AS MOTOR AS 420 4T User manual

Operator's Manual
Mulching Mower
AS 420 4T, AS 470 4T,
AS 470 4T A, AS 470 Universal 4T
From serial number: 420 4T: 029616100001, 470 4T: 029316100001,
470 4T A: 02941610001, 470 Universal 4T: 029516100001
Issued: 27 September 2016, V6.0
en-Translation of the Original Operator's Manual

2
dummy
Notes on the operating
manual
Dear customer,
Congratulations on your purchase. You have
acquired a reliable quality product by “AS-Mo-
tor 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.
These operating instructions contain important
information to help you avoid hazards and to
increase the reliability and the life span of the
device.
Read the operating instructions
before using the device. Share
these operating instructions and
the operating instructions of the
engine with other users of the
device.
Contact
If you have questions concerning your device,
please contact you dealer or call our customer
service ([phone]).
For international AS partners, please see:
www.as‑motor.de.
Device data
Please fill in all data referring to your device.
When ordering spare parts, provide your
dealer with the serial and engine numbers.
Serial number (see manufacturer’s certificate
or type plate):
Engine number:
Date of purchase:
Address of dealer:
Intended use
The device is exclusively intended for mowing
well maintained grassed lawn areas.
Only use attachments and cutting tools autho-
rised by “AS-Motor Germany”.
Any other use exceeding this purpose is inad-
missible.
Observe the instructions chapter Maintenance
and cleaning. Otherwise, operational safety is
endangered.
The user of the device is responsible for acci-
dents or damage that can happen to other per-
sons 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
Notes on the operating manual............. 2
Contact .................................................... 2
Device data.............................................. 2
Intended use............................................ 2
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
Danger area............................................. 7
Use caution during operation................... 8
Prior to mowing........................................ 8
Use caution when mowing....................... 8
Caution when mowing slopes.................. 9
When work is completed......................... 10
Use caution during maintenance and re-
pair........................................................... 10
Device description.................................. 11
Control elements .................................... 12
Information on mowing.......................... 13
Prior to starting....................................... 13
Fuel.......................................................... 13
Tanking up............................................... 13
Checking the engine oil level................... 13
Adjusting cutting height........................... 14
Starting.................................................... 14
Starting the device................................... 14
Driving (devices with drive)................... 15
Driving..................................................... 15
Turning.................................................... 15
Driving (devices without drive) ............. 15
Turning.................................................... 15
Switching off and parking...................... 15
Transport ................................................ 16
Maintenance and cleaning..................... 17
Preparations............................................ 19
Cleaning the device................................. 19
General inspection................................... 19
Maintaining the engine............................ 19
Checking the engine oil level................... 20
Checking the spark plugs........................ 20
Maintaining the air filter........................... 20
Checking the drive (devices with drive)... 20
Checking the blade.................................. 21
Checking engine brake............................ 21
Assembly................................................. 22
Scope of delivery..................................... 22
Unpacking................................................ 22
Mounting guide bar and handlebar.......... 22
Mounting impact protection AS470Uni-
versal4T.................................................. 22
Storage .................................................... 23
Storing the device.................................... 23
Longer storage........................................ 23
Restarting................................................ 23
Spare parts.............................................. 23
Wear parts............................................... 23
Disposal................................................... 23
Warranty.................................................. 24
Troubleshooting ..................................... 25
Accessories............................................. 28
Technical data AS 420............................ 29
Technical data AS470............................ 30
Declaration of conformity AS420,
AS420A.................................................. 32
Declaration of conformity AS470,
AS470A, AS470AS.............................. 33

4
dummy Inhaltsverzeichnis
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 inad-
missible procedures.
Directive sign.
These symbols denote required
protective measures.
Symbols on the device
The following symbols are placed on the
device to inform you must be careful and at-
tentive 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 mainten-
ance work, pull off the spark
plug connector.
Clean the ventilation grid!
The cooling air of the mo-
tor 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.
Do not clean the device with wa-
ter spray or high-pressure
cleaner!
Only for AS 470 Universal4T
Operate the device only
when impact protection or
mulching accessory is fit-
ted.

