Limpar WKB 750 User manual

Operating Manual
Limpar WKB 750
Language of the original operating manual: German. Keep on hand for further use!
4F Maschinentechnik GmbH
Am Gasspeicher 6, 49453 Rehden, Germany
Tel.: [phone], Fax: [phone]
Email: [email protected], Internet: www.4-f.de
© 4F Maschinentechnik GmbH

Page 2 of 35 01.07.2019 Limpar WKB 750
Introduction
Dear reader,
This operating manual provides all information for safe
operation of the weed burner.
The Limpar Weed Burner WKB 750 has been designed and
built in accordance with the state of the art and recognised
safety rules and regulations. Nevertheless dangers for
personnel or objects can occur, because not all danger zones
can be avoided if the functionality is to remain intact. However
you can prevent accidents due to these dangers by complying
with the instructions in this operating manual. Moreover you
will then be able to use the machine to its full capacity and
avoid unnecessary disturbances.
CAUTION!
There is danger of injury and danger of material damage when
assembling, operating, and maintaining the weed burner.
Therefore:
 First read this operating manual carefully, prior to assembly
and operation of the weed burner. Always comply with the
instructions and information contained herein, particularly
the safety instructions.
 If the operating manual is lost or in poor condition, request
a new copy from the manufacturer (the same applies fo
r
parts of the operating manual).
This operating manual only applies for the weed burner
specified on the cover sheet and at the end of every page.
Compare this information with the information on the type
plate of the weed burner.
After you have read the entire operating manual thoroughly for
the first time, take good care of the operating manual over the
entire service life of the weed burner, so that you can look up
something later.
If you sell the weed burner, give this operating manual to the
new owner.
All information, illustrations and dimensions in this operating
manual are non-binding. No claims whatsoever can be derived
from this information, illustrations or dimensions.
Introduction

Limpar WKB 750 01.07.2019 Page 3 of 35
Reprinting or duplication of any type, including excerpts,
requires the written permission of the manufacturer.
Conversion of, or changes to the weed burner are only
permitted with the manufacturer's written consent.
Unauthorised conversion voids any liability on the part of the
manufacturer, as well as the guarantee.
Only use original spare parts and accessories that are
approved by the manufacturer. Otherwise the design-specified
characteristics of the weed burner, the functionality or the
safety can be impaired. Consequently the use of other parts
voids the liability for the ensuing consequences.
Contact your specialist dealer to order spare parts or
accessories.
In addition, comply the instructions of the gas supplier
regarding the use, storage, transport and filling of gas
cylinders.
4F Maschinentechnik GmbH accepts no liability for the content
of the instructions of the gas supplier.
Explanation of symbols, signs and direction indications
For better understanding, the following conventions are used
for this operating manual:
1.
To emphasise important information, the following types of
special notices are used:
DANGER!
 There is an imminent dangerous situation that results in death
or serious injury if it is not avoided.
WARNING!
 There is a possible dangerous situation that can result in
death or serious injury if it is not avoided.
Introduction

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CAUTION!

There is a possible dangerous situation that can result in
minor injury or material damage, if it is not avoided.
ATTENTION!
...indicates a possible dangerous situation that can result in
material damage, if it is not avoided.
NOTE
...indicates useful tips and recommendations, as well as
information for efficient and trouble-free operation.
...refers to important information in other sections and
documents.
2.
Many texts serve a particular purpose. These texts are
marked as follows:
 Listings.
 Instructing text, e.g. a sequence of activities.
3.
In the text, sides of the Limpar WKB 750 weed burner are
cited (left, right, front, back). Left or right refers to the side that
the operator of the machine sees viewed from the direction of
travel. The combustion chamber of the machine is mounted on
the front, the handlebar on the rear.
Introduction

Limpar WKB 750 01.07.2019 Page 5 of 35
Table of contents
Introduction ............................................................................. 2
Table of contents .................................................................... 5
1 Safety ................................................................................... 7
1.1 Intended use .............................................................. 7
1.2 Non-intended use ....................................................... 8
1.3 Product observation .................................................... 8
1.4 Requirement imposed on personnel ........................... 9
1.5 Danger zone ............................................................... 9
1.6 Work clothing ............................................................ 11
1.7 Safety devices and protective devices ..................... 11
1.7.1 Safety switch ................................................... 11
1.7.2 Hose break safeguard ................................... 11
1.8 Safety regulations and accident
prevention regulations ............................................... 12
1.9 Disposal ................................................................... 14
1.10 Safety sign on the weed burner ............................. 15
2 Description ....................................................................... 16
2.1 Type plate ................................................................ 16
2.2 Overview .................................................................. 17
2.3 Technical data ......................................................... 18
3 Commissioning ................................................................ 19
3.1 Unpacking ................................................................. 19
3.2 Mounting the handlebar ............................................ 19
3.3 Mounting the back panel ........................................... 21
4 Operation .......................................................................... 22
4.1 Preparatory activities ............................................... 24
4.1.1 Connecting the gas cylinder .......................... 24
4.1.2 Checking the gas connection ......................... 25
4.1.3 Checking the ignition ...................................... 25
Table of contents

