Page 1
SC351
Service Manual
Advance SC351, 9087342020
Nilsk SC351, 9087340020 - 9087341020
English
2013-05 Form No. 9099876000
Page 2
Table of Contents
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Machine General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Service Manual Purpose and Field of Application . . . . . . . . . . . . . . . . . . . . . . 4
Other Reference Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Service and Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Serial Number Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Visible Symbols on the Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Machine Lifting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Machine Transportation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Machine Nomenclature (know your machine) . . . . . . . . . . . . . . . . . . . . . . . . 9
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Service and Diagnostic Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Scheduled Maintenance Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Table of Contents 2Service Manual – SC351
Chassis System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Frame (main parts). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Maintenance and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
General Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Recovery System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Maintenance and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Page 3
Table of Contents 3Service Manual – SC351
Scrub System, Disc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Maintenance and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Solution System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Squeegee System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Maintenance and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Wheel System, Non-Traction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Page 4
Service Manual – SC351
General Information
General Information
Machine General Description
The SC351 is a “walk behind” industrial machine designed to wash and dry oors in one pass. The machine is
powered by on-board batteries. The machine is equipped with disc brushes, a controlled solution ow dosing
system and a squeegee with blades integrated in the deck, which vacuums and dries the oor.
Service Manual Purpose and Field of Application
The Service Manual is a technical resource intended to help service technicians when carrying out maintenance and repairs on the SC351, to guarantee the best cleaning performance and a long working life for the
machine.
Please read this manual carefully before performing any maintenance and repair procedure on the machine.
Other Reference Manuals
4
Model Product Code User Manual Spare Parts List
Advance SC351 9087342020 9099867000 9099868000
Nilsk SC351 9087340020
Nilsk SC351 9087341020
These manuals are available at:
• Local Advance or Nilsk retailer
• Advance website: www.advance-us.com
• Nilsk website: www.nilsk.com
9099864000 9099865000
Page 5
Service Manual – SC351
General Information
Conventions
Forward, backward, front, rear, left or right are intended with reference to the operator’s position, that is to
say in driving position.
Service and Spare Parts
Service and repairs must be performed only by authorised personnel or Advance/Nilsk Service Centers. The
authorised personnel is trained directly at the manufacturer’s premises and has original spare parts and accessories.
Contact Advance or Nilsk Retailer indicated below for service or to order spare parts and accessories, specifying the machine model and serial number.
(Apply Retailer label here)
5
Serial Number Label
The machine serial number and model name are
marked on the plate (see the example to the side).
Product code and year of production are marked on
the same plate.
This information is useful when requiring machine
spare parts. Use the following table to write down
the machine identication data.
Model: Scrubber-Dryer SC351
Prod. Nr: 9087342020
GVW: 80 kg/176 lb
42 A
Type E Floor cleaning machine
UL STD 583
CSA STD C22.2 N.68-92
A Nilsk-Advance Brand
IPX4
Charg.100-240Vac 50/60Hz
Control Nr:
3084826
Serial No: ..................
Date code: .......
LpA = 64 dB(A)
Battery 12 Vdc
2%
“Made in Hungary”
Nilfisk-Advance, Inc.
Plymouth, MN, USA
www.advance-us.com
P100771
MACHINE model .............................................................................................
PRODUCT number ..........................................................................................
MACHINE serial number .................................................................................
Page 6
Service Manual – SC351
General Information
Safety
The following symbols indicate potentially dangerous situations. Always read this information carefully and
take all necessary precautions to safeguard people and property.
Visible Symbols on the Machine
WARNING!
Carefully read all the instructions before performing any operation on the machine.
WARNING!
Do not wash the machine with direct or pressurized water jets.
WARNING!
max.2%
Do not use the machine on slopes with a gradient exceeding the specications.
6
Symbols
Danger! It indicates a dangerous situation with risk of death for the operator.
Warning! It indicates a potential risk of injury for people or damage to objects.
Caution! It indicates a caution related to important or useful functions.
Note: It indicates a remark related to important or useful functions.
General Instructions
Specic warnings and cautions to inform about potential damages to people and machine are shown below.
Warning! Make sure to follow the safety precautions to avoid situations that may lead to
serious injuries.
− Before performing any cleaning, maintenance, repair or replacement procedure, turn the func-
tion selection knob to “0” and disconnect the battery connector.
− This machine must be used by properly trained operators only.
− Do not wear jewels when working near electrical components.
− Do not work under the lifted machine without supporting it with safety stands.
− Do not operate the machine near toxic, dangerous, ammable and/or explosive powders, liquids
or vapours: This machine is not suitable for collecting dangerous powders.
− Keep the battery away from sparks, ames and incandescent material. During the normal opera-
tion explosive gases are released.
− Battery charging produces highly explosive hydrogen gas. Keep the cover open during battery
charging and perform this procedure in well-ventilated areas and away from naked ames.
Page 7
Service Manual – SC351
Caution! Make sure to follow the safety precautions to avoid situations that may lead to
− Carefully read all the instructions before performing any maintenance/repair procedure.
− Before using the battery charger, ensure that frequency and voltage values, indicated on the
machine serial number plate, match the electrical mains voltage.
− Do not pull or carry the machine by the battery charger cable and never use the battery charger
cable as a handle. Do not close a door on the battery charger cable, or pull the battery charger
cable around sharp edges or corners. Do not run the machine on the battery charger cable.
− Keep the battery charger cable away from heated surfaces.
− Do not use the machine if the battery charger cable or plug is damaged. If the machine is not
working as it should, has been damaged, left outdoors or dropped into water, return it to the
Service Center.
− To reduce the risk of re, electric shock, or injury, do not leave the machine unattended when
it is plugged in. Before performing any maintenance procedure, disconnect the battery charger
cable from the electrical mains.
− Do not smoke while charging the battery.
− Always protect the machine against the sun, rain and bad weather, both under operation and
inactivity condition. Store the machine indoors, in a dry place: This machine must be used in dry
conditions, it must not be used or kept outdoors in wet conditions.
− Before using the machine, close all doors and/or covers as shown in the User Manual.
− This machine is not intended for use by persons (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless they have been given
supervision or instruction concerning use of the machine by a person responsible for their safety.
− Children should be supervised to ensure that they do not play with the machine.
− Close attention is necessary when used near children.
− Use only as shown in this Manual. Use only Advance or Nilsk’s recommended accessories.
− Check the machine carefully before each use, always check that all the components have been as-
sembled before use. If the machine is not perfectly assembled it can cause damages to people and
properties.
− Take all necessary precautions to prevent hair, jewels and loose clothes from being caught by the
machine moving parts.
