Stihl RMA 339.0 Instruction Manual

STIHL RMA 339, RMA 339 C

EN

Instruction manual

RMA 339.0 RMA 339.0 C

B

0478 131 8327 B. C22. TIM-7372-005 © 2022 STIHL Tirol GmbH

1

0478 131 8327 B

1

2

0478 131 8327 B

Dear Customer,

Thank you for choosing STIHL. We
develop and manufacture our quality
products to meet our customers'
requirements. The products are designed
for reliability even under extreme
conditions.

STIHL also stands for premium service
quality. Our specialist dealers guarantee
competent advice and instruction as well
as comprehensive service support.

We thank you for your confidence in us
and hope you will enjoy working with your
STIHL product.

Dr. Nikolas Stihl

IMPORTANT: READ BEFORE USE AND
KEEP IN A SAFE PLACE.

1. Table of contents

Notes on the instruction manual 4

General 4
Instructions for reading the

instruction manual 4
Country-specific versions 5

Machine overview 6
For your safety 7

General 7
Clothing and equipment 8
Battery 8
Charger 9
Charging 9
Transporting the machine 10
Transporting the battery 10
Before operation 10
Working with your machine 11
Maintenance, cleaning, repairs and

storage 12
Storage for prolonged periods

without operation 13
Disposal 13

Description of symbols 14
Standard equipment 15
Preparing the machine for

operation 16

General points 16
Installing the mono handlebar

(RMA 339 C) 16
Installing the dual handlebar

(RMA 339) 17
Assembling the grass catcher box 17

Battery and charger 18

General 18
Connecting the charger to the

mains 18

Removing/inserting the battery 18
Charging the battery 19
LEDs on the battery 19
LED on the charger 20

Controls 20

Battery compartment 20
Safety plug 20
Eco mode switch 21
Adjusting the mono handlebar

(RMA 339 C) 21
Folding down the dual handlebar

(RMA 339) 21
Central cutting height adjustment 22
Grass catcher box 22
Level indicator 23

Notes on working with the
machine 23

General 23
Cutting performance 23
Working area for operator 23
Correct motor load 24
If the mowing blade blocks 24
Thermal motor overload protection 24

Safety devices 24

Safety plug 24
Safety devices 24
Two-hand operation 24
Motor run-down brake 24

Operating the machine 24

Preparatory measures 24
Switching the lawn mower on 24
Switching the lawn mower off 25
Emptying the grass catcher box 25

Maintenance 26

General 26
Cleaning the machine 26
Electric motor and wheels 27

EN

0478 131 8327 B - EN

Printed on chlorine-free bleached paper. Paper is recyclable. Cover is halogen free.

3

Battery 27
Charger 27
Checking blade wear 27
Removing and installing the

mowing blade 28
Sharpening the mowing blade 28
Storage (winter break) 28

Transport 29

Carrying and securing the lawn
mower 29

Transporting the battery 30

Minimising wear and preventing
damage 30

Environmental protection 31
Standard spare parts 31
Technical specifications 31

STIHL AK battery 32
STIHL charger AL 101 32

Troubleshooting 32
Service schedule 34

Handover confirmation 34
Service confirmation 34

2. Notes on the instruction manual

2.1 General

This instruction manual constitutes
original manufacturer's instructions in
the sense of EC Directive 2006/42/EC.

STIHL is continually striving to further
develop its range of products; we therefore
reserve the right to make alterations to the
form, technical specifications and
equipment level of our standard
equipment.

For this reason, the information and
illustrations in this manual are subject to
alterations.

This instruction manual may describe
models that are not available in all
countries.

This instruction manual is protected by
copyright. All rights reserved, especially
the right of reproduction, translation and
processing using electronic systems.

2.2 Instructions for reading the instruction manual

Illustrations and texts describe specific
operating steps.

All symbols which are affixed to the
machine are explained in this instruction
manual.

Viewing direction:

Viewing direction when "left" and "right"
are used in the instruction manual:
the user is standing behind the machine
and is looking forwards in the direction of
travel.

Section reference:

References to relevant sections and
subsections for further descriptions are
made using arrows. The following example
shows a reference to a section: (Ö 3.)

Designation of text passages:

The instructions described can be
identified as in the following examples.

Operating steps which require intervention
on the part of the user:

● Release bolt (1) using a screwdriver,
operate lever (2)...

General lists:

– Use of the product for sporting or

competitive events

Texts with added significance:

Text passages with added significance are
identified using the symbols described
below in order to especially emphasise
them in the instruction manual:

Danger

Risk of accident and severe injury
to persons. A certain type of
behaviour is necessary or must be
avoided.

Warning

Risk of injury to persons. A certain
type of behaviour prevents possible
or probable injuries.

Caution

Minor injuries or material damage
can be prevented by a certain type
of behaviour.

Note

Information for better use of the
machine and in order to avoid
possible operating errors.

Illustrations with text passages:

Operating steps relating directly to the
illustration can be found immediately after
the illustration, with a corresponding
reference to the item numbers.

Example:

4

0478 131 8327 B - EN

Insert mains plug (1) in socket (2).

Texts relating to illustrations:

Illustrations relating to use of the machine
can be found in the front of this instruction
manual.

The camera symbol serves to link
the figures on the illustration pages
with the corresponding text
passages in the instruction manual.

2.3 Country-specific versions

STIHL supplies chargers with different
plugs and switches, depending on the
country of sale.

Chargers with European plugs are shown
in the illustrations. Chargers with other
types of plug are connected to the mains in
a similar way.

1

EN

0478 131 8327 B - EN

5

3. Machine overview

6

0478 131 8327 B - EN

1 Upper handlebar
2 Lower handlebar (RMA 339)
3 Bracket (RMA 339 C)
4 Housing
5 Motor hood
6 Rear wheel
7 Front wheel
8 Grass catcher box
9 Upper transport handle
10 Lower transport handle
11 Discharge flap
12 Rotary handle (RMA 339)
13 Handlebar detent lever (RMA 339 C)
14 Level indicator (grass catcher box)
15 Motorstop lever
16 Height adjustment lever
17 ON button
18 Rating plate with machine number
19 Cover
20 Safety plug
21 Eco mode switch
22 Battery
23 Charger

4. For your safety

4.1 General

These safety regulations must
be observed when working with
the machine.

Read the entire instruction
manual before using the
machine for the first time. Keep
the instruction manual in a safe

place for future reference.

These safety precautions are essential for
your safety, however the list is not
exhaustive. Always use the machine in a
reasonable and responsible manner and
be aware that the user is responsible for
accidents involving third parties or their
property.

Make sure that you are familiar with the
controls and use of the machine.

The machine must only be used by
persons who have read the instruction
manual and are familiar with operation of
the machine. The user should seek expert
and practical instruction prior to initial
operation. The user must receive
instruction on safe use of the machine
from the vendor or another expert.

During this instruction, the user should be
made aware that the utmost care and
concentration are required for working with
the machine.

Residual risks persist even if you operate
this machine according to the instructions.

Risk of death from suffocation!

Packaging material is not a toy ­danger of suffocation! Keep
packaging material away from
children.

Only give or lend the machine, including
any accessories, to persons who are
familiar with this model and how to operate
it. The instruction manual forms part of the
machine and must always be provided to
persons borrowing it.

Make sure that the user is physically,
sensorily and mentally capable of
operating the machine and working with it.
If the user is physically, sensorily or
mentally impaired, the machine must only
be used under supervision or following
instruction by a responsible person.

Make sure that the user is of legal age or
being trained under supervision in a
profession in accordance with national
regulations.

The machine must only be operated by
persons who are well rested and in good
physical and mental condition. If your
health is impaired, you should consult your
doctor to determine whether working with
the machine is possible. The machine
should not be operated after the
consumption of alcohol, drugs or
medications which impair reactions.

