Lagler HUMMEL User guide

Operation,
Maintenance, Safety
Operating instructions for the belt sanding machine
BELT SANDING MACHINE HUMMEL
HUMMEL
CAN
GB
NZ
USA
AUS
IRL

2
HUMMEL - ASSEMBLIES
Cable support
On/Off switch
Switch box
Fig. 1 Assemblies of the HUMMEL belt sanding machine
Lowering lever
Handle
Dust bag
Safety guard
Side cover
Lateral wheel
Drive motor
Bracket
Belt guard
Bumper felt
Operating lever,
drive unit

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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 Danger warnings..........................................................................................................................................................5
1.5 Safety devices..............................................................................................................................................................6
2. Technical data ..............................................................................................................................................................6
3. Commissioning..............................................................................................................................................................8
3.1 Preparing the machine for operation.........................................................................................................................8
3.2 Starting the machine..................................................................................................................................................10
3.3 Switching off the machine.........................................................................................................................................10
4. Working with the HUMMEL.......................................................................................................................................11
4.1 Application tips...........................................................................................................................................................11
4.2 Changing the sanding belt.........................................................................................................................................12
4.3 Regulating the sanding drum pressure....................................................................................................................13
4.4 Emptying the dust bag................................................................................................................................................13
5. Transport and storage................................................................................................................................................14
5.1 Dismantling the machine...........................................................................................................................................14
5.2 Assembly after transportation..................................................................................................................................15
5.3 Storage........................................................................................................................................................................15
6. Maintenance...............................................................................................................................................................16
6.1 Cleaning and care instructions.................................................................................................................................16
6.2 Lubrication..................................................................................................................................................................18
6.3 Checking sanding belt regulation.............................................................................................................................18
6.4 Checking the machine setting...................................................................................................................................19
6.5 Checking the dust pick-up.........................................................................................................................................21
6.6 Replacement of wearing parts..................................................................................................................................21
6.7 Regular maintenance and testing in accordance with accident prevention regulations..................................26
7. Troubleshooting..........................................................................................................................................................27
8. General safety remarks .............................................................................................................................................28
9. Circuit diagram...........................................................................................................................................................31
10. Spare parts..................................................................................................................................................................34
11. Service passport ........................................................................................................................................................47
12. Declaration of conformity..........................................................................................................................................48
CONTENTS

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The belt sanding machine HUMMEL is only us-
ablefordryprocessing.Never useyourHUMMEL
for wet processing (Danger!).
INTRODUCTION
1.1 FEATURES OF THE MACHINE
Fig.1(page2)showsthemostimportantassemblieswhichmakeup
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 sand-
ing drum featuring a specially profiled rubber coating. The belt
tensioningfixturewithintegratedautomaticbeltguidanceislocated
vertically above the sanding drum. The work zone is covered by
the machine housing and detachable side cover. On the machine
housing,the electricmotor is fixedin a motorbearing bracket. The
plugfor connectionto the mainsis located atthe switch boxof the
motor. The motor switch with the switch positions START / WORK-
ING 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.
The HUMMEL belt sanding machine is intended for dry use only.
Never attempt to use the HUMMEL for any wet process (risk of
fatal accidents)!
1.3 INTENDED USE OF THE MACHINE
TheHUMMELbeltsandingmachineissuitableforsandingwooden
and cork floors, plastic skating rinks and tartan 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. Never use for wet sand-
ing processes!
Introduction
1
You are now the owner of a high-quality
product from LÄGLER. We wish you every
success with the HUMMEL. This machine
has been manufactured using state-of-
the-art production techniques. All LÄGLER
productsaresubjectedto thoroughcontrols
before they leave the factory.
Please read right through these operat-
ing instructions before working with the
HUMMEL for the first time. The operating
instructions contain important information
relating to working safety and will answer
many of your questions, permitting you to
work confidently and safely with the ma-
chine.Ifyourequireinformationwhichisnot
provided in these instructions, refer to your
sanding manual or consult our Customer
ServicesDepartment,whichwillbepleased
toadviseyou. Ourfullytrainedand qualified
servicetechniciansarehighly familiarwith
theHUMMELand willbeabletoprovideany
assistance you may need.