− Pay attention to the machine moving parts. When using the machine, the deck can abruptly turn
by 180°.
− Do not use the machine on an incline.
− Do not tilt the machine more than the angle indicated on the machine itself, in order to prevent
instability.
− Do not use the machine in particularly dusty areas.
− Use the machine only where a proper lighting is provided.
− While using this machine, take care not to cause damage to people or objects.
− Do not bump into shelves or scaffoldings, especially where there is a risk of falling objects.
− Do not lean liquid containers on the machine, use the relevant can holder.
− The machine operating temperature must be between +32°F and 104°F (0°C and +40°C).
− The machine storage temperature must be between +32°F and 104°F (0°C and +40°C).
− The humidity must be between 30% and 95%.
serious injuries, damages to materials or equipments.
General Information
7
Page 8
Service Manual – SC351
− When using oor cleaning detergents, follow the instructions on the labels of the detergent bot-
tles.
− To handle oor cleaning detergents, wear suitable gloves and protections.
− Do not use the machine as a means of transport.
− Do not allow the brush to operate while the machine is stationary to avoid damaging the oor.
− In case of re, use a powder re extinguisher, not a water one.
− Do not tamper with the machine safety guards and follow the ordinary maintenance instructions
scrupulously.
− Do not allow any object to enter into the openings. Do not use the machine if the openings are
clogged. Always keep the openings free from dust, hairs and any other foreign material which
could reduce the air ow.
− Do not remove or modify the plates afxed to the machine.
− This machine cannot be used on roads or public streets.
− Pay attention during machine transportation when temperature is below freezing point. The
water in the recovery tank or in the hoses could freeze and seriously damage the machine.
− Use brushes and pads supplied with the machine or those specied in the User Manual. Using
other brushes or pads could reduce safety.
− In case of machine malfunctions, ensure that these are not due to lack of maintenance. If neces-
sary, request assistance from the authorised personnel or from an authorised Service Center.
− If parts must be replaced, require ORIGINAL spare parts from an Authorised Dealer or Retailer.
− To ensure machine proper and safe operation, the scheduled maintenance shown in the relevant
chapter of this Manual, must be performed by the authorised personnel or by an authorised Service Center.
− Do not wash the machine with direct or pressurised water jets, or with corrosive substances.
− The machine must be disposed of properly, because of the presence of toxic-harmful materials
(battery, etc.), which are subject to standards that require disposal in special centres (see Scrapping chapter).
General Information
8
Machine Lifting
Warning! Do not work under the lifted machine without supporting it with safety stands.
Machine Transportation
Warning! Before transporting the machine, make sure that:
All covers are closed.
The battery is disconnected.
The machine is securely fastened to the means of transport.
Page 9
Service Manual – SC351
Transparent cover with vacuum grid
Machine Nomenclature (know your machine)
Vacuum grid with
automatic shut-off float
Battery charger
cable holder
Recovery tank
Battery
connection
connector
General Information
Handlebar with
control panel
9
Fuses
Serial number plate/
technical data/
conformity certification
Cover latch
Accessory and battery
compartment cover
(open)
Squeegee blades
assembly
GEL/AGM
battery
Battery charger
Brush/pad-holder deck
Squeegee vacuum hose
Brush rotation direction
Squeegee
Deck bumper
wheels
Brush deck wheels
Can holder
Battery charger
cable
Accessory and battery
compartment cover (closed)
Solution tank filler plug
Vacuum system
motor
Rear wheels
on fixed axle
Solution tank
Brush deck gearmotor
P100772
Page 10
Service Manual – SC351
Program selection knob/rotary switch
Control Panel
General Information
10
Scrubbing program:
brush - solution flow activation
Drying program:
brush - vacuum system activation
Brush levers
Battery charge LED indicators
Machine start-up
enabling push-button
Scrubbing and drying program: Brush activation
- Vacuum system activation
- Solution flow activation
Machine switching off “0”
Handlebar inclination adjusting lever
Brush levers
Solution flow switch
P100773
Page 11
Service Manual – SC351
General Information
Service and Diagnostic Equipment
Besides a complete set of standard meters, the following instruments are necessary to perform fast checks and
repairs on Nilsk-Advance machines:
• Laptop computer charged with the current version of EzParts, Adobe Reader and (if possible) Internet
connection
• Digital Volt Meter (DVM)
• Amp clamp with possibility of making DC measurements
• Hydrometer
• Battery charge tester to check 12 V batteries
• Static control wrist strap
• Dynamometric wrench set
• A copy of the User Manual and Spare Parts List of the machine to be serviced (provided with the machine
or available at www.advance-us.com or other Nilsk-Advance websites).
The following equipment is also available at Nilsk-Advance Centers:
• Vacuum water lift gauge, P/N 56205281
11
Page 12
Service Manual – SC351
General Information
Technical Data
Description
Solution tank capacity 2.9 USgal (11 litres)
Recovery tank capacity 2.9 USgal (11 litres)
Min/max machine length at the handlebar 31.9 in/50 in (810 mm/1,270 mm)
Machine width 18.5 in (470 mm)
Min/max machine height with adjustable handlebar 550/1,000 mm (21.6/39.4 in)
Minimum turning radius 21.6 in (550 mm)
Cleaning width 14.5 in (370 mm)
Diameter of wheels on xed axle 8.4 in (214 mm)
Wheel pressure on the oor (*) 72.5 psi (0.5 N/mm
Brush/pad diameter 14.5 in (370 mm)
Brush/pad pressure on the oor 39.6 lb (18 Kg)
Brush/pad pressure with full tank 59.5 lb (27 Kg)
Min/max solution ow
Sound pressure level at workstation (ISO 11201, ISO 4871, EN
60335-2-72) (LpA)
Machine sound pressure level (ISO 3744, ISO 4871, EN 60335-2-
72) (LwA)
Vibration level at the operator’s arms (ISO 5349-1, EN 60335-2-72)
Maximum gradient when working 2%
IP protection class
Protection class (electric)
Vacuum system motor power 0.27 hp (200 W)
Vacuuming (with closed inlet) 27.7 in/H
Brush motor power 0.35 hp (260 W)
Brush motor speed 140 rpm
Total absorbed power 42 A (0.5 kW)
Battery compartment size 17.8x6.9x9.4 in (350x175x240 mm)
Battery voltage 12 V
Standard battery 12 V 84 AhC5 AGM -
Battery charger 100-240 VAC
Work autonomy (standard battery) 2 hour 1 hour
Weight without battery and with empty tanks
Gross vehicle weight (GVW) 176 lb (80 Kg)
Shipping weight
Advance
SC351
One drop: 0.066 gpm (0.25 litres/min)
Two drops: 0.13 gpm (0.5 litres/min)
92.6 lb (42 Kg) 97.0 lb (44 Kg) 97.0 lb (44 Kg)
171.9 lb (78 Kg) 105.8 lb (48 Kg) 154.3 lb (70 Kg)
Nilsk
SC351
64 dB(A) ± 3 dB(A)
84 dB(A)
2
98.4 in/s
(< 2.5 m/s2)
X4
III
O (710 mmH
2
2
)
O)
2
12
Nilsk
SC351 full PKG
12 V 55 AhC20 AGM
spiralcell
(*) Machines have been tested under the following conditions:
◦ Battery maximum size
◦ Maximum brush and squeegee size
◦ Full clean water tank
◦ Optional equipment installed
◦ Wheel weight checked
◦ Print on the oor checked on cement for each single wheel
◦ Result expressed as maximum value for both front and rear wheels
Page 13
Service Manual – SC351
Dimensions
17 in - 432 mm
General Information
13
28.5 in - 726 mm
17 in - 432 mm
18.7 in - 475 mm
P100774
Page 14
Service Manual – SC351
General Information
Maintenance
The lifespan of the machine and its maximum operating safety are ensured by correct and regular maintenance.
