AS MOTOR AS 420 4T A User manual

Operating Instructions
Mulching Mower
AS 420 4T, AS 420 4T A,
AS 470 4T, AS 470 4T A, AS 470 Universal 4T
From serial number: 420 4T: 025613030001, 420 4T A: 025713030001,
470 4T: 025413030001, 470 4T A: 025513030001,
470 Universal 4T: 026513090001
Issued: 10 February 2015, V5.0
EN-Translation of the Original Operating Instructions

2
dummy
Preface
Please fill in all data referring to your device.
When ordering spare parts, provide your deal-
er with the device and engine number.
Serial number:
Pleases adhere the sticker from the warranty
card here.
Engine number:
Date of purchase:
Address of dealer:
Dear customer:
Congratulations on your purchase. You have
acquired a reliable quality product by “AS-
Motor Germany”.
This product has been manufactured according
to modern manufacturing methods and com-
prehensive quality assurance measures. Only
when you are satisfied with your device, we
have attained our goal.
Read these operating instructions carefully and
attentively so that your device operates
smoothly and you and others are safe from any
hazards. If you have questions concerning
your device, please contact your dealer or call
our customer service (tele-
phone [phone]). For international
AS partners, please see:
www.as-motor.de/worldwide.
“AS-Motor Germany” wishes you much joy with
your new device.
Intended use
The device is exclusively intended for mowing
well maintained grassed lawn areas.
Only use attachments and cutting tools author-
ised by “AS-Motor Germany”.
Any use exceeding this purpose is inadmissi-
ble. The manufacturer is not responsible for
any damage resulting from this. Observe the
required maintenance and repair measures.
The user of the device is responsible for acci-
dents or damage to other persons or their
property!
The device must not be used:
–To cut hard objects, rocks, rubble, or pieces
of wood.
–To trim bushes, hedges, and shrubbery.
–To cut plants in flower pots or planters or on
rooftops.
–To clean (vacuum) footpaths.
–As shredder for shredding tree and hedge
cuttings.
–As drive unit for work tools and any type of
tool sets that are not authorised by “AS-
Motor Germany”.

3
Contents
dummy
2
Preface.....................................................
2
Intended use............................................
2
dummy Inhalts verzeichnis
4
Explanation of the symbols ....................
4
Symbols in the instructions ....................
4
Symbols on the device...........................
4
Type overview..........................................
5
Safety instructions ..................................
6
Get informed!.........................................
6
User restrictions and hours of operation.
6
Safe handling of fuel..............................
6
Check the device prior to use.................
7
Use caution during operation .................
7
Prior to mowing......................................
7
Use caution when mowing.....................
7
When work is completed........................
8
Use caution during maintenance and
repair.....................................................
9
Device description...................................
10
Control elements.....................................
11
Assembly .................................................
12
Scope of delivery...................................
12
Unpacking..............................................
12
Mounting guide bar and handlebar.........
12
Mounting impact protection AS 470 Uni-
versal 4T................................................
12
Transport .................................................
12
Information on mowing...........................
13
Prior to starting........................................
13
Fuel .......................................................
13
Tanking up.............................................
14
Checking the engine oil level .................
14
Adjusting cutting height..........................
14
Starting.....................................................
14
Starting the device.................................
15
Driving (devices with drive) ....................
15
Driving...................................................
15
Turning..................................................
15
Driving (devices without drive)...............
15
Turning..................................................
15
Switching off and parking.......................
15
Maintenance and cleaning ......................
16
Preparations ..........................................
18
Cleaning the device ...............................
18
General inspection.................................
18
Maintaining the engine...........................
18
Checking the engine oil level..................
18
Checking the spark plugs.......................
19
Maintaining the air filter..........................
19
Checking the drive (devices with drive) ..
19
Checking the blade................................
20
Storage.....................................................
20
Storing the device..................................
20
Longer storage.......................................
21
Restarting..............................................
21
Spare parts...............................................
21
Wear parts................................................
21
Disposal ...................................................
21
Warranty...................................................
21
Troubleshooting ......................................
22
Accessories .............................................
24
Technical data AS 420.............................
25
Technical data AS 470.............................
27
Declaration of conformity AS 420,
AS 420 A...................................................
29
Declaration of conformity AS 470,
AS 470 A, AS 470 AS ...............................
30
Marketing
31