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.
Table of contents
4.2 Starting the weed burner ........................................... 26
4.2.1 Igniting the weed burner .................................. 27
4.2.2 Stopping the weed burner ............................... 27
4.2.3 Pushing the weed burner ................................ 28
4.2.4 Parking the weed burner for a
longer period of time ........................................ 28
5 Maintenance and repair ................................................ 29
5.1 Safety guidelines for maintenance
and repair .................................................................. 29
5.2 Regular maintenance tasks ....................................... 30
5.2.1 Maintenance schedule .................................... 30
5.2.2 Maintenance records ....................................... 31
5.2.3 Checking the Bowden cables for
ease of movement .......................................... 31
5.2.4 Replacing the battery ...................................... 31
5.2.5 Checking the ignition electrode ....................... 32
5.2.6 Cleaning the weed burner ............................... 32
5.3 Maintenance and repair verifications ........................ 33
6 Decommissioning and preservation ............................. 34
7 Faults and fault correction ............................................. 34
8 Specialist dealers ........................................................... 34
9 Declaration of Conformity .............................................. 35

Limpar WKB 750 01.07.2019 Page 7 of 35
1 Safety
The basic prerequisite for safe and trouble-free operation of
the weed burner is knowledge of the safety instructions and
safety regulations.
Consequently read this section carefully all the way through
before operating the machine, and comply with the specified
instructions and warnings. The safety instructions and
warnings that you find at the appropriate point in the text of the
following sections must be complied with. The manufacturer
cannot be made liable if the instructions and warnings are not
complied with.
In addition to the instructions contained in this operating
manual, the statutory regulations, particularly the safety and
accident prevention regulations, must also be complied with.
1.1 Intended use
The weed burner may only be used to heat weed growth on
paved, concrete, gravel and/or asphalt surfaces outside
enclosed spaces.
The weed burner may only be operated with propane gas.
The instructions of your gas supplier must be complied with.
Compliance with all the information in the operating manual is
also part of the intended use.
DANGER!
If the weed burner is used for a use other than the use
described above, dangerous situations can occur for people or
material damage can occur.
Therefore:
 Only use the machine for its intended purpose.
 Always comply with all the instructions in this operating
manual.
 Particularly refrain from the uses of the weed burner listed in
section 1.2. They are considered non-intended use.
Safety

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1.2 Non-intended use
Any use that deviates from the use described in section 1.1 is
considered non-intended use
For example, non-intended use of the weed burner is, if
 it is used in enclosed spaces, e.g. greenhouses or barns,
 it is transported or parked with a burning flame,
 it is operated in a faulty condition or in the event of safety-
relevant faults,
 it is operated without the protective covers fitted as
standard equipment,
 it is used by unsuitable personnel.
 the flame is ignited with a match, lighter or burning piece
of paper.
 it is operated with non-approved gas e.g. LPG or butane,
 it is used in the preparation of foodstuffs,
 it is used to ignite bushes or other flammable objects,
1.3 Product observation
Notify us without delay if faults or problems occur when
operating your weed burner, or if accidents occur or nearly
occur.
Together with you we will find a solution to the problem and
allow the knowledge gained to flow into our subsequent work.
Safety

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1.4 Requirements for personnel
Handling the weed burner is only permitted for persons,
 who are at least 16 years old,
 who are physically and mentally suited to do so,
 who have read and understood this operating manual, and
 from whom it is expected that they responsibly perform the
tasks assigned to them.
Commissioning, maintenance, repair and disposal of the weed
burner may only be executed in a specialist workshop or by
persons with appropriate technical training and experience.
1.5 Danger zone
The danger zone is the area in which the safety or the health
of persons is jeopardised. Consequently no one should be in
this area when the weed burner is in operation.
WARNING!
There is a risk of injury to persons in the danger zone due to
burns on hot surfaces or the flame.
Consequently
 Only operate the weed burner if no one is in the danger
zone.
 Observe the danger zone carefully and switch off the weed
burner when people enter the danger zone.
 Before starting work, flammable foreign objects must be
removed from the surface to be processed. When working,
look for other flammable foreign bodies and remove them in
good time.
The danger zone is shown in the sketch (see Fig. 1, on the
next page):
A top view of the weed burner is shown. The shaded area is
the danger zone.
Safety

