SC250, Scrubtec 334, MA 30

SC250, Scrubtec 334, MA 30
Service Manual
Advance SC250, 9087381020
Nilfisk SC250, 9087380020
Nilfisk Scrubtec 334, 9087382020
Clarke MA 30, 9087383020
English
08-2016 - Revised 03-2017
Form No. 9100002116
Service Manual – SC250, Scrubtec 334, MA 30
02 - Contents
Contents
03 - General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Machine General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Service Manual Purpose and Field of Application . . . . . . . . . . . . . . . . . . . . . . 4
Other Reference Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Serial Number Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Visible Symbols on the Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Machine Transportation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Machine Nomenclature (know your machine) . . . . . . . . . . . . . . . . . . . . . . . 10
Service and Diagnostic Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Scheduled Maintenance Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
04 - Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Machine Controller (EB1) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Control Board (EB2) and Hand Presence Sensors (S1, S2) . . . . . . . . . . .
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Machine Controller (EB1) Connectors . . . . . . . . . . . . . . . . . . . . . .
Main Control Board (EB2) Connectors . . . . . . . . . . . . . . . . . . . . . . . . .
17
17
18
19
20
20
26
30
30
35
10 - Chassis System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Chassis (main parts) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
14 - Wheel System, Non Traction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
24 - Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
LED Operation on Main Control Board . . . . . . . . . . . . . . . . . . . . . . . . 41
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Maintenance and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Battery Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Battery Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Battery Charge Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Charging the Battery when Removed from the Machine . . . . . . . . . . . . . . . 46
Display on Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Battery LED behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
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Service Manual – SC250, Scrubtec 334, MA 30
02 - Contents
30 - Solution System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Maintenance and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Cleaning the Solution Tank and Filter . . . . . . . . . . . . . . . . . . . . . . . . . 54
Solution Dispenser Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Water Pump Voltage and Cleaning Check . . . . . . . . . . . . . . . . . . . . . . . 56
Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Solution Tank Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Water Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Water Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
34 - Scrub System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Maintenance and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Brush and Brush Compartment Cleaning . . . . . . . . . . . . . . . . . . . . . . . 66
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Brush Motor Amperage Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Driving Belt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Brush Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
38 - Squeegee System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Squeegee Bar Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vacuum Duct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
76
76
78
78
79
80
80
84
40 - Recovery System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recovery Tank and Cover Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Filter, Gaskets and Recovery Water Duct Cleaning . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vacuum System Motor Amperage Test . . . . . . . . . . . . . . . . . . . . . . . .
Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vacuum System Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
85
85
85
86
87
87
88
89
90
92
92
98
90 - Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
iii
03 - General Information
Service Manual – SC250, Scrubtec 334, MA 30
03 - General Information
Machine General Description
The SC250 Scrubtec 334 is an operator pushed industrial machine designed to wash and dry floors in one
pass. The machine is powered by one on-board battery. The machine is equipped with a cylindrical brush, a
controlled solution flow dosing system and a front/rear squeegee assembly with blades, which vacuums and
dries the floor.
Service Manual Purpose and Field of Application
This Service Manual is a technical resource intended to help service technicians when carrying out maintenance and repairs on the scrubber-dryer, 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
Model
Product Code
User Manual
Spare Parts List
Nilfisk SC250
9087380020
Nilfisk Scrubtec 334
9087382020
9100001614
9100001615
Advance SC250
9087381020
9100001616
9100001617
Clarke MA30 13 B
9087383020
9100001622
These manuals are available at:
• Local Advance, Nilfisk or Clarke retailer
• Advance website: www.advance-us.com
• Nilfisk website: www.nilfisk.com
• Clarke website: www.clarkeus.com
• EZ-Data application
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03 - General Information
Service Manual – SC250, Scrubtec 334, MA 30
Conventions
Forward, backward, front, rear, left or right are intended with reference to the operator’s position, that is to
say in driving position.
Serial Number Label
Reference to Figure 1
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 (Date code: A16, means January 2016).
This information is useful when requiring machine spare parts.
Figure 1
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Service Manual – SC250, Scrubtec 334, MA 30
03 - 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.
2%
Warning! Do not use the machine on slopes with a gradient exceeding the
specifications.
Symbols
Danger!
It indicates a dangerous situation with risk of death for the operator.
Warning!
It indicates a electrostatic sensitive components.
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.
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Service Manual – SC250, Scrubtec 334, MA 30
03 - General Information
General Instructions
Specific warnings and cautions to inform about potential damages to people and machine are shown below.
Danger!
•
•
•
•
Make sure to follow the safety precautions to avoid situations that may lead to
serious injuries.
Before performing any maintenance, repair, cleaning or replacement procedure disconnect the battery.
This machine must be used by properly trained operators only.
Do not wear jewels when working near electrical components.
Do not operate the machine near toxic, dangerous, flammable and/or explosive powders, liquids or vapors.
This machine is not suitable for collecting dangerous powders.
Danger! (For battery and battery charger).
•
• Read all safety warnings and all instructions. Failure to follow the warnings and instructions may result
in electrical shock, fire and/or serious injury.
Warning!
(For battery and battery charger).
• This machine is equipped with a lithium ion battery.
• Do not use any other type of batteries; only use the one supplied with the machine or its original spare
part.
• Before each used, check if it’s damaged.
• Do not soak in liquids.
• Under abusive conditions, liquid may be ejected from the battery; avoid contact. If contact accidentally
occurs, flush with water. If liquid contacts eyes, additionally seek medical help. Liquid ejected from the
battery may cause irritation or burns.
• Do not use a battery pack or appliance that is damaged or modified. Damaged or modified batteries may
exhibit unpredictable behavior resulting in fire, explosion or risk of injury.
• Do not expose a battery pack or appliance to fire or excessive temperature. Exposure to fire or temperature above 130 °C (256 °F) may cause explosion.
• Do not store, use or recharge in environments with a temperature higher than 45 °C.
• Do not recharge with temperatures lower than 0 °C.
• Due to the risk of short-circuit, do not store the battery with metal objects.
• If the battery is damaged, take it to a Service Centre.
• Before decommissioning the machine, remove the battery.
• Store the battery charger in a dry place.
• If the battery charger or the cable are wet, do not use it.
• Before using the battery charger, make sure that the frequency and voltage values, marked on the plate,
correspond to the mains voltage values.
