Bosch Power Tools GP712VS User Manual
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IMPORTANT: IMPORTANT : IMPORTANTE:
Read Before Using Lire avant usage Leer antes de usar
Operating/Safety Instructions
Consignes de fonctionnement/sécurité
Instrucciones de funcionamiento y seguridad
GP712VS
Call Toll Free for
Consumer Information
& Service Locations
Pour obtenir des informations
et les adresses de nos centres
de service après-vente,
appelez ce numéro gratuit
Llame gratis para
obtener información
para el consumidor y
ubicaciones de servicio
1-877-BOSCH99 (1-877-267-2499) www.boschtools.com
For English Version Version française Versión en español
See page 2 Voir page 14 Ver la página 26
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General Power Tool Safety Warnings
WARNING
!
Read all safety warnings and all instructions. Failure to follow the warnings
and instructions 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 mains-operated (corded) power tool or
battery-operated (cordless) power tool.
Work area safety
Keep work area clean and well lit. Cluttered
or dark areas invite accidents.
Do not operate power tools in explosive
atmospheres, such as in the presence of
flammable liquids, gases or dust. Power
tools create sparks which may ignite the dust
or fumes.
Keep children and bystanders away while
operating a power tool. Distractions can
cause you to lose control.
Electrical safety
Power tool plugs must match the outlet.
Never modify the plug in any way. Do not
us e a ny adapter pl ug s with earthe d
(grounded) power tools. Unmodified plugs
and matching outlets will reduce risk of electric
shock.
Avoid body contact with earthed or grounded
surfaces such as pipes, radiators, ranges
and refrigerators. There is an increased risk
of electric shock if your body is earthed or
grounded.
Do not expose power tools to rain or wet
conditions. Water entering a power tool will
increase the risk of electric shock.
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 or moving parts. Damaged or entangled
cords increase the risk of electric shock.
When operating a power tool outdoors,
use an extension cord suitable for outdoor
use. Use of a cord suitable for outdoor use
reduces the risk of electric shock.
If operating a power tool in a damp location
is unavoidable, use a Ground Fault Circuit
Interrupter (GFCI) protected supply. Use of
an GFCI reduces the risk of electric shock.
Personal safety
Stay alert, watch what you are doing and
us e co mmon sense w hen opera ting a
power tool. Do not use a power tool while
you are tired or under the influence of drugs,
alcohol or medication. A moment of inattention
while operating power tools may result in
serious personal injury.
Use personal protective equipment. Always
wear eye protection. Protective equipment
such as dust mask, non-skid safety shoes, hard
hat, or hearing protection used for appropriate
conditions will reduce personal injuries.
Prevent unintentional starting. Ensure the
sw itch is in th e o ff-po sitio n b efore
connecting to power source and / or battery
pa ck, picki ng up or carrying the t ool.
Carrying power tools with your finger on the
switch or energizing power tools that have the
switch on invites accidents.
Remove any adjusting key or wrench before
turning the power tool on. A wrench or a
key left attached to a rotating part of the
power tool may result in personal injury.
Do not overreach. Keep proper footing and
balance at all times. This enables better
co ntrol of the power to ol in unexpe ct ed
situations.
Dress properly. Do not wear loose clothing
or jewelry. Keep your hair, clothing and
gloves away from moving parts. Loose
clothes, jewelry or long hair can be caught in
moving parts.
If devices are provided for the connection
of dust extraction and collection facilities,
ensure these are connected and properly
used. Use of dust collection can reduce dust-
related hazards.
Power tool use and care
Do not forc e the power to ol. Use the
correct power tool for your application. The
correct power tool will do the job better and
safer at the rate for which it was designed.
Do not use the power tool if the switch does
not turn it on and off. Any power tool that
ca nn ot be co nt ro ll ed wi th th e swi tc h is
dangerous and must be repaired.
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Disconnect the plug from the power source
and/or the 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.
Store 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.
Maintain power tools. Check for misalignment
or binding 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.
Ma ny acci de nt s ar e ca us ed by poorly
maintained power tools.