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NOTE
When the weed burner is pivoted to the left, this change in
direction also applies to the danger zone.
Safety
Fig. 1:
Danger zone

Limpar WKB 750 01.07.2019 Page 11 of 35
1.6 Work clothing
WARNING!
Unsuitable, loose work clothing, neckerchiefs, ties, scarves o
r
even long hair can be ignited by the weed burner.
Severe injuries are the result.
Therefore:
 When operating the weed burner, and for maintenance
and repair tasks, always wear suitable tight-fitting work
clothing.
 If you have long hair, also wear suitable protective clothing:
Hair net or head protection hood
 Since the possibility cannot be completely excluded that
burning or hot foreign objects may be present at the
operator workplace, protective equipment must be worn:
long, sturdy trousers, safety footwear and protective gloves.
1.7 Safety devices and protective devices
1.7.1 Safety switch
The switch bracket for gas flow of the flame unit is designed
as a dead man switch. The valve of the flame unit is opened
and the gas flows into the combustion chamber by pulling the
switch bracket against the swing arm tube.
To stop the gas flow, simply release the switch bracket.
1.7.2 Hose break safety device
The hose break safety device protects against uncontrolled
gas leakage in the event of a massive leak in the hose line.
Safety

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1.8 Safety regulations and accident
prevention regulations
Comply with the following instructions to avoid injury and
material damage. In addition, for commercial use comply with
the safety and accident prevention regulations issued by the
Employers Liability Insurance Associations.
 Only operate the weed burner with properly mounted safety
devices and protective devices (see section 1.7, page 11).
These devices may only be dismounted for maintenance
and repair tasks. After concluding these tasks the safety
devices and protective devices must be immediately
remounted. Otherwise there is significant danger of injury.
 Only use the weed burner for its intended use, otherwise
dangerous situations can occur with serious or fatal injuries
as the result (intended use: see section 1.1, page 7).
 Due to poor lighting conditions during operation a number
of dangers can occur. Only operate the weed burner if
there is adequate lighting.
 Ensure that the weed burner is switched off and that the
gas cylinder is closed when you leave the machine.
 The housing of the combustion chamber is extremely hot
during and directly after the tasks. Allow the weed burner to
cool before maintenance are performed or the burner is
transported.
 Do not touch hot surfaces (e.g. the combustion chamber).
 Maintain a safety distance of 1 m away from walls or
hedges. There is a risk of fire.
 Avoid using the weed burner on areas with dry, flammable
vegetation.
 Remove flammable waste (e.g. paper or plastic).
 To avoid fire, observe the treated area during and after
work.
Safety

Limpar WKB 750 01.07.2019 Page 13 of 35
 Use of the weed burner in the vicinity of explosive gases,
fumes or other dangerous substances is prohibited.
 Always carry sufficient quantities of extinguishing agent
with you (e.g. fire extinguisher).
 An operational fire extinguisher should always be fastened
on the weed burner.
 Follow the instructions on the fire extinguisher.
 Before each use, check the gas connections of the weed
burner. Use leakage spray.
 Maintenance and repair tasks may only be executed by the
specialist dealer or by specialised personnel.
 Comply with the safety information that is affixed on the
weed burner. Safety stickers must not be removed. If they
have become unrecognisable or have been lost, they must
be replaced (for the meaning of the stickers: see section
1.10, page 15). Contact your specialist dealer to order new
stickers.
 Wear tight-fitting clothing. Long hair must be tied back.
 Do not operate the machine in a faulty
condition as this may result in considerable risk of injury. If
errors occur, switch off the weed burner and immediately
close the gas valve of the gas cylinder. Initiate the repair.
 Propane is heavier than air. Therefore, do not park the
weed burner over a cellar shaft or other recesses.
 Store the cooled weed burner in well-ventilated rooms.
 Follow the instructions of your gas supplier regarding
storage, transport and the filling of gas cylinders.
Safety

Page 14 of 35 01.07.2019 Limpar WKB 750
 Switch off the weed burner before maintenance and repair
tasks, including cleaning tasks and turn off the gas tap of
the gas cylinder. Ensure that no other person can switch
the machine back on again (e.g. pull off the spark plug
connector; unscrew the hose from the gas cylinder).
Otherwise there is danger of injury.
 Only use original spare parts and accessories that are
approved by the manufacturer. The use of other parts voids
the liability for the ensuing consequences.
 Execution of the specified maintenance and repair tasks is
part of intended use of the weed burner; intended use
particularly includes compliance with the maintenance
intervals. If you do not execute these tasks, faultless
function cannot be ensured. Dangers for personnel and
objects can occur. We recommend that you keep
maintenance logs.
1.9 Disposal
After its service life, only have qualified specialists dispose of
the weed burner. The manufacturer assumes no liability for
damage that occurs due to improper disposal.
Safety