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INTRODUCTION
1.4 DANGER WARNINGS
Read through the danger warnings carefully and instruct your
employees or colleagues accordingly. Failure to comply with this
requirement could result in danger of injury.
In order to avoid injury caused by the sanding belt, the machine
may never be switched on when tilted backward.
Use only tools, accessories and spares intended for the HUMMEL
supplied by LÄGLER. No warranty cover exists for parts sourced
from other manufacturers! Use of other parts can result in dam-
age to the machine, to the floor you are sanding, or injury to the
machine operator.
Ensure that the dust bag is correctly attached in order to prevent
theunnecessaryreleaseofdust.Thiscontaminatestheenvironment
and constitutes a health hazard to operating personnel.
Incorrect transportation will result in damage to the equipment.
To avoid fire or explosive damage, always remove the dust bag
from the machine following sanding and empty the contents into
a non-combustible container! Seal this container with a non-
combustible cover and always store both the container and the
dust bag in the open!
Keep well away from sources of fire.
Do not smoke when there is dust in the atmosphere (e.g. while
working with the machine or emptying out the dust) this could
cause a dust explosion.
The mains connection cable must be kept out of the work area in
order to prevent mechanical or electrical damage.
Inordertopreventanychanceofthemachinebeingunintentionally
started up, the power supply must be cut off when the machine is
switched off by unplugging from the mains!
To protect the equipment against current faults, we advise using a
DI safety plug (Art. no. in Section 10).
Whentheunitisoperatedcorrectly,theprescribeddustlimitvalues
areadheredto.Whenemptyingthedustbag,werecommendwear-
ing respiratory protection mask P3 (Art. no. in Section 10).
1

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Note:
The motor data mentioned above relates to ma-
chines used in the Federal Republic of Germany.
Different data may apply to exported machines.
This is indicated on the motor rating plate.
Note on noise emission:
The specified values are emission values and
are not required to constitute safe workplace
levels.Althoughacorrelationdoesexistbetween
emission and imission levels, it is not possible
to conclude on this basis whether additional
precautionary measures are necessary. Factors
which influence the current imission level ex-
isting at the workplace include the duration of
exposure, the character of the workroom, other
noise sources such as the number of machines
and other adjacent machining processes. The
admissibleworkplace valuescan alsovary from
onecountrytoanother. However, thisinformation
is provided in order to enable the user to better
estimate the level of danger and risk.
2
TECHNICAL DATA
Manufacturer.................................................... Eugen LÄGLER GmbH
Machine type....................................................Belt sanding machine
Serial number.............................................................see rating plate
Year of construction...................................................see rating plate
Motor type.......................................................single-phase AC motor
Voltage ..........................................................................................230 V
Frequency.....................................................................................50 Hz
Output..........................................................................................2.2 kW
Fusing..............................................................................................16 A
Insulation class...................................................................................B
Protection rating...........................................................................IP 54
Safety devices.......................................................no-voltage release
..................................................................thermal switch as overload
..........................................................................protection in the motor
Starting capacitor........................................................................60 µF
Operating capacitor.....................................................................40 µF
Drum diameter..........................................................175.5 mm (6 7/8“)
Drum width...................................................................200 mm (7 7/8”)
Drum speed.............................................................................2400 rpm
Dimension of the sanding belt................200 x 750 ( 7 7/8” x 29 1/2”)
Length.............................................................................1040 mm (41“)
Width................................................................................360 mm (14“)
Height.......................................................................1000 mm (39 3/8“)
Weight of the machining housing..................................41 kg (90 lbs)
Weight of the motor........................................................34 kg (75 lbs)
Weight of the guide tube....................................................4 kg (9 lbs)
Overall weight ...............................................................79 kg (174 lbs)
Dust emission at the workplace............ < 2 mg/m³ (0.024 gr./cu.yd.)
Workplace-related noise emission values...........................76 dB(A)
Technical data
1.5 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
2