Warning! Read carefully the instructions in the Safety chapter before performing any
maintenance procedure.
The following tables provides the scheduled maintenance. The intervals shown may vary according to particu-
lar working conditions, which are to be dened by the person in charge of the maintenance.
For instructions on maintenance procedures, see the following paragraphs.
Scheduled Maintenance Table
14
Procedure
Battery charging
Squeegee Cleaning
Brush Cleaning
Tank and Vacuum Grid Cleaning
Squeegee blade check and/or replacement
Solution valve check and cleaning
Brush deck rotation clutch check and/or replacement
Daily, after using the
machine
Weekly
Every six
months
Yearly
Page 15
Chassis System
Frame (main parts)
1. Frame
2. Handlebar holder
3. Wheels on xed axle
2
Chassis System 15Service Manual – SC351
1
3
P100775
Page 16
Control System
Functional Description
Control System 16Service Manual – SC351
The function control is performed with the program
selection knob/rotary switch (SW1), the machine
start-up enabling push-button (SW2) (which must be
used simultaneously with the brush levers) and the
solution ow switch (SW3).
The switch outputs controls the relevant outputs: re-
The LED electronic board (EB1) is equipped with 3
LEDs which indicate the battery charge level, both
during operation and while recharging:
Battery charge level
LED display
lay (K1) for brush motor, relay (K2) for vacuum system motor, solenoid valve (EV).
The control circuit are protected by the fuse (F3).
The negative output of the battery charger (B2) allows function activation when battery level is sufcient and the battery charger is not connected to the
electrical mains.
Diagram of Output Activation according to the Position of the Switches (SW1), (SW2)
and (SW3)
Program selection knob/
rotary switch (SW1)
settings
O
Machine start-up
enabling push-button
(SW2) settings (with
brush activation levers)
Pressed/released Off Off Off
Released Off Off On
Pressed On On On
Released Off Off Off
Pressed On On Off
Released/ Off Off On
Pressed On Off On
Brush motor (M1) Solenoid valve (EV) Vacuum system motor
(M2)
Solution ow push-button setting (SW3) Symbols Solenoid valve ON time
0
1
(EV)
2 sec 2 sec
Always ON -
Solenoid valve OFF time
(EV)
Page 17
Component Locations
Control System 17Service Manual – SC351
• Handlebar with control panel
• Program selection knob/rotary switch (SW1)
• LED electronic board (EB1)
• Brush levers
Machine start-up
enabling push-button
(SW2)
Solution ow switch
(SW3)
Handlebar with control
panel
Brush levers
Handlebar inclination
and height adjusting
lever
• Machine start-up enabling push-button (SW2)
• Solution ow switch (SW3)
• Wiring harness
• Handlebar inclination adjusting lever
Program selection
knob/rotary switch
(SW1)
Wiring harness
LED electronic board
(EB1)
P100777
Page 18
Removal and Installation
LED Electronic Board (EB1) Disassembly/Assembly
Control System 18Service Manual – SC351
Disassembly
1. Drive the machine on a level oor. Make sure
that the machine cannot move independently.
2. Turn the machine program selection knob to “0”.
3. Disconnect the battery connector.
4. On the lower side of the handlebar with the
control panel, unscrew the screws (A).
5. Lower the upper side (B) of the handlebar with
the control panel.
A
A
6. Disconnect the connector (C) of the LED
electronic board (D). Remove the screws (E) and
remove the LED electronic board (D).
7. If necessary, disconnect the connector (F) and
remove the solution ow push-button (G) by
disengaging the inner tabs (H).
B
A
A
G
C
F
E
D
P100778
H
E
Page 19
Control System 19Service Manual – SC351
LED Electronic Board (EB1) Disassembly/Assembly (Continues)
8. If necessary, remove the selector assembly (N) of the machine program selection knob (I), as shown
below:
• Disconnect the connectors (J)
• On the outer side, turn the knob (I) on the position (K) (vacuum system activation).
• Loosen the threaded dowel inside the housing (L), then remove the knob (I) from the housing.
• Remove the screws (M) and, from the inside, remove the selector assembly (N) of the knob (I).
Assembly
9. Assemble the components in the reverse order of disassembly.
J
N
J
K
I
L
M
P100779
Page 20
Machine Enabling Push-Button Disassembly/Assembly (SW2)
Disassembly
1. Drive the machine on a level oor. Make sure that the machine cannot move independently.
2. Turn the machine program selection knob to “0”.
3. Disconnect the battery connector (red).
4. On the lower side of the handlebar with the control panel, unscrew the screws (A).
5. Move the upper side (B) of the handlebar with the control panel.
6. Remove the screws (C) and move the lower side (D) of the handlebar from the frame (E).
7. Disconnect the connectors (F) of the brush enabling push-button (G).
8. Remove the screws (H) and remove the switch (G).
9. If necessary, remove from the housing the enabling push-button (I) of the switch (G).
10. If necessary, remove the brush levers (J) from the housing.
Control System 20Service Manual – SC351
Assembly
11. Assemble the components in the reverse order of disassembly.
A
A
A
A
CC
B
I
H
D
E
J
J
F
F
G
P100780
Page 21
Specications
2341
LED electronic board connector (EB1)
JA: 4-way vertical Tyco Modu II type
Control System 21Service Manual – SC351
PIN Description Electronic board
in/out
1 Common cathode LED power supply in 0 V <1 A
2 RED anode LED power supply in 0.7 V <1 A
3 YELLOW anode LED power supply in 0.7 V <1 A
4 GREEN anode LED power supply in 0.7 V <1 A
V ref. I max.