• Do not use the battery charger in environments where there are flammable powders and/or explosive
materials.
• Do not handle the battery charger by its main cable.
• 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 charge the battery if the battery charger cable or the plug are damaged.
• Do not cover the battery charger.
• Always use the battery charger supplied with the machine or the original spare part. Any other battery
charger must have the same specifications indicated in the chapter Technical Characteristics and must
supply a Safety Extra Low Voltage (SELV).
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Service Manual – SC250, Scrubtec 334, MA 30
Caution!
03 - General Information
Make sure to follow the safety precautions to avoid situations that may lead to
serious injuries, damages to materials or equipments.
• Carefully read all the instructions before performing any maintenance/repair procedure.
• To reduce the risk of fire, 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. This machine must be used indoors 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 Instructions for Use 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 they 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 Nilfisk’s recommended accessories.
• Check the machine carefully before each use, always check that all the components have been properly
assembled 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.
• Do not use the machine on slopes.
• Do not use the machine on slopes with a gradient exceeding the specifications.
• 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.
• The machine working temperature must be between 0 °C and +40 °C.
• The machine storage temperature must be between 0 °C and +40 °C.
• The humidity must be between 30 % and 95 %.
• When using floor cleaning detergents, follow the instructions on the labels of the detergent bottles.
• To handle floor cleaning detergents, wear suitable gloves and protections.
• Do not use the machine as a means of transport.
• Do not allow the brush/pad to operate while the machine is stationary to avoid damaging the floor.
• In case of fire, use a powder fire 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
flow.
• Do not remove or modify the plates affixed 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.
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Service Manual – SC250, Scrubtec 334, MA 30
03 - General Information
• Use brushes and pads supplied with the machine or those specified 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 necessary, 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 (batteries,
etc.), which are subject to standards that require disposal in special centres (see Scrapping chapter).
Machine Transportation
Warning!
Before transporting the machine, make sure that:
All covers are closed.
The recovery tank and the detergent tank are empty.
The battery is disconnected.
The machine is securely fastened to the means of transport.
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03 - General Information
Service Manual – SC250, Scrubtec 334, MA 30
Machine Nomenclature (know your machine)
Function block
push-button,
free handlebar
inclination
Function block
push-button, front
squeegee lifted
Battery charging
symbol
Handlebar
inclination
adjustment lever
Front squeegee
lifting lever
Knobs with
operator
palm sensors
Knobs with
operator
palm sensors
Vacuum system
push-button
Figure 2
Start/stop
switch
Solution switch
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03 - General Information
Service Manual – SC250, Scrubtec 334, MA 30
Machine Nomenclature (Continues)
Handlebar with
control panel
Recovery tank
cover
Park pedal pressed: for
parking/movement
Tanks container
lifting handle
Tanks (solution and
recovery water)
container
Front wheels
Park pedal lifted: for
washing/drying
Figure 3
Brush floor pressure
regulation knob
Brush engagement/disengagement lever
Machine body/cleaning
deck
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03 - General Information
Service Manual – SC250, Scrubtec 334, MA 30
Machine Nomenclature (Continues)
Folded handlebar
Transport handle
Solution tank filler plug
Battery charger
tray
Battery
Brush drive belt
compartment
Battery and electronics
compartment cover
Socket for battery
charger
Rear pivoting
wheels
Squeegee bars
Cylindrical brush
Debris collection
tank
Figure 4
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03 - General Information
Service Manual – SC250, Scrubtec 334, MA 30
Service and Diagnostic Equipment
Besides a complete set of standard meters, the following instruments are necessary to perform fast checks and repairs on
Nilfisk-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 36V batteries
• Anti-static 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 Nilfisk websites).
The following equipment is also available at Nilfisk-Advance Centers:
• Vacuum water lift gauge, P/N 56205281
Figure 5
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Service Manual – SC250, Scrubtec 334, MA 30
03 - General Information
Technical Data
Description / Model
Advance SC250 / Clarke MA 30 /
Nilfisk SC250, Scrubtec 334
Solution tank capacity
1.6 US gal (6 liters)
Recovery tank capacity
1.6 US gal (6 liters)
Machine dimensions
Length
25 in (630 mm)
Width
17 in (425 mm)
Height
16 in (400 mm)
Cleaning width
Squeegee width
13.4 in (340 mm)
14 in (360 mm)
Rear rotating wheel diameter
3 in (75 mm)
Front wheel diameter
2 in (50 mm)
Cylindrical brush diameter
3 in (80 mm)
Brush pressure on the ground
Min/max solution flow
Sound pressure level at workstation (ISO 11201, ISO 4871, EN 60335-2-72) (LpA)
Machine sound power 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
Vacuum system motor power
Vacuum system capacity
Brush motor power
Brush rotation speed
Total power draw (EN 60335-2-72)
Max 26 lb (Max 12 Kg)
0.04 / 0.08 US gal/min (0.15 / 0.3 L/min)
66 dB(A) ± 3 dB(A)
83 dB(A)
< 98 in/s2 (< 2.5 m/s2)
2%
0.24 hp (180 W)
2.13 ft H2O (650 mm H2O)
0.24 hp (180 W)
1,000 rpm
8.5 A (0.3 kW)
IP protection class
X4
Protection class (electric)
III
Electrical system voltage
36Vdc
Standard battery
Battery charger output
Operating time (EN 60335-2-72)
Lithium Ion - 36Vdc 8Ah
42Vdc 1÷2A
40 min
Weight with empty tanks
55 lb (25 kg)
Gross vehicle weight (GVW)
71 lb (32 kg)
Shipping weight
66 lb (30 kg)
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03 - General Information
Service Manual – SC250, Scrubtec 334, MA 30
15.7 in (400 mm)
19.7 in (500 mm)
43.7 in (1.110 mm)
Dimensions
16.7 in (425 mm)
24.8 in (630 mm)
48.8 in (1240 mm)
29.5 in (750 mm)
Figure 6
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03 - General Information
Service Manual – SC250, Scrubtec 334, MA 30
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 particular working
conditions, which are to be defined by the person in charge of the maintenance.
For instructions on maintenance procedures, see the following chapters.