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Neverusethesandingmachine for anytype
of wet operation!
When the machine is switched on, a se-
rious residual risk still remains despite
the presence of extensive safety devices.
Neverreachinto rotatingtoolsandmachine
parts!
TECHNICAL DATA
Intended applications
Sandingwoodenandcorkfloors,plasticskatingrings,withspecial
version also machining of sheet metal surfaces.
Basic equipment
Machinereadyforoperation,dustbag,MultiClipfordustbagfixture,
cablesupport, extensioncable 3x 2.5sq. mm- 10m long,O-ring as
a strain relief device, operating instructions and safety remarks,
toolkitcompletewithclosedmouthwrenchsize13/10,open-mouth
wrenchsize17,hexagonalsocketwrenchsize6and5,settinggauge,
box wrench and respiratory protection mask P3.
Optional equipment
Carrying handle, TransCart, pocket for ear plugs, DI safety plug,
safety belt.
Wearing parts
To ensure that the machine works safely and to maximum effect,
pleasecheckthestatusofthewearingpartslistedbelowatregular
intervals:
• Replace extension cable if damaged
• Replace motor cable if damaged
• Replace sealing felt if worn or damaged
• Replace MultiClip if damaged
• Replace V-belt if worn
• Replace sanding drum if worn or damaged (after daily use, ex-
change every 1 - 2 years)
• Replacethetensioningrollerifwornordamaged(afterdailyuse,
exchange every 1 - 2 years)
• Replace side cover if damaged
• Replace dust bag if worn or damaged
• Replace O-ring used as a strain relief if damaged
• Replace back wheel if worn or damaged
• Replace lateral wheels if worn or damaged
2
Therelevantarticlenumbers oftheoptional
accessoriesandwearing partsareprovided
in the spare parts lists in Section 10.

8
COMMISSIONING
Commissioning
This section describes the procedure for commissioning the
HUMMELon site.In orderto excludethe possibilityof damageand
malfunctions, it is essential to proceed in the sequence outlined
below.
Before working with the machine for the first time, operating staff
must be adequately instructed!
3.1 PREPARING THE MACHINE FOR OPERATION
1Unpack the machine carefully. The bottom part of the sup-
plied transport crate makes a useful container for storage or
transportation of the machine (see Section 5, Transport and
storage). Please ensure that the packaging materials are
responsibly disposed of.
2Press the lowering lever downwards, insert the guide tube
into the opening in the housing and at the same time place
the top part of the lowering rod linkage into the bottom part
of the rod linkage in the machine housing (Fig. 2).
3Tighten the wing screw and the wing nut (Figs. 3 and 4).
4Liftthesandingdrumoffthefloorbyturningtheloweringlever
upwards.
5Mount the cable support onto the provided bracket at the top
of the guide tube (Fig. 5)
6Fasten the dust bag firmly using the cord and the MultiClip at
the end of the guide tube, ensuring when mounting that the
opening of the guide tube is not closed (Fig. 6).
7Releasethecoverlockandremovethesidecoverontheright
of the machine housing (Fig. 7).
8To engage the sanding belt, pull the opposite lever upwards.
This will lower the tensioning roller (Fig. 7).
Fig. 2 Wheninsertingtheguidetube,makesurethatthe
rod linkage of the lowering mechanism feeds in
correctly!
Fig. 3 After inserting the guide tube, carefully tighten
the wing screw and …
Fig. 4 … the wing nuts.
Fig. 5 Suspend the cable support into the provided
hole.
3