The machine is intended for private use.

Caution – risk of accident:

The machine is only intended for mowing
lawns. Its use for other purposes is not
permitted and may be dangerous or result
in damage to the machine.

Due to the physical danger to the user, the
machine must not be used for the following
applications (incomplete list):

– for trimming bushes, hedges and

shrubs,

– for cutting creepers,

– for the care of lawn roofs and balcony

boxes,

– for shredding or chopping tree or hedge

cuttings,

– for clearing paths (vacuuming,

blowing),

– for levelling earth mounds, e.g. mole

hills,

– for transporting clippings, except in the

grass catcher box intended for this
purpose.

For safety reasons, any modification to the
machine, except the proper installation of
accessories approved by STIHL, is

EN

0478 131 8327 B - EN

7

forbidden and results in voiding of the
warranty cover. Information regarding
approved accessories can be obtained
from your STIHL specialist dealer.

In particular, any tampering with the
machine which increases the power output
or speed of the engine or motor is
forbidden.

It is not permissible to make any
modifications to the machine that could
lead to increased noise emissions.

It is not permitted to transport objects,
animals or persons, particularly children,
on the machine.

Particular care is required during use in
public green spaces, parks, sports fields,
along roads and in agricultural and forestry
businesses.

Only release the machine if it is on a level
surface and cannot roll away by itself.

Caution! Danger to health due

to vibrations. Excessive

exposure to vibrations can

result in damage to the

cardiovascular or nervous system,
particularly in persons with cardiovascular
problems. Please consult a physician if
you experience symptoms that may have
been caused by vibrational loads.
Symptoms of this kind principally affect the
fingers, hands or wrists and include
(incomplete list):

– numbness,

– pain,

– muscular weakness,

– skin discolouration,

– unpleasant tingling sensation.

Hold the handlebar tightly, but not tensed,
with both hands in the designated
locations during operation.

Plan your working times so that more
severe physical strains over a longer
period are avoided.

4.2 Clothing and equipment

Always wear sturdy footwear
with high-grip soles when
working. Never work barefoot

or, for example, in sandals.

Also always wear sturdy gloves
and tie up and secure long hair
(headscarf, cap, etc.) when

performing maintenance and
cleaning work or when transporting the
machine.

Wear suitable safety glasses

when sharpening the mowing

blade.

Always wear long trousers and
tight-fitting clothing when operating the
machine.

Never wear loose clothes which may
become caught on moving parts (control
levers) – do not wear jewellery, ties or
scarves.

4.3 Battery

Children cannot recognise or evaluate the
dangers posed by batteries. There is a risk
of serious injury to children.

● Keep children away.

● Keep the battery out of the reach of

children.

The battery is not protected against all
ambient conditions. If exposed to certain
ambient conditions, the battery may catch
fire or explode. Persons could be injured or
property damaged.

● Protect the battery against
heat or fire.

● Do not throw the battery into a
fire.

● Observe the permissible
temperature range for the
battery. (Ö 18.1)

● Keep the battery away from
metallic objects.

● Protect the battery against
rain and moisture. Do not
immerse in liquids.

● Do not subject the battery to
high pressure.

● Do not subject the battery to
microwaves.

● Protect the battery against chemicals
and salts.

● Do not drop the battery.

● Keep the battery clean and dry.

● Store the battery in a locked, room.

● Store the battery away from the lawn

mower and from the charger.

● Keep the battery in electrically non­conductive packaging.

● Store the battery within the permissible
temperature range. (Ö 18.1)

The battery is in good operating
condition when the following conditions
are met:

– The battery is not damaged.

– The battery is clean and dry.

8

0478 131 8327 B - EN

– The battery is operative and has not

been modified.

The battery can not operate safely if it is
not in good operating condition. There is a
risk of serious injury to persons.

● Do not work with a damaged or
defective battery.

● Do not charge a damaged or defective
battery.

● If the battery is dirty or wet: clean the
battery and allow it to dry.

● Do not modify the battery.

● Do not insert any objects into the

apertures in the battery.

● Never connect the battery terminals
with metallic objects and cause a short
circuit.

● Do not open the battery.

Fluid may escape from a damaged battery.
If the fluid enters into contact with the skin
or eyes, this may cause irritation.

● Avoid contact with the fluid.

● In the event of contact with the skin:

Wash the affected areas with plenty of
soap and water.

● In the event of contact with the eyes:
Rinse the eyes with plenty of water for
15 minutes and seek medical attention.

A damaged or defective battery may emit
a strange odour, smoke, or catch fire.
Persons could be seriously or fatally
injured and property may be damaged.

● If the battery emits a strange odour or
smokes: Do not use the battery and
keep it away from flammable materials.

● If the battery catches fire: extinguish the
battery using a fire extinguisher or
water.

4.4 Charger

Children cannot recognise or evaluate the
dangers posed by the charger or by
electrical current. There is a risk of serious
injury to children.

● Keep children away.

● Keep the charger out of the reach of

children.

The charger is not protected against all
ambient conditions. If exposed to certain
ambient conditions, the charger may catch
fire or explode. Persons could be injured or
property damaged.

● Do not operate the charger in a highly
flammable or explosive environment.

● Do not operate the charger on a highly
flammable surface.

● Observe the permissible temperature
range for the charger.

● Operate the charger in a dry
and locked room.

● Store the charger away from
the lawn mower and from the battery.

● Allow the charger to cool down before
putting it into storage.

● Keep the charger clean and dry.

● Store the charger in a locked, room.

The charger is in good operating
condition when the following conditions

are met:

– The charger is not damaged.

– The charger is clean and dry.

– The charger is operative and has not

been modified.

If not in good operating condition,
components can no longer operate
correctly and safety devices may be dis
abled. There is a risk of serious injury to
persons.

● Do not use a damaged or defective
charger. Dispose of the charger.

● If the charger is dirty or wet: clean the
charger and allow it to dry.

● Do not modify the charger.

● Do not insert any objects into the

apertures in the charger.

● Never connect the charger terminals
with metallic objects and cause a short
circuit.

● Do not open the charger.

The electric cable is not intended for
carrying or suspending the charger. The
electric cable and the charger could
become damaged.

● Pick up and hold the charger by the
housing. A recessed grip is provided on
the housing for easy lifting of the
charger.

● Store the charger on the wall bracket.

4.5 Charging

Contact with live components can result
from the following causes:

– The electric cable is damaged.

– The mains plug is damaged.

– The socket is incorrectly installed.

Contact with live components can result in
an electric shock. The user could be
seriously or fatally injured.

EN

0478 131 8327 B - EN

9

● The mains plug and electric cable are
particularly important when it comes to
electrical safety.

● Insert the mains plug in a correctly
installed socket.

An incorrect mains voltage or an incorrect
mains frequency during charging may lead
to overvoltage in the charger. The charger
could become damaged.

● Ensure that the mains voltage and the
mains frequency of the power supply
correspond to the information contained
in the rating plate on the charger.

A damaged or defective charger may emit
a strange odour or smoke. Persons could
be injured or property damaged.

● Remove mains plug from socket.

In the case of insufficient heat dissipation,
the charger could overheat, causing a fire.
Persons could be seriously or fatally
injured and property may be damaged.

● Do not cover the charger.

● Store the charger on the wall bracket.

If several chargers are connected to a
socket, electrical wires could become
overloaded during charging. The electrical
wires could heat up and cause a fire.
Persons could be seriously or fatally
injured and property may be damaged.

● Only connect one charger to a socket.

● Do not connect a charger to multiple

sockets.

4.6 Transporting the machine

Always wear protective gloves (Ö 4.2) in
order to prevent injuries due to sharp­edged and hot components.

Switch off the machine prior to

transport, allow the blade to
come to a standstill and remove the safety
plug.

Only transport the machine once the motor
has cooled down.