Limpar WKB 750 01.07.2019 Page 15 of 35
1.10 Safety signs on the weed burner
Warning!
Danger of injury due to ignorance of the danger zones.
The stickers attached on the weed burner contain warnings of
specific dangers as well as instructions for correct operation. The
stickers supplement the instructions specified in this manual.
Therefore:
 Always comply with the warnings affixed on the weed burner.
 Do not remove any warning stickers
 Replace warning stickers that come off of the machine or that
have already been lost.
Stickers Meaning
Before using the weed burner, the
operating manual must be read. All
information contained in the operating
manual must always be complied with.
Position: On the handlebar in the
operator's field of vision.
Warning – general dangers.
Position: On the rear of the machine in the
operator’s field of vision.
Warning – hot surface.
Position: Lasered into the combustion
chamber.
Fire hazard
Maintain distance.
Position: On the rear of the machine in
the operator’s field of vision.
Safety

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The weed burner Limpar WKB 750 is used to remove weeds
from paved areas outside closed rooms using the heat of the
flames.
The machine consists of a sheet steel chassis on which a
propane gas cylinder is positioned. The gas cylinder is
connected to a flame unit. The gas is ignited in the combustion
chamber by an ignition electrode.
The combustion chamber is permanently mounted to the
chassis.
The weed burner has a handlebar, with which it is guided by a
pedestrian, and from which all operating elements can be
reached.
2.1 Rating plate
A rating plate is attached on the machine, it contains the basic
data for the machine (see Fig. 2). The type plate is located at
the rear of the weed burner.
2 Description
Description
Fig. 2: Rating plate

Limpar WKB 750 01.07.2019 Page 17 of 35
2.2 Overview
Description
Switch
bracket
Combustion
chamber
Ignition
button
Lashing strap
Chassis
Fire
extinguisher
Valve of the
propane gas
cylinder
Pushbutton
hose break
safety device
11 kg
Propane gas cylinder
(Not included in the
Pressure
Skid
Spark plug connector

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2.3 Technical data
Dimensions, weight, type of gas
Work width 75 cm
Weight without gas cylinder 35 kg
Gas type Propane
Gas supply (not included in the scope
of delivery) One 11 kg gas cylinder
Gas pressure 0.5 - 4 bar
Gas consumption per hour 4.8 kg/h
Power 60 kW
Average. Temperature approx. 1000 °C
Ignition Electronic
Battery Size AA; 1.5 V
Description

Limpar WKB 750 01.07.2019 Page 19 of 35
3 Commissioning
CAUTION!
Danger of injury and danger of material damage due to
improper assembly of the weed burner.
Therefore:
 The completion and all necessary adjustments, incl. trial
run, are included in the scope of delivery and must be
executed by the specialist dealer prior to transfer to the
customer!
We recommend that two people assemble the weed burner.
3.1 Unpacking
 Place the packed weed burner on level ground
 Open the box on the top
 Cut open the corners of the box to the floor.
 Set up the handlebar in accordance with section 3.2 and
roll the weed burner off the packaging.
 Before putting the weed burner into operation, remove the
protective film completely from the combustion chamber
(see Fig. 3, page 17).
 Dispose of the packaging in accordance with the waste
disposal regulations issued by your municipal
administration.
3.2 Mounting the handlebar
See Fig. 3, page 17 for instructions on mounting the
handlebar. Height adjustment is not possible.
Danger of injury and danger of material damage when raising
the steering arm.
When raising the handlebar, there is a risk of crushing between
the handlebar and the chassis.
Bowden cables can be pinched and damaged when lifting up
the steering arm.
 Carefully lift up the steering arm.
 When lifting up the steering arm pay attention to the Bowden
cables.
Commissioning

Page 20 of 35 01.07.2019 Limpar WKB 750
 Swing the handlebar into operating position.
 Slide the handlebar core into the tube of the handlebar
and align the bores.
 Fix the first end of the handlebar in place as shown in Fig.
4. Do not tighten the screw connection firmly yet.
 Repeat the procedure on the other side.
 Firmly tighten the threaded unions of handlebar.
Fig. 4: Sectional view of handlebar threaded union
Stop nut M10
Chassis
Handlebar
Washer
Ø 10.5
Truss-head screw
M10x40
Washer
Ø17
Handlebar
Direction of movement
Commissioning
Handlebar core
Here flush with the
end of the handlebar
Here flush with the
end of the handlebar