-

sory must be within the capacity rating of your power
tool. Incorrectly sized accessories cannot be adequately

controlled.

f The arbour size of wheels, sanding drum or any other

accessory must properly fit the spindle or collet of the
power tool. Accessories that do not match the mounting

hardware of the power tool will run out of balance, vibrate
excessively and may cause loss of control.

f Mandrel mounted wheels, sanding drums, cutters or

other accessories must be fully inserted into the collet
or chuck. The “overhang” or the length of the mandrel
from the wheel to the collet must be minimal. If the man-

drel is insufficiently held and/or the overhang of the wheel
is too long, the mounted wheel may become loose and
ejected at high velocity.

f Do not use a damaged accessory. Before each use in-

spect the accessory such as abrasive wheels for chips
and cracks, sanding drum for cracks, tear or excess
wear, wire brush for loose or cracked wires. If power
tool or accessory is dropped, inspect for damage or in­stall an undamaged accessory. After inspecting and in­stalling an accessory, position yourself and bystanders
away from the plane of the rotating accessory and run
the power tool at maximum no-load speed for one
minute. Damaged accessories will normally break apart

during this test time.

f Wear personal protective equipment. Depending on

application, use face shield, safety goggles or safety
glasses. As appropriate, wear dust mask, hearing pro­tectors, gloves and workshop apron capable of stop­ping small abrasive or workpiece fragments. The eye

protection must be capable of stopping flying debris gen­erated by various operations. The dust mask or respirator
must be capable of filtrating particles generated by your
operation. Prolonged exposure to high intensity noise may
cause hearing loss.

f Keep bystanders a safe distance away from work area.

Anyone entering the work area must wear personal
protective equipment. Fragments of workpiece or of a

broken accessory may fly away and cause injury beyond
immediate area of operation.

f Hold power tool by insulated gripping surfaces only,

when performing an operation where the cutting ac­cessory may contact hidden wiring or its own cord. Cut-

ting accessory contacting a “live” wire may make exposed
metal parts of the power tool “live” and could give the op­erator an electric shock.

f Always hold the tool firmly during the start-up. The re-

action torque of the motor, as it accelerates to full speed,
can cause the tool to twist.

f Use clamps to support workpiece whenever practical.

Never hold a small workpiece in one hand and the tool

piece allows you to use both hands to control the tool.
Round material such as dowel rods, pipes or tubing have a
tendency to roll while being cut, and may cause the bit to
bind or jump toward you.

f Position the cord clear of the spinning accessory. If you

lose control of the power tool, the cord may be cut or
snagged and your hand or arm may be pulled into the spin­ning accessory.

f Never lay the power tool down until the accessory has

come to a complete stop. The spinning accessory may

grab the surface and pull the power tool out of your control.

f After changing the bits or making any adjustments,

make sure the collet nut, chuck or any other adjust­ment devices are securely tightened. Loose ad

justme
devices can unexpectedly shift, causing loss of control,
loose rotating components will be violently thrown.

f Do not run the power tool while carrying it at your side.

Accidental contact with the spinning accessory could snag
your clothing, pulling the accessory into your body.

f Regularly clean the power tool’s air vents. The motor’s

fan will draw the dust inside the housing and excessive ac­cumulation of powdered metal may cause electrical haz­ards.

f Do not operate the power tool near flammable materi-

als. Sparks could ignite these materials.

f Do not use accessories that require liquid coolants. Us-

ing water or other liquid coolants may result in electrocu­tion or shock.

Kickback and related warnings

f Kickback is a sudden reaction to a pinched or snagged ro-

tating wheel, backing pad, brush or any other accessory.
Pinching or snagging causes rapid stalling of the rotating
accessory which in turn causes the uncontrolled power
tool to be forced in the direction opposite of the accesso­ry’s rotation at the point of the binding.
For example, if an abrasive wheel is snagged or pinche d by
the workpiece, the edge of the wheel that is entering into
the pinch point can dig into the surface of the material
causing the wheel to climb out or kick out. The wheel may
either jump toward or away from the operator, de pending
on direction of the wheel’s movement at the point of pinch­ing. Abrasive wheels may also break under these condi­tions.
Kickback is the result of power tool misuse and/or incor­rect operating procedures or conditions and can be avoid­ed by taking proper precautions as given below.

f Maintain a firm grip on the power tool and position your

body and arm to allow you to resist kickback forces.

