Stihl RB 302 User manual

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STIHL RB 302, 402
Instruction Manual
Notice d’emploi
Инструкция по эксплуатации
Instrucţiuni de utilizare

GInstruction Manual
1 - 26
FNotice d’emploi
27 - 53
RИнструкция по
эксплуатации
55 - 82
WInstrucţiuni de utilizare
83 - 108

Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2009 0458-677-9921-A. M0-2.M09.DDS. 0000000846_001_GB
RB 302, RB 402 PLUS
English
1
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Contents
Dear Customer,
Thank you for choosing a quality
engineered STIHL product.
This machine has been built using
modern production techniques and
comprehensive quality assurance.
Every effort has been made to ensure
your satisfaction and troublefree use
of the machine.
Please contact your dealer or our
sales company if you have any
queries concerning your machine.
Your
Hans Peter Stihl
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 2
Fitting, removing spray lance 6
Fitting, removing high-pressure
hose 6
Connecting the water supply 7
Connecting to a pressureless water
supply 8
Switching On 8
Working 9
Adding detergent 10
Switching Off 11
Storing the Machine 11
Transporting the Unit 11
Maintenance and Care 13
Maintenance 14
Checking the oil level 15
Oil change 15
Minimize Wear and Avoid Damage 16
Main Parts 18
Specifications 20
Special Accessories 21
Troubleshooting 23
Maintenance and Repairs 25
EC Declaration of Conformity 25
Quality Certification 26

RB 302, RB 402 PLUS
English
2
Pictograms
All the pictograms attached to the
machineareshownandexplainedinthis
manual.
Symbols in text
Engineering improvements
STIHL's philosophy is to continually
improve all of its products. For this
reason we may modify the design,
engineering and appearance of our
products periodically.
Therefore,somechanges,modifications
and improvements may not be covered
in this manual.
Observe the national safety regulations
issued, for example, by the employers'
liability insurance association, social
security institutions, occupational safety
and health authorities or other
organizations.
When not using the machine, it must be
put down in such a way that it does not
endanger anyone. Ensure that the unit
cannot be used without authorization.
The user is responsible for accidents or
risks involving third parties or their
property.
Anyone using a high-pressure cleaner
for the first time: Have your STIHL
dealer or another expert show you how
to use it safely.
Minors should never be allowed to use
the machine – except for young trainees
over the age of 16 when working under
supervision.
Do not use the machine if anyone not
wearing protective clothing is in the
working area.
The machine should only be provided or
loaned to people familiar with this model
and its operation. The instruction
manual should always be handed over
with the machine.
In some countries, operation of
machines that emit noise may be
restricted by municipal regulations.
Observe national regulations.
Always check that the machine is in
goodworkingorderbeforestartingwork.
Particular attention must be devoted to
the high-pressure hose, the spray
attachment and the safety parts.
Never operate the machine with a
defective high-pressure hose – ensure
that it is replaced immediately.
The high-pressure hose must not be
driven over, pulled, buckled or twisted.
Never pull the high-pressure hose in
order to move the machine.
The high-pressure hose must be
approved for the permissible excess
pressure of the machine.
The permissible excess pressure, the
maximum permitted temperature and
the date of manufacture are stated on
the cladding of the high-pressure hose.
The permissible pressure and date of
manufacturearespecifiedonthe fittings.
Accessories and spare parts
High-pressure hoses, fittings and
couplings are important for machine
safety. Only high-pressure hoses,
fittings,couplingsandotheraccessories
Guide to Using this Manual
Warning where there is a risk of
an accident or personal injury or
serious damage to property.
Caution where there is a risk of
damaging the machine or its
individual components.
Safety Precautions and
Working Techniques
The high water pressure
generated is a particular
source of danger.
It is important that you
carefully read the entire
Instruction Manual before
using the machine for the
first time and keep it in a
safe place for future ref-
erence. Non-compliance
with the Instruction Man-
ual may cause serious or
even fatal injury.

