S3 Nilfisk S Series Industrial Vacuum Service Manual
User Manual: S3
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Page Count: 73
Nilsk-CFM S.p.A. Via Porrettana 1991 - 41059 Zocca (Modena) Italy - Tel. +39 059 9730000 - Fax +39 059 9730099 - www.nilsk-cfm.com - info@nilsk-cfm.com
S2 - S3 service manual
S2 - S3 service manual 2
Table of contents
Preface ..........................................................................................................................................................................................page 3
Symbols ........................................................................................................................................................................................page 4
A Safety instructions ...............................................................................................................................................................page 5
A.1 - Operator safety ............................................................................................................page 6
B Technical data .........................................................................................................................................................................page 9
B.1 - Technical data ............................................................................................................ page 10
C Components ........................................................................................................................................................................ page 11
C.1 - Trolley .......................................................................................................................... page 12
C.2 - Handle complete with cable carrier ..................................................................... page 12
C.3 - Filtering chamber with complete inlet and deector ...................................... page 13
C.4 - Complete container ................................................................................................. page 14
C.5 - Accessories rack ........................................................................................................ page 15
C.6 - Filter ring and seal ................................................................................................... page 16
C.7 - Filter with lter catch clamp ................................................................................. page 16
C.8 - Filter shaker cage ..................................................................................................... page 16
C.9 - Complete motor head ............................................................................page 17
C.10 - Motor head closing band .....................................................................page 17
C.11 - Control panel .......................................................................................page 18
C.12 - Filter shaker system ..............................................................................page 18
D Vacuum cleaner operation ............................................................................................................................................ page 19
D.1 - Controls and indicators ........................................................................................... page 20
E Troubleshooting ................................................................................................................................................................. page 23
E.1 - Electrostatic discharge.............................................................................................. page 24
E.2 - Trolley ........................................................................................................................... page 25
E.3 - Filtering chamber with complete inlet and deector ....................................... page 33
E.4 - Container .................................................................................................................... page 35
E.5 - Filter .............................................................................................................................. page 38
E.6 - Complete motor head ............................................................................................. page 41
F Spare parts ............................................................................................................................................................................ page 68
F.1 - Spare parts ................................................................................................................... page 69
G Instruments ......................................................................................................................................................................... page 70
G.1 - Special instruments .................................................................................................. page 71
H Wiring .................................................................................................................................................................................... page 72
H.1 - Wiring diagram ......................................................................................page 73
S2 - S3 service manual 3
Preface
This manual provides essential information required for repairing S2 - S3 series wet and dry vacuum cleaners.
When doing repairs, make sure you have a suitable workbench and the required electrical connection.
If particular anomalies are noticed during maintenance, please inform the customer who should have the user manual.
Appliance faults can be caused by several different factors. In this case refer to chapter E Troubleshooting.
For repairs, please refer to the list of spare parts indicating the positions of each component and the relevant sequence of as-
sembly.
Read the Technical Service Bulletins carefully with the technical modications performed after the manual was published.
The Technical Service Bulletins represent a supplement of the spare parts list until the next is published.
The manuals and bulletins must always be available during repairs. Other technical documents on the S2-S3 series may be re-
quired for repairs.
These documents should not be transferred to third parties.
ONLY USE ORIGINAL NILFISK-CFM SPARES!
S2 - S3 service manual 4
Symbols
Symbols used for instructions
The safety instructions indicated by this symbol in the manual must be observed to avoid injury
to persons.
This symbol is used to indicate the safety instructions which must be observed to prevent
damaging the vacuum cleaner and malfunctions.
This symbol indicates suggestions and instructions to simplify jobs and guarantee safe working
conditions.
A
Safety instructions
S2 - S3 service manual 6
A.1 - Operator safety
The repairs must only be carried out by personnel suitably trained for the job to do, or
a qualied electrician.
Before starting the vacuum cleaner, read these operating instructions carefully and keep them on hand for consultation.
The vacuum cleaner should only be used/serviced by people who are familiar with the way it works and who have been explic-
itly authorised and trained for the purpose.
Before using/servicing the vacuum cleaner, the operators must be informed, instructed and trained on how to use it and with
which substances it can be used, including the safe method for removing and disposing of the vacuumed material.
