Lagler HUMMEL User guide

BELT SANDING MACHINE HUMMEL®
HUMMEL
®
English / Englisch
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Operation,
Maintenance, Safety
Translation of original operating instructions
for the belt sanding machine
00.100.20.002 01.12.2012 *00.100.20.002*

HUMMEL®01.12.2012
English / Englisch
HUMMEL®- ASSEMBLIES
Fig. 1 Assemblies of the HUMMEL®belt sanding machine
Cable support with
strain relief ring
ON/OFF switch
Switch box
Lowering
lever
Handle
Guide tube
Safety guard
Side cover
Lateral wheel
Drive motor
Belt guard
Bumper felt
Operating lever,
drive unit
Dust bag
Bracket
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CONTENTS
1 Introduction.....................................................................................................................................................................4
1.1 Features of the machine ................................................................................................................................................4
1.2 Description of the machine ...........................................................................................................................................4
1.3 Intended use of the machine.........................................................................................................................................4
1.4 Safety devices.................................................................................................................................................................4
2 Hazard warnings and safety instructions ....................................................................................................................5
2.1 Hazard warnings.............................................................................................................................................................5
2.2 General safety instructions ...........................................................................................................................................8
3 Technical data...............................................................................................................................................................10
4 Commissioning..............................................................................................................................................................12
4.1 Preparing the machine for operation .........................................................................................................................12
4.2 Connecting the power cable .......................................................................................................................................15
4.3 Switching on the machine...........................................................................................................................................16
4.4 Switching off the machine...........................................................................................................................................18
5 Working with the HUMMEL®.......................................................................................................................................19
5.1 Application tips.............................................................................................................................................................19
5.2 Changing the sanding belt...........................................................................................................................................20
5.3 Regulating the sanding drum pressure ......................................................................................................................22
5.4 Emptying the dust bag..................................................................................................................................................23
6 Transport and storage..................................................................................................................................................24
6.1 Dismantling the machine before transportation .......................................................................................................25
6.2 Assembly after transportation ....................................................................................................................................27
6.3 Storage ..........................................................................................................................................................................28
7 Maintenance work and replacement of wearing parts............................................................................................29
7.1 Cleaning and care instructions...................................................................................................................................30
7.2 Lubrication ....................................................................................................................................................................33
7.3 Checking and setting the sanding belt tracking........................................................................................................33
7.4 Checking the machine setting.....................................................................................................................................36
7.5 Checking the dust pick-up...........................................................................................................................................38
7.6 Replacement of sanding drum ....................................................................................................................................38
7.7 Replacement of tensioning roller................................................................................................................................39
7.8 Replacement of rear wheel .........................................................................................................................................41
7.9 Replacement of lateral wheels ...................................................................................................................................42
7.10 Replacement and tensioning of V-belts .....................................................................................................................42
8 Regular maintenance and testing in accordance with accident prevention regulations ....................................46
9 Causes of faults ............................................................................................................................................................48
10 Circuit diagrams............................................................................................................................................................53
11 Spare parts....................................................................................................................................................................56
12 Service passport...........................................................................................................................................................71
13 EU Declaration of conformity ......................................................................................................................................72
WARNING! Death, severe physical injury or significant property damage can occur if the
corresponding cautionary measures are not taken!
CAUTION! Moderate to light physical injury or property damage can occur if the corresponding
cautionary measures are not taken!
ATTENTION! An undesired event can occur if the corresponding instructions are not followed!
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INTRODUCTION
1.1 FEATURES OF THE MACHINE
Figure 1 (page 2) shows the most important assemblies which
make up the HUMMEL®. We recommend that you take some time
to become familiar with the machine.
1.2 DESCRIPTION OF THE MACHINE
The HUMMEL®belt sanding machine operates with a contact
sanding drum featuring a specially profiled rubber coating. The
belt tensioning fixture with integrated automatic belt guidance is
located vertically above the sanding drum. The work zone is covered
by the machine housing and detachable side cover. On the machine
housing, the electric motor is fixed in a motor bearing bracket. The
plug for connection to the mains is located at the switch box of the
motor. The motor switch with the switch positions START / WORKING
and TEST is located at the switch box. On the left under the belt
guard is the belt drive unit. The machine is moved by means of a
steering wheel at the back and two lateral wheels. Two handles are
attached to the guide tube, where the drum lowering lever is also
located and the cables and dust bag are attached.