The operator can control kickback forces, if proper precau­tions are taken.

f Use special care when working corners, sharp edges,

etc. Avoid bouncing and snagging the accessory. Cor-

ners, sharp edges or bouncing have a tendency to snag the
rotating accessory and cause loss of control or kickback.

f Do not attach a thin toothed saw blade. Such blades cre-

ate frequent kickback and loss of control.

in the other hand while in use. Clamping a small work-

3 609 929 C06 | (17.5.11) Bosch Power Tools

nt

OBJ_BUCH-1269-004.book Page 13 Tuesday, May 17, 2011 4:15 PM

f Always feed the bit into the material in the same direc-

tion as the cutting edge is exiting from the material
(which is the same direction as the chips are thrown).

Feeding the tool in the wrong direction causes the cutting

Safety warnings specific for polishing operations
(GGS 8 CE)

f Do not allow any loose portion of the polishing bonnet

edge of the bit to climb out of the work and pull the tool in
the direction of this feed.

f When using cut-off wheels, high-speed cutters or tung-

sten carbide cutters, always have the work securely
clamped. These wheels will grab if they become slightly

canted in the groove, and can kickback. When a cut-off
wheel grabs, the wheel itself usually breaks. When the

Safety warnings specific for wire brushing operations
(GGS 8 CE)

f Be aware that wire bristles are thrown by the brush

steel saw, high-speed cutters or tungsten carbide cutter
grab, it may jump from the groove and you could lose con­trol of the tool.

Additional safety instructions for grinding

f Allow brushes to run at operating speed for at least one

f Use only wheel types that are recommended for your

power tool and only for recommended applications.
For example: do not grind with the side of a cut-off
wheel. Abrasive cut-off wheels are intended for peripheral

f Direct the discharge of the spinning wire brush away

grinding, side forces applied to these wheels may cause
them to shatter.

f For threaded abrasive cones and plugs use only undam-

aged wheel mandrels with an unrelieved shoulder

Additional safety warnings

flange that are of correct size and length. Proper man-

drels will reduce the possibility of breakage.

f Do not “jam” the cut-off wheel or apply excessive pres-

sure. Do not attempt to make an excessive depth of cut.

Overstressing the wheel increases the loading and suscep­tibility to twisting or binding of the wheel in the cut and the
possibility of kickback or wheel breakage.

f Use suitable detectors to determine if utility lines are

f Do not position your hand in line with and behind the

rotating wheel. When the wheel, at the point of operation,
is moving away from your hand, the possible kickback may
propel the spinning wheel and the power tool directly at
you.

f When wheel is binding or when interrupting a cut for

f Release the On/Off switch and set it to the off position

any reason, switch off the power tool and hold the pow­er tool motionless until the wheel comes to a complete
stop. Never attempt to remove the cut-off wheel from
the cut while the wheel is in motion otherwise kickback

f Secure the workpiece. A workpiece clamped with clamp-

may occur. Investigate and take corrective action to elimi-

nate the cause of wheel binding.

f Do not restart the cutting operation in the workpiece.