Scheduled Maintenance Table
Procedure
Battery charging
Squeegee bar cleaning
Brush Cleaning
Cleaning of the brush compartment and the debris collection grid
Recovery tank and solution tank rinsing
Cleaning of intake duct
Cleaning of the solution dispensers
Squeegee blades check
Detergent filter cleaning
Cleaning of the air filter and gaskets
Squeegee bar replacement
Daily, after using the
machine
Weekly
Every six
months
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
04 - Control System
Functional Description
The (electrical) functions of the machine are controlled
via the handlebar with the 3 buttons on the Main control board (EB2) and activation of the hand presence
sensors (S1 - S2) inside the grip handles (the position
of these is indicated by the corresponding icons).
The machine is turned on and off by pressing the on/
.
off push-button
When the machine is turned on, the scrub, solution
flow (at level 1) and vacuum functions are activated
automatically.
Brush rotation and the activation of the pump, however, also require the activation of at least 1 of the 2
hand presence sensors.
The vacuum function can be disabled and re-enabled
The solution flow can be increased with 2 levels
. The corresponding green LEDs provide the
operator with information on the status of the function.
The battery charge level is displayed using the 6 green
.
LEDs inside the battery symbol
Main machine
controller (EB1)
. The
via the vacuum system push-button
corresponding green LED provides the operator with
information on the status of the function.
Main control
board (EB2)
RH hand presence
sensor (S1)
LH hand presence
sensor (S2)
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Wiring Diagram
BATTERY+
Electronic board power supply + BUTTON.1
UI.8
Start button input BUTTON.2
UI.7
Power supply + EXT.1
UI.6
Power supply - EXT.2
UI.5
SPI MISO EXT.3
UI.3
SPI MOSI EXT.4
UI.2
SPI clock EXT.6
UI.1
SPI CS3 EXT.11
UI.4
MAIN MACHINE
CONTROLLER (EB1)
BATTERY-
Figure 1
MAIN CONTROL
BOARD (EB2)
R.2
RH HAND PRESENCE SENSOR (S1)
P1
LD1
P2
LD2
P3
LD3
R.1
LD4
L.2
LD7
LD5
LD8
LD6
LD9
R.3
L.3
L.1
LH HAND PRESENCE SENSOR (S2)
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Service Manual – SC250, Scrubtec 334, MA 30
Component Locations
• Main machine controller (EB1)
• Main control board (EB2)
04 - Control System
• RH hand presence sensor (S1)
• LH hand presence sensor (S2)
Main machine
controller (EB1)
Figure 2
Main control
board (EB2)
RH hand presence
sensor (S1)
Figure 3
LH hand presence
sensor (S2)
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
20
Removal and Installation
Main Machine Controller (EB1)
Warning!
Electrostatic sensitive device, observe precautions for handling.
Use the specific ESD gloves. The operator should not wear a sweater, fleece or
other wool or synthetic clothing when changing the PCB.
The wrist strap must be connected to an earth ground.
See the relevant instructions.
Figure 4
Removal
1. Remove the tank assembly from the machine.
2. Open the rear cover and remove the battery.
3. Remove the screw (A) and remove the controller protective cover (B).
A
B
Figure 5
04-Control System.indd 20
13/06/2017 11:21:18
Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Machine Controller (EB1) (continues)
4. Disconnect the connector for the water sensor wiring (C).
C
Figure 6
5. Disconnect the connector for the BMS electronic battery management wiring (D).
D
Figure 7
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Machine Controller (EB1) (continues)
6. Disconnect the connector for the handlebar wiring (E).
E
Figure 8
7. Disconnect the connector for the battery charger wiring (F).
F
Figure 9
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Machine Controller (EB1) (continues)
8. Disconnect the connector for the on button wiring (G).
G
Figure 10
9. Disconnect the water pump connections wiring (H).
H
Figure 11
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Machine Controller (EB1) (continues)
10. Disconnect the vacuum motor connections wiring (I).
- While you unscrew the connection fastening screws, use a pair of pliers to hold the connector on the
controller (when tighten the screw, use a tightening torque to a 0,4 Nm).
I
Figure 12
11. Disconnect the brush motor connections wiring (J).
- While you unscrew the connection fastening screws, use a pair of pliers to hold the connector on the
controller (when tighten the screw, use a tightening torque to a 0,4 Nm).
J
Figure 13
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Machine Controller (EB1) (continues)
12. Disconnect the power supply connections wiring (K).
- While you unscrew the connection fastening screws, use a pair of pliers to hold the connector on the
controller (when tighten the screw, use a tightening torque to a 0,4 Nm).
K
Figure 14
13. Remove the screws (L), then remove the main machine controller (when mounting, tighten the screws
with a tightening torque to a 0,8 Nm).
L
Figure 15
Installation
14. Assemble the components in the reverse order of disassembly.
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Control Board (EB2) and Hand Presence Sensors (S1, S2)
Main Control Board Removal
1. Open the rear cover and remove the battery.
2. Lower the handlebar and move it forwards by pressing the left lever.
3. Remove the 7 screws (A) and remove the lower cover (B).
B
A
A
A
A
Figure 16
4. Remove the 3 upper cover (D) fastening screws (C).
C
C
Figure 17
C
D
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Control Board (EB2) and Hand Presence Sensors (S1, S2) (continues)
5. Unscrew the screw (E) holding the main control board wiring (F).
E
F
Figure 18
6. Disconnect the main wiring (G) and the 2 connections for the hand presence sensors (H).
G
H
H
Figure 19
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Control Board (EB2) and Hand Presence Sensors (S1, S2) (continues)
7. Carefully remove the main control board (I), detaching it from its seat on the front cover (J).
I
J
Figure 20
Hand presence Sensors (S1, S2) Removal
8. Disconnect the 2 connections wiring (K) from the hand presence sensors (L).
L
K
L
K
Figure 21
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Control Board (EB2) and Hand Presence Sensors (S1, S2) (continues)
9. Carefully remove the sensors (L), detaching them from their seat on the grip handles (N).
N
N
L
L
Figure 22
Installation
10. Assemble the components in the reverse order of disassembly.
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Specifications
Main Machine Controller (EB1) Connectors
BATTERY: type FCI T702035100J0G (2 ways, screw type)
PIN
Description
El. board in/out
V ref.
I max.
Connected to
1
Vbatt +
In
36V
25A
BAT+
2
Vbatt -
In
0V
25A
BAT-
2
1
Figure 23
OUT1: type FCI T702035100J0G (2 ways, screw type)
PIN
Description
El. board in/out
V ref.