Power Tool-Specific Safety Warnings
Safety Warnings Common for
Sanding, Wire Brushing, and
Polishing Operations:
This power tool is intended to function as a
sander, wire brush or polishing tool. Read
al l sa fety wa rnings, instruct ions,
illustrations and specifications provided
with this power tool. Failure to follow all
instructions listed below may result in electric
shock, fire and/or serious injury.
Operations such as grinding or abrasive
cu tting off is not reco mmended to be
performed with this power tool. Operations
for which the power tool was not designed may
create a hazard and cause personal injury.
Do n ot use ac ces sor ies which ar e not
specifically designed and recommended by
the tool manufacturer. Just because the
accessory can be attached to your power tool,
it does not assure safe operation.
The rated speed of the accessory must be
at least equal to the ma ximum speed
marked on the power tool. Accessories
running faster than their RATED SPEED can
break and fly apart.
The outside diameter and the thickness of
your accessory must be within the capacity
rating of your power tool. Incorrectly sized
accessories cannot be adequately guarded or
controlled.
Keep cutting tools sharp and clean. Properly
maintained cutting tools with sharp cutting
edges are less likely to bind and are easier to
control.
Use the power tool, accessories and tool
bits etc. in accordance 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.
Service
Have your power tool serviced by a qualified
re pa ir person u sing on ly identical
replacement parts. This will ensure that the
safety of the power tool is maintained.
The arbor size of wheels, flanges, backing
pads or any other accessory must properly
fit the spindle of the power tool. Accessories
wi th arbo r holes that do not match the
mounting hardware of the power tool will run
out of balance, vibrate excessively and may
cause loss of control.
Do not use a damaged accessory. Before
each use inspect the accessory such as
abrasive w hee ls for chips a nd cracks,
backing pad for cracks, tear or excess wear,
wire brush for loose or cracked wires. If
power tool or accessory is dropped, inspect
fo r da mage or insta ll an undamaged
accessory. After inspecting and installing
an ac cesso ry, p ositi on yourself a nd
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.
We ar pe rsona l protective equ ipmen t.
Depending on application, use face shield,
sa fety go ggles or saf ety glasses. As
ap propr iate, wea r du st mask, hearin g
protectors, gloves and workshop apron
capable of stoppi ng small abr asive 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
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pa rticl es generat ed by yo ur op erati on.
Prolonged exposure to high intensity noise may
cause hearing loss.
Keep bystanders a safe distance away from
work area. Anyone entering the work area
must wear personal protective equipment.
Fr agmen ts of wo rkpie ce or of a broke n
accessory may fly away and cause injury
beyond immediate area of operation.
Hold po wer tool by in sul ate d gripping
su rface s only , when performing an
operation where the cutting accessory may
contact hidden wiring or its own cord.
Cutting accessory contacting a “live” wire may
make exposed metal parts of the power tool
“live” and shock the operator.
Position the cord clear of the spinning
accessory. If you lose control, the cord may be
cut or snagged and your hand or arm may be
pulled into the spinning accessory.
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.
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.
Regularly clean the power tool’s air vents.
The motor’s fan will draw the dust inside the
ho using an d excessive accum ulati on of
powdered metal may cause electrical hazards.
Do no t operate th e power tool near
flammable materials. Sparks could ignite
these materials.
Do not use accessories that require liquid
coolants. Using water or other liquid coolants
may result in electrocution or shock.
Kickback and Related Warnings
Kickback is a sudden reaction to a pinched or
snagged rotating 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 pinched 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 kickout. The wheel may
either jump toward or away from the operator,
de pendi ng on dire ction of th e wh eel’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.
Maintain a firm grip on the power tool and
position your body and arm to allow you to
resist kickback forces. Always use auxiliary
handle, if provided, for maximum control
over kickback or torque reaction during
start-up. The operator can control torque
re actio ns or kickb ack forc es, if prop er
precautions are taken.
Never place your hand near the rotating
accessory. Accessory may kickback over your
hand.
Do not position your body in the area where
power tool will move if kickback occurs.
Kickback will propel the tool i n direction
opposite to the wheel’s movement at the point
of snagging.