9
PREPARING THE MACHINE
9Position the sanding belt on the tensioning roller and push it
over the sanding drum (Fig. 8).
10 Position the sanding belt so that it evenly covers the sanding
drum (Fig. 9).
11 To tension the sanding belt, press the tensioning lever down-
wards (Fig. 10).
12 Connect the motor cable plug to the extension cable.
13 Plugintheextensioncabletoaadequatelyfused 230 V mains
socket with PE contacts.
14 Before closing the housing opening by replacing the side
cover, check the precise tracking of the sanding belt. While
doingso,thesandingdrum mustberaisedoffthefloor!Switch
onthemachineforaround2secondswiththeswitchposition
-TEST- and check the sanding belt tracking.
Should the belt require readjustment, please check Section
6.3, Checking sanding belt regulation.
15 Close the housing opening with the side cover.
The machine is now ready for operation.
Before working with the machine for the first time, operating staff
must be adequately instructed!
Fig. 6 Mount the dust bag without creasing using the
cord and MultiClip.
Fig. 7 Release the cover lock, remove the side cover
and lower the tensioning roller by pulling up the
lever.
Fig. 8 Mount the sanding belt.
Fig. 9 Pushthesandingbeltfarenoughoverthesanding
drum and tensioning roller so that the sanding
drum is fully covered by the belt.
ATTENTION!
Never switch on the motor before tensioning the sanding belt!
Never switch on the motor unless the sanding drum is raised
off the floor!
ATTENTION!
Never reach into the area of the 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. This could result
in serious injury or damage to the machine!
3

10
STARTING THE MACHINE
Fig. 10 Tension thesandingbeltbyloweringthe tension-
ing lever.
3.2 STARTING THE MACHINE
Oncethepreparatorystageshavebeencompleted,themachinecan
be started. To start the motor, the switch must be held for around
2 seconds in the -START- position until the motor has reached full
speed.
Remaining for too long in the -START- switch position shortens the
service life of the starting capacitor! Once the motor has reached
its full speed, release the switch button. The switch will then auto-
matically move to the -WORKING- position.
If the motor should ever be difficult to start in extremely cold con-
ditions, the V-belt tension should be relaxed by loosening the eye
bolt.Lowerbelttensionwillallowthe motor to startupmoreeasily.
Once the motor is up to temperature, remember to retension the
belts using the eye bolt.
3.3 SWITCHING OFF THE MACHINE
To switch off, raise the sanding drum off the floor by actuating the
lowering lever and turn the switch button to the -0- position. Wait
until the sanding drum comes to a standstill before replacing the
machine down onto the sanding drum. Never allow the machine to
run unattended and always pull the mains plug out of the socket
once you have finished working.
3
ATTENTION!
Never switch on the motor before tensioning the sanding belt!
Never switch on the motor unless the sanding drum is raised
off the floor!
Neverallowthemachine torununattended,and alwayspullthe
mains plug out of the socket once you have finished working!

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WORKING WITH THE HUMMEL
Working with the HUMMEL
4.1 APPLICATION TIPS
Itispossibletoavoidleavingdeepsandingtrackscausedbyexces-
sively coarse grit size by initially selecting a fine grit size for the
first sanding process.
Carryoutatestsandingprocessusinga50or60gritsize(afewtest
strokes).Ifthistestissatisfactoryandyouenvisageagoodsanding
result within a reasonable period, it is more efficient to start the
sanding work off with these finer grit sizes.
Youcanavoidcreatingdeepsandingtrackswiththementionedgrit
sizes by adhering to the grit size sequence and not skipping more
than one grit size at a time.
Aftereachsandingpass,vacuumthefloorthoroughly,andcleanthe
machine’s wheels before starting each new sanding operation.
In order to avoid chatter marks, use sanding belts with bud joints
and tape.
When changing to a new sanding belt, always start work in a less
well lit area of the room until the sanding belt loses its initial ag-
gressive sanding behaviour.
Alwayssandfromlefttoright.Thisensuresthattheleft-handlateral
wheelalwaysrunsover the newlysandedsurface,making the sur-
face more even with each sanding pass and preventing waviness.
One sanding pass comprises a forward and reverse movement
over the same track without offset. Avoid a sanding track offset of
more than 85%.
For other informative and important application tips, please refer
to the LÄGLER application technology brochure „Sanding wooden
floors“!
4
For more information free of charge, please
apply to within Germany:
- Tel.: 0800 / 52 34 537
- Fax: 0800 / 48 66 353
within the USA:
- Tel.: [phone]
or
- Tel.: +49 - 7135 - 98 90-0
- Fax: +49 - 7135 - 98 90-98
- e-mail: info@ laegler.com
- Internet: http://www.laegler.com