Let the wheel reach full speed and carefully re-enter
the cut. The wheel may bind, walk up or kickback if the

power tool is restarted in the workpiece.

f Support panels or any oversized workpiece to minimize

the risk of wheel pinching and kickback. Large work-

pieces tend to sag under their own weight. Supports must
be placed under the workpiece near the line of cut and ne ar
the edge of the workpiece on both sides of the wheel.

f Use extra caution when making a “pocket cut” into ex-

isting walls or other blind areas. The protruding wheel

Products sold in GB only: Your product is fitted with a

BS 1363/A approved electric plug with internal fuse (ASTA
approved to BS 1362).
If the plug is not suitable for your socket outlets, it should be
cut off and an appropriate plug fitted in its place by an author­ised customer service agent. The replacement plug should
have the same fuse rating as the original plug.
The severed plug must be disposed of to avoid a possible
shock hazard and should never be inserted into a mains sock­et elsewhere.
Products sold in AUS and NZ only: Use a residual current de­vice (RCD) with a rated residual current of 30 mA or less.

may cut gas or water pipes, electrical wiring or objects that
can cause kickback.

English | 13

or its attachment strings to spin freely. Tuck away or
trim any loose attachment strings. Loose and spinning

attachment strings can entangle your fingers or snag on the
workpiece.

even during ordinary operation. Do not overstress the
wires by applying excessive load to the brush. The wire

bristles can easily penetrate light clothing and/or skin.

minute before using them. During this time no one is to
stand in front or in line with the brush. Loose bristles or

wires will be discharged during the run-in time.

from you. Small particles and tiny wire fragments may be
discharged at high velocity duri ng the use of these brushes
and may become imbedded in your skin.

Wear safety goggles.

hidden in the work area or call the local utility company
for assistance. Contact with electric lines can lead to fire

and electric shock. Damaging a gas line can lead to explo­sion. Penetrating a water line causes property damage or
may cause an electric shock.

when the power supply is interrupted, e. g., in case of a
power failure or when the mains plug is pulled. This pre-

vents uncontrolled restarting.

ing devices or in a vice is held more secure than by hand.

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14 | English

Product Description and Specifica­tions

Read all safety warnings and all instruc­tions. Failure to follow the warnings and in-

structions may result in electric shock, fire
and/or serious injury.

While reading the operating instructions, unfold the graphics
page for the machine and leave it open.

Intended Use

The machine is designed for grinding and deburring metal us­ing corundum grinding tools, as well as for working with sand­ing wheels.

GGS 8 CE: The machine is additionally intended for brushing
and polishing metal.

Product Features

The numbering of the product features refers to the illustra­tion of the machine on the graphics page.

1 Collet chuck
2 Clamping nut
3 Grinder spindle
4 Spindle collar
5 On/Off switch
6 Thumbwheel for speed preselection

(GGS8CE/GGS28CE/GGS28LCE)

7 Handle (insulated gripping surface)
8 Open-end spanner on the grinder spindle *
9 Open-end spanner applied to clamping nut *

*Accesso ries shown or described are not part of the standard de­livery scope of the product. A complete overview of accessories
can be found in our accessories program.

Technical Data

Straight grinder GGS ...

Professional

Article number 3 601 ... B22 1.. B20 0.. B20 1.. B21 0.. B21 1..
Rated power input
Output power
Rated speed
Speed control adjustment

Collet chuck diameter, max.
Spanner size of

–clamping nut
– grinder spindle

Spindle collar dia. mm 43 43 43 43 43
Grinding tool diameter, max.
Polishing tool diameter, max.
Constant electronic control
Speed preselection
Weight according to EPTA-Procedure 01/2003
Protection class

The values given are valid for a nominal voltage [U] of 230 V. For different voltages and models for specific countries, these values can vary.
Please observe the article number on the type plate of your machine. The trade names of the individual machines may vary.

8 CE 28 C 28 CE 28 LC 28 LCE

W750600 650 650 650

W420350 380 380 380
min-18000 28 000 28 000 28 000 28000
min-12500

–8000

mm 8 8888

mmmm19

13

mm 50 50 50 50 50
mm 80 ––––

z zzzz
z – z – z

kg 1.7 1.4 1.4 1.6 1.6

/II /II / II /II / II

10000

–

– 28000 –

19
19

191919

1000 0

–28000

13

Noise/Vibration Information

Measured sound values determined according to EN 60745.