RB 302, RB 402 PLUS
English
3
which have been approved bySTIHL for
this machine or technically equivalent
parts may be mounted on the machine.
Contact a dealer if in doubt. Use only
high-quality accessories, in order to
avoid therisk of accidents or damageto
the machine.
STIHL recommends the use of genuine
STIHL parts and accessories. These
havebeenoptimizedfor theproduct and
the user's requirements.
Never modify the machine in any way,
as this could be extremely dangerous.
STIHL excludes all liability for personal
injury and damage to property caused
while using unauthorized attachments.
Physical suitability
The machine may only be operated by
people who are fit, in good physical
health and in good mental condition. If
you have any condition that might be
aggravated by strenuous work, check
with your doctor before operating a
machine.
Anyone who has consumed alcohol,
medicines affecting their ability to react
or drugs must not operate the machine.
If you have a pacemaker: The ignition
system of your machine produces an
electromagnetic field of very low
intensity. An effect on individual
pacemaker types cannot be excluded
entirely. STIHL recommends that you
consult your doctor and the
manufacturer of your pacemaker in
order to avoid health hazards.
Applications
The high-pressure cleaner can be used
to clean motor vehicles, machines,
tanks, facadesor stables and to remove
rust without dust or sparks.
Other uses are not permitted and may
lead to accidents or damage to the
machine.
Clothing and equipment
Wear shoes with non-slip soles.
Clothing which could become trapped in
moving parts of the machine should not
be worn. Do not wear a scarf, tie or
jewelry when operating the machine.
Long hair must be tied up and covered
(headscarf, cap, helmet, etc.).
Transporting the machine
Always switch off the engine.
Do not touch any hot parts of the
machine, in particular the muffler
surface or the gear housing – risk of
burns!
So that the machine can be transported
safely on or in a vehicle, it must be
secured with straps so that it cannot slip
or tip over and to protect it from damage
and prevent fuel spills.
Antifreeze is recommended if the
machine and accessories are to be
transported at temperatures near or
below 0° C (32 °F) – see “Storage”.
Refueling
Switch off the engine before refueling.
Never refuel the machine while the
engineisstillhot– thefuelmayspillover
– risk of fire!
Open the fuel filler cap carefully so that
any excess pressure is relieved
gradually and fuel does not splash out.
The machine may only be refueled in a
wellventilatedplace.Cleanthemachine
immediately if fuel is spilled. Change
your clothes immediately if they are
contaminated with fuel.
Close the filler cap as tightly as possible
after refueling.
This helps reduce the risk of unit
vibrations causing an incorrectly
tightened filler cap to loosen or come off
and spill quantities of fuel.
Check for leaks. Do not start the engine
if there is a fuel leak – serious or fatal
burns could result.
Wear goggles and pro-
tective clothing. STIHL
recommends that a
boilersuit be worn in
order to reduce the risk of
injury due to accidental
exposure to the high-
pressure jet.
Gasoline is an
extremely flammable
fuel – keep clear of
naked flames and fire –
do not spill any fuel – no
smoking.

RB 302, RB 402 PLUS
English
4
Detergent
Unsuitable detergents can cause
damage to health, as well as to the
machine and the object to be cleaned.
Contact a dealer if in doubt.
STIHL recommends the use of genuine
STIHL detergents. Follow the
instructions for use.
Chemical detergents may contain
physiologically harmful (toxic, caustic,
irritant), flammable or explosive
substances. Note the manufacturer's
safety data sheets!
Detergentsshouldalwaysbeusedinthe
proportions specified by the
manufacturer.
Before starting work
Only connect the high-pressure cleaner
to the drinking water main in conjunction
withabackflowpreventer–see "Special
accessories".
Do not use the machine with dirty water.
If there is a risk that dirty water will occur
(e. g., flowing sand), an appropriate
water filter must be used.
Check that the high-pressure cleaner is
in full working order. Pay particular
attention to the high-pressure hose, the
spray attachment, the safety parts and
the fuel system. Note the relevant
chapter of the instruction manual:
Inspecting the high-pressure cleaner
The high-pressure cleaner should only
be usedif it is infull working order – risk
of accident!
–It must be possible to move the
switch to the 0 position easily
–Check that the spark plug boot is
secure. A loose boot can lead to
flying sparks which may ignite the
escaping fuel/air mixture – risk of
fire!
–Inspect the high-pressure hose,
spray attachment and safety
mechanisms for damage
–High-pressure hose and spray
attachment in good condition
(clean, moving easily) and correctly
assembled
–Forgoodcontrolofthemachine,the
handles should be clean and dry
with no oil or dirt on them
–Check the oil level
–Neverattempttomodifythecontrols
or safety devices
Starting the engine
Start the engine as described in the
engine manual.
Move at least 3 meters away from the
placeatwhichthemachinewasrefueled
and never start the machine in enclosed
spaces.
Place the machine on a flat surface and
ensure a firm and safe footing.
The machine is operated by only one
person. There should not be any other
personwithintheworkingarea,noteven
when starting the machine.
Check that the speed drops: the engine
mustidlewhenthe operatorreleases the
trigger on the spray gun.
During work
Ensure you always have a firm and safe
footing.
Beware of slipping on ice, water, snow
or uneven ground!
Keep the high-pressure cleaner as far
away as possible from the object being
cleaned. Keep the machine at least 1 m
away from buildings while working.
Switch off the engine immediately in the
event of imminent danger or in an
emergency.
Do not connect the high-
pressure cleaner directly
to the drinking water
main.
Never direct the high-
pressure jet or water
hose against electrical
appliances and equip-
ment – danger of short-
circuiting!
Never direct the high-
pressure jet or water
hose against electrical
equipment, connections
and power cables – dan-
ger of short-circuiting!
Never direct the high-
pressure jet against your-
self or other people, not
even to clean clothing or
shoes – risk of injury!