1.3 INTENDED USE OF THE MACHINE
The HUMMEL®belt sanding machine is suitable for dry sanding
woodenandcork floors,plasticskating rinksandtartan running tracks.
A specially equipped version of the machine can be used to sand
sheet metal surfaces.
Any application other than that described here is inadmissible
without the consent of the manufacturer!
1.4 SAFETY DEVICES
The following parts of the machine are safety devices and must
accordingly be kept in perfect working order:
Sealing felt = Dust shield
Side cover = Dust shield, sanding belt protection
Machine housing = Sanding belt protection
Belt guard = V-belt protection
Introduction
1
WARNING!
RISK OF DEATH from electrical shock:
The machine may never be used for wet
processing operations of any kind!
You have purchased a high-quality product
from LÄGLER®. We wish you a great deal of
success with your HUMMEL®. All LÄGLER®
products are subjected to a thorough
inspection before leaving the factory.
Please read these operating instructions
completely before you begin working
with your HUMMEL®. These operating
instructions include important information
on occupational safety and will provide
you with answers to many questions so
that you can work with the machine safely
and without any problems. If you cannot
find a specific subject in these operating
instructions, please read the LÄGLER®
application technique guidelines “Sanding
of wooden floors” (http://www.laegler.com)
or contact our service department, your
retailer or your importer.
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HAZARD WARNINGS AND SAFETY INSTRUCTIONS
2.1 HAZARD WARNINGS
WARNING!
RISK OF DEATH from suffocation and RISK OF INJURY:
• Never wrap the power cable around your neck or other
parts of the body!
RISK OF DEATH from electrical shock:
• The machine may never be used for wet processing
operations of any kind!
• Do not expose the machine to rain! Do not use the machine
in moist or wet environments!
• To protect yourself and the machine against faults in the mains
supply use a safety switch (for German mains supply Part
number in Section 11, Spare parts)!
Note the valid regulations and legal conditions in your
country!
• The machine must be switched off and the power plug must
be removed from the socket during all maintenance work and
work on the electrical equipment!
• Avoid body contact with grounded parts, e.g. pipes, radiators,
ovens, refrigerators!
• The quality of the motor cable and the power cables must
match the quality of the original LÄGLER®cable!
• The power cables must be protected from mechanical and/
or electrical damages in the workplace!
• Do not carry or pull by the machine by the cable! Do not pull
on the cable to remove the plug from the socket! Protect the
cable against heat, oil and sharp edges!
WARNING!
RISK OF DEATH, RISK OF INJURY, RISK OF
FIRE:
• Be certain to read the hazard warnings
and safety instructions before using the
machine!
• Instructyourco-workers andcolleagues
accordingly! Otherwise, these persons
could be exposed to danger or injured!
ATTENTION!
• Keep these hazard warnings and safety
instructions in a safe place!
• Note the valid regulations and legal
conditions in your country!
Hazard warnings and safety instructions
2
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WARNING!
RISK OF EXPLOSION due to sparks while sanding or a high dust
concentration in the air:
• Do not use the machine near
- sources of fires,
- flammable liquids or gases,
- potentially explosive areas!
• Do not smoke in a dusty environment, e.g. while sanding or
emptying the dust bag!
RISK OF FIRE from spontaneous combustion or from sparks while
sanding:
• There is a high risk of fire when sanding woods with a large
amount of resin, oiled or waxed floors or metal! Therefore,
the machine must always be cleaned carefully directly after
sanding! Be certain to note the warning notices of the paint,
oil and wax manufacturers!
• Cloths, pads, et cetera which have been immersed in oil or wax
can spontaneously combust! Be certain to note the warning
notices of the paint, oil and wax manufacturers!
• The dust bag must always be removed from the machine
after sanding and emptied into a non-combustible container
outdoors! Cover this container with a non-combustible
cover and be certain to store it and the dust bag outdoors
(Section 5.4, Emptying the dust bag)!
RISK OF FIRE from the overheating of the cables:
• Only the following motor cables and power cables may be
used:
- machines with motor for mains voltage 220 V or 230 V:
3 wires with wire cross-sections of at least 2.5 mm²
- machines with motor for mains voltage 400 V:
5 wires with wire cross-sections of at least 1.5 mm²
HAZARD WARNINGS AND SAFETY INSTRUCTIONS
2
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WARNING!