Use the vacuum cleaner in accordance with the laws in force in the country where it is used.
Besides the operating instructions and the laws in force in the country where the vacuum cleaner is used, the technical regula-
tions for ensuring safe and correct operation must also be observed (Legislation concerning environmental protection and
safety at work, i.e. European Union Directive 89/391/EC and following).
Do not perform any operation that could jeopardize the safety of people, property and the environment.
Comply with the safety indications and prescriptions in this service manual.
Observe the provisions of the directives and national safety regulations on the sale of electrical appliances, in particular
EN60335-2-69- En.AA
Vacuum cleaners for dust harmful to health are classied according to the following dust classication:
L (low risk) suitable for separating dust with an exposure limit value of at least 1 mg/m1. 3, depending on the volume occu-
pied; retains at least 99% of the vacuumed particles (See EN60335-2-69, Enclosure A.A);
M (medium risk) suitable for separating dust with an exposure limit value of at least 0.1 mg/m2. 3, depending on the volume
occupied; retains at least 99.9% of the vacuumed particles (See EN60335-2-69, Enclosure A.A);
H (high risk) for separating all dust with an exposure limit value lower than 0.1 mg/m3. 3, depending on the occupied vol-
ume, including carcinogenic and pathogenic dusts such as asbestos. Class H14 Hepa lter in accordance with standard EN
1822; retains at least 99.995% of vacuumed particles (See EN60335-2-69, Enclosure A.A).
S2 - S3 service manual 7
A.1 - Operator safety
Class L-M vacuum cleaners are identied by labels with pictograms of the following meaning.
.
This vacuum cleaner contains dust hazardous for the health.
Only authorised personnel wearing suitable personal protective
equipment should empty and service the vacuum cleaner, including
removing the means used to vacuum the dust. Do not use without
the complete lter system in place.
Class H vacuum cleaners are identied by a label with the following text.
S2 - S3 service manual 8
A.1 - Operator safety
Check the place of work and substances tolerated for the vacuum cleaner suitable for liquids.
WARNING - DANGER !
In the case of electrical vacuum cleaners/instruments connected to the vacuum cleaner,
always refer to the user manual and safety instructions.
WARNING - DANGER !
Take care not to raise dust during maintenance operations. Wear a P3 protective mask.
B
Technical specications
S2 - S3 service manual 10
B.1 - Technical data
PARAMETER UNIT OF MEASURE S2
L,M,H
S3
L,M,H
Voltage / frequency V/Hz 230/50-
60
230/50-
60
Power rating kW 2 3
Power rating (EN 60335-2-69) kW 1.8 2.6
Max. weight kg 67 73
Noise level (EN 60335-2-69) dB(A) 70 71
Protection IP 44 44
Insulation Class I I
Capacity L40 50 - 100
Dust bag capacity (versions M - H) L 32 32
Inlet mm Ø 70 Ø 70
Max vacuum hPa 211 211
Maximum air ow without hose and reductions L/min’ 5500 8070
Maximum air ow (3 m Ø 50 mm hose) L/min’ 4720 6500
Hoses allowed for “L” and “standard” classes mm Ø 70 Ø 70
Hoses allowed for “M” and “H” classes mm Ø 50 Ø 50
Primary lter surface (L-M) m21.95 1.95
Upstream absolute lter surface m23.5 3.5
Absolute lter efciency according to MPPS method (EN 1822) % 99.995
(H14)
99.995
(H14)
Note:
• Storage conditions: T :
-10 +40 °C - Humidity: ≤ 85%
• Operating conditions: Maximum altitude 800 m (up to 2,000 m with reduced performances)
T : -10 +40 °C - Humidity: ≤ 85%
C
Components
S2 - S3 service manual 12
C.1 - Trolley
Trolley
Upright
Accessory support
C.2 - Handle complete with cable carrier
S2 - S3 service manual 13
C.3 - Filtering chamber with complete inlet and deector
Filtering chamber
Complete inlet
Deector
S2 - S3 service manual 14
C.4 - Complete container
100 L container
50 L container
40 L container
S2 - S3 service manual 15
C.5 - Accessories rack
C.6 - Filter ring and seal
Filter ring
Filter ring seal
S2 - S3 service manual 16
C.7 - Filter with lter catch clamp
Filter
Filter catch clamp
C.8 - Filter shaker cage
S2 - S3 service manual 17
C.9 - Complete motor head with cable and plug
Motor head
Cable and plug
C.10 - Motor head closing band
S2 - S3 service manual 18
C.11 - Control panel
C.12 - Filter shaker system
D
Vacuum cleaner operation
S2 - S3 service manual 20
D.1 - Controls and indicators
Start/stop switch
2-way selector
Position 0 - The vacuum cleaner is turned OFF
Position 1 - The vacuum cleaner is powered and
starts
Main motor Start/Stop indicator and button If the indicator is lit, the main motor is ON. You can
start/stop the main motor with this button.