RB 302, RB 402 PLUS
English
5
Do not direct the high-pressure jet
against animals.
Do not direct the high-pressure jet onto
places you cannot see.
Children, animals and bystanders must
remain at a distance.
Hazardous substances (e. g., asbestos
oroil)mustnotbeallowedtoescapeinto
the environment unchecked when
working with the machine. The
applicable environmental regulations
must be observed without fail.
Surfaces of asbestos cement must
never be cleaned with a high-pressure
jet. Hazardous, breathable asbestos
fibers may be released in addition to the
dirt. The danger is greatest when the
washed surface has dried.
Never draw in fluids containing solvents
or undiluted acids and solvents
(e. g., gasoline, heatingoil, paintthinner
or acetone). These substances damage
the materials used in the machine. The
spray is highly combustible, explosive
and poisonous.
Delicate parts made of rubber, fabric
or similar materials must not becleaned
with a pencil jet, e. g., from the rotary
nozzle. Maintain a sufficient distance
betweenthehigh-pressurehoseandthe
surface when cleaning to avoid any
damage to the surface being cleaned.
The trigger on the spray gun must move
easily and automatically return to its
starting position when released.
Alwayshold the spray attachment firmly
with both hands on the handles in order
safely to withstand the kickback force
and additional torque produced when
using spray attachments with an angled
spray lance.
Ensure that the high-pressure hose is
not damaged by being driven over,
squashed or pulled; protect it against
heat and oil.
The machine must not be covered.
Ensure that the engine is cooled
sufficiently.
Ensure proper ventilation when working
in trenches, hollows or other confined
locations – risk of serious or fatal
injury from breathing toxic fumes!
If you feel sick, if you have a headache,
vision problems (e.g., your field of vision
gets smaller), hearing problems,
dizzinessor inabilitytoconcentrate,stop
workimmediately. Suchsymptomsmay
be caused by an excessively high
concentration of exhaust emissions –
risk of accident!
No smoking when working with or near
the machine - risk of fire! The fuel tank
may give off inflammable vapors.
Safety equipment
When the safety equipment is activated,
excessive pressure is returned to the
intake side of the pump via a safety
valve. This safety feature has been set
by the manufacturer and must not be
adjusted.
After finishing work
If the machine is subjected to unusually
high loadsfor which it was not designed
(e. g., heavy impact or a fall), always
check that it is in good condition before
continuing work - refer also to the
chapter "Before starting work".
Inparticular,makecertainthatthesafety
mechanisms are working properly.
Never use the machineif it isnot in good
condition. Consult a servicing dealerif in
doubt. STIHL recommends STIHL
servicing dealers.
Before leaving the machine:
–Switch off machine
–Disconnect water intake hose
between machine and water supply
Maintenance and repairs
Themachinemustbeservicedregularly.
Do not attempt any maintenance or
repair work not described in the
InstructionManual.Allotherworkshould
be carried out by a servicing dealer.
STIHL recommends that maintenance
and repair work be carried out only by
authorized STIHL dealers. STIHL
dealers receive regular training and are
supplied with technical information.
Your power tool produces
toxic exhaust fumes as
soon as the engine is
running. These gases
may be colorless and
odorlessandmaycontain
unburnt hydrocarbons
and benzene. Never run
the engine indoors or in
poorly ventilated areas,
even if your model is
equipped with a catalytic
converter.