I max.
Connected to
1
Brush motor output +
Out
36V
20A
M1+
2
Brush motor output -
Out
0V
20A
M1-
2
1
Figure 24
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Machine Controller (EB1) Connectors (continues)
OUT2: type FCI T702035100J0G (2 ways, screw type)
PIN
Description
El. board in/out
V ref.
I max.
Connected to
1
Vacuum motor output +
Out
36V
20A
M2+
2
Vacuum motor output -
Out
0V
20A
M2-
2
1
Figure 25
OUT3: faston 6.3x0.8mm (2 ways, vertical)
PIN
Description
El. board in/out
V ref.
I max.
Connected to
1
Water pump output +
Out
24V
2A
PM+
2
Water pump output -
Out
0V
2A
PM-
2
Figure 26
1
31
Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Machine Controller (EB1) Connectors (continues)
CHARGE: JST B2P-VH(LF)(SN) (2 ways, vertical)
PIN
Description
El. board in/out
V ref.
I max.
Connected to
1
Battery charger input +
In
36V
2A
CH+
2
Battery charger input -
In
0V
2A
CH-
2
1
Figure 27
BATT: JST B5B-PH-K-S (5 ways, vertical)
PIN
Description
El. board in/out
V ref.
I max.
Connected to
1
Battery LED input - strobe
In
0-3.3V
<1A
BAT.A1
2
Battery LED input - clock
In
0-3.3V
<1A
BAT.B1
3
CAN-H (not used)
In-out
0-3.3V
<1A
BAT.C1
4
CAN-L (not used)
In-out
0-3.3V
<1A
BAT.C2
5
Battery LED input - data
In
0-3.3V
<1A
BAT.B2
1
2
3
4
5
Figure 28
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Machine Controller (EB1) Connectors (continues)
BUTTON: JST B2B-EH-A (LF)(SN) (2 ways, vertical)
PIN
Description
1
Power supply +
2
Power button input
El. board in/out
V ref.
I max.
Connected to
Out
36V
<1A
UI.J201.8
In
36V
<1A
UI.J201.7
1
2
Figure 29
EXT: LEOCO 3675P12VTA0 ( ) (12 ways, vertical)
PIN
Description
El. board in/out
V ref.
I max.
Connected to
1
Power supply +
Out
5V
<1A
UI.J201.6
2
Power supply -
Out
0V
<1A
UI.J201.5
3
SPI MISO
In-out
0-5V
<1A
UI.J201.3
4
SPI MOSI
In-out
0-5V
<1A
UI.J201.2
5
Power supply - (not used)
Out
0V
<1A
-
6
SPI clock
Out
0-5V
<1A
UI.J201.1
Power supply - (not used)
Out
0V
<1A
-
SPI CS3
Out
0-5V
<1A
UI.J201.4
7
8
9
10
11
12
Figure 30
12
11
10
9
8
7
6
5
4
3
2
1
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Machine Controller (EB1) Connectors (continues)
C: JST B3B-ZR(LF)(SN) (3 ways, vertical)
PIN
Description
El. board in/out
V ref.
I max.
Connected to
1
Water sensor supply -
Out
0V
<1A
S3.1
2
Water sensor supply +
Out
5V
<1A
S3.2
3
Water sensor input
In
0V
<1A
S3.3
1
Figure 31
2
3
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Control Board (EB2) Connectors
J201: JST S8B-PH-SM4-TB (8 ways, vertical)
PIN
Description
El. board in/out
V ref.
I max.
Connected to
1
SPI clock
In
0-5V
<1A
EXT.6
2
SPI MOSI
In-out
0-5V
<1A
EXT.4
3
SPI MISO
In-out
0-5V
<1A
EXT.3
4
SPI CS3
In
0-5V
<1A
EXT.11
5
Power supply -
In
0V
<1A
EXT.2
6
Power supply +
In
5V
<1A
EXT.1
7
Power button input
Out
36V
<1A
BUTTON.2
8
Power supply +
In
36V
<1A
BUTTON.1
1
2
Figure 32 - (main control board - back view)
3
4
5
6
7
8
35
Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Control Board (EB2) Connectors (continues)
LEFT: JST S3B-ZR-SM4A-TF (3 ways, side entry)
PIN
Description
El. board in/out
V ref.
I max.
Connected to
1
Left hand presence sensor supply -
Out
0V
<1A
S1.1
2
Left hand presence sensor supply +
Out
5V
<1A
S1.2
3
Left hand presence sensor input
In
0V
<1A
S1.3
1
2
3
Figure 33 - (main control board - back view)
RIGHT: JST S3B-ZR-SM4A-TF (3 ways, side entry)
PIN
Description
El. board in/out
V ref.
I max.
Connected to
1
Right hand presence sensor supply -
Out
0V
<1A
S2.1
2
Right hand presence sensor supply +
Out
5V
<1A
S2.2
3
Right hand presence sensor input
In
0V
<1A
S2.3
1
2
3
Figure 34 - (main control board - back view)
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Service Manual – SC250, Scrubtec 334, MA 30
04 - Control System
Main Control Board (EB2) Connectors (continues)
EB2 (UI) BUTTONS (on EB2 side A)
Type: 4 leg Dome 12mm Ø
Ref.
Description
P1
Power on/off button
P2
Vacuum system button
P3
Solution flow button
EB2 (UI) LEDS (on EB2 side A)
Type: Kingbright AM2520CGCK09 or equivalent
Ref.
Color
Description
LD1
Green
Battery level 1/6
LD2
Green
Battery level 2/6
LD3
Green
Battery level 3/6
LD4
Green
Battery level 4/6
LD5
Green
Battery level 5/6
LD6
Green
Battery level 6/6
LD7
Green
Vacuum function
LD8
Green
Solution flow 1
LD9
Green
Solution flow 2
LD6
LD9
LD5
LD4
LD3
LD2
LD1
LD7
LD8
P3
P2
P1
Figure 35 - (main control board - back view)
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Service Manual – SC250, Scrubtec 334, MA 30
10 - Chassis System
10 - Chassis System
Chassis (main parts)
Reference to Figure 1
• Plastic tank support chassis, solution system and recovery water system
• Metal handlebar support chassis
Metal handlebar support
chassis and battery housing
Plastic tank support chassis,
solution system and
recovery water system
Figure 1
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Service Manual – SC250, Scrubtec 334, MA 30
14 - Wheel System, Non Traction
14 - Wheel System, Non Traction
Functional Description
The wheels assembly is composed by a pair of pivoting rear wheels and a pair of front wheels.