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
manufacturer
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
Type overview
In this operating manual, the following device
types are described.
Depending on their equipment, the corres-
ponding descriptions of this operating manual
apply.
Traction
drive
Impact
protection
AS 420 4T - -
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 carefully. Familiarize yourself with the
control elements and the proper use of the
device. Share these operating instructions with
other users of the device.
Have skilled personnel who were trained by
AS-Motor show you the safe handling of the
device before you work with it for the first time.
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 su-
pervision. Local regulations determine the min-
imum age of the operator und the operating
times.
Unsuitable for operation of the device are per-
sons 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 cur-
rent carrying parts of the ignition
system.
Safe handling of fuel
Danger!
Fuel is toxic and highly inflammable.
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 con-
tact 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
device 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 in-
side 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.
In case of skin contact, immediately wash with
water and soap. Change your soiled clothing
as soon as you can.

7
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 fasten-
ing 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 re-
place damaged or worn parts immediately.
Have an authorised service centre check your
device if the blade does not stop within
3seconds.
Danger area
Fig.1:
Within the danger area of the device, there is a
risk of injury.
The rotating knife can cause injuries and ob-
jects can be thrown out. The area in front of
and to the right of the device is especially dan-
gerous.
On slopes, the device can topple over and
slide towards persons or run them over.
Make sure
– that nobody else is in the area that will be
mowed.
– that people are never positioned in the direc-
tion of travel in front of the device.
– that nobody is positioned on the slope below
the device.
– that you have a complete overview of the
danger area at all times.
– that you keep your hands and feet away
from the rotating parts.

8
Use caution during operation
Danger of injury during motor start
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.
When the engine is started, the device must
not be tilted.
Risk of injury when the motor is running
Switch off the engine and wait until the blade
stops
– before you tilt or transport the device.
– before 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 be-
fore you carry out work on the device.
– before you unblock or unclog the discharge
area.
Risk of burns
Do not touch the engine or the silencer. These
parts become very hot during operation and
you can get burned. If a jumpy movement oc-
curs, the risk of additional injuries can result.
Prior to mowing
Personal protective measures
During mowing, always wear
safety shoes with good grip and
long trousers. Do not mow with
open sandals or while shoeless.
Wear safety gloves to protect
yourself against injuries and vi-
brations.
Noise is causing health prob-
lems. Use personal ear protec-
tion to avoid hearing damage.
Wear safety glasses and
headgear.
Ask your specialised dealer about suitable pro-
tective 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.
Make sure that nobody is in the danger area.
Keep your hands and feet away from the rotat-
ing parts.
Only mow during daylight or with adequate arti-
ficial lighting. Never mow in the event of uncer-
tain weather conditions and risk of lightning.
Be especially carefully when mowing on soft
ground, nearby landfills, ditches and dikes.

9
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.
Pay attention to traffic when working close to
roads.
Vibrations
When the device is used over a longer period
of time, vibrations can cause disturbances in
the blood supply of the hands. A generally ac-
cepted usage time cannot be determined.
– Use gloves.
– Take breaks on time.
Have an authorised service centre check the
device
– when the blade has hit an object.
– if the device starts to vibrate unusually
severely.
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 com-
ponents free of dirt, grass, hay, leaking oil,
grease, etc.:
– Engine
– Silencer (manifold, guard, clearances)
– Area around the fuel tank
Caution when mowing slopes
Devices fitted with a four stroke engines may
only be operated on less than 20° slopes. Oth-
erwise, the four stroke engine can by damaged
due to insufficient oil lubrication.
When facing downhill, the device can roll
away. Park the device on level ground only
and secure it against rolling away.
Sliding and tipping risk
Danger!
Risk of injury during mowing down-
hill due to tipping over or sliding.
Please observe the following inform-
ation.
– Mow on steep terrain only when safe opera-
tion can be guaranteed.
– Do not mow on extremely steep slopes.
– Take suitable precautions on steep slopes,
e.g. by using step irons.
– Always mow crossways to the slope, never
upwards or downwards.
– Always make sure that you step safely, use
non-slip safety shoes.
– Be extremely cautious when changing the
direction.
– Mow only when the ground is dry and has a
good grip.
If the device tilts or slips
– If you attempt to stop a device that is tilting
or slipping, severe injuries can result. If tilt-
ing or sliding cannot be stopped in the be-
ginning without endangering anyone, do not
continue to try to stop the device.
– Remove leaking fluids (oil, fuel, battery acid)
from the device and the floor. Deposit of
contaminated soil environment friendly ac-
cording to the local regulation.