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CHANGING THE SANDING BELT
4.2 CHANGING THE SANDING BELT
Depending on the type of sanding process you wish to perform,
different abrasive grit sizes can be selected. In order to change
the abrasive, proceed as follows:
1Switch off the machine.
2Pull the mains plug out of the socket before performing any
work at the machine!
3Remove the side cover (Fig. 11).
4Toreleasethetensiononthesandingbelt,pulluptheopposite
lever. This will lower the sanding drum (Fig. 11).
5Exchange the sanding belt while the sanding drum is raised
off the floor (Figs. 12 and 13).
6To tension the sanding belt, press the tensioning lever down-
wards (Fig. 14).
7Plug the mains plug into an adequately fused socket with PE
contacts.
8Beforeclosingthe housing opening,checkthe precisetrack-
ing of the sanding belt. To do this, switch on the machine for
around2secondsinthe-TEST-switchpositionandcheckthe
tracking of the sanding belt.
Should readjustment be required, please read Section 6.3,
Checking sanding belt regulation.
9Close the housing opening again using the side cover (Fig.
15).
It is now possible to execute the next sanding process with the
machine.
Fig. 11 Beforeexchanging,thesandingbelttensionmust
bereleased.Todothis,releasethesidecoverand
pull up the lever.
Fig. 12 Remove the worn sanding belt from the roller.
Fig. 13 Position the new sanding belt.
Fig. 14 Never forget to retension the sanding belt.
Otherwise, damage or injury can occur!
4
ATTENTION!
Never switch on the motor before the sanding belt has been
tensioned! Never switch on the motor unless the sanding drum
is raised off the floor! Otherwise, injury or damage can occur!

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REGULATING THE SANDING DRUM PRESSURE
4.3 REGULATING THE SANDING DRUM PRESSURE
The lever can be used to set three different drum pressure stages.
Thesethreestages-COARSE/MEDIUM/FINE-are designated on
the notch plate as -GROB / MITT. / FEIN- (Fig. 16).
The pressure stage indications relate to the grit size sequence.
The sanding pressure should be adjusted inline with the grit size
sequence and reduced as the fineness of the grit size increases.
This setting facility permits you to adjust the drum pressure to the
prevailing circumstances.
Forexamplewhensandingwithgritsize50inthe-GROB(COARSE)-
setting, the same stock removal is achieved as when sanding with
grit size 40 in the -MITT. (MEDIUM)- setting.
In order to avoid dish-outs when sanding soft wood floors, the
sanding pressure should be reduced and the sanding speed in-
creased.
4.4 EMPTYING THE DUST BAG
Thedustbagmustbeemptiedwhenonethird full at the latest.Oth-
erwise, suction performance will deteriorate as the filter surface
becomes clogged.
When emptying the dust bag, a respiratory protection mask P3
must be used.
Fig. 15 Aftercompletedsandingbeltchangeover,replace
the side cover.
Fig. 16 Different sanding pressures stages can be se-
lected using the setting lever.
4
ATTENTION!
To avoid fire or explosive damage, always remove the dust bag
from the machine following sanding and empty the contents
into a non-combustible container! Seal this container with a
non-combustiblecoverandalways storeboththecontainer and
the dust bag in the open!