RB 302, RB 402 PLUS
English
6
Useonly high-quality replacementparts,
in order to avoid the risk of accidents or
damage to the machine. Contact a
dealer if in doubt.
STIHL recommends the use of genuine
STIHL spare parts. Such parts have
been optimized for the machine and the
user's requirements.
Before starting any maintenance or
repair work and before cleaning the
machine, always stop the engine –risk
of injury!
Do not service or store your unit near
any fire or flame.
Check fuel cap regularly for tightness.
Inspect ignition lead (insulation in good
condition, secure connection).
Check that the muffler is in perfect
working condition.
Do not use the machine if the muffler is
damaged or missing – risk of fire! –
Hearing damage!
Never touch a hot muffler – risk of
burns!
Stop the engine before remedying
malfunctions.
NPull back and hold the coupling (1)
NPush the spray lance (2) into the
mountonthespraygun,orpullitout
to remove the spray gun,
respectively
NRelease the coupling (1)
RB 302
Connecting the high-pressure hose
NPush high-pressure hose (1) onto
the connector
NAttach union nut (2) and screw it on
and tighten by hand
Disconnect the high-pressure hose
NUnscrew the union nut (2)
NPull high-pressure hose (1) off of
connector
RB 402 PLUS
The high-pressure hose is already
connected.
Fitting, removing spray
lance
647BA021 KN
12
Fitting, removing high-
pressure hose
677BA001 KN

RB 302, RB 402 PLUS
English
7
Disconnect the high-pressure hose
NRelease the hose reel brake
To release the hose reel brake, pull the
handle (1) downward.
To lock the brake, press the handle (1)
firmly upward until the hose reel is
locked.
NUnroll the high-pressure hose (2)
NUnscrew the union nut (3)
NOpen the hose guide (4)
NPull high-pressure hose (2) off of
connector
Connecting the high-pressure hose
NPush the high-pressure hose (2)
onto the connector of the hose reel
NAttach union nut (3) and screw it on
and tighten by hand
NPush the high-pressure hose into
the hose guide (4) and close the
hose guide.
NRelease the brake (1) on the hose
reel and wind up the high-pressure
hose
High-pressure hose and spray gun
Connection
NPush the high-pressure hose (1)
onto the connector (2)
NAttach union nut (3) and screw it on
and tighten by hand
Disconnection
NPush the coupling (4) in the
direction of the arrow and hold it
NLoosen the union nut (3) and
unscrewit from the connector inthe
direction of the arrow
High-pressure hose extension
As a rule, always use only one high-
pressure hose extension – see "Special
accessories"
Briefly rinse out the water hose before
connecting it to the machine to prevent
sand and other particles from entering
the machine.
NConnecthose(3/4" diameter,length
at least 10 m to absorb pressure
surges)
NMesh the jaws of the hose
connector (1) and coupling (2) with
each other and turn right as far as
possible
NTurn on water supply
In suction operation, the machine can
also be connected to rivers, lakes,
cisterns and tanks, etc. – see
"Connecting to a pressureless water
supply".
677BA023 KN
1
2
3
647BA022 KN
647BA023 KN
3
4
Connecting the water
supply
677BA004 KN
RB 302
RB 402 PLUS

RB 302, RB 402 PLUS
English
8
Connection to the drinking water
main
When hooking up to the drinking water
main, a backflow preventer (Type BA in
accordance with EN 1717) must be
installed between the water tap and the
hose.
Follow the rules laid down by the local
water supply company to prevent water
flowing back from the high-pressure
cleaner into the drinking water main.
NConnect the machine to the
pressurizedwatersupplyandstartit
up briefly in accordance with the
Instruction Manual
NSwitch off machine
NDisconnect the high-pressure hose
NReplace water intake hose with
suction hose (special accessory)
Always use the connecting element
supplied with the intake hose to connect
the hose. The standard connecting
elements are watertight only when used
with a pressurized water supply and for
this reason are not suitable for suction
operation.
NFill the suction hose with water and
immerse the suction cup of the
suction hose in the water tank – do
not use dirty water
NSwitch on the machine
NWait until a steady jet exits the high-
pressure hose connection
NSwitch off machine
NConnect high-pressure hose
NSwitch on the machine with the
spray gun open
NActuate thespray gun several times
briefly in order to bleed the airout of
the machine as quickly as possible
NTurn on water supply
NCompletelyunrollthehigh-pressure
hose
NStart the engine as described in the
engine manual.
NPoint the spray gun at the object to
be cleaned – never at persons!
003BA004 KN
Connecting to a
pressureless water supply
As a rule, it is advisable to use a
water filter.
Switching On
The machine may only be
switched on when the water intake
hose is connected and the water
supply has been turned on.
Otherwise the machine may be
damaged due to lack of water.