The front axle is fitted with a pedal mechanism for moving and parking the machine with the brush and squeegee assembly lifted from the floor.
Component Locations
•
•
•
•
Pivoting rear wheels
Front wheels
Machine lifting front axis
Movement/parking - washing/drying pedal
Movement/parking washing/drying pedal
Front wheels
Machine lifting
front axis
Pivoting rear
wheels
Figure 1
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Service Manual – SC250, Scrubtec 334, MA 30
14 - Wheel System, Non Traction
Specifications
Description / Model
Advance SC250, Clarke MA 30
Nilfisk SC250, Scrubtec 334
Rear rotating wheel diameter
3 in (75 mm)
Front wheel diameter
2 in (50 mm)
Maximum gradient when working
2%
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Service Manual – SC250, Scrubtec 334, MA 30
24 - Electrical System
24 - Electrical System
Functional Description
The machine electrical system is composed of the following components:
• Lithium battery: the battery pack contains the
lithium cell protection system (Battery Management System) and provides power (36Vdc nominal
voltage) to the machine system only after an activation system is provided by the machine start
push-button located on the Main control board
(EB2). Voltage from the battery can therefore only
be directly measured at the battery connector during machine operation. The battery connector also
contains the signal outputs necessary to display
the battery charge level on the machine control
panel. Any error codes from the battery management system (BMS) are displayed exclusively via
the yellow and red LEDs on the battery, which can
be activated by pressing the push-button next to
the LEDs themselves.
• Main machine controller (EB1): it receives the
controls from the Main control board (EB2) and
provides power directly to all machine components
(motors, pump, solution sensor). It also receives
the battery charge level signals which are transmitted to the controller to be displayed.
• Main control board (EB2): this is fully responsible
for the user interface, as it contains all control
push-buttons and the indicator LEDs, and is connected to the 2 operator presence sensors on the
handlebars. All information from and for the user
is exchanged with the Main machine controller
(EB1) via I2C protocol.
LED Operation on Main Control Board
DISPLAY DURING DISCHARGE (machine operation)
Battery level (approximated ±5%)
LD1
LD2
LD3
LD4
LD5
LD6
>90%
On
On
On
On
On
On
75% - 90%
On
On
On
On
On
60% - 75%
On
On
On
On
45% - 60%
On
On
On
30% - 45%
On
On
15% - 30%
On
0% - 15%
Flash
DISPLAY DURING CHARGE (charger output connected to CHARGE.1,2)
Battery level (approximated ±5%)
LD1
0% - 15%
Flash
15% - 30%
On
30% - 45%
Flash
On
45% - 60%
Flash
Flash
On
60% - 75%
Flash
Flash
Flash
On
75% - 90%
Flash
Flash
Flash
Flash
On
>90%
Flash
Flash
Flash
Flash
Flash
Charge completed
LD2
LD3
LD4
LD5
LD6
On
On
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Service Manual – SC250, Scrubtec 334, MA 30
24 - Electrical System
Wiring Diagram
BATTERY+
36V
LITHIUM BATTERY +
CONTROL SYSTEM
(BAT + BMS)
C1.C2
C1.B2
C1.A1
C1.C1
C1.B1
MAIN MACHINE
CONTROLLER (EB1)
BATT.1 Battery LED input - flashing
BATT.2 Battery LED input - timed
BATT.5 Battery LED input - data
BATT.3 CAN-H (a1)
BATT.4 CAN-L ( )
CHARGE.1 Battery charger input
CHARGE.2 Battery charger input
BATTERY CHARGER (CH)
Figure 1
BATTERY-
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Service Manual – SC250, Scrubtec 334, MA 30
24 - Electrical System
Component Locations
•
•
•
•
Battery charger (CH)
Battery charger connection socket
Lithium battery (BAT)
Battery connector (C1)
Battery charger
connection socket
Lithium battery (BAT)
Battery charger (CH)
Figure 2
Battery charger
housing
Battery connector
Figure 3
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Service Manual – SC250, Scrubtec 334, MA 30
24 - Electrical System
Maintenance and Adjustments
Battery Installation
1. Remove the rear cover on the battery compartment.
2. Grasp the battery handle, then push it downwards to seat it in place.
Battery Charging
Caution!
Charge the battery when only one LED of the battery symbol is light. 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 to the appointed recharging area.
2. Ensure that the machine is off.
3. Connect the battery charger cable plug into the machine socket and the power supply cable plug into
a mains socket (the mains voltage and frequency must be compatible with the battery charger values
shown on the data plate).
Note:
When the battery charger is connected to the electrical mains, all machine functions are
automatically cut off.
4. During charging, one of the 6 LEDs of the battery icon will remain steadily lit to indicate the percentage
of charging performed, while the other LEDs (to the left of the LED which is lit steadily) will flash
sequentially.
5. When the 6th LED of the battery icon is lit steadily, battery charging is complete.
6. Disconnect the battery charger from the mains and from the machine socket.
7. Open the battery compartment cover and place the battery charger in its tray.
8. Close the rear cover on the battery compartment.
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Service Manual – SC250, Scrubtec 334, MA 30
24 - Electrical System
Battery Charge Level
1. The battery charge level can be viewed on the battery icon LEDs (5).
2. The battery charge percentage depends on the number of LEDs lit, as shown in the figure 11.
3. When the first left LED flashes (15%), the machine will only run for a few more minutes (this will
depend on the characteristics of the work to perform).
15%
Figure 4
30%
45%
60%
80%
100%
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Service Manual – SC250, Scrubtec 334, MA 30
24 - Electrical System
Charging the Battery when Removed from the Machine
1. Remove the battery from the machine.
2. Place the battery in the appointed recharging area.
3. Connect the battery charger cable plug (B) into the battery socket (A) and the power supply cable plug
into a mains socket (the mains voltage and frequency must be compatible with the battery charger
values shown on the data plate).
4. During charging, one of the 6 green LEDs on the battery (C) will remain steadily on to indicate the
percentage of charging performed, while the other LEDs (to the left of the LED which is on steadily) will
flash sequentially.