4
dummy Inhalts verzeichnis
Explanation of the symbols
Symbols in the instructions
In these operating instructions, the following
symbols are used to denote special dangers.
Warning.
These symbols denote special
dangers.
Prohibition sign.
These symbols denote inadmis-
sible procedures.
Directive sign.
These symbols denote required
protective measures.
Symbols on the device
The following symbols are placed on the de-
vice to inform you must be careful and atten-
tive when using the device:
Working with the device requires
extreme cautiousness.
Read the operating instructions
before you use the device.
Risk of injury!
Make sure that no one is within
the danger zone of the device.
Objects may be ejected.
The quickly rotating blade can
cause life threatening injuries or
immense property damage! Be
especially careful to keep your
hands and feet away from the
blade when the device is put into
operation.
Prior to any repair and mainte-
nance work, pull off the spark
plug connector.
Clean the ventilation grid!
The cooling air of the
motor is sucked in through
the ventilation grid of the
engine cover. Always keep
the entire surface open
and free!
Noise is causing health prob-
lems. Use personal ear protec-
tion to avoid hearing damage.
Only for AS 470 Universal 4T
Operate the device only
when impact protection or
mulching accessory is
fitted.

5
Type plate
The type plate on the device provides you
with information on the device type and
the technical data.
1
Name and address of the manufac-
turer
2
Device designation
3
Type designation
4
Rated power output in kW / engine
speed
5
Weight
6
Year of manufacture
7
Serial number
8
CE marking
9
Sound level LWA
leerer Absatz
Type overview
In this operating manual, the following device
types are described.
Depending on their equipment, the corre-
sponding descriptions of this operating manual
apply.
Drive
Impact protection
AS 420 4T
-
-
AS 420 4T A
X
-
AS 470 4T
-
-
AS 470 4T A
X
-
AS 470
Universal 4T
X
X

6
Safety instructions
Get informed!
For your safety, read these operating instruc-
tions with care. Familiarize yourself with the
control elements and the proper use of the
device. Share these operating instructions with
other users of the device.
Before you use the device for the first time, let
the dealer instruct you regarding safe use.
Get familiar with the device in a wide, open
and flat terrain first.
User restrictions and hours of
operation
Never allow children or persons who are not
familiar with the operating instructions to use
the device. Persons under 18 years of age
may operate the device only under proper
supervision. Local regulations determine the
minimum age of the operator und the operating
times.
Unsuitable for operation of the device are
persons who
–are under the influence of alcohol, drugs or
reaction retarding medicines.
–have physical and mental/emotional impair-
ments.
–are tired or sick.
People fitted with pace makers
are not allowed to touch any
current carrying parts of the
ignition system.
Safe handling of fuel
Danger!
Fuel is toxic and highly inflamma-
ble.
Danger of fire and explosion!
Keep the fuel away from ignition
sources and do not smoke while
handling the device.
Do not inhale fuel vapours; they are
dangerous to your health.
Use gloves and avoid skin
contact with the fuel.
Fuel up outdoors only when the engine is cool
and not running. Use a filler or funnel.
Do not spill any fuel and do not let the fuel get
into the canalisation or ground water.
If you spilled fuel, do not start the device until
the fuel vapours have evaporated (wipe dry).
Move the device away from the area where the
fuel was spilled.
Always close the tank cap securely and do not
open it while the engine is running or the de-
vice is still hot.
Drain the fuel tank only when outdoors. Use a
suitable container or run the tank empty.
Keep the fuel away from children and store it in
a suitable container in a dark, cool, and dry
location.
Never park the device with fuel in the tank
inside a building where fuel vapours could
come in contact with open fire or sparks.
Immediately replace a damaged fuel tank or
tank cap (authorised dealership).
First aid
When swallowing fuel or inhaling fuel vapours,
do not force vomiting and immediately consult
a doctor.