RB 302, RB 402 PLUS
English
9
Actuate the spray gun
NDirectthesprayattachmenttowards
the object to be cleaned
NPoint the rotary nozzle downwards
when starting (if fitted)
NPress the safety latch (1) in the
direction of the arrow – the lever (2)
is unlatched
NSqueeze the lever (2)
The engine runs at reduced speed in
standby mode to reduce energy
consumption and noise levels.
The engine switches from operating
speed to idling speed when the spray
gun is not actuated.
Standby mode
Pressure/quantity control on the
machine
Working pressure and water flow rate
can be set on the high-pressure pump
for long-term adjustment in line with the
cleaning job concerned.
NTurn the knob (3) to set the working
pressure and water flow rate
The pressure in the high-pressurepump
is indicated by a pressure gauge (4).
Pressure control at the nozzle
The operating pressure can be infinitely
adjusted at the nozzle.
NTurn the nozzle sleeve – the
quantity of water delivered remains
unchanged
High-pressure hose
Storing accessories
Roll up the high-pressure hose. Store
the spray attachment directly on the
machine.
Working
The machine must not be
operated in standby mode for
more than 5 minutes. If work is
interrupted for more than 5 min.,
during breaks or if the machine is
left unattended, switch off the
engine – as described in the
engine manual.
1
647BA024 KN
4
677BA005 KN
RB 302
RB 402 PLUS
3
3
4
Do not buckle or loop the high-
pressure hose.
Do not place any heavy objects on
the high-pressure hose, and do
not drive any vehicles over it.
647BA025 KN

RB 302, RB 402 PLUS
English
10
RE 302
RE 402 PLUS
With the intake hose, detergent can be
drawn in and added from a separate
container.
NFilltheseparatedetergentcontainer
with STIHL detergent diluted as
specified
NSlide the pickup body of the intake
hose as far as possible into the
detergent container
If high-pressure hose extensions are
connected, it is impossible to draw in
detergent from the detergent container.
Detergent can only be drawn into the
machine in low-pressure operation.
NTurn sleeve as far aspossiblein the
direction of the arrow (low-pressure
operation)
NWhen applying detergent, start at
the bottom and work upwards
Detergent must not be allowed to dry on
the object to be cleaned.
If detergent is no longer to be added:
NImmerse the pickup body in clear
water
NLet the high-pressure cleaner
continue to run with the spray gun
openuntilnomoredetergentcomes
out of the nozzle
Nsee “Switching off the machine”
677BA018 KN
677BA019 KN
Adding detergent
631BA008 KN
647BA028 KN

RB 302, RB 402 PLUS
English
11
NSwitch off engine as described in
the engine instruction manual
supplied
NTurn off water supply
NActuate the spray gun until water
merely drips from the spray head –
the machine is now depressurized
NRelease trigger
NPress the safety latch (1) in the
direction of the arrow – the spray
gun is locked to prevent inadvertent
operation
NDisconnect water intake hose from
machine and water supply
After use
NRoll the high-pressure hose up on
the brackets provided for this
purpose – see "Main parts of the
machine"
Store the machine in a dry room where it
is protected from frost.
If protection from frost cannot be
guaranteed, draw glycol-based
antifreeze – like that used in motor
vehicles – into the pump:
NDisconnect water intake hose
NRemove spray lance – see "Fitting,
removing spray lance"
NSwitch on the machine, switch it off
again after a maximum of 1 minute
NConnect suction hose (special
accessory)tothewaterintakeofthe
machine and immerse it in the
container with antifreeze
NInsertspraygunwithoutspraylance
in the same container
NStarting the engine
NActuate the spray gun until a
uniform jet emerges
NRemove suction hose from the
container with antifreeze
NActuate the spray gun to pump out
the rest of the antifreeze
NSwitch off the engine
NKeep leftoverantifreeze in a sealed
container
Removing the pushbar
The pushbar can be removed to simplify
transport in vehicles:
NUndo both star handles (1)
NLift off the pushbar (2)
Switching Off
1
647BA029 KN
Storing the Machine Transporting the Unit
2
677BA017 KN
1
1