Use special care when working corners,
sh arp edges e tc. Avoid bou ncing and
snagging the accessory. Corners, sharp
edges or bouncing have a tendency to snag the
rotating accessory and cause loss of control or
kickback.
Do not attach a saw chain woodcarving
blade or toothed saw blade. Such blades
create frequent kickback and loss of control.
Safety Warnings Specific for Sanding
Operations:
Do not use excessively oversized sanding
di sc pa per. Fol low m anufa cturer’s
recommendations, when selecting sanding
paper. Larger sanding paper extending beyond
the sanding pad presents a laceration hazard
and may cause snagging, tearing of the disc or
kickback.
Safety Warnings Specific for
Polishing Operations:
Do not allow any loose portion of polishing
bonnet or its attachment string to spin
fr eely. Tu ck away or t rim any l oose
attac hment string s. Loose or s pinning
attachment strings can entangle your fingers or
snag on the workpiece.
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Safety Warnings Specific for Wire
Brushing Operations:
Be aware that wire bristles are thrown by
the brush even during ordinary operation.
Do not overstress the wires by applying
ex cessi ve loa d to the brush . Th e wi re
bristles can easily penetrate light clothing
and/or skin.
Additional Safety Warnings
GFCI and personal protection devices like
electrician’s rubber gloves and footwear will
further enhance your personal safety.
Do not use AC only rated tools with a DC
power supply. While the tool may appear to
work, the electrical components of the AC
rated tool are likely to fail and create a hazard
to the operator.
Keep handles dry, clean and free from oil
and grease. Slippery hands cannot safely
control the power tool.
Only use "wrap around" control handle,
supplied with tool. Use of an auxiliary side
handle will cause the hand to be within reach
of the spinning accessory.
Use clamps or other practical way to secure
and support the work pie ce to a stable
platform. Holding the work by hand or against
your body is unstable and may lead to loss of
control.
Develop a periodic maintenance schedule
for your tool. When cleaning a tool be
careful not to disassemble any portion of
th e tool sinc e interna l wires may be
misplaced or pinched or safety guard return
sp rings may be improperly moun ted.
Certain cleaning agents such as gasoline,
carbon tetrachloride, ammonia, et c. may
damage plastic parts.
If the use of a guard is recommended for
wi re brus hing, d o not allo w any
interference of the wire wheel or brush with
the guard. Wire wheel or brush may expand in
diameter due to work load and centrifugal
forces.
Risk of injury to user. The power cord must only
be serviced by a Bosch Factory Service Center
or Autho rized Bosch Service Station.
WARNING
!
drilling, and other construction activities
contains chemicals known to cause cancer,
birth defects or other reproductive harm.
Some examples of these chemicals are:
• Lead from lead-based paints,
• Crystalline silica from bricks and cement and
other masonry products, and
• Arsenic and chromiu m from chemicallytreated lumber.
Yo ur ri sk from these expo su re s var ie s,
depending on how often you do this type of
work. To reduce your exposure to these
chemicals: work in a well ventilated area, and
work with approved safety equipment, such as
those dust masks that are specially designed
to filter out microscopic particles.
Some dust created by power
sanding, sawing, grinding,
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Symbols
IMPORTANT: Some of the following symbols may be used on your tool. Please study them
and learn their meaning. Proper interpretation of these symbols will allow you to operate the
tool better and safer.
Symbol Name Designation/Explanation
V Volts Voltage (potential)
A Amperes Current
Hz Hertz Frequency (cycles per second)
W Watt Power
kg Kilograms Weight
min Minutes Time
s Seconds Time
Diameter Size of drill bits, grinding wheels, etc.
n
0
n Rated speed Maximum attainable speed
.../min Revolutions or reciprocation Revolutions, strokes, surface speed,
0 Off position Zero speed, zero torque...
1, 2, 3, ... Selector settings Speed, torque or position settings.