7
In case of skin contact, immediately wash with
water and soap. Change your soiled clothing
as soon as you can.
Measures in case of a fire
In case of a fire, use foam, dry powder extin-
guisher, or carbon dioxide (CO2). Never douse
with water!
Check the device prior to use
Prior to use, check the knife, drive and fas-
tening parts for proper working condition and
firm seating by visual inspection.
Never use the device with defective or missing
covers.
Do not remove, change or override any safety
devices or control elements.
Observe the maintenance instructions and
replace damaged or worn parts immediately.
Have an authorised service centre check your
device if the blade does not stop within
3 seconds.
Use caution during operation
Do not start the engine
–if fuel was spilled.
–in closed or poorly ventilated rooms (danger
of poisoning!).
–if there are other persons nearby.
Only start the device when your feet are at a
safe distance to the blade.
During startup of the engine, do not tilt the
device.
Do not touch the engine or the silencer. They
become very hot during operation and you can
get burned. Resulting unintentional movements
constitute an additional injury hazard.
Switch off the engine and wait until the blade
comes to a standstill
–before you tilt or transport the device.
–if you step away from the device, even for
just a short time.
–when you drive on surfaces other than
grass.
–before you adjust the cutting height.
–before you refuel.
Switch off the engine and wait until the blade
comes to a standstill, and pull off the spark
plug connector
–before you clean or check the device or
before you carry out work on the device.
–before you unblock or unclog the discharge
area.
Prior to mowing
Personal protective measures
While mowing, always wear
sturdy footwear with good grip,
long trousers, and gloves. Do
not mow in open sandals or
bare feet.
Noise is causing health prob-
lems. Use personal ear protec-
tion to avoid hearing damage.
Wear safety glasses and head-
gear.
Ask your specialised dealer about suitable
protective equipment.
Preparing the mowing area
Prior to mowing, carefully check the perimeter
of the lawn. Remove rocks, pieces of wood,
bones, wires, and other objects that could be
picked up and thrown out by the device.
Use caution when mowing
Risk of injury
Stay within shouting distance to other people
who can help you in case of an emergency.
Danger!
Risk of injury caused by thrown out
objects.
Never mow while persons, children,
pets, or property are in the vicinity.

8
The area in front of and to the right of the
device is especially dangerous.
Keep your hands and feet away from the
rotating parts.
Only mow during daylight or with adequate
artificial lighting. Never mow in the event of
uncertain weather conditions and risk of light-
ning.
Be especially carefully when mowing on soft
ground, nearby landfills, ditches and dikes.
Avoid mowing wet grass -
slipping hazard!
Be extremely cautious when turning the device
round or pulling it toward you and when mov-
ing in reverse.
Always walk slowly!
Never lift or carry the device when the engine
is running.
When using the device over a longer period of
time, vibrations can cause disturbances in the
blood supply of the hands. A generally accept-
ed usage time cannot be determined. Use
gloves.
Take breaks on time.
Have an authorised service centre check the
device immediately
–if the blade hit an object.
–if the device starts to vibrate unusually
severely.
Caution when mowing slopes
Devices fitted with a four stroke engines may
only be operated on less than 20° slopes.
Otherwise, the four stroke engine can by dam-
aged due to insufficient oil lubrication.
When mowing slopes,
there is a risk of slipping
and tilting!
–Only mow steep slopes when safe operation
assured.
–Do not mow excessively steep slopes.
–When mowing steep slopes, meet the ap-
propriate safety measures, e.g. use step
irons.
–Always mow in horizontal directions, never
up- or downwards.
–Sure footing is essential for your safety,
always wear skid proof safety shoes.
–Be extremely careful when changing the
direction.
–Only mow when the surface is dry and non-
slip.
The device can roll away when you mow
downhill. Put the device down on even surfac-
es only and prevent inadvertent rolling.
Mowing surfaces with fire hazard
–Carry a sufficient amount of suitable extin-
guishing agent.
–If side inclination is too great, fuel may leak
from the carburetor or the tank. This poses a
fire hazard!
–Observe the mowed surface also after mov-
ing is completed to ensure that no fire will
start.
To avoid risk of fire, keep the following compo-
nents free of dirt, grass, hay, leaking oil,
grease, etc.:
–Engine
–Silencer (manifold, guard, clearances)
–Area around the fuel tank
When work is completed
After mowing, always close the fuel valve (if
existing).
Prior to leaving the device, wait until the blade
comes to a standstill and pull off the spark plug
connector.
After switching it off, let the device cool down
for at least 20 minutes before you store it in a
dry, closed, sufficiently ventilated room.
Never store the device when there is fuel in the
tank inside a building where fuel vapours might
come into contact with open fire or sparks.