RB 302, RB 402 PLUS
English
12
Attaching the pushbar
NPush both ends of the pushbar (2)
between the retaining bushes (3)
and the tubes of the chassis over
the screw
NTighten both star handles (1) by
hand – the pushbar is secured
1
3
3
677BA022 KN
2
1

RB 302, RB 402 PLUS
English
13
Maintenance and Care
The following maintenance intervals apply in normal operating conditions. The spec-
ified intervals must be shortened accordingly for longer daily working hours. If the
machine is only used occasionally, the intervals can be extended accordingly.
before starting work at the end of work and/or daily weekly or every 40 hours of operation monthly quarterly or every 200 hours of operation every six months or every 500 hours of operation if faulty if damaged as required
Complete machine Visual inspection (condition, leaks) X
clean XX
Oil level of the high-pressure pump check X
Oil of the high-pressure pump change 1) 2) X
Gearbox oil (RB 402 PLUS only) check X
change 1) X
Connectors on high-pressure hose clean XX
grease X
Plug-type coupling of the spray lance and
the coupling sleeve of the spray gun clean XX
Water intake strainer in the high-pressure
inlet clean XX
replace X
High pressure nozzle clean X
replace X
Ventilation openings clean X
Injector clean X
Rubber buffers check X
replace X
Engine maintain as described in the enclosed engine instruction manual
1) for the first time after 50 hours of operation
2) for RB 302, additional oil changes every six months or after every 200 hours of operation

RB 302, RB 402 PLUS
English
14
Always switch off the engine before
servicing or cleaning the machine.
Inordertoensuretroublefreeoperation,
we recommend carrying out the
followingstepswheneverthemachineis
used:
NRinse the water hose, high-
pressure hose, spray lance and
accessories with water before fitting
them
NRemove all sand and dust from the
plug-type coupling of the spray
lance and the couplingsleeve of the
spray gun
Cleaning the high-pressure nozzle
Since the pump pressure increases if
thenozzleis clogged,itmustbecleaned
immediately.
NSwitch off the engine
NActuate the spray gun until water
merely drips from the spray head –
the machine is now depressurized
NRemove spray lance
NClean nozzle with a suitable needle
NRinse spray lance with water from
the nozzle end
Cleaning the water intake screen
The water intake screen must be
cleaned every week or more often if
necessary.
NDisconnect hose (1)
NCarefullyreleasethescreen (2)with
pliers and rinse it
NBefore refitting the screen, ensure
that it is undamaged and replace if
necessary
Clean ventilation openings
The machine must be kept clean so that
cooling air can flow freely through the
openings in the engine.
Cleaning the injector
The injector must be cleaned whenever
detergent has been used.
NImmerse the pickup body in clear
water
NActuate the spray gun for
approx. 5 seconds
Lubricate connections
Lubricate the connections on the high-
pressure hose as needed
Servicing the engine
The engine must be serviced as
described in the engine instruction
manual supplied.
Check the rubber buffers
The front rubber buffers must be
replaced if damaged or worn, to ensure
the stability of the machine.
Maintenance
647BA031 KN
Always remove the spray lance
before cleaning the nozzle.
1
677BA013 KN
2
631BA008 KN

