Nilfisk-Advance Advance SC370 User manual

Service Manual-SC370 Contents 0
English
04/2023 (Rev.01) Form No. 55942489
SC370 43B
/17B 50000627 / 50000638
SC370 Service Manual

Service Manual-SC370 Contents 1
TABLE OF CONTENTS
English Service Manual .............................................................................................2-57
Français Manuel d'entretien....................................................................................58-113
Español Manual de servicio.................................................................................. 114-169
Deutsch Wartungshandbuch................................................................................ 170-225
Italiano Manuale di assistenza............................................................................226-281
Português Manual de manutenção..........................................................................282-337

Service Manual-SC370 Contents 2
Table of Contents
Table of Contents ......................................................................................................................................................2
03 General Information..............................................................................................................................................4
Machine General Description.................................................................................................................................4
Service Manual Purpose and Field of Application..................................................................................................4
Other Reference Manuals ......................................................................................................................................4
Conventions............................................................................................................................................................4
Service and Spare Parts..........................................................................................................................................5
Serial Number Label ...............................................................................................................................................5
Safety......................................................................................................................................................................6
General Safety Instructions....................................................................................................................................6
Machine Lifting.......................................................................................................................................................7
Transporting The Machine .....................................................................................................................................7
Technical Data ........................................................................................................................................................8
Maintenance Schedule...........................................................................................................................................9
Machine Structure............................................................................................................................................... 10
Machine Structure (continues)............................................................................................................................ 11
Service and Diagnostic Equipment...................................................................................................................... 12
Dimensions.......................................................................................................................................................... 12
04 Control System ................................................................................................................................................... 13
Functional Description......................................................................................................................................... 13
Component Locations.......................................................................................................................................... 16
Troubleshooting .................................................................................................................................................. 16
Control Panel Removal and Installation.............................................................................................................. 17
Specifications....................................................................................................................................................... 20
10 Chassis System.................................................................................................................................................... 23
Chassis (main parts)............................................................................................................................................. 23
24 Electrical System................................................................................................................................................. 24
Functional Description......................................................................................................................................... 24
Component Locations.......................................................................................................................................... 25
Maintenance and Adjustment............................................................................................................................. 26
Troubleshooting .................................................................................................................................................. 27

Service Manual-SC370 Contents 3
Removal and Installation..................................................................................................................................... 27
Specifications ........................................................................................................................................................ 29
Electrical Wiring Diagram.................................................................................................................................... 30
30 Solution System.................................................................................................................................................. 31
Functional Description......................................................................................................................................... 31
Component Locations.......................................................................................................................................... 32
Maintenance and Adjustment............................................................................................................................. 33
Troubleshooting .................................................................................................................................................. 33
Removal and Installation..................................................................................................................................... 34
Specifications....................................................................................................................................................... 35
34 Scrub System ...................................................................................................................................................... 36
Functional Description......................................................................................................................................... 36
Component Locations.......................................................................................................................................... 39
Troubleshooting .................................................................................................................................................. 40
Removal and Installation..................................................................................................................................... 41
Specifications....................................................................................................................................................... 44
38 Squeegee System................................................................................................................................................ 45
Functional Description......................................................................................................................................... 45
Component Locations.......................................................................................................................................... 46
Maintenance and Adjustment............................................................................................................................. 47
Troubleshooting .................................................................................................................................................. 48
Removal and Installation........................................................................................................................................ 49
Specifications....................................................................................................................................................... 50
40 Recovery System................................................................................................................................................. 51
Functional Description......................................................................................................................................... 51
Component Locations.......................................................................................................................................... 53
Maintenance and Adjustment............................................................................................................................. 54
Troubleshooting .................................................................................................................................................. 55
Removal and Installation..................................................................................................................................... 56
Specifications....................................................................................................................................................... 57