Take the weight of the machine into
account and use suitable loading aids
(loading ramps, lifters) if necessary.

Secure the machine and any machine
components being transported (e.g. grass
catcher box) on the load floor using
fastening material of adequate size (belts,
ropes, etc.).

Avoid contact with the mowing blade when
lifting and carrying the machine.

Observe the information in the section
"Transport". It describes how to lift and
lash the machine. (Ö 14.)

When transporting the machine, always
observe regional legislation, especially
regarding load security and the transport
of objects on load floors.

4.7 Transporting the battery

The battery is not protected against all
ambient conditions. If exposed to certain
ambient conditions, the battery may
become damaged and property may be
damaged

● Do not transport a damaged battery.

● Transport the battery in the machine, in

electrically non-conductive packaging
or in an electrically non-conductive
transport container.

During transport outside of the machine,
the battery could tip over or move. Persons
could be injured or property damaged.

● Pack the battery in the packaging or
transport container in such a way that it
cannot move.

● Secure the packaging or transport
container so that the packaging or
transport container cannot move.

Do not leave the battery inside a vehicle
and never expose it to direct sunlight.

Lithium-ion batteries must be treated with
special care during transport. In particular,
it must be ensured that short circuits are
prevented during transport of the batteries.
For this reason, keep the original
cardboard packaging of the battery and
always transport STIHL batteries either in
the undamaged original packaging or in
the lawn mower.

4.8 Before operation

Make sure that only persons who are
familiar with the instruction manual are
permitted to use the machine.

Observe the local regulations regarding
permitted operating times for gardening
power tools with electric motors.

Carefully inspect the complete area on
which the machine is to be used and
remove any stones, sticks, wires, bones
and other foreign objects which could be
thrown up by the machine. Obstacles (e.g.
tree stumps, roots) can be easily
overlooked in long grass.

For this reason, mark all foreign objects
(obstacles) which are hidden in the lawn
and cannot be removed before
commencing work with the machine.

All faulty, worn or damaged parts must be
replaced before using the machine.
Replace any illegible or damaged danger
signs and warnings on the machine. Your

10

0478 131 8327 B - EN

STIHL specialist has a supply of
replacement stickers and all the other
spare parts.

Risk of injury!

Worn or damaged parts (e.g. blunt
blades) can affect the safety of the
machine and result in injury to the
user.

The machine must only be used in good
operating condition. Before each use,
check whether:

– The machine is properly assembled.

– The cutting tool and the entire cutting

unit (mowing blade, fastening elements,
mowing deck housing) are in good
condition. In particular check for secure
fastening, damage (notches or cracks)
and wear.

– The safety devices (e.g. discharge flap,

housing, handlebar, motorstop lever)
are in good condition and working
properly.

– The grass catcher box is undamaged

and correctly installed; a damaged
grass catcher box must not be used.

– The run-down brake of the electric

motor is functioning.

Carry out any necessary work or consult a
specialist dealer. STIHL recommends
STIHL specialist dealers.

Never switch the motor on without a
correctly installed blade. Risk of motor
overheating.

Follow the instructions in the "Battery"
(Ö 4.3) and "Charger" (Ö 4.4) sections.

4.9 Working with your machine

Never work when animals or
persons, particularly children,
are in the danger area.

Do not work at ambient temperatures
below +5°C (41°F).

Only work during the day or with good
artificial light.

Do not operate the machine in the rain or
during thunder storms, particularly when
there is a risk of lightning strike.

Caution – risk of injury!

Never put hands or feet on or
underneath rotating parts.

Never touch the rotating blade.
Always keep away from the discharge
opening.

Always observe the safety distance
provided by the handlebar. The handlebar
must always be installed correctly and
must not be modified. Never operate the
machine with the handlebar folded down.

The switch and safety devices installed in
the machine must not be removed or
bypassed. In particular, never secure the
motorstop lever to the handlebar (e.g. by
tying it).

Never attach any objects to the handlebar
(e.g. work clothing).

The risk of accidents is higher if the ground
is damp due to increased danger of
slipping.
Particular caution should be exercised
during working in order to prevent slipping.
If possible, avoid using the machine when
the ground is damp.

Do not leave the machine in the rain.

Always keep the battery compartment
closed during operation.

Switching on the machine:

Exercise care when switching on the
machine and observe the instructions in
the section "Initial operation of the
machine". (Ö 12.)
Keep your feet a safe distance from the
cutting tool.

Place the machine on an even surface
before switching it on.

The machine must not be tilted before it is
switched on or during switching-on.

Do not switch on the motor if the discharge
chute is not covered by the discharge flap
or the grass catcher box.

Avoid switching the machine on repeatedly
within a short period of time; in particular
avoid "playing" with the ON button. Risk of
motor overheating.

Working on slopes:

Always work across and back on slopes,
never up and down.
If the user loses control when mowing up
and down, there is a risk of being run over
by the machine.

Be particularly careful when changing
direction on a slope.

Always ensure good stability on slopes
and avoid mowing on excessively steep
slopes.

For safety reasons, the machine must not
be used on slopes with an inclination of
more than 25° (46.6%). Risk of injury!

EN

0478 131 8327 B - EN

11

A slope inclination of 25° corresponds to a
vertical height increase of 46.6 cm for a
100 cm horizontal distance.

Working:

Caution – risk of injury!

Never put hands or feet on or
underneath rotating parts.

Never touch the rotating blade.
Always keep away from the discharge
opening. Always observe the safety
distance provided by the handlebar.

Do not try to examine the blade
while the machine is operating.

Never open the discharge flap
and/or remove the grass catcher box when
the mowing blade is running. Rotating
blades can cause injury.

Only operate the machine at walking
speed – never run when working with the
machine. Working quickly with the
machine increases the risk of injury due to
stumbling, slipping, etc.

Be particularly careful when turning the
machine around or pulling it towards you.

Risk of stumbling!

Objects hidden in the turf (lawn sprinkler
systems, posts, water valves, foundations,
electrical wires, etc.) must be avoided.
Never run over any such foreign objects.

If the cutting tool or the machine hits an
obstacle or a foreign object, the motor
must be switched off, the safety plug
disconnected and an inspection performed
by a specialist.

Beware of the cutting tool
running on for several seconds
before coming to a standstill.

Switch off the motor,

– if tilting of the machine is necessary

when transporting over surfaces other
than grass,

– when pushing the machine to and from

mowing areas,

– before removing the grass catcher box,

– before adjusting the cutting height.

Switch off the motor, disconnect

the safety plug and ensure that
the cutting tool has come to a complete
standstill

– before removing the battery;

– before leaving the machine unattended;

– before transporting, lifting, or carrying

the machine;

– before remedying blockages, including

those in the discharge chute;

– before you check, clean or carry out

work on the machine (e.g. folding down
or adjusting the handlebar);

– if the cutting tool has hit a foreign object.

The cutting tool needs to be checked for
possible damage. The machine must
not be operated with a damaged or bent
blade shaft or motor shaft. Risk of

injury through defective parts!

– if the machine begins to vibrate

excessively. In this case, the complete
machine, in particular the cutting tool,
must be checked for possible damage
and loose parts. Damaged parts must
be replaced prior to further use, loose
parts must be fastened/tightened.

Risk of injury!

Strong vibration is normally an
indication of a fault.
In particular, the machine must not
be operated with a damaged or
bent blade shaft or mowing blade.
If you do not have the appropriate
expertise, have the necessary
repairs carried out by a specialist
dealer (STIHL recommends STIHL
specialist dealers).

4.10 Maintenance, cleaning, repairs and storage

Before performing work on the machine,
before adjusting or cleaning

● Switch off the motor

● Remove the safety plug

● Remove the battery if

necessary

Allow the machine to fully cool down
before storing it in enclosed places,
performing maintenance on it or cleaning
it.