I, II, III, Higher number means greater speed
No load speed Rotational speed, at no load
per minute orbits etc. per minute
Infinitely variable selector with off Speed is increasing from 0 setting
Arrow Action in the direction of arrow
Alternating current Type or a characteristic of current
Direct current Type or a characteristic of current
Alternating or direct current Type or a characteristic of current
Class II construction Designates Double Insulated
Construction tools.
Earthing terminal Grounding terminal
Warning symbol Alerts user to warning messages
Li-ion RBRC seal Designates Li-ion battery recycling
program
Ni-Cad RBRC seal Designates Ni-Cad battery recycling
program
Read manual symbol Alerts user to read manual
Wear eye protection symbol Alerts user to wear eye protection
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Symbols (continued)
IMPORTANT: Some of the following symbols may be used on your tool. Please study them
and learn their meaning. Proper interpretation of these symbols will allow you to operate the
tool better and safer.
This symbol designates that this tool is listed by Underwriters Laboratories.
This symbol designates that this tool is recognized by Underwriters Laboratories.
This symbol designates that this tool is listed by Underwriters Laboratories,
to United States and Canadian Standards.
This symbol designates that this tool is listed by the Canadian Standards
Association.
This symbol designates that this tool is listed by the Canadian Standards
Association, to United States and Canadian Standards.
This symbol designates that this tool is listed by the Intertek Testing
Services, to United States and Canadian Standards.
This symbol designates that this tool complies to NOM Mexican Standards.
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Functional Description and Specifications
WARNING
!
Di sc on nect the pl ug from the po wer source be fore making any
assembly, adjustments or changing accessories. Such preventive safety
measures reduce the risk of starting the tool accidentally.
Metal Polisher
This tool is intended for polishing and brushing metal and coated surfaces as well as for
polishing stone without the use of water.
SPINDLE
LOCK
MOUNTING
BOLT
INTENDED USE
FIG. 1
RUBBERIZED
GRIP
VARIABLE SPEED DIAL
"TRI-CONTROL"
PADDLE SWITCH
VENTILATION
OPENINGS
SPINDLE
WRAP AROUND
HANDLE
MOUNTING
BOLT
Model number GP712VS
Rated speed n 750-3,000/min
Spindle thread 5/8"-11 UNC
Max. wire cup brush 4" Dia.
Max. sanding disc 7" Dia.
Max. polishing disc 7" Dia.
NOTE: For tool specifications refer to the nameplate on your tool.
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Assembly
WARNING
!
Disconnect the plug from
the pow er source be for e
making any assembly, adjustments or
changing accessories. Such preventive
safety measures reduce the risk of starting the
tool accidentally.
WARNING
!
To prevent personal injury.
Only operate t ool with the
wrap around handle.
WRAP AROUND HANDLE
The wrap around handle used to guide and
balance the tool and should be securely attach
to the front housing with the two mounting bolts
as shown. Use the wrap around handle for
ease of operation (Fig. 1).
MOUNTING ACCESSORIES
Clean the spindle and all parts to be mounted.
For tightening and loosening the accessories,
lock the spindle with the spindle lock button
(Fig. 1).
Actuate the spindle lock button only when the
spindle is at a complete standstill. Otherwise,
the tool may become damaged.
BUFFING DISC
Thread the clam pin g mandrel firmly onto
spindle and tighten it a with an open-end
spanner wrench (Fig. 2)
Mount the backing flange and the buffing disc
onto the clamping mandrel. Thread on the lock
nut and tighten with the two pin spanner
wrench.
FIG. 2
Thread on the round nut and tighten with the
two-pin spanner wrench.
Pull the lamb’s wool bonnet over the polishing
plate and tighten the attachment strings.
FIG. 3
SPINDLE
SPACER
DISCS
POLISHING
PLATE
ROUND
NUT
LAMBS
WOOL
BONNET
POLISHING SPONGE
Thread the polishing sponge firmly onto the
spindle. The lambs skin polishing bonnet can
be pulled over the polishing sponge (Fig. 4).
FIG. 4
SPINDLE
POLISHING
SPONGE
SPINDLE
CLAMPING
MANDRIL
BACKING
FLANGE
BUFFING
DISC
LOCK NUT
POLISHING PLATE
Mount the two spacer discs and the polishing
plate onto spindle (Fig. 3).