Service Manual- SC370 03 General Information 4
03 General Information
Machine General Description
The SC370 43B/17B is a walk-behind commercial floor scrubbing machine designed to wash and dry commercial
floors. The machine is powered by on-board batteries. The machine is equipped with a disc scrubbing pad, a
controlled solution system and a squeegee with blades behind the deck with vacuum suction. The machine also has
an on-board solution tank and wastewater recovery tank. This machine is not to be used outdoors, on carpets, or on
coarse floors.
Service Manual Purpose and Field of Application
This Service Manual is a technical resource intended to aid service personnel in maintaining and repairing the SC370
43B/17B to ensure optimum performance and long service life. Please read this manual carefully before performing any
maintenance and repair procedure on the machine.
Other Reference Manuals
Document name
Document number Document type
SC370 43B Instructions for Use
55942467
Instructions for Use
SC370 43B / 17B Parts List
55942486
Parts List
SC370 17B Instructions for Use
55942485
Instructions for Use
These manuals are available at:
–Local Advance or Local Nilfisk Retailer
–Nilfisk website: https:// www.nilfisk.com
–Advance website: www.advance-us.com
–Nilfisk website: www.nilfisk.com
Conventions
Front, rear, left or right are intended with reference to the operator’s position.

Service Manual- SC370 03 General Information 5
Service and Spare Parts
Serviceandrepairs mustbeperformedonlyby authorizedpersonnel or Advance/Nilfisk ServiceCenters.Theauthorized
personnel must be trained directly by the manufacturer and use original spare parts and accessories. Customers can
order spare parts according to the Model No. specified on the label.
(Apply Retailer label here)
Serial Number Label
The Model No. and Serial No. are shown on the nameplate on the machine. This information is needed when ordering
repair parts. Use the space below to write down the machine identification data.
MODEL NUMBER
SERIAL NUMBER

Service Manual- SC370 03 General Information 6
Safety
Symbols
It is important for you to read and understand this manual. The information it contains relates to protecting your
safety and preventing problems. The symbols below are used to help you recognize this information.
Warning: Indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury .
Caution: Indicates a potentially hazardous situation which, if not avoided, could result in
minor or moderate injury.
Caution: When used without the Safety Alert Symbol, indicates a potential situation which,
if not avoided, could result in property or machine damage.
Note: Indicates an important informational message.
General Safety Instructions
These safety instructions are included to warn you of potential bodily injury or property damage.
Caution! Read and understand all safety warnings and instructions. Failure to follow them may
result in electric shock, fire, and/or serious injury.
–To avoid personal injury, this machine should be used only by properly trained
and authorized persons.
–Do not operate the machine near toxic, dangerous, flammable and/or explosive
materials. This machine is not suitable for collecting dangerous or hazardous
materials.
–In case of fire, use a powder fire extinguisher, not a water-based extinguisher.
–Do not use on surfaces having a gradient exceeding that marked on the machine.
While on ramps or inclines, avoid sudden stops when loaded. Avoid abrupt sharp
turns.
–Disconnect the power source and/or batteries before servicing electrical components.
–Never work under a machine without safety blocks or stands to support the
machine.
–Do not dispense flammable cleaning agents, operate the machine on or near
these agents, or operate in areas where flammable liquids exist.
–When using floor cleaning detergents, follow all safety and handling instructions of their
respective manufacturer.
–Battery charging may produce highly explosive hydrogen gas. Charge the
batteries only in well-ventilated areas and away from ignition sources or open
flames.
–When operating this machine, ensure that third parties, particularly children, are
not endangered.
–Take precautions to prevent hair, jewelry, or loose clothing from being caught in
moving parts.
Property Damage Messages