Cleaning:

The complete machine must be cleaned
thoroughly following use. (Ö 13.2)

Remove accumulated clipping deposits
using a stick. Clean the underside of the
mower with water and a brush.

12

0478 131 8327 B - EN

Never use high-pressure cleaners and do
not clean the machine under running water
(e.g. using a garden hose).
Do not use aggressive cleaning agents.
These can damage plastics and metals,
impairing the safe operation of your STIHL
machine.

In order to prevent overheating and fire
hazards, keep the areas around the air
vents on the top of the machine (between
the motor hood and housing) and the
machine underside (in the discharge
chute) free from dirt (e.g, grass, straw,
moss, leaves or escaping grease).

Maintenance operations:

Only maintenance operations described in
this instruction manual may be carried out.
Have all other work performed by a
specialist dealer.
If you do not have the necessary expertise
or auxiliary equipment, please always
contact a specialist dealer.
STIHL recommends that you have
maintenance operations and repairs
performed exclusively by a STIHL
specialist dealer.
STIHL specialist dealers regularly attend
training courses and are provided with
technical information.

Only use tools, accessories or
attachments approved for this machine by
STIHL or technically identical parts.
Otherwise, there may be a risk of
accidents resulting in personal injury or
damage to the machine. If you have any
questions, please consult a specialist
dealer.

The characteristics of original STIHL tools,
accessories and spare parts are optimally
adapted to the machine and the user's
requirements. Genuine STIHL spare parts
can be recognised by the STIHL spare

parts number, by the STIHL lettering and,
if present, by the STIHL spare parts
symbol. On smaller parts, only the symbol
may be present.

Always keep warning and information
stickers clean and readable. Damaged or
missing stickers must be replaced by new,
original plates from your STIHL specialist
dealer. If a component is replaced with a
new component, ensure that the new
component is provided with the same
stickers.

Regularly check that the mowing blade is
securely fastened and is not damaged or
worn.

Only perform work on the cutting unit when
wearing protective gloves (Ö 4.2) and
exercising extreme care.

Ensure that all nuts, pins and screws (in
particular the blade fastening screw) are
securely tightened so that the machine is
in a safe operating condition.

Check the complete machine and the
grass catcher box for wear or damage on
a regular basis, particularly before
extended periods when the machine is not
in use (e.g. over winter). For safety
reasons, worn or damaged parts must be
replaced immediately to ensure that the
machine is always in a safe operating
condition.

Components or guards that are removed
for maintenance operations must be
properly reinstalled immediately.

4.11 Storage for prolonged periods without operation

Store the cooled machine, the battery and
the safety plug separately from each other
in a dry and locked room that is
inaccessible to children.

Ensure that the machine is protected from
unauthorised use (e.g. by children).

Thoroughly clean the machine before
storage (e.g. winter break).

Store the machine in good operational
condition.

Store the machine on a level surface so
that it cannot unintentionally roll away.

4.12 Disposal

Ensure that old machines (lawn mower,
battery, charger, accessories) are properly
disposed of. Render the lawn mower
unusable prior to disposal. In order to
prevent accidents, ensure that you remove
the safety plug and the electric cable from
the switch to the motor.

Risk of injury due to the cutting tool!

Always store an old machine in a safe
place prior to scrapping. Ensure that the
machine and the cutting tool are kept out
of the reach of children.

Batteries must be disposed of separately
from the machine. Ensure that batteries
are discharged prior to disposal (e.g. by
running the motor) and that they are
disposed of safely and in an
environmentally friendly manner.

EN

0478 131 8327 B - EN

13

5. Description of symbols

Caution!

Read the instruction man­ual before initial use.

Risk of injury!

Keep other persons out of
the danger area.

Caution –
sharp cutting blades!

The cutting blades run on
after the motor has been
switched off. Remove the
locking device (safety plug)
before performing mainte­nance work.

RMA 339:

Start the motor.

Battery is overheated.
Charging starts after the
cooling-down period or
the battery can only be
used after the cooling­down period.

The battery is faulty and
must be replaced.

14

RMA 339 C:

Start the motor.

RMA 339 C:

Switch off the motor.

0478 131 8327 B - EN

6. Standard equipment

EN

Item Designation Qty.
A Basic unit 1
B Upper part of grass catcher

box

C Lower part of grass catcher

box

D Stud 2
M Safety plug 1
N Charger
O Battery

x Instruction manual 1

0478 131 8327 B - EN

RMA 339 C:

E Sleeve 1

1

F Bolt 1
G Washer 2

1

H Nut 1

RMA 339:

I Flat head bolt 2
J Cable guide 1
K Rotary handle 2

The standard equipment may vary
depending on the country where
sold and version type.

15

7. Preparing the machine for operation

7.1 General points

Risk of injury.

Observe the safety instructions in
the section "For your safety" (Ö 4.).

Remove the safety plug,

particularly before
performing any work on the lawn
mower (Ö 9.2).

● Place the machine on level, firm ground
when performing all the operations
described.

The batteries are charged to
approx. 30% on delivery. They must
be therefore be charged before
being used for the first time.

● Charging the battery (Ö 8.4).

7.2 Installing the mono handlebar (RMA 339 C)

● 4 Insert nut (H) into the bracket as

shown.

● 5 Insert bolt (F) from the outside

inwards through the bores in
handlebar (1) and in bracket (2).

● 6 Tighten bolt (F).

Tightening torque:

18 - 22 Nm

Installing the electric cable:

16

● 1 Insert sleeve (E) in the bore on

handlebar (1).

● 2 Fit two washers (G) with the convex

side facing inwards onto the sleeve.

● 3 Hold sleeve (E) and washers (G)

and insert together with handlebar (1)
into bracket (2).

● Insert the electric cable as shown into
cable guide (3),

● press into the holder on handlebar (4)
and

● fasten to the handlebar using cable
clip (5).

0478 131 8327 B - EN

7.3 Installing the dual handlebar (RMA 339)

Installing cable clip:

● Install cable clip (4) on the upper
handlebar. Insert electric cable (1) as
shown.

● Close tab (5) and allow it to engage.
Distance between the cable clip and
switch:

25 - 27 cm

7.4 Assembling the grass catcher box

EN

● Push stud (D) through the bores
provided from the inside.

Installing the upper handlebar:

● 1 Insert flat head bolt (I) through cable

guide (J) and attach electric cable (1).

● 2 Fit dual handlebar (2) onto both

lower handlebar sections (3).

● 3 Insert flat head bolts (I) – on right

with cable guide (J), on left without –
through the bores from the inside
outwards.

● 4 Tighten with rotary handles (K).

0478 131 8327 B - EN

● Fit upper part of grass catcher box (B)
onto lower part of grass catcher
box (C). Ensure correct location in the
guides.

● Allow upper part of grass catcher
box (B) to engage in the lower part of
the grass catcher box using slight
pressure.

● Attach the grass catcher box (Ö 9.7).

17

8. Battery and charger

8.1 General

The RMA 339, RMA 339 C lawn mowers
are operated with rechargeable STIHL AK
type lithium-ion batteries only.

The batteries supplied are optimally
adapted to the intended purpose,
however, all STIHL AK type batteries can
be used.

The lawn mower electronics exchange
data with the installed battery and adapt
the power of the electric motor to the
relevant capacity.

8.2 Connecting the charger to the mains

8.3 Removing/inserting the battery

● Remove the safety plug
(Ö 9.2) and hold the battery
compartment cover in the
open position.

● Insert mains plug (1) in socket (2).

● After connection of the charger to the

power supply, a self-test is performed.
During this process, LED (3) on the
charger illuminates green for approx.
1 second, then red and then
extinguishes again (Ö 8.6).

18

Removing the battery:

● Push locking lever (1) towards the
battery and remove battery (2)
upwards.