HEALTH RISK caused by dust:
• Make sure that the dust bag is properly fastened to the
machine!
• If the machine is operated correctly, the mandatory dust
emission values will not be exceeded! When emptying the
dust bag outdoors, a respiratory protective mask (at least
filter class P2) must be worn!
• A respiratory protective mask (at least filter class P2) must
be worn when conducting other work that creates dust, e.g.
cleaning of the machine!
CAUTION!
RISK OF INJURY and RISK OF PROPERTY DAMAGE from rotating
tools and parts of the machine:
• Before switching on the machine, make sure that all tools
and adjustment tools have been removed from the machine!
• The machine may not be started when tilted backward or
forward!
• The machine may not be started if the sanding drum is on the
floor!
• Do not reach into rotating tools or parts of the machine!
• Do not let children or other persons touch the machine or
cable and keep them out of the work area!
• Do not wear any long articles of clothing or jewellery! These
could be caught by moving parts!
RISK OF INJURY and RISK OF PROPERTY DAMAGE from uninten-
tional starting of the machine:
• The power plug must be removed from the socket when the
machine is switched off!
• Make sure that ON/OFF switch is not set to ON when
connecting the machine to the mains supply!
HAZARD WARNINGS AND SAFETY INSTRUCTIONS
2
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CAUTION!
RISK OF INJURY and RISK OF PROPERTY DAMAGE from the rolling
away, tipping or falling of the machine:
• The machine must be secured against rolling away, tipping
or falling when not in use!
Always ensure that the machine is standing securely!
RISK OF INJURY and RISK OF PROPERTY DAMAGE from unsuitable
parts:
• Only use tools, accessories and spare parts from LÄGLER®
for the HUMMEL®( Section 11, Spare parts)! There is no
guarantee for external parts or liability for damage caused
by them!
HEALTH RISK caused by noise:
• Use hearing protection when conducting work that produces
noise!
RISK OF PROPERTY DAMAGE:
• Do not store the unused machine on the sanding drum!
Otherwise the sanding media can cause scratches on the
ground or the sanding drum can be damaged!
• Improper transport will result in damage to the machine!
2.2 GENERAL SAFETY INSTRUCTIONS
• Provide good illumination in the workplace!
Well lit construction sites reduce the risk of injury and allow
you to better evaluate the quality of your work.
• Keep your work area clean!
Untidy work area create a risk of accidents.
• Use the proper machines!
Do not use low-performance machines or additional devices
for heavy jobs. Do not use the machine for purposes and work
that it is not intended for.
• Do not overload the machines!
It works better and more safely in the power range noted.
HAZARD WARNINGS AND SAFETY INSTRUCTIONS
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• Do not bend too far over the machines!
Avoid unnatural postures. Make sure that you stay in a stable
position and keep your balance at all times.
• Be attentive!
Pay attention to your work. Work carefully and do not use the
machines if you are not concentrating.
• Maintain your machines with care!
Keep your machines clean so that you can work better and
more safely. Follow the maintenance guidelines and the
instructions for replacing tools. Regularly inspect the cable
and have it replaced by a qualified electrician if it is damaged.
Inspect the extension cable regularly and replace it if it is
damaged. Keep the handles dry and free of oil and grease.
• Check your machines for damage!
Before using the machines, you must inspect the safety
devices or damaged parts carefully to ensure that they are
working perfectly and as intended. Check whether the moving
parts are working properly, that they are not sticking, that no
parts are broken, whether all parts are in perfect condition
and installed properly and whether all other conditions which
could influence the operation of the machine are in order.
Damaged safety devices and parts must be properly repaired
or replaced by an authorized service shop insofar as nothing
to the contrary is indicated in the operating instructions.
Damaged switches must be replaced by a qualified
electrician. Do not use the machine if it cannot be started or
switched off by using its switch.
• Store your machines safely!
Store your unused machines in a dry, closed location out of
the reach of children!