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TRANSPORT AND STORAGE
5.1 DISMANTLING THE MACHINE
For transportation, the machine can be dismantled into three
parts: Guide tube, motor and machine housing. All parts must be
adequatelysecuredagainstslippingwhilebeingtransportedinthe
deliveryvanetc.Duringmanualtransportoverroadsandpavements,
toprotectthe wheels andsandingdrum, usetheTransCart (forArt.
no. see Section 10, Spare parts).
1Switch off the machine and pull the extension cable out of
the socket!
2Openthewingscrewandwingnutandpulltheguidetubeout
of the machine housing (Fig. 17).
3ToremovetheV-belt,openthebeltguard(Fig.18)andrelease
the tension on the V-belt by releasing the eye bolt (Fig. 19).
4Remove the suction belt by allowing it to run off the lower
pulley by turning the motor pulley (Fig. 20). Take care of your
fingers danger of crushing!
5Apply the box wrench (tool kit) to the lower pulley and turn
the roller in the clockwise direction while allowing the drive
belt to run off the pulley. Never turn anti-clockwise, as this
could cause the screw joint to loosen (Fig. 21)! Take care of
your fingers danger of crushing!
6Release the motor nuts. The motor nut must only be backed
out from the fitting between the motor nut and motor bearing
bracket, and not completely removed (Fig. 22 and 23).
7Liftthemotoroutofthemachineandsecureitduringtransport
against slipping and damage (Fig. 24).
Transport and storage
Fig. 17 After opening the wing screws and wing nuts
which fasten the rod linkage, the guide tube can
be drawn out of the machine housing.
Fig. 18 Open the belt guard.
Fig. 19 Release the V-belt tension by loosening the eye
bolt.
5

15
5.2 ASSEMBLY AFTER TRANSPORTATION
When assembling the HUMMEL after transport, adhere to the fol-
lowing sequence of work steps:
1Place the motor in the motor bearing bracket and tighten the
motor nuts.
2Mount the V-belts and tension using the eye bolt.
3Close the belt guard.
4Press the lowering lever downwards, now insert the guide
tube in the housing opening and at the same time insert the
lowering rod into the bottom part of the rod linkage in the
machine housing (Fig. 2).
5Tighten the wing screws and wing nuts (Figs. 3 and 4).
6Plug the extension cable plug into an adequately fused 230 V
mains socket with PE contacts.
The machine is now ready for use.
5.3 STORAGE
If you wish to keep the machine in storage for a protracted period,
ensurethat itis keptdry andfree ofthe influenceof frostin a loca-
tion without excessive temperature fluctuations.
ASSEMBLY AFTER TRANSPORTATION
Fig. 20 Remove the suction V-belt.
Fig. 21 Allow the drive belt to run off the lower pulley. If
necessary, use the box wrench to help you, but
turn exclusively in the clockwise direction in
order not to release the screw joints.
Fig. 22 Loosen the two motor nuts …
Fig. 23 … until the two nuts used to fit into the motor
bearing bracket are exposed.
5
Professional tip
During transportation, place a flat piece of wood between the floor
surface and machine housing. This prevents the housing from slipping
and stops the drum being in direct contact with the floor.
During transport, the machine can also be firmly lashed to the bottom
part of the supplied transport crate using two belts (Fig. 25). This will
prevent damage to the sanding drum and stop the wheels becoming
out of round!
Professional tip
When storing for long periods, place the machine on the bottom part
of the supplied transport crate (Fig. 25) or place a support underneath
the machine housing. This will prevent damage to the sanding drum
and stop the wheels becoming out of round!