0478 131 8327 B - EN

Inserting the battery:

● Insert battery (2) as shown into the
battery compartment as far as it will go
applying slight pressure – a clicking
sound will be heard.

8.4 Charging the battery

The charging time depends on various
influencing factors such as e.g. the
temperature of the battery and the ambient
temperature. The actual charging time
may differ from the specified charging
time. Please refer to
www.stihl.com/charging-times for
charging times.

Once the battery has been inserted
in the charger, charging starts
automatically. When the battery is
fully charged, the charger switches
off automatically.

The battery and the charger heat
up during charging.

● Insert battery (1) into the guides on
charger (2) and push it in as far as it will
go.
The LED on charger (3) illuminates
green.
The LEDs on battery (4) illuminate
green to indicate the charge state.

● When the LED on charger (3) and the
LEDs on battery (4) no longer
illuminate, remove the mains plug from
the socket.
The battery is fully charged.

● Remove the battery from the charger
and insert it in the battery compartment.
(Ö 8.3)

8.5 LEDs on the battery

EN

● Remove the battery from the battery
compartment. (Ö 8.3)

● Connect the charger to the mains.
(Ö 8.2)

0478 131 8327 B - EN

Displaying the charge state:

● Press button (1). The LEDs illuminate
green for approx. 5 seconds to indicate
the charge state.

● If the right LED flashes green, charge
the battery. (Ö 8.4)

Faults:

The LEDs indicate lawn mower or battery
faults. They can illuminate or flash red for
this purpose.

19

4 LEDs flash red:
The battery is faulty.

1 LED illuminates red:
The battery is too warm or too
cold.

3 LEDs illuminate red:
The lawn mower is
overheated

3 LEDs flash red:
The lawn mower is faulty.

● Remedy the faults. (Ö 19.)

The LED illuminates green
and the LEDs on the battery
illuminate or flash green:
The battery is charging.

The LED flashes red:
There is no electrical contact
between the battery and the
charger, or there is a fault in
the battery or in the charger.

If the LED illuminates green and 1 LED on
the battery illuminates red, the battery is
too warm or too cold.

● Remedy the faults. (Ö 19.)

9. Controls

8.6 LED on the charger

LED (3) indicates the charger status. It can
illuminate green or flash red.

20

9.1 Battery compartment

The battery compartment must
always remain closed during
operation.

Opening the battery compartment:

● Press in retaining tab (1) slightly and
open cover (2) rearwards.

Closing the battery compartment:

● Fold down cover (2) and ensure that
retaining tab (1) engages.

9.2 Safety plug

The lawn mower can only be operated
when the safety plug is inserted in the
socket behind the battery compartment.

Risk of injury!

The safety plug must be
removed prior to
performing any work on the
machine, particularly before
transport, maintenance or cleaning
work as well as before inspecting
the machine. (Ö 4.)

0478 131 8327 B - EN

● Lift up battery compartment cover (1) at
the front and hold in the open position.
(Ö 9.1)

● Removing:

Remove safety plug (2) from socket (3)
and keep separately from the lawn
mower.

Inserting:

Press safety plug (2) into socket (3) as
far as it will go.

● Close battery compartment cover (1).

9.3 Eco mode switch

The eco mode switch that increases
battery running time is located in the
battery compartment. (Ö 10.2)

Switching on eco mode:

● Move switch to position I.

Switching off eco mode:

● Move switch to position 0.

9.4 Adjusting the mono handlebar (RMA 339 C)

Danger of pinching!

When operating the detent lever,
always hold the upper handlebar at
its highest point with one hand.
Never place your fingers between
the handlebar and bracket (above
and below the detent lever).

Folding down the handlebar:

Transport position (for cleaning, for

space-saving transport and for storage of
the machine):

● Hold upper handlebar (2) at its highest
point with one hand and lift (relieve
load) slightly.

● Press detent lever (1) downwards and
hold.

● Fold handlebar (2) down forwards,
ensuring that the electric cable is not
damaged.

Working position (to push machine):

● Fold handlebar (2) up rearwards and
ensure that the handlebar is fully
engaged.

Height adjustment:

The height of the mono handlebar can be
adjusted to 2 levels:

● Hold upper handlebar (2) at its highest
point with one hand and lift (relieve
load) slightly.

● Press detent lever (1) downwards and
hold.

● Move handlebar (2) into the required
position.

● Release detent lever (1) and ensure
that the handlebar is again fully
engaged.

9.5 Folding down the dual handlebar

(RMA 339)

Danger of pinching!

The upper handlebar can fold down
when the rotary handles are
released. Therefore hold the upper
handlebar with one hand at its
highest point when unscrewing the
rotary handles.

EN

0478 131 8327 B - EN

21

Transport position (for cleaning, for
space-saving transport and for storage of
the machine):

● Loosen rotary handles (1) until they turn
freely.

● Fold down upper handlebar (2)
forwards.

Working position (to push machine):

● Fold up upper handlebar (2) rearwards
and hold with one hand.

● Tighten rotary handles (1). Ensure
correct position of cable guide (3).

9.6 Central cutting height adjustment

Six cutting heights can be selected.

Level S = 20 mm

Level 5 = 70 mm

In order to prevent damage, the
lowest cutting height must only be
used on even lawns (without
bumps).

Setting the cutting height:

● 1 Push height adjustment lever (1)

away from the lawn mower slightly until
the lever is released from locating
lugs (2).

● 2 Raise or lower the lawn mower.

Increasing the cutting height: Raise
the lawn mower using height
adjustment lever (1) (push lever
forwards).

Decreasing the cutting height:

Lower lawn mower using height
adjustment lever (1) (push lever
rearwards).

● Push height adjustment lever (1)
towards the lawn mower slightly until
locating lugs (2) engage in the lever.
The selected cutting height can be read
off at front locating lug (3).

9.7 Grass catcher box

Attaching:

● Open discharge flap (1) and hold it
open.

● Attach grass catcher box (2) to
mountings (4) on the rear of the
machine by means of locating lugs (3).

● Close discharge flap (1).

Detaching:

● Open discharge flap (1) and hold it
open.

● Lift grass catcher box (2) and remove
rearwards.

● Close discharge flap (1).

22

0478 131 8327 B - EN

9.8 Level indicator

The upper part of the grass catcher box
features a level indicator (1).

The flow of air that is created by the rotary
movement of the mowing blade and is
responsible for filling the grass catcher box
raises level indicator (2):
The grass catcher box is filled with
clippings.

When the grass catcher box is full, this
flow of air is reduced and level indicator (3)
drops:

● Empty the filled grass catcher box
(Ö 12.4).

10. Notes on working with the machine

10.1 General

To ensure a perfect, thick lawn, mow
regularly and keep the grass short.

Do not cut the lawn too short in hot, dry
conditions as it will dry out or burn in the
sun and become unsightly.

The cutting pattern will be better with a
sharp blade than with a blunt one; the
blade should therefore be sharpened
regularly (STIHL specialist dealer).

10.2 Cutting performance

The cutting performance (battery running
time) depends on the quality of the grass
and the selected cutting height. The
cutting performance is enhanced by the
following measures:

– Mowing the lawn more frequently

– Increasing the cutting height

– Reducing speed of propulsion

– Allowing the lawn to dry before mowing.

If required, additional STIHL lithium ion
batteries can be purchased (special
accessories).

Eco mode:

The lawn mower features an
eco mode, which improves its
energy efficiency and therefore
its cutting performance.

Eco mode can be switched on and off
using the switch in the battery
compartment. (Ö 9.3)

Function:

The speed of the motor is reduced
automatically when less power is required.
If more power is required, the speed is
increased again within a fraction of a
second.

10.3 Working area for operator

● For safety reasons, the operator must
stay within the working area behind the
handlebar when the motor is running.
Always observe the safety distance
provided by the handlebar.

● The lawn mower must only be operated
by one person. Other persons must
keep out of the danger area. (Ö 4.)