9
Use caution during maintenance
and repair
Only carry out maintenance work as described
in these operating instructions. Have an au-
thorised service centre carry out all other work.
Only use the knives and spare parts authorized
by “AS-Motor Germany”. Unauthorized knives
and spare parts can cause severe injuries.
Prior to all maintenance work, wait until the
engine comes to a standstill and pull off the
spark plug connector.
We explicitly point out that, in accordance with
the Product Liability Act, we are not liable for
damages that were caused by our devices if
–worn or damaged parts were not repaired or
replaced on time.
–these damages were caused by improper
repair.
–when changing a part, our original parts or
parts authorised by use were not used.
–the repair work was not carried out by an
authorised service station.
The same applies for spare parts and accesso-
ries.
leerer Absatz 11 Z eilen

10
Device description
1
12
2
11
10
3
8
67
4
9
5
13
14
1
Fuel valve (if existing)
2
Cutting height adjustment
(40 mm, 50 mm, 60 mm, 70 mm,
80 mm)
3
Air filter
4
Spark plug connector
5
Type plate
6
Guide bar with control elements
7
Bar release
8
Starter grip
9
Silencer
10
Ventilation grid
11
Tank filler spout
12
Oil filler opening
13
Impact protection (only for
AS 470 Universal 4T)
14
Cover

11
Control elements
3
1
2
Engine brake lever (1)
The engine brake lever is a guard device.
When you release the lever, the engine is
shut off immediately, the knife comes to a
standstill within3 seconds.
Operating position:
Press the engine brake bar towards the
handlebar.
Switching off the engine:
Release the engine brake lever.
0
I
0
I
M
Top:
Engine brake bar
Bottom:
Drive bar
Drive bar (2 –only for devices with drive)
With the drive bar, you switch the drive on
and off.
Drive on:
Pull the bar toward the handlebar
Drive off:
Release the bar
Height adjustment of handlebar
1. Release both knobs (3) at the handlebar.
2. Swivel the handlebar to the desired posi-
tion and tighten both knobs again.
Mounting handlebar one position lower
1
2
B
A
1. Unscrew the knob (2) from the left and right
guide bar.
2. Unscrew the screw (1) from the left and
right guide bar.
3. Screw the screws (1) back down on posi-
tion lower (A).
4. Screw the knobs (2) back in (do not tight-
en) one position lower (B).
5. Swivel the handlebar to the desired posi-
tion and screw the knobs back down.
Fuel valve
2
1
1: Closed
2: Open

12
Assembly
Scope of delivery
The device is delivered in a carton.
The scope of delivery includes:
–The device.
–These operating instructions.
–Tool bag with small items.
–Warranty card.
–Operating instructions of the engine manu-
facturer.
Unpacking
1. Remove the loose parts from the box.
2. Cut open the front side of the box.
3. Push the device out of the box
Mounting guide bar and handlebar
1
2
3
4
5
1. Fold the guide bar (1) until it engages.
2. Unscrew both knobs (2) all the way.
3. Swivel the handlebar (3) into the desired
position.
4. Screw both knobs back in and tighten
them.
5. Tighten the two cable ties (4) at the bar.
Folding the guide bar
1. Pull the bar release device (5) upwards.
2. Fold the guide bar forward.
Mounting impact protection
AS 470 Universal 4T
212 2 2
1. Insert the attached 4 screws with square
neck from the inside of the device housing
into the holes (2).
2. Thread the impact protection (1) through
and screw it down with 4 nuts.
leerer Absatz
Transport
Switch off the engine and wait until the blade
stands still before you lift the device. Two
people shall lift the device.
Prior to transport, let the device cool down for
at least 20 minutes. Close the fuel valve (if
existing).
For transport, you can fold up the guide bar.
When transporting by vehicle, secure the
device against rolling, sliding, tilting, and fuel
and oil leakage.