Page 22
Electrical System 22Service Manual – SC351
LED
Electrical System
Functional Description
The program selection knob/rotary switch (SW1) and the machine start-up enabling push-button (SW2) controls the vacuum brush motor relay (K1) for the activation of the brush motor (M1) and the vacuum system
motor relay (K2) for the activation of the vacuum system motor (M2).
The solenoid valve (EV) is controlled by the solenoid valve timer relay (KT1) when the solution ow switch
(SW3) is turned to 0 (minimum ow); the timer is bypassed when the solution ow switch (SW3) is turned to
1 (maximum ow).
The battery charger (CH) supplies negative power to all the control relays only when the battery charge is suf-
cient and the battery charger is not connected to the electrical mains.
The machine system is connected to the battery with the connector (C1).
Fuses
The brush motor (M1) is protected by the brush motor fuse (F1). The vacuum system motor (M2) is protected
by the vacuum system motor fuse (F2). The solenoid valve (EV) is protected by the function selector fuse (F3).
The battery charger (CH) has inner safety protections which are not accessible.
Wiring Diagram
ELECTRONIC BOARD (EB1)
RYG
12 V BATTERY (BAT)
CONNECTOR (C1)
BATTERY CHARGER (CH)
CONNECTOR (C1)
P100781
Page 23
Component Locations
• Battery charger (CH)
• 12V Battery (BAT)
• Connector (C1)
• Battery wiring harness
• Machine wiring harness
• Brush motor fuse (F1)
12V Battery (BAT)
Battery charger (CH)
Electrical System 23Service Manual – SC351
• Vacuum system motor fuse (F2)
• Function selector fuse (F3)
• Brush motor relay (K1)
• Solenoid valve timer relay (KT1)
• Vacuum system motor relay (K2)
Function selector fuse
(F3)
Vacuum system motor
fuse (F2)
Brush motor fuse (F1)
Brush motor relay (K1)
Battery wiring harness
Connector (C1)
Machine wiring
harness
Solenoid valve timer
relay (KT1)
Vacuum system motor
relay (K2)
P100782
Page 24
Electrical System 24Service Manual – SC351
Maintenance and Adjustments
Battery Installation
1. Open the cover and check that the battery connector is disconnected.
2. Install the battery on the machine, connect the terminals and fasten it with the relevant belt.
Warning! This machine requires sealed lead batteries (GEL or AGM technology). Do not use
batteries with liquid electrolyte or not sealed (WET) for any reason.
Warning! Pay special attention when connecting the battery pins. The red cable must be
connected to the positive pin (+), the black cable must be connected to the negative
pin (-) of the battery. A wrong connection can damage the battery charger.
Warning! The installed battery (GEL/AGM) may require a specic charging algorithm: See the
Battery Charger Setting and Dipswitch Conguration paragraph to set the proper
charging algorithm for the installed battery.
3. Connect the battery connector and close the cover.
4. Charge the battery.
Battery charging
Note: Charge the batteries when the yellow or red LED turns on, or at the end of each working
cycle. Keeping the batteries charged make their life last longer.
Caution! When the battery is discharged, charge is as soon as possible, as that condition
makes its life shorter. Check for battery charge at least once a week.
1. Drive the machine on a level oor.
2. Check that the function selection knob is turned to “0”.
3. Connect the battery charger cable to the electrical mains (the electrical mains voltage and frequency
must be compatible with the battery charger values shown on the machine serial number plate).
Note: When the battery charger is connected to the electrical mains, all machine functions
are automatically cut off. The red or yellow warning light (37) is on when the battery
charger is charging the batteries.
4. When the green warning LED stays on, the battery charging cycle is over.
5. When the battery charging is completed, disconnect the battery charger cable from the electrical mains
and wind it round its housing.
6. Now the machine is ready to be used.
Note: For further information about the operation of the battery charger, see the relevant
Manual attached.
Page 25
Electrical System 25Service Manual – SC351
CBHD2 12V 12A IUIa OPTIMA DIPSWITCH CONFIGURATION
Battery Charger Setting and Dipswitch Conguration
To change the dipswitch conguration, remove the round white cap near the openings (see the illustration
below), with a screwdriver.
P100782
SW1
DP1 DP2
ON
ON
ON
RED YELLOW GREEN
LED LED LED
SW1 LED CODES (*) CHARGING CURVES
DP1 DP2 BATTERY CHARGING LEDS (on the control
panel)
ON ON 2 ashes of the GREEN LED Charging algorithm for generic Gel and AGM battery
ON OFF 2 ashes of the RED and GREEN LEDS Charging algorithm for AGM DISCOVER battery
OFF ON 2 ashes of the YELLOW and GREEN LEDS Charging algorithm for OPTIMA battery
OFF OFF 2 ashes of the YELLOW LED Charging algorithm for EXIDE SONNENSCHEIN Gel battery
OFF
(default for Advance model)
(default for Nilsk model)
OFF
P100783
(*) The LED codes are shown by the battery charge indicators each time that the battery charger is turned
on, before the charging cycle starts.
Battery Charger Auxiliary Functions
The battery charger is also used to:
7. Check the battery voltage during machine operation.
8. Display the battery charge level with the led electronic board (EB1).
9. Stop the machine operation when the battery is discharged (10.8 V).
10. Disable the machine operation during battery recharging.
For this reason, the following battery charger auxiliary contacts are used:
• B1: (ref. + 12 V) Enabling input for machine start-up.
• B2: (ref. 0 V) Output for machine function activation.
Page 26
Electrical System 26Service Manual – SC351
Fuse Check and Replacement
Fuses in the electric component box
1. Drive the machine on a level oor.
2. Check that the function selection knob is turned to “0” and disconnect the battery connector.
3. Open the cover and check one of the following fuses for deactivation or integrity:
◦ (A): brush motor fuse circuit breaker (F1) 35 A.
◦ (B): vacuum system motor blade fuse (F2) 30 A.
◦ (C): function selector blade fuse (F3) 5 A.