EN

0478 131 8327 B - EN

23

10.4 Correct motor load

Do not switch the lawn mower on in tall
grass. Select a higher cutting height
setting if the motor is difficult to start.

The lawn mower load must never cause
the motor speed to drop significantly.

If the speed drops when mowing tall grass,
select a higher cutting height setting
and/or reduce the speed of propulsion.

When eco mode is switched on, the
speed is reduced automatically
when less power is required.
(Ö 10.2)

10.5 If the mowing blade blocks

Switch off the motor immediately and
disconnect the safety plug. Then eliminate
the cause of the fault.

10.6 Thermal motor overload protection

The electronics switch off the motor if it
becomes overloaded during operation.
Three red LEDs in the battery illuminate if
a thermal overload occurs. (Ö 8.5)

Causes for an overload:

– blunt mowing blade

– mowing excessively high grass or

cutting height adjusted too low

– excessive rate of feed

– inadequate cleaning of the cooling air

guide (inlet slots)

Recommencing operation

Resume normal operation of the machine
following a cooling period of up to 10 min
(depending on the ambient temperature).
(Ö 12.)

11. Safety devices

The machine is equipped with several
safety devices for safe operation and for
the prevention of improper use.

Risk of injury!

If a safety device is found to be
defective, the machine must not be
operated. Consult a specialist
dealer; STIHL recommends STIHL
specialist dealers.

11.1 Safety plug

The motor can only be switched on when
the safety plug is inserted (Ö 9.2).

11.2 Safety devices

The lawn mower is equipped with safety
devices, which prevent inadvertent contact
with the mowing blade and with ejected
clippings.
These include the housing, discharge flap,
grass catcher box and correctly installed
handlebar.

11.3 Two-hand operation

The motor can only be switched on by
pressing and holding the ON button with
the right hand and then pulling the
motorstop lever to the handlebar with the
left hand.

11.4 Motor run-down brake

When the motorstop lever is released, the
mowing blade comes to a complete
standstill in less than three seconds.

An integrated motor run-down brake
shortens the run-down time until the blade
stops.

Measuring run-down time

Following motor start-up, the blade rotates
and a wind noise is audible. The run-down
time corresponds to the duration of the
wind noise after the motor stops. This can
be measured using a stopwatch.

12. Operating the machine

12.1 Preparatory measures

Risk of injury!

Observe the safety instructions in
the section "For your safety". (Ö 4.)

● Charge the battery and insert it into the
battery compartment. (Ö 8.4)

● Insert the safety plug. (Ö 9.2)

12.2 Switching the lawn mower on

Do not switch the lawn mower on in
tall grass. Select a higher cutting
height setting if the motor is difficult
to start.

24

0478 131 8327 B - EN

12.3 Switching the lawn mower off

EN

● 1 Press and hold ON button (1).

● 2 Pull motorstop lever (2) to the

handlebar and hold.

● ON button (1) can be released once
motorstop lever (2) is pulled.

0478 131 8327 B - EN

● Release motorstop lever (1). Motor and
mowing blade come to a stop after a
short run-down time.

12.4 Emptying the grass catcher box

Risk of injury!

The motor must be stopped for
safety reasons before removing the
grass catcher box.

● Detach the grass catcher box. (Ö 9.7)

● Open the grass catcher box at tab (1).

Fold up upper part of grass catcher
box (2) and hold. Fold the grass catcher
box rearwards and empty the clippings.

● Close the grass catcher box.

● Attach the grass catcher box. (Ö 9.7)

25

13. Maintenance

13.1 General

Risk of injury!

Observe the safety instructions in
the section "For your safety" (Ö 4.).

Remove the safety plug,

particularly before
performing any work on the lawn
mower (Ö 9.2).

Annual service by the specialist dealer:

The lawn mower should be inspected once
annually by a specialist dealer. STIHL
recommends STIHL specialist dealers.

13.2 Cleaning the machine

Maintenance interval:
After each use

Treating the machine carefully will protect
it against damage and extend its service
life.

● Remove the battery (Ö 8.3)

● Detach the grass catcher box (Ö 9.7)

Risk of injury!

Before tilting the mower, place it on
firm, level, flat ground. The machine
may tip over when working on it in
the cleaning position. Always stand
to the side of the machine. Never
work in front of or behind the
mower.

Cleaning position RMA 339 C:

● Stand to the right of the machine to tilt it
upwards.

● Set the upper handlebar to the lowest
position (as far as the stop, the detent
lever does not engage in this position).
(Ö 9.4)

● Open discharge flap (1) with your right
hand and hold it open.

● Hold the bracket with your left hand as
shown and hold the discharge flap
open. At the same time, press detent
lever (2) with your thumb and hold it
down.

● Hold the machine with your right hand
on the front handle and tilt it rearwards
slowly until the handlebar is in contact
with the ground as shown.

● Release discharge flap (1) and detent
lever (2) and check that the machine is
stable.

Cleaning position RMA 339:

● Fold down the dual handlebar (Ö 9.5)

● Tilt the lawn mower upwards and set

down on lower handlebars (3).

Notes on cleaning:

● Clean off dirt using little water, with a
brush or with a cloth. In particular, also
clean the mowing blade. Never spray
water on motor components, seals,
bearing points or electrical components
such as batteries or switches.

● First, remove accumulated clippings
using a stick.

● Remove dirt from the cooling air guide
(inlet slots) between the motor hood
and the lower housing to ensure that
the motor is adequately cooled.

26

0478 131 8327 B - EN

● If necessary, use a special cleaner
(e.g. STIHL special cleaner).

13.3 Electric motor and wheels

The electric motor is maintenance-free.

The wheel bearings are maintenance-free.

13.4 Battery

Maintenance interval:
Before each use

● Clean the battery with a damp cloth.

● Visually check that the battery is

undamaged. Batteries with identifiable
damage (e.g. cracks or escaping fluid),
must not be used.

13.5 Charger

Maintenance interval:
Before each use

● Remove mains plug from socket.

● Clean the charger with a damp cloth.

● Clean the electric contacts in the

charger with a paintbrush or a soft
brush.

● Observe the instructions in the charger
instruction manual.

13.6 Checking blade wear

Maintenance interval:
Before each use

Risk of injury!

Blades are subjected to differing
degrees of wear depending on the
location and duration of use. If you
use the machine on sandy ground
or use it frequently under dry
conditions, the blade will be
subjected to greater loads and will
wear more quickly than average. A
worn blade may break off and
cause serious injuries. The
instructions for blade maintenance
must therefore always be observed.

● Set the lawn mower onto its back in the
cleaning position. (Ö 13.2)

● Clean mowing blade (1).

EN

● Use a slide calliper to measure the

blade thickness A at 5 points at least.
In particular, minimum thickness must
also be ensured in the area of the blade
wings.

● Check the blade width B in the area
marked in grey X at 3 points at least
using a slide calliper.

Wear limits:

Blade thickness A: 1,6 mm

Blade width B: 56 mm

The blade must be replaced

– if it is damaged (notches, cracks),

0478 131 8327 B - EN

27

– if the measured values are achieved at

one or more places or are outside the
permissible limits.

13.7 Removing and installing the mowing blade

In order to prevent damage to the
blade fastening screw, use a
suitable socket (22 mm) for
loosening and tightening.

1 Removing:

● Use a suitable wooden block (1) to hold
mowing blade (2) in place.

● Unscrew blade fastening screw (3) and
remove mowing blade (2).

2 Installing:

Risk of injury!

The mowing blade must only be
installed as shown, in particular
tabs (6) must point downwards.
Always replace blade fastening
screw (3) when replacing the
mowing blade. The specified torque
when tightening the blade fastening
screw must be strictly observed, as
the secure attachment of the cutting
tool depends on this.