13
Use tension belts to secure the device.
Beware: To avoid damage to the device,
fasten the tension belts exclusively as shown
in the illustration. Do not overtighten the ten-
sion belts.
leerer Absatz
Information on mowing
Prior to mowing, check your device for com-
pleteness, proper functioning, and cleanliness.
A dirty ventilation grid causes overheating of
the engine, this can damage the engine. A dirty
protective grid at the silencer poses a fire
hazard.
For your grass to grow beautiful and thick,
mow frequently and keep the grass short. Do
not mow your lawn too low in dry and hot
conditions because the lawn is susceptible to
sun and heat damage and will look unsightly!
Only mow with a sharp and undamaged blade
so that the blades of grass do not fray. Have
the blade sharpened and balanced regularly
(authorised service centre).
Do not mow when the grass is wet or when it is
raining. The turf may be damaged and there is
a danger of slipping!
Turn the device around only in already mown
sections. Do not leave the device unattended
while the engine is running.
To evenly distribute grass remains and to
achieve an even cutting height, we recom-
mend, for flat terrain, to proceed according to
the illustrated mowing pattern.
The mulch layer that results form mowing
should not be thicker than 1-2 cm. Otherwise,
during the decomposing process, a thick layer
forms that negatively effects the important air-
gas-exchange of the soil. In addition, the mow-
er can clog.
If you mow once a week or every other week,
we recommend a cutting height of 7-8 cm. If
you desire a lawn that is lower, you need to
mow more often. As a rule, you should not be
cutting off more than 1/3 of the length of blade
of grass.
If the grass is extremely high, mow twice at
different cutting height settings.
leerer Absatz
Prior to starting
Fuel
As fuel, use unleaded petrol (see operating
instructions of the engine manufacturer).
You can use E10 petrol. Do not store E10
petrol longer than 30 days.

14
Tanking up
Danger!
Fuel is ignited by hot engine parts.
Prior to filling up, switch off the
engine and wait for at least
20 minutes until the engine has
cooled down. Observe the safety
instructions regarding the fuel!
Filling in the fuel:
1. For filling, use a canister with a filler spout
or use as funnel.
2. Open the canister carefully so that the
existing overpressure is discharged slowly
and no fuel spurts out.
3. Open the tank cap carefully so that the
existing overpressure is discharged slowly
and no fuel spurts out.
4. Fill the fuel tank.
5. Screw the tank cap on tightly.
Checking the engine oil level
Attention! Prior to each use, check the engine
oil level (see operating instructions of the
engine manufacturer).
To ensure sufficient oil supply for the four
stroke engine and to avoid resulting engine
damage, the device may only be used on
slopes up to 20°.
Adjusting cutting height
Adjust the cutting height setting only when the
engine is switched off.
Set the cutting height so that the blade does
not touch the ground even in case of terrain
unevenness. If the cutting height is set too
high, objects can be ejected and the “clean cut
appearance” can be destroyed.
1
The cutting height can be adjusted in 5 posi-
tions from 4 cm to 8 cm.
1. Switch off the engine and wait until the
blade has come to a standstill.
2. Push the central adjustment lever (1)
backwards and push the device at the
guide bar to the desired height.
leerer Absatz
Starting
Danger!
During startup, there is a risk of
injury caused by the rotating blade.
Make sure that no one is within the
danger zone of the blade. Do not tip
the device over to one side during
startup.
Danger!
If after startup the carburetor does
not close properly, fuel will overflow
and a fire hazard occurs.
Close the fuel valve (if existing) and
contact an authorised service cen-
tre.

15
Starting the device
1. Put the device on even terrain, not in high
grass.
2. Open the fuel valve (if existing).
3. Put on the spark plug connector.
4. Actuate and hold the engine brake lever.
5. Pull the starter point slowly out until you
feel resistance then pull out quickly –en-
gine starts to run.
6. Let the starter rope retract slowly.
leerer Absatz
Driving (devices with drive)
Danger!
Risk of injury caused by tripping or
sliding while moving the mower
backwards and turning it round.
Make sure that the area is clear of
objects and watch for safe footing.
Driving
In case of a dangerous situation, switch off the
blade by releasing the engine brake bar.
Drive on
1. Press the drive lever towards the handlebar
–device is running.
Beware: If the drive is not completely en-
gaged, the gearbox can overheat and be
damaged. Always pull the drive lever all the
way to the handelbar.
Check the settings of the drive regularly (see
Maintenance).
Drive off
1. Release the drive bar.
Turning
Turn the device round only where the grass
has been mowed already.
Turning round on an even surface:
1. Switch off the drive.
2. Turn the device to the desired side.
3. Switch the drive back on.
Turning round on a sloping area:
1. Keep the drive switched on.
2. Turn the device upslope.
3. Hold back the handlebar and the inner
wheel.
The drive prevents sliding and supports the
turn manoeuvre.
leerer Absatz
Driving (devices without
drive)
Danger!
Risk of injury caused by tripping or
sliding while pushing the mower,
moving it backwards and turning it
round.
Make sure that the area is clear of
objects and watch for safe footing.
Turning
Turn the device round only where the grass
has been mowed already.
leerer Absatz
Switching off and parking
Caution!
On a slope, the device can roll
away.
Put the device on even ground only
or secure it against rolling away.
1. Release the drive lever (devices with
drive).
2. Release the engine brake bar.
3. Wait until the engine comes to a standstill
before you step away from the device.
4. Close the fuel valve (if existing).
5. Pull off the plug connector.
leerer Absatz