4. Reset or replace any fuse, after having checked and repaired any problem that caused deactivation.
5. Close the cover.
C
B
A
P100784
Page 27
Troubleshooting
Trouble Possible Causes Remedy
The machine is not working The battery connector (C1) is not connected or broken Connect or replace it
Electrical System 27Service Manual – SC351
The 12V batteries (BAT) are discharged or its connections
are not efcient
The 12V batteries (BAT) are broken Check the battery no-load voltage
The battery charger (CH) is broken Replace
The function selector fuse (F3) is open Replace
The wiring harness is cut or pressed or short circuited Repair
The program selection knob/rotary switch (SW1) is not
working
The battery has been connected with inverted polarity Replace the battery charger
Charge the batteries or clean/repair the
connections
Replace
Page 28
General Wiring Diagram
BRUSH MOTOR FUSE (F1)
Electrical System 28Service Manual – SC351
BRUSH
MOTOR (M1)
VACUUM SYSTEM
MOTOR FUSE (F2)
PROGRAM SELECTION
KNOB/ROTARY SWITCH (SW1)
VACUUM SYSTEM
MOTOR RELAY (K2)
MACHINE START-UP
ENABLING
PUSH-BUTTON (SW2)
VACUUM SYSTEM
MOTOR (M2)
SOLENOID VALVE
TIMER RELAY (KT1)
FUNCTION SELECTOR FUSE (F3)
BATTERY CHARGER (CH)
DIODE (D2)
DIODE (D1)
RYG
SOLUTION FLOW
SWITCH (SW3)
BRUSH MOTOR
RELAY (K1)
LED ELECTRONIC
BOARD (EB1)
12 V BATTERY (BAT)
CONNECTOR (C1)
BRUSH MOTOR
RELAY (K1)
VACUUM SYSTEM
MOTOR RELAY (K2)
CONNECTOR (C1)
SOLENOID VALVE (EV)
P100785
Page 29
Specications
Electrical System 29Service Manual – SC351
Description
Total absorbed power 42 A (0.5 kW)
Battery compartment size 17.8x6.9x9.4 in (350x175x240 mm)
Battery voltage 12 V
Standard batteries
Battery charger 100-240 VAC
Work autonomy (standard batteries)
Advance
SC351
12 V 85 AhC5 AGM -
2 hour 1 hour
Nilsk
SC351
SC351 full PKG
12 V 55 AhC20 AGM
Nilsk
spiralcell
Page 30
Recovery System 30Service Manual – SC351
Recovery System
Functional Description
The water recovery system removes the dirty water from the oor and pipes it to a recovery tank. When the
machine is running, the dirty water on the oor is collected by the squeegee blades and collected through the
slots in the same, piped through the vacuum hose and into the tank by the airow created by vacuum motor
(M2). The dirty water is piped into the recovery tank, while the airow continues to the vacuum fan.
The vacuum system motor (M2) is supplied by the vacuum system motor relay (K2) which is driven by the
program selection knob/rotary switch (SW1) when it is turned to 1 or 3. The circuit is protected by the vacuum
system motor fuse (F2).
The automatic oat in the vacuum grid stops vacuum system motor (M2) from collecting any liquids.
When the automatic oat closes and shuts down the vacuum system, the vacuum system motor noise will increase and the oor will not be dried.
When the recovery tank is full it must be emptied.
Wiring Diagram
VACUUM SYSTEM
MOTOR FUSE (F2)
PROGRAM SELECTION
KNOB/ROTARY SWITCH (SW1)
VACUUM SYSTEM
MOTOR RELAY (K2)
VACUUM SYSTEM
MOTOR RELAY (K2)
VACUUM SYSTEM
MOTOR (M2)
FUNCTION
SELECTOR FUSE (F3)
BATTERY CHARGER (CH)
P100786
Page 31
Component Locations
• Recovery tank
• Vacuum system/tank connection gasket
Recovery tank
Squeegee vacuum
hose
Recovery System 31Service Manual – SC351
• Squeegee vacuum hose
• Vacuum system motor (M2)
Vacuum system/tank
connection gasket
Vacuum system motor
(M2)
P100787
Page 32
Component Locations (Continues)
Recovery System 32Service Manual – SC351
• Transparent cover
• Vacuum grid with automatic shut-off oat
• Cover gasket
Vacuum grid with
automatic shut-off
oat
Cover gasket
• Vacuum system motor fuse (F2)
• Vacuum system relay (K2)
Transparent cover
Vacuum system motor
fuse (F2)
Vacuum system relay
(K2)
P100788
Page 33
Maintenance and Adjustments
J
Tank and Vacuum Grid Cleaning
1. Drive the machine to the appointed disposal
area.
2. Check that the function selection knob is turned
to “0” and disconnect the battery connector.
3. Remove the cover (A), clean and wash the cover
and the vacuum grid (B) with clean water.
4. Drain the water from the tanks (C and D) and
clean them.
5. If necessary, disassemble the grid (B) and
remove the oat (E), than clean with care and
reinstall.
Recovery System 33Service Manual – SC351
A
K
G
E
F
H
D
6. Check the recovery tank cover gasket (F) for
integrity.
Note: The gasket (F) creates
vacuum in the tank that is
necessary for vacuuming the
7. If necessary replace the gasket (F) by removing
it from its housing (G) on the cover. When
assembling the new gasket, install the joint (H)
in the area shown in the gure.
8. Check that the seating surface (I) of the gasket
(F) is clean and adequate for the gasket itself.
9. Check the vacuum duct (J) and the gasket (K),
carefully clean if necessary.
10. Reinstall the recovery tank cover (A).
recovery water.
C
B
I
I
P100789
Page 34
Vacuum System Gasket Cleaning
Recovery System 34Service Manual – SC351
Note: The gaskets (L) and (M)
create vacuum in the
system that is necessary
for vacuuming the recovery
water.
1. Drive the machine on a level oor.
2. Check that the function selection knob is turned
to “0” and disconnect the battery connector.
3. Open the cover (A) and check the vacuum
system motor gasket (L) for integrity.
4. If necessary replace the gasket by removing it
from its housing.
5. Remove the recovery tank (C).
6. Check the recovery water duct gasket (M) for
integrity. If necessary, replace the gasket.
7. Clean with care and reinstall.
A
L
C
M
P100790
Page 35
Troubleshooting
Trouble Possible Causes Remedy
The vacuum system motor (M2) does not
turn on.
The program selection knob/rotary switch (SW1) is
broken.
The vacuum system motor (M2) is faulty. Check the amperage.
The vacuum system motor fuse (F2) is open. Replace.
The vacuum system motor relay (K2) is broken. Replace.
Replace.
Replace.
Recovery System 35Service Manual – SC351
The recovery water vacuuming is
insufcient or there is no vacuuming.
The vacuum grid with automatic shut-off oat is activated
because the recovery tank is full.
The vacuum grid is dirty. Clean.