● Clean the blade contact surface and
blade bushing.

● Install mowing blade (2) with the curved
wings pointing upwards. Locating
lugs (4) must be located in recesses (5)
of the mowing blade.

● Use a suitable wooden block (1) to hold
mowing blade (2) in place.

● Apply Loctite 243 to the thread of blade

fastening screw (3).

● Tighten blade fastening screw (3).
Tightening torque:

10 - 15 Nm

13.8 Sharpening the mowing blade

If you do not have the necessary expertise
or auxiliary equipment, you should have
the blade sharpened by a specialist dealer
(STIHL recommends STIHL specialist
dealers).

Operation of the machine is impaired in the
case of an incorrectly sharpened mowing
blade (incorrect sharpening angle,
imbalance, etc.), the cutting performance
(battery running time) may be reduced and
the noise emissions increased.

Sharpening instructions

● Remove the mowing blade. (Ö 13.7)

● Cool the mowing blade during

sharpening, e.g. with water.
The blade must not be allowed to
display blue colouring, as this would
reduce its cutting quality.

● Sharpen blades evenly to prevent
vibration due to imbalance.

● Observe a sharpening angle of 30°.

● Observe the wear limits. (Ö 13.6)

13.9 Storage (winter break)

Store the machine in a dry and locked
place that is generally free of dust. Make
sure that it is kept out of the reach of
children.

28

0478 131 8327 B - EN

Only store the lawn mower in good
operating condition, fold down the
handlebar if necessary.

Keep all nuts, pins and bolts tightly
fastened, replace danger signs and
warnings on the machine that have
become illegible, check the entire machine
for wear and damage. Replace all worn or
damaged parts.

Any machine faults must be completely
remedied prior to storage.

Note the following points when storing the
lawn mower for long periods (winter
break):

● Clean all external parts of the machine
with care.

● Thoroughly lubricate/grease all moving
parts.

Storing the battery:

● Remove battery from the battery
compartment or out of the charger.

● Clean the battery.

● Store the battery in a dry locked place

that is generally free of dust in
electrically non-conductive packaging.
Ensure that batteries are protected from
unauthorised use (e.g. by children).

● Do not store spare batteries unused –
use batteries alternately.

● For optimum battery service life,
observe the permissible temperature
range (Ö 18.1) and store the battery at
a charge state between 20% and 40%
(2 LEDs illuminated green).

Storing the charger:

● Remove the battery and remove the
mains plug from the socket.

● Clean the charger.

● Store the charger separately from the

battery in a dry, locked and dust-free
room. Ensure that it is protected from
unauthorised use (e.g. by children).
Do not suspend the charger from the
electric cable.

14. Transport

14.1 Carrying and securing the lawn mower

Risk of injury!

Observe the safety instructions in
the section "For your safety" (Ö 4.).

Remove the safety plug,

particularly before
performing any work on the lawn
mower (Ö 9.2).

Exercise special care when
transporting lithium ion batteries
(Ö 4.3).

Carrying the machine:

EN

● Only lift the lawn mower by transport
handles (1, 2). Always ensure sufficient
distance between the mowing blade
and your body, particularly your feet
and legs.

0478 131 8327 B - EN

29

● Carry the lawn mower using both
hands, with one hand at upper transport
handle (2) and the other hand at lower
transport handle (1),

or

● carry the lawn mower with one hand at
upper transport handle (2).

Securing (lashing) the machine:

● Secure the lawn mower on the load
floor using suitable fastening materials.

● Attach ropes or straps at handles (1, 2).

14.2 Transporting the battery

● Before transport, it must be ensured
that the battery is in good operating
condition. (Ö 4.3)

● Transport the battery either in the
machine or in appropriate safe
packaging.

● Observe the instructions in the "For
your Safety – Transporting the battery".
(Ö 4.7)

The battery is subject to the requirements
for transporting hazardous goods. The
battery is classed as a UN 3480 (lithium­ion battery) and has been tested in
accordance with the UN Manual of Tests
and Criteria, Part III, subsection 38.3.

Please refer to www.stihl.com/safety-data­sheets for transport instructions.

15. Minimising wear and preventing damage

Important information on maintenance
and care of the product group

Lawn mower, manually operated and
battery-powered (STIHL RMA)

STIHL assumes no liability for material or
personal damage caused by the non­observance of information contained in the
operating instructions, in particular with
regard to safety, operation and
maintenance, or which arise through the
use of unauthorised attachment or spare
parts.

Please always observe the following
important information for the prevention of
damage or excessive wear to your STIHL
machine:

1. Wearing parts

Some parts of the STIHL machine are
subject to normal wear even when used
properly and must be replaced in due time
depending on type and duration of use.

These include:

–Blade

– Grass catcher box

–Battery

2. Compliance with the information in
this instruction manual

The STIHL machine must be used,
maintained and stored with the care
described in this instruction manual. Any
damage caused by non-compliance with
the safety, operating and maintenance
instructions is the sole responsibility of the
user.

This applies in particular to:

– Incorrect electrical connection

(voltage).

– Product modifications not approved by

STIHL.

– The use of tools or accessories which

are not approved or suitable for the
machine, or are of inferior quality.

– Improper use of the product.

– Use of the product for sporting or

competitive events.

– Resultant damage due to continued use

of the product with defective
components.

3. Maintenance operations

All operations listed in the section
"Maintenance" must be performed
regularly.

If these maintenance operations cannot be
carried out by the user, a specialist dealer
must be commissioned to perform them.

STIHL recommends that you have
maintenance operations and repairs
performed exclusively by a STIHL
specialist dealer.

STIHL specialist dealers regularly attend
training courses and are provided with
technical information.

30

0478 131 8327 B - EN

If these operations are neglected, faults
may arise which are the responsibility of
the user.

These include:

– damage to the drive motor as a result of

inadequate cleaning of the cooling air
guide (inlet slots),

– corrosive and other resultant damage

caused by incorrect storage,

– damage to the machine through the use

of inferior-quality spare parts,

– damage due to untimely or inadequate

maintenance or damage due to
maintenance or repair work not
performed in the workshops of
specialist dealers.

16. Environmental protection

Lawn clippings should be
composted and not disposed of
in household waste.

The machine, its packaging and
accessories are all produced from
recyclable materials and must be disposed
of accordingly.

By disposing of materials separately and in
an environmentally friendly manner,
recyclable waste can be re-used. For this
reason, the machine should be disposed
of for recycling at the end of its useful life.
Improper disposal may be harmful to
health and pollute the environment. Pay
particular attention to the information in the
section "Disposal" during disposal.
(Ö 4.12)

Consult your recycling centre or your
specialist dealer for information on the
proper disposal of waste products.

Always dispose of batteries
properly – observe local
regulations. Do not dispose of
batteries with domestic waste,

but hand it in to a specialist
dealer or at a hazardous waste collection
point.

17. Standard spare parts

Mowing blade:
6320 702 0140

Blade fastening screw:
6310 710 2800

The blade fastening screw must be
renewed each time the blade is
replaced. Spare parts are available
from a STIHL specialist dealer.