5. When the 6th LED is lit steadily, battery charging is complete.
6. Disconnect the battery charger from the mains and from the battery.
Note:
When the battery is not connected to the battery charger, you can see the battery charge
level by pressing the button (D) briefly. The number of green LEDs (C) turned on is
proportional to the battery charger level percentage.
A
B
D
Figure 5
C
46
Service Manual – SC250, Scrubtec 334, MA 30
24 - Electrical System
Display on Battery
Buon
1
2
2
33
44
5
5
6
6
Y
Y
R
R
Figure 6
The battery pack contains the above “Display”, which
consists of a Button to activate the display if not under charge or discharge, 6 green LED’s to indicate the
remaining capacity, a Yellow LED to give warnings
and a Red LED to show errors. The available battery
capacity is indicated by the first 6 LED’s as follows:
1st Green LED (Flashing)
< 15 %
1st Green LED (Solid)
≥ 15 %
2nd Green LED
≥ 30 %
3nd Green LED
≥ 45 %
4nd Green LED
≥ 60 %
5nd Green LED
≥ 75 %
6nd Green LED
≥ 90 %
The 6 green LED’s are “rolling” during charge and
static during discharge.
The Yellow LED and Red LED gives the following
information during charging:
• Yellow LED (Solid): High or low temperature
The battery pack temperature is high or low and the
charging time is prolonged, depending on the charger
type. Regular charging will start automatically when
the battery temperature is within the recommended
temperature range.
• Yellow LED (Flashing): No charging
The charger has been disconnected before the battery
pack was fully charged.
• Red LED (Flashing): No charging
The battery cell temperature is lower than 0°C (32°F)
or higher than +50°C (+122°F). Charging will start
automatically when the battery temperature is within
a chargeable temperature.
The Yellow LED and Red LED gives the following
information during discharging:
• Yellow LED (Flashing): Low capacity
A flashing Yellow LED together with a flashing Green
LED indicates that the capacity is low and that the
battery pack needs recharging.
A flashing Yellow LED without a flashing Green LED
indicates that the battery pack is empty and needs
recharging.
• Red LED (Fast flashing): No discharging
The battery temperature is lower than -20°C
(-4°F) or higher than +55°C (+131°F). (Wait until the
battery temperature is within operative temperature)
The Red LED will also give a fast flashing if the battery pack is overloaded. (Remove the overload)
Red LED (3 Fast flashes followed by pause)
The battery pack is defect and beyond repair and
should not be used anymore.
All LED’s will go off approx. 10 seconds after fully
charge has been detected in order to reduce the energy consumption. All the LED’s will also go off approx.
10 seconds after a “Button” activation or after deactivation of the application.
For more detail see table on the Battery LED behavior paragraph.
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Service Manual – SC250, Scrubtec 334, MA 30
24 - Electrical System
Troubleshooting
Trouble
Possible Causes
Remedy
The machine is not working
Battery (BAT) flat or connections faulty
Charge the battery or clean the
connections
Battery (BAT) broken
Check the battery no-load voltage
The battery charger (CH) is broken
Replace
The battery will not charge
Note:
Damage to the battery charger or its connections can prevent the machine from
operating properly.
Battery LED behavior
Scenario
Yellow
LED
Red
LED
Description
Consequence
Indication on the machine display
battery LEDs
Charging in High
temperature
ON
OFF
Indicates slow charge
above +40°C
None, only slower charging
than usual
No indication
Charging in Low
temperature
ON
OFF
Indicates slow charge
below +10°C
None, only slower charging
than usual
No indication
Charge
temperature too
high
OFF
200mS
On/Off
No charging above +50°C
(Relevant Green LED On)
Stop charging
1 solid Green LED, indicating actual
capacity.
Charge
temperature too
low
OFF
200mS
On/Off
No charging below 0°C
(Relevant Green LED On)
Stop charging
1 solid Green LED, indicating actual
capacity.
Charge current
too low
400mS
On/Off
OFF
Indicates that charger
is removed before fully
charged
None
1 solid Green LED, indicating actual
capacity. (10 sec.)
Charge current
too high
400mS
On/Off
400mS
Off/On
Indicates that the charge
current is too high
Stop charging
1 solid Green LED, indicating actual
capacity.
Charge current
overload
ON
200mS
On/Off
Indicates a charge
overcurrent (Inrush)
Stop charging
1 solid Green LED, indicating actual
capacity. (10 sec.)
Discharge
temperature too
high
OFF
200mS
On/Off
Indicates a discharge
temperature above 55°C
Stop machine functions
1 solid Green LED, indicating actual
capacity. (10 sec.)
Discharge
temperature too
low
OFF
200mS
On/Off
Indicates a discharge
temperature below -20°C
Stop machine functions
1 solid Green LED, indicating actual
capacity. (10 sec.)
Discharge
current too high
OFF
200mS
On/Off
Indicates a discharge
current above 25 Amp (5
seconds)
Stop machine functions
1 solid Green LED, indicating actual
capacity. (10 sec.)
Discharge
overload
OFF
200mS
On/Off
Indicates a discharge
current above 30 Amp
(400mS)
Stop machine functions
1 solid Green LED, indicating actual
capacity. (10 sec.)
Battery capacity
low warning
400mS
On/Off
OFF
Indicates capacity below
10% or cell below 3.2-V
None
1 flashing Green LED
Battery empty
400mS
On/Off
OFF
Indicates empty battery
pack
No machine functions
No indication
Mosfet
temperature too
high
400mS
On/Off
400mS
On/Off
Indicates that the Mosfets is Stop machine functions
too hot (>90%)
1 solid Green LED, indicating actual
capacity. (10 sec.)
OFF
Special
Indicates that the battery
pack should be replaced
1 solid Green LED, indicating actual
capacity. (10 sec.)