The transparent cover is not properly positioned. Adjust.
The tank cover gasket is not sealing. Clean/replace.
The vacuum system motor lter is dirty. Clean.
The vacuum gaskets are damaged or do not match
perfectly.
The squeegee or the vacuum hose is clogged or
damaged.
Drain the recovery tank.
Repair or replace.
Clean/repair/replace.
Warning! This procedure must be performed by qualied personnel only.
Measure the vacuum suction at the end of the recovery hose with a gauge
Note: For the particular shape of the end vacuum hose (not circular), this operation is to be
performed with a suitable rettangular support mounted on the gauge.
1. Disconnect the vacuum hose from the squeegee.
2. Turn the knob on the number 3 working program.
3. With the gauge verify that the value is 27.7 in/H2O (710 mmH2O)
P100791
Page 36
Recovery System 36Service Manual – SC351
Vacuum System Motor Amperage Check
1. Remove the solution and recovery water tanks.
2. Apply the amp clamp (A) on the cable (B).
3. Turn the knob on the working program.
4. Check that the motor amperage is between 15 and 18 A at 12 V.
5. Turn the knob to “0”.
6. Remove the amp clamp (B).
7. If the amperage is higher than specied, disassemble the vacuum system motor (see the procedure in
the relevant paragraph), and check the condition of its moving parts.
8. If the procedure does not lead to a correct amperage, it is necessary to replace the motor.
9. Reinstall the solution and recovery water tanks.
A
C
B
P100791
Page 37
Removal and Installation
Vacuum System Motor Disassembly/Assembly
Disassembly
1. Remove the solution and recovery water tanks.
2. Make sure that the battery connector is
disconnected.
Recovery System 37Service Manual – SC351
7. Remove the motor (B) and the acoustic
insulation pipe (G)
8. Check the gasket (F) and the gasket (H) for
damage. If necessary, replace.
3. Disconnect the 2 electrical connectors (A) for the
motor (B).
4. Remove the acoustic insulation panel (C).
5. Remove the screws (D), recover the washers and
nuts.
6. Remove the motor cover (E) and recover the
gasket (F).
B
A
H
L
Assembly
9. Assemble the components in the reverse order of
disassembly and note the following:
◦ When installing the gasket (I) into the hous-
ing (J) turn it until the lower tooth (K) and
upper teeth (L) are as shown in the gure.
◦ Install the motor (B) with the power supply
contacts as shown in the gure (M).
C
D
K
I
D
E
J
L
F
B
I
B
M
G
P100792
Page 38
Specications
Recovery System 38Service Manual – SC351
Description
Recovery tank capacity 2.9 USgal (11 litres)
Vacuum system motor power 0.27 hp (200 W)
Vacuuming (with closed inlet) 27.7 in/H
Advance
SC351
Nilsk
SC351
O (710 mmH
2
SC351 full PKG
O)
2
Nilsk
Page 39
Scub Sytem - Disc 39Service Manual – SC351
Scrub System, Disc
Functional Description
The disc brush system can be started by the operator.
The disc brush turns counter-clockwise.
The brush system, when turning, cleans/washes the oor surface and assists machine forward movement.
The deck, where brushes suitable for cleaning the particular type of oor are installed, is the main part of the
scrub system. The brush deck is xed and integrated in the machine with a support bracket. The adjusting sys-
tems adjusts the forward speed, while the handwheel on the deck adjusts the machine straight-forward drive.
The brush working pressure is functional to the machine designed balance.
The brush motor (M1) is supplied by vacuum brush motor relay (K1) which is driven by the program selection
knob/rotary switch (SW1) when it is turned to 1, 2 or 3, and the machine start-up enabling push-button (SW2)
is pressed. The circuit is protected by the brush motor fuse (F1).
The system, once activated, uses the solution coming form the solution system, to wash the oor.
To work properly, the brush motor needs the following:
• Program selection knob/rotary switch (SW1) turned to 1, 2 or 3
• Machine start-up enabling push-button (SW2) pressed
• Charged batteries (the red LED must not be ashing).
• Battery charger is completing path to battery negative for B2
When necessary, to use the squeegee in the opposite direction, pry on the handlebar and slightly lift the deck
while the brush is turning. The rubber pads mounted into the deck allow the mechanical rotation by creating
friction on the rotating brush. When the deck is turned by 180° start to scrub/dry by drawing the machine.
To resume working in the normal forward direction, push the machine forward until the brush deck returns
to the original position.
Wiring Diagram
BRUSH
MOTOR (M1)
BRUSH MOTOR FUSE (F1)
PROGRAM SELECTION
KNOB/ROTARY SWITCH (SW1)
MACHINE START-UP
ENABLING
PUSH-BUTTON (SW2)
BRUSH MOTOR RELAY (K1)
FUNCTION SELECTOR FUSE (F3)
BATTERY CHARGER (CH)
BRUSH MOTOR
RELAY (K1)
P100793
Page 40
Component Locations
• Brush deck
• Brush motor (M1)
• Drive hub
• Machine forward speed adjusting handwheel
Machine straight
forward movement
adjusting handwheel
Brush motor (M1)
Machine forward
speed adjusting
handwheel
Scub Sytem - Disc 40Service Manual – SC351
• Machine straight forward movement adjusting
handwheel
• Deck rotation end of stroke system
Brush deck
Drive hub
Deck rotation end of
stroke system
P100794
Page 41
Component Locations (Continues)
• Brush motor fuse (F1)
• Brush motor relay (K1)
Brush motor fuse (F1)
Brush motor relay (K1)
Scub Sytem - Disc 41Service Manual – SC351
P100781
Page 42
Maintenance and Adjustments
Brush Cleaning
Warning! It is advisable to wear protective gloves when cleaning the brush because there may
be sharp debris.
1. Remove the brush.
2. Clean the brush with water and detergent.
3. Check the brush bristles for integrity and wear; if necessary, replace the brush.
Machine Speed Adjustment
Note: Themachinespeedandforwardmovementvaryaccordingtothetypeofoortobe
cleaned and the choice of using the brush or the pad.
If necessary, perform the adjustments as shown.
1. Remove the recovery and the detergent tanks.
Scub Sytem - Disc 42Service Manual – SC351
2. Adjust the machine speed with the handwheel (A):
◦ Turn the handwheel counter-clockwise to increase the machine speed.
◦ Turn the handwheel clockwise to decrease the machine speed.
3. If it is difcult to keep the machine moving in a straight line because it deviates to the left or to the
right, adjust the handwheel (B) by turning it clockwise or counter-clockwise.