Second motor Start/Stop indicator and button If the indicator is lit, the second motor is ON. You
can start/stop the second motor with this button.
Third motor Start/Stop indicator and button If the indicator is lit, the third motor is ON. You can
start/stop the third motor with this button.
Stop button
When this button is pressed all the motors
stop simultaneously. The motors and internal
components of the vacuum cleaner will still be
electrically powered.
S2 - S3 service manual 21
D.1 - Controls and indicators
Low compressor pressure alarm
indicator (red)
If lit, this stops vacuuming and indicates an anomaly in the
pressure of the compressor (if installed). Check the compressor
is working.
Max. vacuumed material level indicator
(red)
If lit, this stops vacuuming and indicates the maximum level
of the vacuumed material has been reached in the container,
if the level control for liquids or solids is installed. Empty the
container.
Power indicator Indicates whether the vacuum cleaner is powered.
Primary lter indicator (green/red)
Green - Indicates the primary lter is functioning properly.
Red - Indicates the primary lter is blocked. This means the air
speed in the suction tube is less than 20 m/s.
Stop the vacuum cleaner and clean the lter.
Absolute lter indicator (if installed-red) Indicates the primary lter is blocked. Stop the vacuum cleaner
and change the lter.
Manual lter shaker knob Lets you clean the primary lter using manual mechanical
action.
Shaking the primary lter
Depending on the
quantity of dust
vacuumed, if the
indicator turns red, turn
the vacuum cleaner off
and shake the primary
lter using the knob on
the side of the motor
head.
Stop the vacuum cleaner before shaking the lter. Do not shake the lter with the
vacuum cleaner functioning, as this could damage the lter.
Wait to let the dust to settle before restarting the vacuum cleaner. If the indicator is still red even
after the lter has been shaken, change the lter.
S2 - S3 service manual 22
D.1 - Controls and indicators
Emptying the container
We recommend cleaning the lter before emptying the container.•
Release the container with the lever, then remove it and empty it. Replace the container after having checked the •
condition of the seal.
Stop the vacuum cleaner before performing this operation.
Let the dust settle before removing the container.
E
Troubleshooting
S2 - S3 service manual 24
E.1 - Electrostatic discharge
Take the following precautions to discharge
electrostatic charges before doing any repairs on the
electrical circuits:
Touch the protective conductor to discharge any static •
electricity charge in your body;
If possible, wear an antistatic bracelet;•
Use antistatic mats;•
Never touch a circuit board or electronic components, •
always hold them with plastic or insulated tools;
Transport electronic components in conductive •
packaging (special packs to discharge electrostatic
charges for example).
Before proceeding with these operations, turn off
the vacuum cleaner and remove the plug from the
power socket.
S2 - S3 service manual 25
E.2 - Trolley
Unscrew the 4 screws xing the upright side panel by hand
or with a screwer.
The screws in the front are a different length.
The longer screws must be used near the reinforcing
spacer in the side-panel.
Do not swap screws
S2 - S3 service manual 26
E.2 - Trolley
Remove the side-panel. View of the upright.
Use a hex-head wrench to loosen the top screw holding
the side bracket.
Loosen the bottom screw too.
S2 - S3 service manual 27
E.2 - Trolley
The 2 side brackets have 4 hexagonal press-t inserts.
Remove the 4 screws holding the 2 side brackets, turn the
lter chamber and pull it out of the 2 trolley uprights.
Take care when removing
the 4 screws. Hold the lter
chamber rmly
Proceed by unscrewing the handle with the cable carrier.