16
MAINTENANCE
Periodically but at the latest when you notice that damage has oc-
curred,avarietyofmaintenanceprocedureshavetobeperformed.
For this work, use exclusively original spare parts from LÄGLER.
Work in a clean, well lit location and proceed in accordance with
theseinstructions. In thetool kit, you will find all the toolsrequired
to carry out the work described below.
It takes only a minimal amount of time to inspect the machine,
but this precautionary measure can save subsequent complaints
broughtaboutbyminordamagetothemachine.Performingregular
maintenance work will help to retain the value of the machine and
is also in the interests of your own safety.
6.1 CLEANING AND CARE INSTRUCTIONS
Never use cleaning agents containing solvents!
Before starting work, you should perform the following care pro-
cedure in order to ensure that the machine is in full working order
and produces the customary high-quality sanding finish:
• Checkthetensioningrollerandthesandingdrumfordamage.
Clean the parts carefully and ensure that the rubber coating
on the rollers is not damaged.
• Checkbelttrackingandsetitifnecessaryusingagritsize120
sanding belt (Section 6.3, Checking sanding belt regulation).
• Clean the wheels of the machine.
• Check the belt tension / correct it with the aid of the eye
bolt.
• Check that the lowering rod linkage is easy running.
• Carry out a visual inspection of the electrical equipment (ex-
tension cable, plug, couplings).
Maintenance
Fig. 24 Lift the motor out of the housing.
Fig. 25 Transportorstorethemachineonthebottompart
of the transport crate.
6
ATTENTION!
Useexclusivelyoriginal partsfromLÄGLER!
Onlybydoingsocantheperformanceofyour
machine be guaranteed. Warranty claims
arising due to the use of externally sourced
parts will not be acknowledged!

17
CLEANING AND CARE INSTRUCTIONS
6.1.1 THE DRIVE UNIT
Thedriveunitshouldberemovedandcleanedatleastonceaweek
if the machine is used every day. The drive unit is removed using
the following procedure:
1Switch the machine off and pull the mains plug out of the
socket!
2Ensure that the sanding drum is raised off the floor.
3Releasethecoverlockandremovethesidecoverontheright
of the machine housing (Fig. 26).
4Pull the opposite operating lever for the drive unit upwards.
This lowers the tensioning roller (Fig. 26).
5Remove the abrasive belt (Fig. 27).
6If you wish to remove the tensioning roller of the drive unit
(Section 6.6.2, Exchanging the tensioning roller), press the
operating lever for the drive unit downwards (Fig. 14).
7Remove the operating lever by unscrewing (Fig. 28).
8Releaseandremovethethreehexagonalsocketheadscrews
(Fig. 29).
9Carefully remove the unit and clean it (Fig. 30).
Reassemble in reverse order. After mounting the drive unit, check
the belt tracking and set if required (Section 6.3, Checking sanding
belt regulation).
Regular exchange of the sanding drum and tensioning roller guar-
antees a constant degree of operating quality and performance.
Whenworkingeverydaywiththemachine,theymustbeexchanged
every 1 - 2 years, otherwise every 3 – 4 years (see Section 6.6.1
and 6.6.2).
Fig. 26 Releasethecoverlock,removethesidecoverand
lower the tensioning roller by raising the lever.
Fig. 28 Unscrew the lever.
Fig. 29 Release and remove the three hexagonal socket
head screws.
Fig. 27 Remove the sanding belt off the rollers.
6

18
LUBRICATION
6.2 LUBRICATION
Forgeneralupkeepofthemachine,afteraround100operatinghours
we recommend sparing lubrication of the two lubrication nipples
at the wheel bearings using a manual grease gun (tool kit) using
ball bearing grease.
In order to guarantee lasting easy running of the moving parts,
lubricate at regular intervals at the following lubrication points
(Fig. 31).
ATop part of the rod linkage at the lever plate
BLever plate on the handle shaft
To do this, tilt the machine slightly to one side and allow a small
amount of oil to run into the lubrication points.
CWing screw on the bottom part of the rod linkage
DGuide tube in the machine housing
EWing nut at the housing
Use customary lubricating oil for these lubrication points - never
use grease or sprays such as WD 40 or similar!
6.3 CHECKING SANDING BELT REGULATION
The sanding belt tracking must be checked every time the sanding
belt is exchanged, but at least once a day.
Should readjustment be necessary, proceed as follows:
1Switch the machine off and pull the mains plug out of the
socket!
2Remove the side cover (Fig. 32).
3Check whether any soiling at the tensioning roller calls for
readjustment. If so, the tensioning roller must be cleaned
(Section 6.1.1) and the belt tracking must be checked again
(Section 4.2.8).
Fig. 32 Release the cover lock and remove the side
cover.
Fig. 31 Lubrication points which should be regularly
oiled.
Fig. 30 Carefully remove the drive unit.
6
IMPORTANT
In newer models, this lubrication point has been replaced by a self-
lubricatingplastic bushing.This bushingdoes notrequire lubrication!
Never use sprays such as WD 40 or similar!