4. After adjusting, install the tanks.
5. With the machine ready to operate, perform hands-on tests of the machine and, if other adjustments are
necessary, repeat steps 1 to 4.
B
A
P100795
Page 43
Scub Sytem - Disc 43Service Manual – SC351
Troubleshooting
Open Circuit
• The Brush motor fuse (F1) determines an open in the supply circuit of the brush deck motor. This protects
the circuits from being damaged under overload conditions.
• The open in the fuse can be caused by the following:
• Short circuit in the brush motor wiring harness; fault in the motor.
Trouble Possible Causes Remedy
The brush does not clean properly The brush is excessively worn Replace
The brush does not turn The motor is faulty Check the motor amperage/replace
There are ropes or debris restraining the brush rotation Remove and clean
The Brush motor fuse (F1) is open Replace
The brush motor relay (K1) is damaged Replace
The program selection knob/rotary switch (SW1) is broken Replace
The levers or the machine start-up enabling push-button
(SW2) are broken
Replace
Warning! This procedure must be performed by qualied personnel only.
Page 44
Brush Motor Amperage Check
Scub Sytem - Disc 44Service Manual – SC351
1. Drive the machine on a level oor.
2. Remove the brush, as shown in the User
Manual.
3. Place two wooden shims (A) under the side area
of the deck as shown in the gure. Wooden shim
thickness must be 1.5 in (40 mm).
Warning! Keep the wooden shims at an
appropriate distance from the
brush hub.
4. Turn the knob on the brush activation program.
5. Apply the amp clamp (A) on one cable (B) of the
brush motor.
6. Turn on the brush by pressing the push-button
(39) together with the levers (40), then check
that the motor amperage (C) is 6 to 8 A at 12 V.
7. Turn off the brush by releasing the levers (40).
8. Turn the knob (32) to “0”.
9. Remove the amp clamp (A).
10. If the amperage is higher, perform the following
procedures to detect and correct the abnormal
amperage:
◦ Check if there is dust or dirt (ropes, cables,
etc.) on the brush hubs.
◦ Disassemble the motor (see the procedure in
the relevant paragraph), and check the condition of all its components.
If the above-mentioned procedures do not lead to
a correct amperage, the motor must be replaced
(see the procedure in the relevant paragraph).
A
B
C
P100796
Page 45
Removal and Installation
Brush Deck Disassembly/Assembly
Scub Sytem - Disc 45Service Manual – SC351
Disassembly
1. Place the machine on a hoisting system (if
available), then lift it. Otherwise, drive the
machine on a level oor.
2. Make sure that the battery connector is
disconnected.
3. Disconnect the vacuum hose from the squeegee
(A).
4. Lift the machine and remove the brush.
5. Remove the centre screw, remove the hub
assembly (B) and retrieve the transmission pin
key (C).
6. Remove the 4 screws (D), the deck ange (E) and
disassemble the brush deck (F).
7. Check the rubber pads (G) for integrity, and
replace them if excessively worn.
Note: The rubber pads (G) allow the
deck mechanical rotation by
creating friction on the rotating
brush.
B
A
C
P100797
F
E
D
8. Check the end-of-stroke spacer tab (H) and
replace it if necessary.
9. Check the centre ange (I) and the relevant
springs for integrity, if necessary replace them.
Note: Thecentreange(I)absorbs
blows and vibrations between
the deck and the machine.
10. Upon reassembly, couple the centre ange with
the deck to match the reference arrows (J).
P100798
G
G
I
H
P100799
J
J
P100800
Page 46
Brush Deck Disassembly/Assembly (Continues)
11. Install the centre ange springs (K) by engaging
them on the deck housings and on the centre
ange housings (L) as shown in the gure.
Assembly
12. Assemble the components in the reverse order of
disassembly and note the following:
◦ Couple the tooth (M) of the end-of-stroke
spacer tab (N) and the deck ange, as shown
in the gure.
◦ Assemble the brush deck by matching the
deck ange polarization (O) with the one of
the deck holder (P).
Note: For further information on deck
components see the Spare Parts
List.
Scub Sytem - Disc 46Service Manual – SC351
K
P100801
M
L
P100802
N
P100799
O
P
P100803
Page 47
Brush Motor Disassembly/Assembly
Disassembly
1. Place the machine on a hoisting system (if
available), then lift it. Otherwise, drive the
machine on a level oor.
2. Make sure that the battery connector is
disconnected.
3. Disconnect the gearmotor connector (A) and the
detergent hose (B).
4. Lift the machine and remove the brush.
5. Disassemble the brush deck as shown by the
previous procedure.
6. Recover the key (C).
7. Remove the 4 screws (D).
8. Remove the gearmotor (E).
Scub Sytem - Disc 47Service Manual – SC351
P100804
Assembly
9. Assemble the components in the reverse order of
disassembly.
Note: For further information on deck
components see the Spare Parts
List.
P100805
Page 48
Specications
Scub Sytem - Disc 48Service Manual – SC351
Description
Brush/pad diameter 14.5 in (370 mm)
Brush/pad pressure on the oor 39.6 lb (18 Kg)
Brush/pad pressure with full tank 59.5 lb (27 Kg)
Brush motor power 0.32 hp (240 W)
Brush motor speed 140 rpm
Advance
SC351
Nilsk
SC351
Nilsk
SC351 full PKG
Page 49
Solution System 49Service Manual – SC351
Solution System
Functional Description
The solution system supplies the detergent to the brush when cleaning the oor. The solution tank is also the
main machine body. There is a manual valve on the left side of the tank to close the water supply whenever
maintenance must be performed on the machine.
The detergent quantity is adjusted by the operator with the solution ow switch (SW3). The solution ows
from the tank to the tap, through the lter and solenoid valve (EV) and then to the brush deck.
The solenoid valve (EV) is driven by the program selection knob/rotary switch (SW1) when it is turned to 1 or
2, and the machine start-up enabling push-button (SW2).
When the solution ow switch (SW3) is open the solenoid valve (EV) is driven by solenoid valve timer (KT1)
(2 sec. ON - 2 sec. OFF). When the solution ow switch (SW3) is closed the solenoid valve (EV) is always on
(by-pass the solenoid valve timer).
The circuit is protected by the function selector fuse (F3) on the LED electronic board (EB1).