Use a hex-head wrench to tighten the 2 screws on each
side of the handle.
S2 - S3 service manual 28
E.2 - Trolley
Use a hex-head wrench.
Take care when removing
the 4 screws. Always hold
the handle rmly.
To remove and change the cable carrier, unscrew the 6
screws holding it on the handle.
Make sure the cable carrier is facing upwards.
S2 - S3 service manual 29
E.2 - Trolley
To remove and replace the plastic retainer of the
accessories support, unscrew the screw in the centre.
To remove and change the accessories support, unscrew
the 2 screws holding it on the upright with a hex-head
wrench.
Fit the accessories supports facing the right way.
This is important also in
order to connect the grip
properly.
S2 - S3 service manual 30
E.2 - Trolley
To remove and replace the container coupling bracket,
unscrew the bolts with a hex-head wrench.
Make sure you replace
the brackets in the right
position.
To remove and replace the whole upright, unscrew the 2
bolts holding it on the trolley.
To remove and replace the xed wheels, unscrew the
nylock nuts with a wench.
Make sure the bolts are
tight after changing the
wheels. The wheel should
turn freely.
S2 - S3 service manual 31
E.2 - Trolley
To remove and replace the accessories rack, unscrew the
bolts under the front of the trolley.
Use a suitable hex-head wrench.
Remove the protective plug to remove the castors.
S2 - S3 service manual 32
E.2 - Trolley
Use a suitable hex-head wrench.
Make sure the bolts are
tight after changing the
wheels.
Block the trolley in place with the brakes to make changing
the wheels easier.
The brake should only be
activated and deactivated
with the feet. Never use
your hands.
S2 - S3 service manual 33
E.3 - Filtering chamber with complete inlet and deector
The roundhead screws must have a washer and be
tightened down correctly to prevent air leaks (vacuum
loss).
Use roundhead screws to
prevent sharp parts tearing or
damaging the lter fabric.
The deector must be turned to the correct position
(towards the container below).
Do not t the deector facing
upwards.
Make sure the tongue that guarantees earth continuity
between the motor head the ltering chamber is always
tted.
S2 - S3 service manual 34
E.3 - Filtering chamber with complete inlet and deector
The seal must be tted correctly in the side groove and
bonded in place with suitable glue (such as Bostik). Also
make sure the joint of the 2 parts is bonded properly.
If it isn’t xed correctly, this
could lead to air leaks (vacuum
loss).
Do not t the seal under too
much tension in relation to its
length of 1.5 m.
If the seal leaks:
Loosen the four screws holding the brackets on the uprights of the frame;•
Lower the ltering chamber and tighten the screws again with the half released (container lever in the middle of its •
travel) container pressed down on the seal;
The gasket must be replaced if it is torn, cut, etc.•
Replace the seal if the degree of tightness is still not optimal.•
The complete inlet must be installed correctly (with the
seal between the inlet and the ltering chamber and the
screws tightened properly).
If the screws aren’t tightened
properly, this could cause air
leaks (vacuum loss).
S2 - S3 service manual 35
E.4 - Container
To remove and replace the container wheels, remove the
plastic wheel guard using a suitable wrench.
The plastic support ts on the wheel bracket with 2 studs
on the side.
Unscrew the bolt in the wheel bracket using a hex-head
wrench.
To remove the release lever, use an Allen wrench to
unscrew the hex-head screws in the bush welded on the
container.
S2 - S3 service manual 36
E.4 - Container
Unscrew the screws, then remove the normal washers and
serrated washer.
Remove the whole lever, opening it out so it comes off the
2 welded pins.
To remove and replace the roller pin, use a screwdriver and
a hex-head wrench.
Make sure the roller pin
slides freely.
S2 - S3 service manual 37
E.4 - Container
When inserting in the container, check the roller pin is
inserted properly and slides freely on the coupling guide
mounted on the uprights.
Check the container couples correctly and presses against
the seal properly.
Keep your hands in the
right place when coupling
the container.