GGS ...
Professional

Typically the A-weighted noise levels of the product are
Sound pressure level
Sound power level
Uncertainty K=

Wear hearing protection!

dB(A)
dB(A)

dB

28 C

28 CE

78
89

28 LC

28 LCE

77
88

3

3

19
13

8 CE

82
93

3

3 609 929 C06 | (17.5.11) Bosch Power Tools

OBJ_BUCH-1269-004.book Page 15 Tuesday, May 17, 2011 4:15 PM

English | 15

GGS ...
Professional

Vibration total values a
EN 60745:

(triax vector sum) and uncertainty K determined according to

h

Surface grinding (with wheel diameter of 25 mm):
a

h

K
Vibration total values ah (triax vector sum) and uncertainty K determined according to

EN 60745:
Surface grinding (with wheel diameter of 50 mm (max.):
a

h

K

The vibration emission level given in this information sheet
has been measured in accordance with a standardised test
given in EN 60745 and may be used to compare one tool with
another. It may be used for a preliminary assessment of expo­sure.
The declared vibration emission level represents the main ap­plications of the tool. However if the tool is used for different
applications, with different accessories or poorly main tained,
the vibration emission may differ. This may significantly in­crease the exposure level over the total working period.
An estimation of the level of exposure to vibration should also
take into account the times when the tool is switched off or
when it is running but not actually doing the job. This may signif­icantly reduce the exposure level over the total working period.
Identify additional safety measures to protect the operator
from the effects of vibration such as: maintain the tool and the
accessories, keep the hands warm, organisation of work pat­terns.

Declaration of Conformity

We declare under our sole responsibility that the product de­scribed under “Technical Data” is in conformity with the fol­lowing standards or standardization documents: EN 60745
according to the provisions of the directives 2004/108/EC,
2006/42/EC.

Technical file at:
Robert Bosch GmbH, Postfach 10 01 56,
D-70745 Leinfelden-Echterdingen

Dr. Egbert Schneider
Senior Vice President
Engineering

Dr. Eckerhard Strötgen
Head of Product
Certification

– Clean the grinder spindle 3 and all parts to be mounted.
– Hold the grinder spindle 3 with open-end spanner 8 by the

spanner flats .
Loosen the clamping nut 2 with open-end spa nner 9 by ap­plying it to the spanner flats and turning in anticlockwise
direction.

– Insert the clamping shaft of the grinding tool to the stop in-

to the collet chuck 1.

– Hold the grinder spindle 3 firmly with open-end spanner 8

and clamp the tool bit with open-end spanner 9 by the
spanner flats, turning in clockwise direction.

The grinding tools must run completely concentrical. Do not
continue to use out-of-round grinding accessories, instead,
replace before continuing to work.

f Do not tighten the collet chuck of the clamping nut as

long as no grinding accessory is mounted. Otherwise,

the collet chuck can become damaged.

Dust/Chip Extraction

f Dusts from materials such as lead-containing coatings,

some wood types, minerals and metal can be harmful to
one’s health. Touching or breathing-in the dusts can cause
allergic reactions and/or lead to respiratory infections of
the user or bystanders.
Certain dusts, such as oak or beech dust, are considered
as carcinogenic, especially in connection with wood-treat­ment additives (chromate, wood preservative). Materials
containing asbestos may only be worked by specialists.

– Provide for good ventilation of the working place.
– It is recommended to wear a P2 filter-class respirator.

Observe the relevant regulations in your country for the
materials to be worked.

f Prevent dust accumulation at the workplace. Dusts can

easily ignite.

Robert Bosch GmbH, Power Tools Division
D-70745 Leinfelden-Echterdingen

18.04.2011

Operation

Starting Operation

Assembly

f Before any work on the machine itself, pull the mains plug.

Mounting the Grinding Tools (see figure A)

f Only use properly fitting and undamaged open-end

spanners (see “Technical Data”).

f Observe correct mains voltage! The voltage of the pow-

er source must agree with the voltage specified on the
nameplate of the machine. Power tools marked with
230 V can also be operated with 220 V.