HAZARD WARNINGS AND SAFETY INSTRUCTIONS
2
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TECHNICAL DATA
Manufacturer....................................................... Eugen Lägler GmbH
Machine type.................................................... belt sanding machine
Serial number ................................................................see type plate
Year of manufacture......................................................see type plate
Motor type.......................................................single-phase AC motor
- Voltage................................................................230 V | .......... 220 V
- Frequency ............................................... 50 Hz (CPS) | 60 Hz (CPS)
- Output.............................................................. 2.2 kW | ........2.9 kW
- Necessary fuse protection of mains supply.....16 A | ............20 A
- Starting capacitor .............................................60 µF | ........ 130 µF
- Running capacitor............................................. 40 µF | .......... 40 µF
Motor type........................................................ three-phase AC motor
- Voltage........................................................................................ 400 V
- Frequency ........................................................................50 Hz (CPS)
- Output.......................................................................................4.0 kW
- Necessary fuse protection of mains supply.............................16 A
Insulation class ...................................................................................B
Protection class ............................................................................IP 54
Safety devices......................................................no-voltage release,
temperature switch as overload
protection in the motor
Drum diameter.......................................................175.5 mm (~ 6 7/8“)
Drum width................................................................200 mm (~ 7 7/8”)
Drum speed................................................................ 2400 1/min (rpm)
Dimension of the sanding belt ...... 200 x 750 mm (~ 7 7/8” x 29 1/2”)
Overall length of the machine................................... 1040 mm (~ 41“)
Overall width of the machine......................................360 mm (~ 14“)
Overall height of the machine.............................1020 mm (~ 40 1/8“)
Weight of the machine housing..................................41 kg (~ 90 lbs)
Weight of the motor .....................................................34 kg (~ 75 lbs)
Weight of the guide tube.................................................4 kg (~ 9 lbs)
Overall weight of the machine..................................79 kg (~ 174 lbs)
Dust emissions at workplace.............. < 1 mg/m³ (~ 0.012 gr./cu.yd.)
(measured as per the testing requirements GS-HO-15 of
German statutory accident insurance DGUV)
Workplace-related noise emission values...........................76 dB(A)
Measurement uncertainty constant of the
noise emission values............................................................4 dB (A)
Vibration total value ahv ........................................................< 2.5 m/s²
(measured at the handle)
Technical data
3
NOTE on noise emission:
The values indicated are emission values
and must not represent safe workplace
values as well.
Although a correlation exists between
emission levels and immission levels, it is
not always possible to determine whether
additional precautionary measures are
required.
Factors that can have an effect on the
immission level existing at the workplace
include the duration of the effects, the
characteristics of the work area and
other sources of noise, e.g. the number of
machines and processing operations in the
vicinity. The permissible workplace values
may also vary from country to country.
This information, however, is intended
to enable the user to better estimate the
dangers and risks.
NOTE:
The motor data indicated here refers to
machines used in Germany or USA. Exported
machines may have other data that can be
seen on the motor type plate.
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TECHNICAL DATA
Intended applications
Sanding wooden and cork floors, plastic skating rings, with special
version also machining of sheet metal surfaces.
Basic equipment
Machine ready for operation, dust bag, MultiClip for dust bag fixture,
cable support, 10 m extension cable 3 x 2.5 mm² (or 5 x 1.5 mm² for
three-phase AC motor), O-ring as a strain relief device, operating
instructions with safety remarks, tool kit complete with closed mouth
wrench size 13/10 mm, open-mouth wrench size 17 mm, hexagonal
socket wrench size 4 mm, 5 mm and 6 mm, setting fixture, box wrench
and respiratory protection mask P3.
Optional equipment
Carrying handle, TransCart, pocket for ear plugs, safety switch for
fault current PRCD-S (for German mains supply), safety belt.
Wearing parts
Please check the condition of the wearing parts mentioned below
at regular intervals in order to be able to work safely and optimally
at all times.
Replace the following parts in case of wear and/or damage:
• Extension cable
• Motor cable
• Sealing felt
• MultiClip
• V-belts
• V-belt pulleys
• Belt tensioner
• Sanding drum
(after daily use, exchange every 1 - 2 years)
• Tensioning roller of the drive unit
(after daily use, exchange every 1 - 2 years)
• Guide rollers at the drive unit
• Guide roller at the machine housing
• Side cover
• Dust bag
• O-ring used as a strain relief
• Back wheel
• Lateral wheels
3
WARNING!
RISK OF DEATH from electrical shock:
The machine may never be used for wet
processing operations of any kind!
NOTE:
You will find the corresponding part numbers
for the optional equipment and wearing
parts in Section 11, Spare parts.
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COMMISSIONING
Commissioning
This section describes the procedure for commissioning the
HUMMEL®on site. In order to exclude the possibility of damage and
malfunctions, it is essential to proceed in the sequence outlined
below.