S2 - S3 service manual 38
E.5 - Filter
When the vacuum cleaner is used to vacuum hazardous
substances, the lters become contaminated, therefore:
Work with care and avoid spilling the vacuumed dust •
and/or material;_
Place the disassembled and/or replaced lter in a •
sealed plastic bag;
Close the bag hermetically;•
Dispose of the lter in accordance with the laws in •
force;
Filter replacement is a serious matter. The lter must •
be replaced with one that has the same characteristics
(surface area and class); otherwise the vacuum cleaner
may malfunction and operate in unsafe conditions;
Check the vacuum cleaner class (L-M-H). Take care not •
to raise dust when this operation is carried out. Wear a
P3 mask and other protective clothing plus protective
gloves (PPE) suitable for the hazardous nature of the
dust collected. Refer to the laws in force.
The lter must be changed if it is blocked, torn or cannot
guarantee high ltering efciency. If shaking the lter isn’t
enough, it must be replaced.
S2 - S3 service manual 39
E.5 - Filter
When the complete lter kit has been removed from the
motor head, unscrew the clamp and remove the lter ring.
Turn the lter upside down. Cut the plastic ties and detach
the cage from the lter.
Fit the lter catch and the seal ring of the old lter on the
new one (replace if necessary). Insert the cage and tie it to
the lter using the ties (one every 2 bags) at the bottom of
the lter.
Don’t cut the excess off the tie
after pulling tight. This prevents
leaving sharp parts that could
damage the lter during normal
use and shaking.
Before positioning the motor head on the lter, arrange
the lter properly in the lter chamber.
Position the lter with the
bags completely extended to
guarantee optimal ltering.
S2 - S3 service manual 40
E.5 - Filter
After having positioned the motor head, check the lter
shaker rod moves correctly. The lever must be in the central
position and the travel must be free in both directions
without any particular difculties.
If the movement isn’t right, lift the motor head and align
the lter. Try shaking again.
When shaking, hold the
knob correctly and take
care not to trap your
ngers.
S2 - S3 service manual 41
E.6 - Complete motor head
Open the closing band to remove the motor head from the
ltering chamber.
Open it out completely to remove it from the side link.
Take care not to injure your
hands with the snap catch.
Remove the whole motor head, lifting it our of the frame,
making sure you have a rm grip on it. Use the handles on
the sides of the motor head.
Before closing the band
again, centre the motor
head properly on the
ltering chamber. The
motor head ange must
be centred and positioned
perfectly on the seal of the
lter ring.
S2 - S3 service manual 42
E.6 - Complete motor head
Remove the motor head, pulling out the hex-pin cage from
the bush.
When replacing the motor head,
make sure the cage is inserted
correctly in the bush and the lter
bags are extended properly with
no twists.
It may be easier to assemble the
cage rst on the motor head and
then position both on the ltering
chamber. In this case, take great
care not to trap your ngers.
Proceed by unscrewing the lter shaker knob.
Unscrew the 4 screws positioned every 90° around the
motor head.
S2 - S3 service manual 43
E.6 - Complete motor head
Remove also the screw under the main switch.
All the screws are the same length, except the one under
the main switch which is much longer.
Now the motor cover can be removed from the base. Take
particular care with the main switch. Pull it out, removing
also the control panel.
S2 - S3 service manual 44
E.6 - Complete motor head
Hold the bottom edge to remove the motor cover. Pull the
cover out, then up.
Pull the motor cover off, taking
care not to damage the control
panel.
Turn the motor cover over and unscrew the screws inside.
Remove the motor cover from the top cover.
S2 - S3 service manual 45
E.6 - Complete motor head
Remove the sponge in the specic housing of the motor
cover.
If you have to bond parts of the sponge that have come
unstuck, clean the surfaces thoroughly and only then stick
the sound-proong sponge back on using a few drops of
liquid glue.
In any case we recommend
using original spare parts,
which include pre-bonded
sponges.
Remove the round sponge in the lter shaker lever.
S2 - S3 service manual 46
E.6 - Complete motor head
Remove the sponge from its seat.
The 4 recessed nuts should be tted in the 4 holes every
90°.
Pull the press-t pipes off the connectors.
During assembly make
sure they t properly in
the connectors and that
the yellow and blue colour
codes are respected.
Pull the pipes off the internal clips.
S2 - S3 service manual 47
E.6 - Complete motor head
Pass the cables and tubes through the right holes.
Disconnect the motors from the electronic board, pulling
the Faston terminals off connectors M1-M2-M3.