16
Maintenance and cleaning
Regular maintenance keeps your device ready
for use.
If you do not observe the maintenance notices,
faults may occur that are not covered by the
warranty. Operational safety is endangered as
well.
Contact your authorised service centre for
checkup if you detect problems during mainte-
nance.
Component
Action
Maintenance
interval
A
B
Device
Check for safe working condition (basic inspection).
■
▲
Clean.
■
Customer service.
▲
Fuel
Check fuel level.
■
Is the tank cap closed?
■
Tank,fuel valve,
and fuel line
Check parts for leaks and check for good condition.
■
▲
Carburetor
Does the carburetor close again after starting?
■
▲
Ventilation grid
Clean.
■
▲
Engine cooling
Clean.
▲
Spark plug
Check/replace.
▲
Air filter
Maintain.
■
■▲
Blade and fas-
tening components
Check for wear and damage. See chapter Checking the
blade.
■
▲
Change.
▲
Motor brake
Does the knife stop within 3 seconds?
□
▲
Drive bar
Does the device stop when the bar is in zero position?
□
▲
V-belt
Are the belts tensioned correctly, without fissures, and in
good condition?
▲
Bowden cables
Check for proper function and ease of movement.
■
▲
Chassis and im-
Check for rust and fissures and check the welding seams.
■
▲

17
pact protection
Are all protective devices and covers in place, fastened
correctly and properly functioning?
■
▲
Label
Condition of the labels.
■
▲
Engine
See operating instructions of the engine manufacturer.
■
▲
Check oil level (see operating instructions of the engine
manufacturer).
■
▲
Oil change.
▲
Flammable materi-
al
Remove easily flammable debris buildup from the engine
and the device.
■
▲
Tyres
Check tyres and, if necessary, the tyre pressure.
■
▲
A
B
■
□
▲
Before and after each use.
Annually or every 50 h.
By the user when the engine is not running.
By the user when the engine is running.
By the authorised service centre.

18
Preparations
Prior to all maintenance and cleaning work:
1. Let the device cool down for at least 20
minutes.
2. Pull off the spark plug connector.
3. Close the fuel valve (if existing).
4. To work on the undeside of the device, tilt
the device towards the silencer side.
Cleaning the device
Depending on use, clean the device thorough-
ly, especially the bottom and the knife.
Grass cuttings and dirt that are stuck interfere
with the grass ejection and impair the cutting
quality. To sufficiently cool the engine, keep
the engine cover, ventilation grid and engine
clean.
Fire hazard! Take particular care that the
components at the silencer are clean.
For cleaning, use a hand brush. Remove
stubborn dirt with a wooden or plastic spatula.
Clean the outside housing parts with a cloth.
Do not clean the device with water spray or
high-pressure cleaner! Do not use any aggres-
sive cleaning agents.
General inspection
To ensure proper working order of the device,
regularly check all nuts, bolts, screws, fuel line
connections, air filters, etc. for firm seating.
Check the ignition cable and the spark plug
connectors for damages.
Immediately replace damaged or worn parts,
especially covers, silencers or fuel tank (au-
thorized service centre).
Check all parts that contain fluids for leaks and
proper condition. These can be: Fuel tank, fuel
valve, fuel lines, carburetor, engine, gears,
battery, hydraulic system.
In case of leaks, contact an authorised service
centre.
Maintaining the engine
Danger!
If the speed of rotation is set too
high, objects can be ejected. The
engine can be damaged and noise
pollution increases.
Do not change the basic setting of
the carburetor or the speed control.
The operating instructions of the engine are
prepared by the engine manufacturer. They
contain the maintenance instructions and the
warranty conditions for the engine. If warranty
work for the engine is required, please contact
your authorised service centre or the nearest
authorised engine dealer.
To ensure a long service life of the engine,
sufficient engine cooling is required.
Keep the
- engine cover (ventilation grid),
- silencer (protective grid) and
- cooling fins of the engine
clean at all times.
Checking the engine oil level
Never allow the oil level to be too low other-
wise the engine can be damaged. Never fill in
too much oil. Otherwise, there is the risk that
the oil enters and destroys the air filter.
For this, observe the attached operating in-
structions of the engine.