LAMBS SKIN
POLISHING
BONNET
FELT POLISHING DISC/HOOK AND
LOOP PAD
Felt polishing discs/hook and loop pads are
equipped with their own threaded hub, simply
thread on to spindle (Fig. 5). Be sure to seat
against shoulder of spindle before turning
tool “ON”.
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FIG. 5
SPINDLE
FELT
POLISHING
DISC
BACKING PAD AND SANDING DISC
WARNING
!
op erati ng s peed is no t ex ceede d by the
nameplate speed of the tool.
Place the rubber backing pad onto the spindle
shaft. Center the sanding disc on top of the
backing pad. Insert the lock nut through the
disc and thread onto the spindle as far as you
can with your fingers. Press in the spindle lock,
then tighten the backing pad securely with
spanner wrench (Fig. 6).
WARNING
!
safe operating speed is not exceeded by the
nameplate speed of the tool.
Wire brushes are equipped with their own
threaded hub, simply thread on to spindle
Before attaching a backing
pad be sure its maximum safe
WIRE CUP BRUSHES
Before a tt aching a wire
brush be sure its maximum
and securely tighten an open-end spanner
wrench (Fig. 7). Be sure to seat against
shoulder before turning tool “ON”.
TO REMOVE: Reverse procedure.
FIG. 6
SPINDLE
RUBBER
BACKING PAD
SANDING
DISC
LOCK NUT
FIG. 7
SPINDLE
WIRE CUP
BRUSH
Operating Instructions
"TRI-CONTROL" PADDLE SWITCH
The “Tri-Control” Paddle Switch enables the
operator to control the switch functions of
"Lock-OFF", "ON/OFF" and "Lock-ON".
TO UNLOCK SWITCH
AND T URN T OO L
"ON": Push paddle lever
FORWARD (toward the
spindle) then squeeze
the paddle lever.
TO SWITCH TOOL "OFF": Release pressure
on paddle lever. The switch is spring loaded
and w il l r et urn t o " OF F" posi ti on
automatically.
The "Lock-ON" feature, incorporated into the
paddle swi tch , is a conven ien ce for long
operations.
TO LOCK SWITCH "ON": After paddle switch
has been ac ti vated pus h pa ddle le ve r
completely FORWARD and release paddle
lever.
TO SWITCH TOOL "OF F": Squeeze and
then release paddle lever. The switch is
spring loaded an d will re tu rn to " OF F"
position automatically.
WARNING
!
since torque from the motor can cause the
tool to twist.
Hold the t ool w it h b oth
hands while starting the tool,
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Start the tool before applying to work and let
the tool come to full speed before contacting
the workpiece. Lift the tool from the work
before releasing the switch. DO NOT turn the
ELECTRONIC FEEDBACK
Yo ur tool is e quipped wi th an int ernal
electronic feedback system that provides a
“soft start”, which will reduce the stresses that
occur from a high torque start. The system
also helps to keep the preselected speed
virtually constant between no-load and load
conditions.
VARIABLE SPEED DIAL
This tool is equipped with a variable speed
dial. The speed may be controlled during
Sanding Operations
SELECTING SANDING DISC
Sanding discs are made of extremely hard
and sharp aluminum oxide grits, phenol-resin
bonded to a sturdy fiber backing for fast
heavy-duty service and long life. The discs
vary as to size and spacing of the abrasive
grits. OPEN COAT (type H) — used for soft
materials and on paint or varnish. CLOSED
COAT (type K) —used for metal, hardwood,
stone, marble and other materials.
Sanding discs range in grit from 16 (very
coarse) to 180 (very fine). To obtain best
results, select sanding discs carefully. Many
jobs require the use of several grit sizes and
switch “ON ” and “OF F” whil e the tool is
under load; this will greatly decrease the
switch life.
operation by presetting the dial in any one of
six positions (Fig. 1).
Dial Setting RPM
1 750
2 1200
3 1600
4 2000
5 2400
6 3000
at times both “open coat and closed coat”
discs are required to get the job done faster.