Connector M3 isn’t used in
2 motor heads.
Pull the 3 Faston terminals of the motors off connectors L
on the terminal board. Pull also the Faston terminal of the
blue cable off connector N on the terminal board.
When wiring, make sure
the cables are laid out
properly and hold them in
place with appropriate ties.
S2 - S3 service manual 48
E.6 - Complete motor head
The bridge between L and N is wired in only on heads with
3 motors.
To remove the board, unscrew the hex-head screw at the
bottom.
Unscrew the screws at the sides of the board.
S2 - S3 service manual 49
E.6 - Complete motor head
Unscrew them both.
Remove the board, pulling it upwards.
Unscrew the screws and remove the power cable of the
main switch.
When wiring, make sure
the Faston terminals
are rmly xed on the
connectors and the
terminals are tight on the
terminal board.
S2 - S3 service manual 50
E.6 - Complete motor head
Remove also the cables going to the terminal board and
those connecting the switch to the components of the
electronic board.
Pull off the green connector and connect the blue and
brown wires to the board.
Pull off also the Faston terminals on the side of connectors
M1-M2-M3.
S2 - S3 service manual 51
E.6 - Complete motor head
Always make sure the Faston terminals have been crimped
correctly.
Remove the ties holding the cables on the motor mounting
plate to make wiring easier.
Before removing the board completely from the motor
head, check all the connectors have been disconnected.
S2 - S3 service manual 52
E.6 - Complete motor head
Don’t disconnect the wires by pulling on the wire, always
hold the Faston terminal or connector.
Remove the whole electronic board.
Each corner of the motor stator pack has an output cable.
2 blue cables connected to the brushes of the same motor,
2 connected respectively to connector M1-M2-M3 of the
board and 1 to the terminal board.
S2 - S3 service manual 53
E.6 - Complete motor head
Proceed by removing the motor mounting plate. Unscrew
all the hex-head M6 screws on the motor mounting plate
using a hex-head wrench .
Hold the plate rmly on both sides and lift.
The plates lifts away with the 3 motors mounted on it.
S2 - S3 service manual 54
E.6 - Complete motor head
To replace the motors, unscrew the 2 screws holding them
on the plate.
To remove the terminal board, screw in the 2 screws
holding it on the plate.
Pull the motor through the hole in the plate.
Take care not to damage
the cables. Turn or tilt the
motor to pull it out.
S2 - S3 service manual 55
E.6 - Complete motor head
Once removed, the motor has 2 seals (top and bottom) on
the fan.
Remove the 2 seals from the fan.
When assembling, make
sure the seals are in an
good condition (replace
if necessary) and tted
correctly.
Remove the 4 baseplates with the buttery vacuum cutoff
valves inside from their housing in the motor mount of the
head. The 3 spacers of the buttery vacuum cutoff valves
must face upwards as shown in the photo.
S2 - S3 service manual 56
E.6 - Complete motor head
Remove the base of the motor cover, unscrewing the 3
screws at the base.
The 3 screws are the same length.
Proceed by unscrewing the M8 screws on the motor
mount to remove the 2 spacers and the lter shaker.
On heads with 2 motors (S2) remove also the baseplate
closing the hole of the 3rd motor.
S2 - S3 service manual 57
E.6 - Complete motor head
Turn the motor head over and remove the 2 spacers.
Turn the head over again and loosen the central bolt
holding the lter shaker shaft.
Hold the shaft while you unscrew the bolt.
When xing the shaft with
the central screw, always
insert the serrated washer
to prevent it slipping when
shaking.
S2 - S3 service manual 58
E.6 - Complete motor head
Remove the lter shaker shaft, tilting it and moving it
upwards. Remove also the complete lter shaker.
During assembly, make
sure the square-seat shaft
is correctly inserted and the
round lever slides correctly
in the slot of the lter
shaker shaft.
Remove the base of the motor cover from the motor
mount.
Turn the motor mount and pull the ler shaker shaft out of
the central bush.
S2 - S3 service manual 59
E.6 - Complete motor head
Make sure the pipes are in the right position. Yellow on
the inner D.6x1/8” tting, blue on the external D.6x M5
tting.
The pipes are press-t in the ttings.