19
Checking the spark plugs
Danger!
The ignition system generates an
electromagnetic field.
Wearers of pacemakers must not
work on live parts.
Soiled spark plugs reduce the engine output.
Clean the electrode of the spark plug with a
brass wire brush. Check the electrode gap
(see operating instructions of the engine manu-
facturer). Make sure that the insulator around
the electrode is not damaged. Never use a
damaged spark plug.
Tighten the spark plug using the correct torque
(see operating instructions of the engine manu-
facturer).
Maintaining the air filter
Danger!
Cleaning agents pose a fire and
explosion hazard.
Never clean the air filter with flam-
mable solvents.
Make sure that the air filter is always clean. A
dirty air filter reduces the engine performance
and leads to increased engine wear and fuel
consumption. Irrespective of the operating
hours, change the filter insert at least once a
year. Do not operate the engine without air
filter.
For this, observe the attached operating in-
structions of the engine.
Checking the drive (devices with
drive)
1. Put the device on a non-slip surface (e.g.
concrete or asphalt).
2. Switch off the engine.
3. Actuate the drive.
4. Try to pull the device backwards.
If the rear wheels lock, the drive is correctly
adjusted. If you can pull the device, the drive
must be re-adjusted.
1
3
2
4
Readjusting the drive
You can readjust the drive at 2 points.
1. Turn the nut (1) towards the drive lever.
2. Lock the counternut (2) against the nut (1).
Or:
1. Turn the sleeve (3) at the drive away from
the nut (4).
2. Lock the nut (4) against the sleeve.
Adjust the drive so that
–while the drive is actuated, the wheels will
lock up when the device is pulled,
–while the drive is not actuated, the wheels
turn feely.
If there is not any noticeable improvement after
the adjustment, have an authorised service
centre check the device.
Beware: If the drive is not adjusted correctly,
the gearbox can overheat or be damaged.

20
Checking the blade
Danger!
Improperly mounted and main-
tained blades pose a severe injury
hazard.
Work at the blade shall only be
performed by an authorised service
centre.
Wear sturdy gloves when you
check the blades.
Work on the blade requires special qualifica-
tions because an unbalance test is required
and the torques must be observed.
Check the blade and all fastening parts for
wear, damage and cracks
–before and after each mowing operation.
–when there are significant changes.
All blade parts shown and their fastening parts
must be changed
–when damage or cracks were found.
–At least once a year or every 50 operating
hours, regardless of whether there is wear or
not. Material wears out, gets cracks which
can endanger persons or property.
Vibrations indicate that
–the blade is worn excessively on one side or
–damage of motor or cutting unit mount (e.g.
rubber elements).
Improperly sharpened blades increase the
device load and result in fatigue cracks and
breakage.
Ejected pieces can cause severe injuries.
Blade change
1
1
2
2
It is absolutely necessary to change the blade:
–When one of the wear markings (1) was
reached. Original blade are engraved with
wear markings (marking in form of a ball-
shaped imprint on the rear side of the
blade).
–When the thickness of the blade at the rear
edge of the vane (2) or at another point is
below 1 mm (exception: cutting edge).
Original blade
An original AS-blade is engraved with:
AS GXXXXXXXX or EXXXXX
This corresponds to the spare part number.
Checking engine brake
Check the function of the engine brake by
switching off the engine. The blade must come
to a standstill from full speed within less than
3 seconds. Contact an authorised service
centre if this is not the case.
leerer Absatz
Storage
Storing the device
Keep the device in a closed, dry, and well
ventilated room and out of reach of children.
Always eliminate all problems of the device
before you store it so that the device is always
in a safe-to-operate state. Let the engine cool
down before you store the device in closed
rooms.