RB 302, RB 402 PLUS
English
15
High-pressure pump
The oil level in the high-pressure pump
and the gearbox (RB 402 PLUS only)
must be checked at monthly intervals.
NPlace the machine on a flat
horizontal surface
NCheck that the oil is level with the
center of the oil sight glass
NIf necessary, add oil (SAE 15 W 40)
Engine
Check the engine oil level as described
in the engine instruction manual
supplied.
NLet the machine warm up – this will
simplify the oil change
Waste oil must be disposed of in
accordance with the statutory
regulations.
High-pressure pump
NRemove shroud
RB 302
First oil change after 50 hours of
operation, then every six months or
every 200 hours of operation.
NUnscrew oil filler cap (1)
NPlace a suitable container (1 liter)
under the pump
NUnscrew the oil sight glass (2) and
tilt the machine to drain it
NDrain oil into container
NScrew in and tighten the oil sight
glass (2)
NAdd oil (180 ml, SAE 15 W 40)
NCheck the oil level
NRefit and tighten oil filler cap
NRefit the shroud
RB 402 PLUS
First oil change after 50 hours of
operation, then every six months or
every 500 hours of operation.
NUnscrew oil filler cap (1)
NPlace a suitable container (1 liter)
under the pump
NUnscrew the oil drain plug (3)
NDrain oil into container
NRefit and tighten oil drain plug
NAdd oil (560 ml, SAE 15 W 40)
NCheck the oil level
NRefit and tighten oil filler cap
NRefit the shroud
Engine
The engine oil must be changed as
described in the engine instruction
manual supplied.
Checking the oil level
The engine stops automatically if
the oil level is too low. The engine
cannot be started without the
correct oil level.
677BA012 KN
Oil change
677BA009 KN
1
2
1
3
677BA010 KN

RB 302, RB 402 PLUS
English
16
Gearbox (RB 402 PLUS)
First oil change after 50 hours of
operation, then every six months or
every 500 hours of operation.
NUnscrew oil filler cap (1)
NPlace a suitable container (1 liter)
under the pump
NUnscrew the oil drain plug (3)
NDrain oil into container
NRefit and tighten oil drain plug
NAdd oil (275 ml, SAE 15 W 40)
NCheck the oil level
NRefit and tighten oil filler cap
Compliance with the specifications of
this Instruction Manual will avoid
excessive wear and damage to the
machine.
The machine must be used, maintained
and stored as carefully as described in
thisInstructionManualandtheenclosed
engine instruction manual.
The user is responsible for all damage
caused by failure to comply with the
safety, operating and maintenance
instructions. This applies in particular
for:
–product modifications not
authorized by STIHL
–use of accessories that are not
approved for the machine,
unsuitable or of inferior quality
–use of the machine in a manner not
in keeping with the intended use
–Use of the machine in sporting
events or competitions
–Consequential damages due to
continued use of a machine with
defective components
–Damage due to freezing
–Damage due to improper power
supply voltage
–Damage due to poor water supply
(e. g., cross-section of the intake
hose too small)
Maintenance work
All of the tasks listed under
"Maintenance and Repairs" and in the
enclosed engine instruction manual
must be carried out periodically. If the
user does not carry out these
maintenance tasks him- or herself, they
should be delegated to a dealer.
STIHL recommends that maintenance
and repair work be carried out only by
authorized STIHL dealers. STIHL
dealers receive regular training and are
supplied with technical information.
If these tasks are not performed or are
performed improperly, this may result in
damage for which the user is
responsible. Among other things, this
includes:
–Damage to machine components
due to delayed or insufficient
performance of maintenance
–Corrosion damage and other
consequential damages due to
improper storage
–Damage to the machine as a result
of using replacement parts of
inferior quality
Parts Subject to Wear and Tear
Some parts of the machine are subject
to normal wear and tear even when the
machine is used in conformity with its
intended use. These parts must be
replaced in due time, depending on the
nature and duration of use. These
include, among others:
3
1
677BA011 KN
Minimize Wear and Avoid
Damage

RB 302, RB 402 PLUS
English
17
–High-pressure nozzles
–High-pressure hoses

RB 302, RB 402 PLUS
English
18
RB 302
1Spray gun
2Coupling for spray lance
3Safety catch
4Lever
5Safety latch for high-pressure hose
6Union nut for high-pressure hose
7Nozzle
8Selector sleeve for the working
pressure
9High-pressure hose
10 Pressure gauge
11 Pressure/quantity control knob
12 Oil filler cap
13 Connector high-pressure hose
14 Water inlet with screen
15 Suction hose for detergent
16 Push bar
17 Star knob
18 Holder for high-pressure hose
19 Holder for spray attachment
20 Oil viewglass (oil drain plug)
21 Engine switch
#Model plate
Refer to the engine instruction manual
for the main engine components.
Main Parts
17 18
17
18
11 12
15
10 13 21
20
19
#19
677BA020 KN
2
8
5
6
1
3
7
9
16