Use Locktite on the nuts of
the air ttings.
Unscrew the 3 screws holding the central bush on the
motor mount.
S2 - S3 service manual 60
E.6 - Complete motor head
Remove the bush and seal.
To dismantle the lter shaker system, unscrew the 4 screws
holding it on the plate.
Remove the lter shaker.
S2 - S3 service manual 61
E.6 - Complete motor head
To remove the 2 bumpers, unscrew the 2 bolts holding
them on the frame with a hex-head wrench.
Remove the bumpers and washer.
To remove the lter shaker shaft, pull it out from one side
of the bush.
S2 - S3 service manual 62
E.6 - Complete motor head
Then remove the shaft also from the other bush.
The 2 bushes must be press-t and inserted from the
outside in the holes on the box.
Make sure the bushes are
a correct t by sliding the
lter shaker shaft.
S2 - S3 service manual 63
E.6 - Complete motor head
To connect the components of the control panel, see part
H (Wiring).
Check the connection of the
power cable. The terminals must
only clamp the metal tips of the
Faston terminals and not the
plastic insulation.
Also check:
All the Faston terminals have
been crimped correctly. Check
they can’t be pulled off the
wires.
All the earth wires are
connected.
The buttons must turn the
system ON/OFF properly.
The indicators must function
properly (power ON, lters
blocked, etc.).
The pressure switch in the
electronic board is supplied pre-
set.
If the electronic board
malfunctions, don’t try to repair
it. Replace the whole board.
The power wires are already connected to the single-phase
motor.
Make sure Faston terminal 6.3 is connected to the board,
and Faston terminal 4.8 is connected to the terminal
board.
If the vacuum motors are
noisy or produce a lot of
sparks, the brushes may
need changing.
S2 - S3 service manual 64
E.6 - Complete motor head
To change the brushes, bend and release the tab holding
the motor cap.
Do the same with the tab on the other side. Open the
tongues holding the brushes.
Pull off the motor cap.
S2 - S3 service manual 65
E.6 - Complete motor head
Pull downwards and disconnect the Faston terminal with
the blue wire on the brushes.
Pull off carefully, taking
care not to damage the
tongue of the brushes.
Press down on the tongue blocking the motor brush with
a at blade screwdriver.
Pull out the brush.
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E.6 - Complete motor head
Insert a new brush, making sure it is facing the right way.
Make sure the tongue holds
it in place properly, so it
can’t come out of its seat.
Only replace the electric
power cable with one of the
same type as the original
H07 RN-F. The same rule
applies if an extension is
used. All the sockets, plugs
and commutators must
have the same IP protection
degree as the vacuum
cleaner, as indicated on the
data plate.
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E.6 - Complete motor head
WARNING - DANGER !
After having repaired the motor head,
before plugging the vacuum cleaner into the electrical •
mains, make sure the voltage rating indicated on the
data plate corresponds to that of the electrical mains;
plug the vacuum cleaner into a properly earthed •
socket;
make sure the vacuum cleaner is turned off;•
if the plug has been changed, make sure the cable is •
in a perfect condition (damaged cables can cause
electric shocks).
The vacuum cleaner’s power socket must be protected •
by a differential circuit-breaker with surge current
limitation that cuts off the power supply when the
current discharged to earth exceeds 30 mA for 30 ms
or an equivalent protection circuit.
If there are electrostatic currents on the vacuum •
cleaner, the earth is probably not connected or
in a poor condition. In this case check the earth
connections, in particular those of the inlet ttings;
the hose must be antistatic.
F
Spare parts
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F.1 - Spare parts
Use the current spare part list.
G
Tools
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G.1 - Special tools
Digital multimeter
Used to check the amperage (Amps) and voltage (Volts).
Vacuum meter
Used to measure the vacuum power with the inlet closed
(mbar).
Airow meter
Used to measure the airow with the inlet open (m3/h).
H
Wiring
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H.1 - Wiring diagram
ABBREV. COMPONENT
M1 Motor switch 1
M2 Motor switch 2
M3 Motor switch 3
MSE Filter shaker motor
CL1 Level control
PR1 Compressed air pressure switch
HA1 Alarm - air speed in the suction tube is less than 20 m/s
C1 Antidisturb lter
Q1 Main switch