CAUTION!
RISK OF INJURY and RISK OF PROPERTY DAMAGE:
Before working with the machine for the first time, operating
staff must be adequately instructed!
4.1 PREPARING THE MACHINE FOR OPERATION
1Unpack the machine carefully. The bottom part of the supplied
transport crate makes a useful container for storage or
transportation of the machine ( Section 6, Transport and
storage). Please ensure that the packaging materials are
responsibly disposed of.
2Press the lowering lever at the handle downwards (Fig. 2, 1.).
3Insert the guide tube into the opening in the machine housing
and at the same time insert the upper rod into the lower rod
(Fig. 2, 2).
4Carefully tighten the wing screw at the lower rod (Fig. 3) and
the wing nut at the machine housing (Fig. 4).
Fig. 2 When inserting the guide tube, make sure that
the upper rod of the lowering mechanism feeds
in correctly!
Fig. 3 After inserting the guide tube, carefully tighten
the wing screw at the lower rod.
Fig. 4 After inserting the guide tube, carefully tighten
the wing nut at the machine housing.
4
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COMMISSIONING
5Lift the sanding drum off the floor by turning the lowering
lever at the handle upwards (Fig. 5).
6Hook the cable support into the bracket at the top of the guide
tube (Fig. 6)
7Fasten the dust bag firmly using the cord and the MultiClip
at the end of the guide tube (Fig. 7). Ensuring when mounting
that the opening of the guide tube is not closed.
8Release the cover lock (Fig. 8, 1.) and remove the side cover
on the right of the machine housing (Fig. 8, 2.).
9Pull the operating lever of the drive unit upwards (Fig. 8, 3.).
This will lower the tensioning roller.
10 Position the sanding belt on the tensioning roller of the drive
unit (Fig. 9) and push it over the tensioning roller and the
sanding drum (Fig. 10).
Fig. 6 Hook the cable support into the bracket at the
guide tube.
Fig. 7 Mount the dust bag using the cord (1.) and the
MultiClip (2. and 3.) at the end of the guide tube.
Fig. 8 Release the cover lock (1.), remove the side
cover (2.) and lower the tensioning roller by pulling
up the operating lever (3.).
Fig. 9 Position the sanding belt on the tensioning roller
of the drive unit.
Fig. 10 Push the sanding belt far enough over the sanding
drum and tensioning roller so that the sanding
drum is fully covered by the sanding belt.
4
Fig. 5 Lift the sanding drum off the floor by turning the
lowering lever at the handle upwards.
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COMMISSIONING
Fig. 12 Tension the sanding belt by lowering the operating
lever. Otherwise, damage or injury can occur!
11 Position the sanding belt so that it evenly covers the sanding
drum (Fig. 11, A).
WARNING!
RISK OF FIRE from the formation of sparks while sanding:
Position B of the sanding belt in Fig. 11 provoke sparking during
sanding! Avoid this without fail!
12 To tension the sanding belt, press the operating lever of the
drive unit downwards (Fig. 12). Otherwise, damage or injury
can occur!
13 Connect the machine to the mains supply ( Section 4.2,
Connecting the power cable).
CAUTION!
RISK OF INJURY and RISK OF PROPERTY DAMAGE from rotating
parts of the machine:
• Always tension the sanding belt before switch on the
machine (Fig. 12)!
• Always lift the sanding drum off the floor before switch on
the machine (Fig. 14)!
14 Before sanding, the precise tracking of the sanding belt
must be checked! Adjusted it if necessary ( Section 7.3,
Checking and setting the sanding belt tracking)!
CAUTION!
RISK OF INJURY and RISK OF PROPERTY DAMAGE from rotating
parts of the machine:
• Never reach into the area of the sanding belt while it is
running!
• During the test run, ensure that no objects randomly
positioned in the vicinity can be picked up by the sanding
belt and no other persons are in the danger area!
4
Fig. 11 Position the sanding belt so that it evenly covers
the sanding drum (A). Avoid position B without
fail (risk of fire)!
Fig. 13 Mount the side cover.
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15 After the checking and setting of the sanding belt tracking
mount the side cover (Fig. 13).
16 The machine is now ready for operation ( Section 4.3,
Switching on the machine).
4.2 CONNECTING THE POWER CABLE
WARNING!