Switching On and Off

To start the power tool, push the On/Off switch 5 forwards.

m/s
m/s

m/s
m/s

28 C

28 LC

1.5

14

1.5

8 CE

6

≤2.5

1.5

≤2.5

1.5

28 CE

28 LCE

2

3

2

1.5

2

8

2

1.5

Bosch Power Tools 3 609 929 C06 | (17.5.11)

OBJ_BUCH-1269-004.book Page 16 Tuesday, May 17, 2011 4:15 PM

16 | English

To lock the On/Off switch 5, press the On/Off switch 5 down
at the front until it latches.

To switch off the power tool, release the On/Off switch 5 or,
if it is locked, briefly push down the back of the On/Off switch

5 and then release it.
Kickback stop

In case of a sudden drop in speed, e.g., caused by a jammed
disc while cutting, the power supply to the motor is elec troni­cally interrupted.

To restart the operation, switch the On/Off switch 5 to the
Off position and start the machine again.

Constant Electronic Control

Constant electronic control holds the speed constant at no­load and under load, and ensures uniform working perform­ance.

Speed preselection (GGS 8 CE/GGS 28 CE /GGS 28 LCE)

The required speed can be preselected with the thumbwheel
6 (also while running).

The required speed depends on the material being worked
and the diameter of the application tool. Observe the maximal
allowable speed of the application tool.

Thumbwheel Position No-load speed (min-1)

GGS 28 CE
GGS 28 LCE

1
2
3
4
5
6

10000 25 00
12700 36 00
16700 46 00
19700 57 00
23500 68 00
28000 80 00

GGS 8 CE

Working Advice

Optimum grinding results are achieved when the grinding tool
is moved uniformly back and forth with light pressure. Pres­sure that is too strong reduces the performance capability of
the machine and causes the grinding tool to wear more quick­ly.

Maintenance and Service

Maintenance and Cleaning

f Before any work on the machine itself, pull the mains

plug.

f For safe and proper working, always keep the machine

and ventilation slots clean.

f In extreme conditions, always use dust extraction as

far as possible. Blow out ventilation slots frequently
and install a residual current device (RCD). When work-

ing metals, conductive dust can settle in the interior of the
power tool. The total insul ation of the power tool can be im­paired.

If the machine should fail despite the care taken in manufac­turing and testing procedures, repair should be carried out by
an after-sales service centre for Bosch power tools.

3 609 929 C06 | (17.5.11) Bosch Power Tools

In all correspondence and spare parts order, please always in­clude the 10-digit article number given on the type plate of
the machine.

After-sales Service and Customer Assistance

Our after-sales service responds to your questions concern­ing maintenance and repair of your product as well as spare
parts. Exploded views and information on spare parts can al­so be found under:

www.bosch-pt.com

Our customer service representatives can answer your ques­tions concerning possible applications and adjustment of
products and accessories.

Great Britain

Robert Bosch Ltd. (B.S.C.)
P.O. Box 98
Broadwater Park
North Orbital Road
Denham
Uxbridge
UB 9 5HJ
Tel. Service: [phone]
Fax: [phone]
E-Mail: [e-mail]

Ireland

Origo Ltd.
Unit 23 Magna Drive
Magna Business Park
City West
Dublin 24
Tel. Service: [phone]
Fax: [phone]

Australia, New Zealand and Pacific Islands

Robert Bosch Australia Pty. Ltd.
Power Tools
Locked Bag 66
Clayton South VIC 3169
Customer Contact Center
Inside Australia:
Phone: [phone]
Fax: [phone]
Inside New Zealand:
Phone: [phone]
Fax: [phone]
Outside AU and NZ:
Phone: [phone]
www.bosch.com.au

Republic of South Africa
Customer service

Hotline: [phone]

Gauteng – BSC Service Centre

35 Roper Street, New Centre
Johannesburg
Tel.: [phone]
Fax: [phone]
E-Mail: [e-mail]