Service Manual- SC370 03 General Information 7
Caution!
Before transporting the machine on an open truck or trailer, make sure that:
––
––
––
–All covers are closed
–The recovery tank and solution tank are empty
–Batteries (if equipped) are disconnected
–The machine is securely fastened in place on the transport.
–Storage and operation temperature must be above 0°C and humidity must be
between 30% and 95%, non-condensing.
–Before use, all doors and hoods should be properly latched.
–This machine is not approved for use on public paths or roads.
–This machine is only approved for use on hard surface.
–Use brushes and pads supplied with the machine or those specified in the User
Manual. Using other brushes or pads could reduce safety.
–Do not wash the machine with direct or pressurized water jets, or with corrosive
substances.
–Do not allow the brush/pad to operate while the machine is stationary to avoid
damaging the floor.
–Use only factory authorized parts and accessories.
–This machine must be properly disposed of in accordance with local laws and
regulations.
Machine Lifting
Caution! Never work under a machine without safety stands or blocks to support the
machine.
Transporting The Machine

Service Manual- SC370 03 General Information 8
Technical Data
Description
Units
Model
SC370 43B / SC370 17B
Rated power
W
905 W
Solution tank capacity
L/Gal
25 L / 6.6 Gal.
Recovery tank capacity
L/Gal
25 L / 6.6 Gal.
Machine length
mm/Inches
1020 mm / 40.1 Inches
Machine width with squeegee
mm/Inches
570 mm / 22.4 Inches
Machine width without squeegee
mm/Inches
485 mm / 19.1 Inches
Machine height (without handle)
mm/Inches
647 mm / 25.5 Inches
Machine height (with vertical
handle)
mm/Inches
1182 mm / 46.5 Inches
Working width
mm/Inches
432 mm / 17 Inches
Driving wheel diameter
mm/Inches
153 mm / 6 Inches
Rear wheel diameter
mm/Inches
89 mm / 3.5 Inches
Brush/pad diameter
mm/Inches
432 mm / 17 Inches
Brush/pad pressure (max)
Kg/Lbs.
19 Kg / 41.8 Lbs.
Solution flow (max) per setting
L/Gal per minute
(0.59/0.69/1.11/1.68) L
(0.16/0.18/0.29/0.44) Gal.
Sound pressure level
dB (A)
67 ± 3 dB (A)
Sound pressure level in ECO
mode or in silent mode
dB (A)
63 ± 3 dB (A)
Handle vibration level (max)
m/s2
< 2.5 m/s2
Climbing capacity (max)
% grade
2%
Min. aisle turn
cm/Inches
103 cm / 40.5 Inches
Vacuum motor power
W/H.P.
300 W / 0.4 H.P.
Vacuum capacity
mm/In of H2O
900 mm / 33±3 In of H2O
Vacuum capacity in ECO mode
or in silent mode
mm/In of H2O
650 mm / 25±3 In of H2O
Brush motor power
W/H.P.
400 W / 0.54 H.P.
Brush speed in normal mode
RPM
140 RPM
Brush speed in ECO mode
RPM
100 RPM
IP protection class
IP
IP24
Battery compartment size
(L x W x H)
mm/Inches
(265 x 350 x 230) mm / (10.4 x 13.8 x 9.1) Inches
Voltage
V
24 V DC
Batteries (*)
Ah
85Ah C20 / 67Ah C5
Battery run time
(standard batteries) (*)
Hour
Up to 4 hours
On-Board charger (*)
V/A
24V 10A
Productivity (max)
m2/h
1720 m2/h (18,514 sq. ft./h)
Machine weight with empty tanks
(without batteries)
Kg/Lbs.
58 Kg / 128 Lbs.
Gross vehicle weight (GVW)
Kg/Lbs.
134 Kg / 295 Lbs.
Shipping weight
Kg/Lbs.
137 Kg / 302 Lbs.
Packing dimensions (L xW x H)
mm/Inches
(1130 x 730 x 1040) mm / (44.5 x 28.7 x 41) Inches
(*): Optional

Service Manual- SC370 03 General Information 9
Maintenance Schedule
Warning! Maintenance procedures must be performed after the machine is turned off and the
battery charger cable is disconnected. In addition, read carefully the instructions in
the Safety chapter before performing any maintenance procedure.
Scheduled Maintenance Table
Procedure
Daily, after use
Weekly
Every 6
months
Annually
Battery charging
Squeegee cleaning
Brush/pad-holder cleaning
Tank cleaning
Tank sealing strip inspection
Float ball filter cleaning
Squeegee blade check or replacement
Solution filter cleaning
WET battery fluid level check
Fasteners tightness inspection
(1)
Brush motor carbon brush check or replacement
(2)
Vacuum motor carbon brush check or replacement
(2)
1.Also perform this inspection after the initial 10 hours of new machine usage.
2.Must be done by Service Center authorized by our company.