RISK OF DEATH from electrical shock:
• To protect yourself and the machine against faults in the
mains supply use a safety switch PRCD (for German mains
supply Part number in Section 11, Spare parts)!
• Observe the applicable regulations and legal requirements
for your country!
1Lift the sanding drum off the floor by turning the lowering
lever at the handle upwards (Fig. 14).
2Insert the plug of the motor cable in the coupler of the
extension cable (Fig. 15, 1.).
3Fasten the strain relief ring on the extension cable (Fig. 15, 2.)
and mount the strain relief ring on the cable support (Fig. 16).
4Plug in the extension cable to a adequately fused mains socket
with PE contacts.
COMMISSIONING
4
Fig. 15 Insert the plug of the motor cable in the coupler
of the extension cable (1.). Fasten the strain relief
ring on the extension cable (2.).
Fig. 16 Mount the strain relief ring on the cable support.
Fig. 14 Lift the sanding drum off the floor by turning the
lowering lever at the handle upwards.
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4.3 SWITCHING ON THE MACHINE
CAUTION!
RISK OF INJURY and RISK OF PROPERTY DAMAGE from rotating
parts of the machine:
• Always tension the sanding belt before switch on the
machine (Fig. 12)!
• Always lift the sanding drum off the floor before switch on
the machine (Fig. 14)!
• Never allow the machine to run unattended!
4.3.1 MACHINES WITH SINGLE-PHASE AC MOTOR
(MAINS VOLTAGE 230 V AND 220 V)
1Lift the sanding drum off the floor by turning the lowering
lever at the handle upwards (Fig. 14)!
2To switch on the machine turn the switch button at the motor
to position -START- and hold the switch button for around 2
seconds in this position (Fig. 17).
3Once the motor has reached its full speed, release the switch
button. The switch button will then automatically move to
position -BETRIEB (WORKING)- (Fig. 18).
ATTENTION!
Remaining for too long in the switch position -START- shortens
the service life of the starting capacitor!
4.3.2 MACHINES WITH THREE-PHASE AC MOTOR
(MAINS VOLTAGE 400 V)
1Lift the sanding drum off the floor by turning the lowering
lever at the handle upwards (Fig. 14)!
2To switch on the machine turn the switch button at the motor
to position -START- (Fig. 19) and release the switch button
after the motor has reached its full speed. The switch button
will then automatically move to position -1- (Fig. 20).
COMMISSIONING
4
Fig. 17 To switch on the machine turn the switch button at
the motor to position -START- and hold the switch
button for around 2 seconds in this position.
Fig. 18 Once the motor has reached its full speed,
release the switch button. The switch button will
then automatically move to position -BETRIEB
(WORKING)-.
Fig. 20 Release the switch button. The button turns
automatically in position -1-.
Fig. 19 To switch on the machine turn the switch button
at the motor to position -START-.
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If the motor do not start in the switch position -START- (Fig. 21, 1.)
and the light on the switch box shines (Fig. 21, 2.), the rotation
direction of the motor is wrong.
To change the rotation direction of the motor using the following
procedure:
1Disconnect the motor cable from extension cable.
2Put a screwdriver in the slit of the phase changing switch in
the plug of the motor cable (Fig. 22, 1.).
3Original LÄGLER®plug with red nut at the cable outlet:
To unlock the phase changing switch press the screwdriver
in the slit and at the same time turn the screwdriver at 180°
(Fig. 22, 2.).
Original LÄGLER®plug with yellow nut at the cable outlet:
To unlock the phase changing switch turn the screwdriver at
180° against a small resistance (Fig. 22, 2.).
ATTENTION!
The phase changing switch can only be turned in one direction!
4.3.3 GENERAL
If the motor should ever be difficult to start in extremely cold
conditions proceed as follows:
1Switch off the machine ( Section 4.4, Switching off
the machine) and remove the V-belts ( Section 7.10,
Replacement and tensioning of V-belts).
2Switch on the machine without V-belts ( Section 4.3,
Switching on the machine).
3Once the motor is up to operating temperature, switch off
the machine ( Section 4.4, Switching off the machine)
and mount the V-belts ( Section 7.10, Replacement and
tensioning of V-belts).
COMMISSIONING
4
Fig. 21 The motor do not start in switch position -START-
(1.) and the light on the switch box shines (2.).
Fig. 22 Change the rotation direction of the motor by
turning the phase changing switch at 180°.