Battery pack
defect
Stop machine functions
48
Service Manual – SC250, Scrubtec 334, MA 30
24 - Electrical System
Specifications
Description / Model
Advance SC250, Clarke MA 30
Nilfisk SC250, Scrubtec 334
IP protection class
X4
Protection class (electric)
III
Electrical system voltage
36Vdc
Standard battery
Battery charger output
Operating time (EN 60335-2-72)
Lithium Ion - 36Vdc 8Ah
42Vdc 1÷2A
40 min
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Service Manual – SC250, Scrubtec 334, MA 30
24 - Electrical System
Wiring Diagram
BRUSH
MOTOR (M1)
BATTERY+
M1
LITHIUM BATTERY +
CONTROL SYSTEM
(BAT + BMS)
OUT1.- Brush motor output
VACUUM
MOTOR (M2)
OUT2.+ Vacuum system motor output
Main controller power supply + BUTTON.1
UI.8
Start button input BUTTON.2
UI.7
Power supply + EXT.1
UI.6
Power supply - EXT.2
UI.5
M2
36V
MAIN CONTROL
BOARD (EB2)
OUT1.+ Brush motor output
OUT2.- Vacuum system motor output
C1.C2
C1.B2
C1.A1
C1.C1
C1.B1
C.2
SPI MISO EXT.3
UI.3
SPI MOSI EXT.4
UI.2
SPI clock EXT.6
UI.1
SPI CS3 EXT.11
C.1
LD1
P3
LD7
LD8
UI.4
BATT.1 Battery LED input - flashing
BATT.2 Battery LED input - timed
BATT.5 Battery LED input - data
Water pump output OUT3.+
BATT.4 CAN-L ( )
PM
CHARGE.1 Battery charger input
CHARGE.2 Battery charger input
BATTERY-
Figure 6
Water pump output OUT3.-
R.3
LD3
R.1
LD4
L.2
LD5
LD6
L.3
C.3
BATTERY CHARGER (CH)
LD2
P2
MAIN MACHINE CONTROLLER (EB1)
BATT.3 CAN-H (a1)
RH KNOB SENSOR (S1)
P1
LD9
WATER
SENSOR (S3)
R.2
WATER
PUMP (PM)
L.1
LH KNOB SENSOR (S2)
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Service Manual – SC250, Scrubtec 334, MA 30
30 - Solution System
30 - Solution System
Functional Description
The solution system supplies detergent to the brush when cleaning the floor. The solution tank is also part
of the machine recovery tank. The solution flows from the tank to the valve before reaching the filter and the
water pump (PM), and then to the solution dispensers in the brush compartment area.
The system also includes a water sensor (S3) which warns the operator when the solution tank is empty via
the two washing push-button LEDs.
Solution flow levels 1 and 2 regulate the flow of solution to meet requirements.
If the water sensor (S3) does not detect water inside the hose within 10 seconds of the pump starting up, the
pump is stopped and the fault is indicated by the 2 solution flow LEDs (LD8, LD9) flashing alternately.
To re-activate the pump, just take both hands off the handlebars to deactivate the operator presence sensors
(S1, S2), then reactivate them.
The pump operates only with the following inputs/conditions:
• Brush function on
• At least one of the two handlebar sensors activated
• Sufficient battery charge level: at least one LED on flashing.
Water Flow
Flow rate set
Square pulse Ton (+24V)
Square pulse Toff
LD8
LD9
1 (default)
18ms
36ms
On
Off
2
10ms
18ms
On
On
0
0ms
-
Off
Off
Filter
Water pump (PM)
Solution tank
Solution dispensers
Hoses
Water
sensor (S3)
Tank valve
LD8
LH hand presence
sensor (S2)
LD9
RH hand presence
sensor (S1)
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Service Manual – SC250, Scrubtec 334, MA 30
30 - Solution System
Wiring Diagram
BATTERY+
MAIN MACHINE
CONTROLLER (EB1)
C.2
C.1
WATER
SENSOR (S3)
C.3
Water pump output OUT3.+
PM
Water pump output OUT3.BATTERY-
Figure 1
WATER
PUMP (PM)
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Service Manual – SC250, Scrubtec 334, MA 30
30 - Solution System
Component Locations
•
•
•
•
Solution tank assembly
Tank filler cap
Tank valve
Solution filter
•
•
•
•
Water Pump (PM)
Hoses
Water sensor (S3)
Solution dispenser to brush
Solution tank filler plug
Tank valve
Solution tank
assembly
Figure 2
Solution dispensers to
brush area
Tank filter
Water pump (PM)
Hoses
Figure 3
Water
sensor
(S3)
53
Service Manual – SC250, Scrubtec 334, MA 30
30 - Solution System
Maintenance and Adjustments
Cleaning the Solution Tank and Filter
1. Ensure that the machine is off.
2. Remove the tanks container from the machine body using the handle.
3. Lift the tank cover and remove the solution cap.
4. Rinse the tank out with water
5. Remove the rubber gasket (A), then remove the filter strainer (B).
6. Clean them carefully and reinstall (C).
B
A
C
Figure 4
54
Service Manual – SC250, Scrubtec 334, MA 30
30 - Solution System
Solution Dispenser Cleaning
1. Ensure that the machine is off.
2. Remove the tanks container from the machine body using the handle.
3. Lift the machine body to access the lower part of the cleaning deck.
4. Remove the cylindrical brush.
5. Disassemble the solution dispensers (A) and clean them with water and detergent, then rinse and
reassemble in the corresponding housings.
A
A
Figure 5
55
Service Manual – SC250, Scrubtec 334, MA 30
30 - Solution System
Troubleshooting
Trouble
Possible Causes
Remedy
The solution push-button LEDs flash
Solution tank empty
Fill the tank
Small amount of solution or no solution
reaches the brush
Solution dispensers clogged.
Clean the solution dispensers.
Solution filter clogged/dirty
Clean the filter
Water pump (PM) broken or electrical connection
interrupted
Replace the pump/repair the
electrical connection
Presence of debris in solution tank blocking the outlet
valve
Clean the tank and the valve
Main machine controller (EB1) faulty
Replace
Main control board (EB2) faulty
Replace
The solution reaches the brush also when Dirt or scale in water pump (PM), or else it is broken
the machine is off
Replace
Water Pump Voltage and Cleaning Check
Water Pump Voltage Check
1. Remove the tanks assembly from the machine.
2. Open the rear cover.
3. Unscrew the screw (A) and remove the function main machine controller protection cover (B).
A
B
Figure 6
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Service Manual – SC250, Scrubtec 334, MA 30
30 - Solution System
Water Pump Voltage and Cleaning Check (continues)
4. On the main machine controller , identify the two output water pump faston connections (C).
5. With a digital multimenter (D) set to AC input (E), verify that on the output water pump (C) is current
an alternating voltage of ~ 14 ÷ 16 V with activated water pump.