Service Manual- SC370 03 General Information 10
Machine Structure
1. Handlebar
2. Safety switch lever
3. Handlebar adjusting lever
4. Recovery water drain hose
5. Recovery tank lid
6. Fresh water cover
7. Cover retention chain
8. Filling hose neck
9. Recovery tank
10. Solution tank
11. Brush deck bumper wheel
12. Brush/pad-holder deck
13. Brush/pad-holder
14. Solution level hose
15. Solenoid valve
16. Solution filter
17. Front wheels
18. Squeegee knob
19. Squeegee lifting handle
20. Squeegee assembly
21. Control panel
22. Accessory parts box (*)
23. Battery charge cable holder
24. Battery charge cable
25. Security cover of charging jack
26. Charging signal lights
27. Deck lifting/lowering pedal
a) Pedal position when deck is lowered
b) Pedal position when deck is lifted
28. Caster wheel
29. Squeegee vacuum hose
30. Outlet cover
(*): Optional
3
7
5
6
2
1
8
9
10
11
12
13
21
23
24
25
26
28
27A
27B 29 30
4
22
Figure 1
14
16
17
15
1819
20

Service Manual- SC370 03 General Information 11
Machine Structure (continues)
Control Panel
31. Discharged battery warning light (red)
32. Semi-discharged battery warning light (yellow)
33. Charged battery warning light (green)
34. Flow increase switch
35. Solution flow indicator
36. Flow decrease switch
37. Brush/pad-holder release switch
38. Normal vacuum motor mode
39. One-button starting
40. ECO mode
41. Serial number plate/technical data
42. Charging red LED
43. Charging yellow LED
44. Charging green LED
45. Skirt (*)
46. Brush
47. Pad-holder (*)
(*): Optional
31 32 33
34
36
35
40
39
38 37
45
46 47
41
42
43
44

Service Manual- SC370 03 General Information 12
Service and Diagnostic Equipment
Besides a complete set of standard tools, the following instruments are necessary to perform quick check and
repairs on machines:
Digital Voltmeter (DVM)
Amp clamp with possibility of making DC measurements
Battery charge tester to check 12 V batteries
Dynamometric wrench set
A copy of the User Manual and Spare Parts List of the machine to be serviced
Dimensions
33 Inches
(835mm)
22.5 Inches
(570 mm)
40.2 Inches
(1020mm)

Service Manual- SC370 04 Control system 13
04 Control System
Functional Description
The machine utilizes a Dashboard (EB1) to turn on various machine functions and a Control board (EB2) to control
outputs. When Dashboard (EB1) receives inputs from operator, it activates various components and functions
accordingly.
Press the one-button start (S3) on Dashboard (EB1) to turn on/off the machine. And press the vacuum button (S2)
on Dashboard (EB1) to turn on/off the vacuum motor (M2). Press the vacuum button (S2) for 1 second to switch
between normal mode and silent mode. The control signal is transmitted to Control board (EB2) via port J1-6 (vacuum
PWM) to control the on/off/vacuum level of vacuum output.
When the machine is turned on, the brush motor (M1) and solenoid valve (EV1) are on standby. When the safety
switch is pressed, the control signal is transmitted to Control board (EB2) via port J1-5 (brush PWM) and J1-7 (Water)
to activate the output of brush motor and solenoid valve. Press the flow increase switch (S5) and flow decrease
switch (S6) on Dashboard (EB1) to select the solution flow level.
Press the ECO mode button (S1) on Dashboard (EB1) to make the brush motor (M1) and vacuum motor (M2) work
in ECO mode by lowering their voltage via PWM regulation. The control signal is transmitted to Control board (EB2)
via port J1-5 (Brush PWM) and J1-6 (Vacuum PWM) to control the output of brush motor and vacuum motor. And
press the brush release button (S4) on Dashboard (EB1) to control the Control board (EB2) to release the brush via
brush motor.
The Control board (EB2) provides +24V and B- power for Dashboard (EB1). And the Dashboard (EB1) controls the
main relay on Control board (EB2). When the battery polarity is connected reversely, the Control board (EB2) can’t
provide +24V for Dashboard (EB1), and will cut off the B+ power from main relay to the load.
The Dashboard (EB1) also shows battery capacity and error messages through the battery capacity LED indicators
and one-button start LED indicator.
Dashboard (EB1)
Control board (EB2)
Vacuum output
Brush output
Solenoid valve output
S1
S2
S3
S4
S5
S6