19
CHECKING THE MACHINE SETTING
4Alwayssetthebelttrackingusingasandingbeltwithasfinea
gritsize as possible(= flexible belt).This isbecausethe more
flexible the sanding belt, the precisely it is possible to set the
tensioning roller.
Mount the sanding belt and carry out a test run (Section
4.2.8).
If the belt is running out of true, it must be turned around and
another test performed.
Ifthebeltrunsinthesamedirectionbothtimes,thetensioning
roller requires readjustment. If the belt runs to the front and
after turning over runs to the back or vice versa, the belt is of
poorquality and shouldbe returned tothe manufacturer with
a complaint (conical sleeve).
5However, if readjustment is necessary, release the lock nut
at the drive unit and adjust the hexagonal socket head screw
(Fig. 33).
ARotation to the right = belt runs to the front
BRotation to the left = belt runs to the back
6If the belt tracking is seen to be correct after adjusting once,
tighten the lock again. If not, repeat the process.
7Replace the side cover.
6.4 CHECKING THE MACHINE SETTING
From time to time, or as a result of incorrect transportation, it is
possibleforthemachinetobecomeincorrectlyadjusted.Incorrect
adjustment is indicated by one-sided sanding of the sanding drum,
which can lead to sanding tracks and complaints. Correction of
machine settings is performed as follows:
1Switch off the machine and pull the mains plug out of the
socket!
2Tiltthemachinebackwardsoverthesafetyguardssothatyou
canseethewheelbearings(Fig.34).Ensurethat the machine
is standing securely!
3The wheel on the belt guard side can be adjusted by releas-
ing the tension screw. The other wheel is firmly fixed using a
screw.
Fig. 33 Adjustthebelttrackingatthesettingscrewofthe
drive unit (see description on the left).
Fig. 34 To check the machine setting, tilt the machine
backwards. Ensure that the machine is standing
securely!
6

20
CHECKING THE MACHINE SETTING
4For setting, first take the actual position of the adjustable
wheelusingthesettingfixture.Positionthefixtureagainstthe
machine housing in such a way that it rests not only against
the machine housing on both sides, but also at the adjust-
able wheel. If necessary, turn the threaded pin of the setting
device. To do this, release the two nuts of the setting fixture
(Fig. 35).
5Ifthemachineis sandingmore heavilyon thebelt guardside,
the wheel must be adjusted away from the housing (Fig. 36).
Ifthemachineissandingmoreheavilyon thesidecoverside,
the wheel must be adjusted towards the housing (Fig. 36).
Now adjust the threaded pin of the setting device in the rel-
evant direction by the required amount.
6Releasetheclampingscrewatthewheelclampoftheadjust-
able wheel and place the setting fixture against the machine
housing again (Fig. 37).
7Setthe wheel inthe required positionby meansof the setting
devicesothatthewheelliningjuststillmakescontactwiththe
threaded pin when turning, and tighten the clamping screw
again.
8Carry out a sanding test to check whether the machine is
now correctly adjusted. If not, the process will have to be
repeated.
The best working result is achieved when the machine sands cen-
trally;onlywiththissettingisitpossibletoavoidthebeltfromsand-
ing too deep on one side, resulting in unwanted sanding tracks.
Fig. 36 If the drum is no longer sanding on side A, the
wheel must be adjusted in the direction of B.
Fig. 37 Release the screw on the right-hand wheel
clamp.
Fig. 38 The sealing felt must not demonstrate any signs
of damage, otherwise replace.
Fig. 35 Removethecurrent settingfixturefromtheright-
hand wheel (seen from below).
6