18. Technical specifications

RMA 339.0, RMA 339.0 C

Serial number 6320
Type E C mo tor
Voltage 36 V
Power input 900 W
Protection class III
Type of protection IPX 1
Cutting utilities Cutter bars
Cutting width 37 cm
Speed of cutting

utilities 3350 rpm
Cutter bar drive Permanent
Tightening torque for

blade fastening
screw 10 - 15 Nm

Cutting height 20 - 70 mm
Grass catcher box 40 l

RMA 339.0, RMA 339.0 C

Wheel diameter
(front) 150 mm

Wheel diameter
(rear) 180 mm

Sound emissions:

In accordance with Directive 2000/14/EC:
Guaranteed sound

power level L

WAd

90 dB(A)
In accordance with Directive 2006/42/EC:
Sound pressure level

at workplace L
Uncertainty K

pA

pA

76 dB(A)

2 dB(A)

RMA 339.0

Length 122 cm
Width 42 cm
Height 107 cm
Weight (without

battery) 14 kg

Hand-arm vibrations:

Specified vibration characteristic in
accordance with EN 12096:

Measured value a
Uncertainty K

hw

hw

1,60 m/sec

0,80 m/sec

2

2

Measurement in accordance with
EN 20643

RMA 339.0 C

Length 135 cm
Width 43 cm
Height 110 cm
Weight (without

battery) 16 kg

Hand-arm vibrations:

Specified vibration characteristic in
accordance with EN 12096:

Measured value a
Uncertainty K

hw

hw

1,60 m/sec

0,80 m/sec

2

2

EN

0478 131 8327 B - EN

31

RMA 339.0 C

Measurement in accordance with
EN 20643

18.1 STIHL AK battery

Battery technology Lithium-ion
Voltage 3 6 V
Capacity in Ah See rating plate
Energy content in

Wh See rating plate
Weight in kg See rating plate
Permissible tempera-

ture range -10°C to +50°C

This symbol indicates the
number of cells and the energy
content according to the cell
manufacturer's specifications.
The available energy content is
lower in practice.

18.2 STIHL charger AL 101

Rated voltage 220-240 V,

50-60 Hz
Nominal output 75 W
Charge current 1.5 A
Permissible tempera-

ture range +5°C to +40°C

Protection class II. The charger
housing features double
insulation to the connected
mains.

Please refer to www.stihl.com/charging­times for charging times.

19. Troubleshooting

# If necessary, contact a specialist

dealer; STIHL recommends STIHL
specialist dealers.

Fault:

Motor not starting

Possible cause:

– Battery charge state too low – 1 LED

flashes green on battery

– Battery too cold/too warm – 1 LED

illuminates red on battery

– Battery fault – 4 LEDs flash red on

battery

– Lawn mower is too warm – 3 LEDs

illuminate red on battery

– Lawn mower fault – 3 LEDs flash red on

battery
– ON button not pressed
– Safety plug is not inserted
– Electrical connection interrupted

between lawn mower and battery
– Motor is overloaded because grass is

too tall or too wet
– Humidity in machine and/or battery
– Mower housing is blocked
– Fuse in safety plug is defective

Remedy:

– Recharge battery (Ö 8.4)
– Warm up battery or allow it to cool down
– Remove and re-insert battery; consult

specialist dealer if necessary (#)
– Allow lawn mower to cool down
– Clean electric contacts in battery

compartment (Ö 13.2); consult

specialist dealer if necessary (#)
– Press ON button (Ö 12.2)
– Insert safety plug (Ö 9.2)

– Insert battery correctly (Ö 8.3); clean

electric contacts in battery
compartment (Ö 13.2)

– Do not switch on motor in high grass,

adapt cutting height (Ö 9.6)

– Remove battery and dry; clean and/or

dry battery compartment (Ö 8.3)
– Clean mower housing (Ö 13.2)
– Replace safety plug (#)

Fault:

Motor stops during operation

Possible cause:

– lawn mower overheated – 3 LEDs

illuminate red on battery
– Electrical fault
– Safety plug incorrectly inserted
– Machine overloaded due to mowing

grass that is too long or too wet
– Lawn mower fault

Remedy:

– Allow lawn mower to cool down
– Remove and re-insert battery (Ö 8.3)
– Insert safety plug (Ö 9.2)
– Adapt cutting height and mowing speed

to mowing conditions (Ö 9.6)
– Repair lawn mower (#)

Fault:

Excessive vibration during operation

Possible cause:

– Blade fastening screw is loose
– Blade is not balanced

Remedy:

– Tighten blade fastening screw (Ö 13.7)
– Re-sharpen (balance) or replace blade

(Ö 13.8)

32

0478 131 8327 B - EN

Fault:

Poor cut, lawn turning yellow

Possible cause:

– Mowing blade is blunt or worn,
– Rate of feed is too high in relation to the

cutting height

Remedy:

– Re-sharpen or replace mowing blade

(Ö 13.8)

– Reduce rate of feed and/or select

correct cutting height (Ö 9.6)

Fault:

Problems switching machine on or
deteriorating motor power.

Possible cause:

– Battery discharged
– Mowing grass that is too long or too wet
– Mower housing is blocked
– Mowing blades are blunt or worn

Remedy:

– Recharge battery (Ö 8.4)
– Adapt cutting height and mowing speed

to mowing conditions (Ö 9.6)
– Clean mower housing (Ö 13.2)
– Re-sharpen or replace mowing blade

(Ö 13.8)

Fault:

Machine not switching to eco mode

Possible cause:

– Mower housing is blocked
– Mowing blade is blunt, worn or

damaged

Remedy:

– Clean mower housing (Ö 13.2)
– Re-sharpen or replace mowing blade

(Ö 13.7)

Fault:

Discharge chute blocked

Possible cause:

– Mowing blade is worn
– Mowing grass which is too long or too

wet

Remedy:

– Replace mowing blade (Ö 13.8)
– Adapt cutting height and mowing speed

to mowing conditions (Ö 9.6)

Fault:

Operating time too short

Possible cause:

– Battery not fully charged
– Mowing grass that is too long or too wet
– Mower housing is blocked
– Mowing blades are blunt or worn
– Battery has exceeded service life

Remedy:

– Recharge battery (Ö 8.4)
– Adapt cutting height and mowing speed

to mowing conditions (Ö 9.6)
– Clean mower housing (Ö 13.2)
– Re-sharpen or replace mowing blade

(Ö 13.8)
– Replace battery (#)

Fault:

Battery gets stuck when inserting into
battery compartment

Possible cause:

– Guides or electric contacts in battery

compartment dirty

Remedy:

– Clean guides and/or electric contacts in

battery compartment (Ö 13.2)

Fault:

Battery is not charged although the green
LED on the charger illuminates green

Possible cause:

– Battery too cold or overheated (one red

LED illuminates on battery)

Remedy:

– Warm up or cool down the battery

(Ö 8.4). Store the charger in a closed,
dry place at a temperature of between
+5°C and +40°C.

Fault:

Charging fails to start after inserting
battery into charger

Possible cause:

– Battery too cold/too warm – 1 LED

illuminates red on battery

– No electrical contact between charger

and battery

– Charger power supply faulty

Remedy:

– Leave battery inserted in charger

Charging starts automatically as soon
as permissible temperature range is

reached.
– Remove and re-insert battery (Ö 8.3)
– Connect charger to mains (Ö 8.2)
– Check mains power supply
– Check charger, replace if necessary

(#)

Fault:

Battery is not charged, no LED illuminates

Possible cause:

– No electrical contact between charger

and battery

EN

0478 131 8327 B - EN

33

– Charger power supply faulty

Remedy:

– Remove battery from battery

compartment and reinsert (Ö 8.3)
– Connect charger to the mains (Ö 8.2)
– Check mains power supply
– Check charger, replace if necessary

(#)

Fault:

LED on charger flashes red

Possible cause:

– No electrical contact between charger

and battery
– Battery defective (4 LEDs on the

battery flash red for approx. 5 seconds)
– Charger defective

Remedy:

– Remove battery from battery

compartment and reinsert (Ö 8.3)
– Check battery, replace if necessary (#)
– Check charger, replace if necessary

(#)

20. Service schedule

20.1 Handover confirmation

20.2 Service confirmation

Please hand this instruction manual
to your STIHL specialist dealer in
the case of maintenance operations.
He will confirm the service operations
performed in the pre-printed boxes.

1

34

Service performed on

Next service date

0478 131 8327 B - EN

EN

0478 131 8327 B - EN

35

STIHL RMA 339, RMA 339 C

B

0478 131 8327 B