The solenoid valve (EV) opening and closing time, according to the water ow, are shown below:
Solution ow switch (SW3)
setting
0 2 sec 2 sec
1 Always ON -
Wiring Diagram
PROGRAM SELECTION
KNOB/ROTARY SWITCH (SW1)
SOLENOID VALVE
TIMER (KT1)
Solenoid valve (EV) ON time Solenoid valve (EV) OFF time
FUNCTION SELECTOR
FUSE (F3)
BATTERY CHARGER (CH)
MACHINE START-UP
ENABLING
PUSH-BUTTON (SW2)
SOLUTION FLOW
SWITCH (SW3)
SOLENOID VALVE (EV)
P100806
Page 50
Component Locations
Solution System 50Service Manual – SC351
• Solution tank
• Filler plug
• Detergent valve
Solution tank
• Solenoid valve (EV)
• Detergent hose
Filler plug
Detergent valve
Detergent hose
Solenoid valve (EV)
P100807
Page 51
Component Locations (Continues)
• Solenoid valve timer relay (KT1)
Solenoid valve timer
relay (KT1)
Solution System 51Service Manual – SC351
P200067
Page 52
Troubleshooting
Trouble Possible Causes Remedy
Solution System 52Service Manual – SC351
Small amount of solution or no solution
reaches the brush
The solution leaks when the machine is
off
The valve between tank and solution hose is clogged/dirty Clean
The solenoid valve (EV) is faulty or the electrical
connection is open
There is dust/debris in the tank or in the detergent hoses,
obstructing the solution ow
The function selector fuse (F3) is open Replace
The solenoid valve relay (KT1) is broken Replace
The program selection knob/rotary switch (SW1) is broken Replace
The levers or the machine start-up enabling push-button
(SW2) are broken
The solenoid valve (EV) is dirty/broken Clean/replace
Replace the solenoid valve or repair
the electrical connection
Clean the tank/hoses
Replace
Page 53
Removal and Installation
Solenoid Valve Disassembly/Assembly
Solution System 53Service Manual – SC351
Disassembly
1. Place the machine on a hoisting system (if
available), then lift it. Otherwise, drive the
machine on a level oor.
2. Make sure that the battery connector is
disconnected.
3. Remove the cover and the solution and recovery
water tanks.
4. Remove the solenoid valve power supply
connector (A).
5. Disconnect the hoses (B) and (C) under the
machine.
A
6. Remove the screws (D) and recover the washers.
7. Remove the solenoid valve (E) upwards.
Assembly
8. Assemble the components in the reverse order of
disassembly and note the following:
◦ When assembling the solenoid valve (E),
the stamped arrow (F) must be tuned in the
direction of the solution ow as shown in the
gure.
E
F
E
BD C
P100808
Page 54
Specications
Solution System 54Service Manual – SC351
Description
Solution tank capacity 2.9 USgal (11 litres)
Min/max solution ow
Resistance solenoid valve 16 Ohm
Advance
SC351
One drop: 0.066 gpm (0.25 litres/min)
Two drops: 0.13 gpm (0.5 litres/min)
Nilsk
SC351
Nilsk
SC351 full PKG
Page 55
Squeegee System 55Service Manual – SC351
Squeegee System
Functional Description
The squeegee system cleans the liquid off the oor, which is then collected by the recovery system.
The squeegee is fastened to the brush deck by 2 hooks and the vacuum hose.
When the machine is running, the conformation of the squeegee and the brush deck rotation mechanism, assist
in the alignment and accurate vacuuming of the water from the oor. The 2 blades have different hardness:
- Front blade; with ruled side to convey the water towards the centre of the squeegee.
- Rear blade; smooth, to collect the water and dry the oor.
All 4 functional edges of each blade can be used before replacing the blade itself.
The design and the central duct make it easy for the squeegee to clear the water.
Page 56
Component Locations
• Squeegee
• Rear blade
• Rear elastic strap
• Front blade
• Front strap
Squeegee
Rear blade
Squeegee System 56Service Manual – SC351
Rear elastic strap
Front blade
Front strap
P100809
Page 57
Maintenance and Adjustments
Squeegee Cleaning
Note: The squeegee must be clean
and its blades must be in
good conditions in order to
get a good drying.
Caution! It is advisable to wear
protective gloves when
cleaning the squeegee
because there may be
sharp debris.
Squeegee System 57Service Manual – SC351
5. Disengage the squeegee (B) from the deck.
6. Wash and clean the squeegee. In particular,
clean the compartments (C) and the vacuum
hole (D).
7. Check the front blade (F) and the rear blade
(G) for integrity, cuts and tears; if necessary
replace them (see the procedure in the following
paragraph).
1. Drive the machine on a level oor.
2. Check that the function selection knob is turned
to “0” and disconnect the battery connector.
3. Fully turn the brush/pad-holder deck counterclockwise.
4. Disconnect the vacuum hose (A) from the
squeegee.
8. Assemble the components in the reverse order of
disassembly.
F
A
C
D
C
E
B
P100810
Page 58
Squeegee Blade Check and Replacement
Squeegee System 58Service Manual – SC351
1. Clean the squeegee as shown in the previous
paragraph.
2. Check that the front blade (E) and the rear
blade (F) are integral and free from cuts and
lacerations; if necessary replace them. Check
that the front edge (G) of the rear blade is not
worn; otherwise, overturn the blade to replace
the worn edge with an integral one. If the other
edges are worn too, replace the blade as shown:
◦ Remove the fastening strap (H) by disengag-
ing it from the fasteners (I).
◦ Replace (or overturn) the rear blade (F), then
reinstall the fastening strap.
◦ Remove the fastening strap (J) by disengag-
ing it from the fasteners (K).
◦ Replace (or overturn) the front blade (E),
then reinstall the fastening strap.
3. Install the squeegee (B) by carefully inserting
the hooks (L) and the vacuum hole (M) in the
brush deck housings.
4. Connect the vacuum hose (A) to the squeegee.
D
I
F
A
J
K
J
C
L
M
B
H
D
E
C
G
EK
I
H
F
P100811
Page 59
Troubleshooting
Trouble Possible Causes Remedy
Leaving streaks on oor There is debris under the blade Remove
The squeegee blade edges are torn or worn Replace
Squeegee System 59Service Manual – SC351
Page 60
Wheel System, Non-Traction
Component Locations
• Rear wheels on xed axle
• Castors on brush deck
• Rear wheels on brush deck
Castors on brush deck
Wheel System, Non-Traction 60Service Manual – SC351
Rear wheels on brush
deck
Rear wheels on xed
axle
P100812
Page 61
Specications
Wheel System, Non-Traction 61Service Manual – SC351
Description
Diameter of wheels on xed axle 8.4 in (214 mm)
Wheel pressure on the oor 72.5 psi (0.5 N/mm
Advance
SC351
Nilsk
SC351
SC351 full PKG
2
)
Nilsk
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