See chart for application examples.
Operation: Refinishing painted wood or metal surfaces.
REMARKS GRIT
To remove paint and to smooth Coarse
surface irregularities. 16-24-30
To smooth Medium
the rough sanding. 36-50-80
To remove scratches left by Fine
previous discs. 100-120
To smooth surfaces for painting, Very Fine
polishing or waxing. 150-180
For best results, tilt
SANDING TIPS
the Disc Sander at
a 10° to 15° angle
wh ile sand ing so
that only about 1"
of the surface around the edge of the disc
contacts the work.
If the disc (accessory) is held flat or the back
edge of the disc comes in contact with the
work, a violent thrust to the side may result.
If sander is tilted too much, sanding action
will be too great and a rough cut surface or
gouging and snagging will result.
Guide th e Di sc Sande r with cr osswise
strokes. Be careful not to hold the sander in
one spot too long. Do n ot use a cir cul ar
motio n, as this mak es s wirl mark s. T est
before use on scrap stock.
Do not fo rc e o r appl y p re ssure wh en
sanding. Use only the weight of the tool for
pressure. Excess pressure actually slows the
tool down. If faster stock removal is desired,
change to a coarser grit disc.
Remove gummy paint from metal with an
“open coat” disc. Sand until sparks start to
appear, then stop and change to a “closed
coat” disc to remove any remaining paint.
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When sanding wood the direction of the disc
SANDING WOOD
motion at the contact point should parallel the
grain as much as possible. The rapid cut of
discs and the swirl type scratch pattern they
occasionally create generally prohibit their
use for producing the final finish.
Scratches and circular marks are usually the
re su lt of using too coa rs e a gr it . Whe n
changing to a finer grit, move across the
sand ing lines that were made by a previous
coarser disc.
POLISHING TIPS
Fo r the pol is hing of w ea thered p ai nt or
buffing out scratches (e.g., acrylic glass), the
tool may be fitted with appropriate polishing
accessories such as lamb’s wool bonnet,
polishing felt or sponge (optional accessories).
Select a low speed for polishing (dial setting
1 – 2) in order to avoid excessive heating of
the surface.
Apply the compound to the surface, and use
the sponge applicator pad with light pressure
and a circular motion to remove scratches and
restore weathered finishes. Use only as much
When sanding automobiles or appliances,
SANDING METAL
wipe the metal clean with a non-flammable
solvent or commercial cleaner to remove all
wa x and grease. By doing this first, the
sanding discs will sand better and last longer.
For heavy duty work, use a coarse grit disc
first. Follow-up with a medium grit to remove
scratches. To produce smooth finish, use fine
grit disc.
co mpound a s nec essary, and clea n the
sponge frequently during use.
When initial polishing is completed, wipe away
any excess compound with a soft towel, and
then polish the surface to its final finish with the
buffing pad. Use smooth overlapping strokes
for best results.
Clean the buffing pad and sponge applicator
pad with mild detergents and warm water. DO
NOT use solvents.
Maintenance
Service
WARNING
!
orized per so n nel may result in misplacing
of internal wires and components which
could cause s er io us h azard . We
recommend that all tool service be performed
by a Bosch Factory Service Center or Autho rized Bosch Service Station.
Your Bosch tool has been properly lubricated
and is ready to use. It is recommended that
tools with gears be regreased with a special
gear lubricant at every brush change.
Pr eventiv e mainte nance
perform ed by una ut h-
TOOL LUBRICATION
The brushes and commutator in your tool
CARBON BRUSHES
have been engineered for many hours of
dependa bl e serv ic e. To mai nt ai n peak
efficiency of the motor, we recommend every
two to six months the brush es be examined.
Only genuine Bosch replace ment brushes
specially designed for your tool should be
used.
BEARINGS
After about 300-400 hours of operation, or at
every second brush change, the bearings
should be replaced at Bosch Factory Service
Center or Au thorized Bosch Service Station.
Bearings which become noisy (due to heavy
load or very abrasive material cut ting) should
be replaced at once to avoid overheating or
motor failure.
-12-
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