Service Manual- SC370 04 Control system 14
Dashboard (EB1) front side
Dashboard (EB1) back side
Control board (EB2) front side
Control board (EB2) back side
Main relay

Service Manual- SC370 04 Control system 15
Block Diagram

Service Manual- SC370 04 Control system 16
Component Locations
Safety switch lever
Handlebar adjusting lever
Battery capacity LED
One-button start
Flow adjustment button
Dashboard (EB1)
Control board (EB2)
Troubleshooting
Trouble
Possible causes
Remedy
One-button start LED indicator
flashes
Brush motor overload
Check brush motor or replace it
Vacuum motor overload
Check vacuum motor or replace it
Debris or wires/cords entangled in
the brush hub, slowing its rotation
Remove the brush and remove any
debris/wires/cords
3 battery capacity LED indicators
flash simultaneously
Battery voltage too high, >29.5V
Use batteries of 24V
Figure 1
Figure 2
Figure 3
Figure 4
Battery capacity LED
Control board (EB2)
One-button start
Handlebar adjusting lever
Safety switch lever
Flow adjustment button
Dashboard (EB1)

Service Manual- SC370 04 Control system 17
Control Panel Removal and Installation
Dashboard (EB1)
Removal
1. Push the machine to a level floor.
2. Ensure that the machine is off.
3. Ensure the recovery tank is empty.
4. Remove the recovery tank assembly (Figure 5).
5. Disconnect the battery connector connected to the machine (Figure 6).
6. Use cross screwdriver to remove 16 screws on the rear cover of the handlebar (Figure 7).
7. Remove the cover of the handlebar (Figure 8).
Disconnect the battery connector
Figure 5
Figure 6
Figure 7
Figure 8
Remove 16 screws
Remove the cover

Service Manual- SC370 04 Control system 18
8. Remove the safety switch lever assembly (Figure 9).
9. Remove 2 screws on the PCB fixing plate (Figure 10).
10. Take out the Dashboard (Figure 11).
11. Disconnect all harnesses and terminals connected to the Dashboard (Figure 12).
Installation
Assemble components in reverse order of disassembly.
Figure 9
Figure 10
Figure 11
Figure 12
Safety switch lever
Remove 2 screws
Disconnect the harnesses
Take out the Dashboard

Service Manual- SC370 04 Control system 19
Control Board (EB2)
Removal
1. Push the machine to a level floor.
2. Ensure that the machine is off.
3. Ensure the recovery tank is empty.
4. Remove the recovery tank assembly.
5. Disconnect the battery connector connected to the machine (Figure 6).
6. Remove 7 screws, take out the distribution box (Figure 13).
7. Remove 2 screws, then remove the cover of distribution box (Figure 14).
8. Disconnect all harnesses connected to the Control board (Figure 15).
9. Remove 4 screws fixing the Control board and take it out (Figure 16).
Installation
Assemble components in reverse order of disassembly.
Remove 2 screws
Figure 13
Figure 14
Figure 15
Figure 16
Disconnect the harnesses
Remove 4 screws
Remove 7 screws
Distribution box