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4.4 SWITCHING OFF THE MACHINE
1Before switch off the machine lift the sanding drum off the
floor by turning the lowering lever at the handle upwards
(Fig. 23).
2Turn the switch button to position -0- (Fig. 24).
3Wait until the sanding drum comes to a standstill!
CAUTION!
RISK OF INJURY and RISK OF PROPERTY DAMAGE:
• Always remove the power plug from the socket after you
have switched off the machine!
• Secure the machine against sliding! For example, place a
flat piece of wood between the floor surface and machine
housing (Fig. 25).
ATTENTION!
Do not store the unused machine on the sanding drum!
Otherwise the sanding media can cause scratches on the
ground or the sanding drum can be damaged!
Fig. 23 Lift the sanding drum off the floor by turning the
lowering lever at the handle upwards.
Fig. 24 To switch off the machine turn the switch button
to position -0-.
Fig. 25 Secure the machine against sliding!
COMMISSIONING
4
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HUMMEL®01.12.2012
English / Englisch
WORKING WITH THE HUMMEL®
Working with the HUMMEL®
5.1 APPLICATION TIPS
ATTENTION!
• Always sand from left to right! This ensures that the left-
hand lateral wheel always runs over the newly sanded
surface, making the surface more even with each sanding
pass and preventing waviness!
• One sanding track comprises a forward and reverse
movement over the same lane without offset!
• We advise a sanding track offset of 50%!
• Deep sanding marks due to the selection of a too coarse grit
grade can be prevented by starting the first sanding operation
with the finest grit grade possible.
• Carry out a test sanding process using a 50 or 60 grit grade
(a few test sanding tracks). If this test is satisfactory and you
envisage a good sanding result within a reasonable period,
it is more efficient to start the sanding work with these finer
grit grade.
• Prevent sanding marks made by previously used grit grade by
adhering to the order of the sandpaper grit grade and never
skip more than one grit grade.
• Always vacuum the floor thoroughly before the first sanding
operation and after each additional one.
• Clean the wheels of the machine before starting each new
sanding operation.
• In order to avoid chatter marks, use sanding belts with bud
joints and tape.
• After replacing the sanding belt, start working in poorly lit
areas of the room in order to remove the initial aggressiveness
of the sanding medium.
5
NOTE:
For more information free of charge, please
contact: within Germany
- Telephone: 0800 / 52 34 537
- Fax: 0800 / 48 66 353
within the USA
- Telephone: [phone]
or
- Telephone: 0049 - 7135 - 98 90 - 0
- Fax: 0049 - 7135 - 98 90 - 98
- E-mail: [e-mail]
- Internet: http://www.laegler.com
You will also find important and interesting
application tips in the LÄGLER®application
technique guidelines “Sanding of wooden
floors” (http://www.laegler.com)!
WARNING!
RISK OF DEATH from electrical shock:
The machine may never be used for wet
processing operations of any kind!
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HUMMEL®01.12.2012
English / Englisch
WORKING WITH THE HUMMEL®
5.2 CHANGING THE SANDING BELT
Depending on the type of sanding process you wish to perform,
different abrasive grit grades can be selected. In order to change
the abrasive, proceed as follows:
1Lift the sanding drum off the floor by turning the lowering
lever at the handle upwards (Fig. 26).
2Switch off the machine and pull the power plug out of the
socket!
3Release the cover lock (Fig. 27, 1.) and remove the side cover
on the right of the machine housing (Fig. 27, 2.).
4To release the tension of the sanding belt, pull the operating
lever of the drive unit upwards (Fig. 27, 3.). This will lower the
tensioning roller.
5Remove the worn sanding belt from the tensioning roller and
the sanding drum (Fig. 28).
6Position the new sanding belt on the tensioning roller of the
drive unit (Fig. 29) and push it over the tensioning roller and
the sanding drum (Fig. 30).
Fig. 27 Release the cover lock (1.), remove the side
cover (2.) and lower the tensioning roller by pulling
up the operating lever (3.).
Fig. 28 Remove the sanding belt.
Fig. 29 Position the new sanding belt on the tensioning
roller of the drive unit.
5
Fig. 26 Lift the sanding drum off the floor by turning the
lowering lever at the handle upwards.
Fig. 30 Push the sanding belt far enough over the sanding
drum and tensioning roller so that the sanding
drum is fully covered by the sanding belt.
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