10
– Undetectable damage may have occurred to
the device. In case of malfunctions, there is
a risk of injury. Have an authorised service
centre check the device.
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.
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 en-
gine 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 au-
thorised service station.
The same applies for spare parts and ac-
cessories.

11
Device description
1
12
2
11
10
3
8
6
7
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Univer-
sal4T)
14 Cover

12
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
Fig.3:
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
tighten) 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

13
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 haz-
ard.
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 con-
ditions 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
mower 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 dif-
ferent cutting height settings.
Prior to starting
Fuel
As fuel, use unleaded petrol (see operating in-
structions of the engine manufacturer).
You can use E10 petrol. Do not store E10 pet-
rol longer than 30 days.
Tanking up
Danger!
Fuel is ignited by hot engine parts.
Prior to filling up, switch off the en-
gine and wait for at least 20minutes
until the engine has cooled down.
Observe the safety instructions re-
garding the fuel!
Filling up with fuel
1. For filling, use a canister with filler spout or
a funnel.
2. Open the canister carefully so that existing
excess pressure is slowly reduced.
3. Open the tank cap carefully so that existing
excess pressure is slowly reduced and no
fuel sprays out.
4. Fill the fuel tank.
5. Tightly close the tank cap again.
Checking the engine oil level
Attention! Prior to each use, check the engine
oil level (see operating instructions of the en-
gine 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°.

14
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
Fig.4:
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) back-
wards and push the device at the guide bar
to the desired height.
Starting
Danger!
During startup, there is a risk of in-
jury 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
centre.
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.

15
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.
Notice!
If you do not engage the traction
drive completely, the transmission
will be overheated and damaged.
Do not try to control the driving
speed with the drive bar.
Always pull the drive bar all the way
towards the handlebar.
Check regularly the settings of the
traction drive, at the latest when the
driving force diminishes (see Main-
tenance).
Drive on
1. Press the drive bar towards the handlebar
– device starts moving.
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.
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.
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.

16
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 ex-
isting).
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.
Fig.5:
Fig.6:
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.

17
Maintenance and cleaning
Improper maintenance can make the device unsafe for operation and result in accidents. Regular
maintenance keeps you device ready for use.
Service the device according to the following maintenance instructions.
Contact an authorised service centre if problems during maintenance occur or if you determine de-
ficiencies during one of the following inspections.
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 fasten-
ing 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? □ ▲
Drive Check. ■ ▲
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 impact
protection
Check for rust and fissures and check the welding seams. ■ ▲
Are all protective devices and covers in place, fastened
correctly and properly functioning?
■ ▲
Label Condition of the labels. ■ ▲

18
Engine For reliable information, see the operating manual of the
engine manufacturer.
■ ▲
Check oil level (see operating instructions
of the engine manufacturer).
■ ▲
Oil change. ▲
Flammable material 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.

19
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
Fig.7:
Depending on use, clean the device thor-
oughly, especially the bottom and the blade.
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 com-
ponents at the silencer are clean.
For cleaning, use a hand brush. Remove stub-
born 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 ag-
gressive 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
(authorized service centre).
Check all parts that 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 engine manufacturer has prepared the op-
erating manual of the engine. The manual con-
tains all maintenance requirements and war-
ranty conditions for the engine. If warranty
work at the engine is required, contact your au-
thorised service centre or the next authorised
dealer for engines.
To ensure a long service life of the engine, suf-
ficient engine cooling is required.
Keep the
- engine cover (ventilation grid),
- silencer (protective grid) and
- cooling fins of the engine
clean at all times.

20
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.
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 power and
leads to increased engine wear and fuel con-
sumption. Independent 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 ad-
justed. 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.