6. If the water pump output is without voltage, check in the order:
a. Water pump wiring.
b. Water pump efficiency (Clean/unlock or replace).
c. Main machine controller efficiency.
D
C
D
E
Figure 7
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Service Manual – SC250, Scrubtec 334, MA 30
30 - Solution System
Water Pump Voltage and Cleaning Check (continues)
Water Pump Cleaning/Unlocking
7. Blow in the Water pump duct (F) with the compressed air at 1 bar max. (for the Water pump removal
see the procedure in Water pump removal/installation paragraph),
Caution!
Blow with compressed air on the arrow direction as shown on the pump label.
8. Eventually instead dissambling the Water pump, blow the inlet on the solution filter compartment (G)
(use cloth to narrow the air flow).
F
G
Figure 8
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Service Manual – SC250, Scrubtec 334, MA 30
30 - Solution System
Removal and Installation
Solution Tank Valve
1. Remove the tank assembly from the machine.
2. Working at the workbench, rotate the tank assembly and
3. Remove the 2 screws (A), remove the valve (B) and retain the gasket (C) for reuse.
B
A
C
Figure 6
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Service Manual – SC250, Scrubtec 334, MA 30
30 - Solution System
Water Pump
Removal
1. Remove the tank assembly from the machine.
2. Open the rear cover and remove the battery.
3. Remove the 7 caps (A) and remove the 7 screws (B), then remove the upper cover from the machine body
(C).
A
C
A
B
B
B
A
B
B
A
A
A
A
B
B
Figure 7
4. Disconnect the connection (D) and remove the Water pump (E), retaining the brackets and hoses for
reuse.
F
E
D
Figure 8
Installation
5. Install the components by performing the removal procedure in reverse, ensuring you respect the flow
direction arrow (F) on the Water pump.
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Service Manual – SC250, Scrubtec 334, MA 30
30 - Solution System
Water Sensor
Removal
1. Remove the tank assembly from the machine.
2. Open the rear cover and remove the battery.
3. Remove upper cover from the machine body (A).
A
Figure 9
4. Remove the 2 screws (A) and lift the cover (B) off the sensor bracket.
5. Disconnect the connection (C) and remove the water sensor (D) from the bracket.
C
B
A
D
Figure 10
Installation
6. Assemble the components in the reverse order of disassembly.
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Service Manual – SC250, Scrubtec 334, MA 30
30 - Solution System
Specifications
Description / Model
Advance SC250 / Clarke MA 30 / Nilfisk
SC250, Scrubtec 334
Solution tank capacity
1.6 US gal (6 liters)
Min/max solution flow
0.04 / 0.08 US gal/min (0.15 / 0.3 L/min)
IP rating
Water pump technical data
IP54
Maximum back pressure
0.8 bar
Solution flow rate
21 L/h
Input power
Insulation class
Power consumption
18W
F
< 900mA
62
Service Manual – SC250, Scrubtec 334, MA 30
34 - Scrub System
34 - Scrub System
Functional Description
The scrub system is enabled when the machine is
turned on.
The cylindrical brush rotates in the direction of travel
machine.
The rotating scrub system cleans/washes the surface of the floor. The area where brushes suitable for
cleaning the particular type of floor are installed is
the main part of the scrub system.
When the brush is coupled to the drive hub, it is connected to the motor via a toothed belt inside the lefthand casing.
Brush rotation occurs only when the brush motor
(M1) is driven by the main machine controller after
the machine is started up.
The scrub system uses the solution to wash the floor.
The knob on the right-hand side of the machine body
regulates the pressure of the brush on the ground.
Turning it clockwise increases pressure (+), counterclockwise decreases it (-).
A perforated tank, positioned behind the brush, collects small and medium sized debris picked up by the
brush.
In the event of brush motor overload, a safety system
stops the brushes after about 25 seconds of continuous overload.
The overload is detected by the Main machine controller (EB1) by monitoring the current flow to the brush
motor. Operation of the brush motor overload protection system is indicated by all 6 battery LEDs flashing simultaneously on the main control board.
To start work again after a brush stop due to overload, turn the machine off and then on again.
To work properly, the brush motor (M1) needs the following:
• Brush function on
• At least one of the two handlebar sensors activated
• Sufficient battery charge level: at least one LED
on flashing.
The brush motor (M1) is stopped if it turn for 60 seconds (even if not continuously) during the water sensor (S3) is not sensing the solution presence.
To restore the brush motor turn or to reset the 60 seconds counter, switch off and on the machine.
Brush rotation
Cylindrical brush
Direction of travel
Debris collection
tank
Drive hub
Floor brush pressure
adjustment knob
Brush motor (M1)
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Service Manual – SC250, Scrubtec 334, MA 30
34 - Scrub System
Wiring Diagram
BATTERY+
BRUSH
MOTOR (M1)
OUT1.+ Brush motor output
M1
OUT1.- Brush motor output
MAIN MACHINE
CONTROLLER (EB1)
BATTERY-
Figure 1
64
Service Manual – SC250, Scrubtec 334, MA 30
Component Locations
•
•
•
•
Brush motor (M1)
Cylindrical brush
Drive hub
Driving belt
34 - Scrub System
• Casing
• Floor brush pressure adjustment knob
• Debris collection tank
Cylindrical brush
Drive hub
Debris collection tank
Brush motor (M1)
Figure 2
Driving belt
Floor brush pressure
adjustment knob
Figure 3
Casing
65
Service Manual – SC250, Scrubtec 334, MA 30
34 - Scrub System
Maintenance and Adjustments
Brush and Brush Compartment Cleaning
1. Ensure that the machine is off.
2. Remove the tanks container from the machine body using the handle.
3. Lift the machine body to access the lower part of the cleaning deck.
4. Turn the lever counter-clockwise (A) and remove the brush.
5. Clean and wash the cylindrical brush with water and detergent.
6. Check the brush bristles for integrity and wear; if necessary, replace the brush.
7. Carefully clean the brush compartment (B).
8. Remove the debris collection tank (C), clean it and rinse it with clean water, then put it back in its seat.
9. Reinstall the cylindrical brush on the drive hub (D) and engage it by turning the lever (E) clockwise.
E
A
B
D
C
Figure 4
66
Service Manual – SC250, Scrubtec 334, MA 30
34 - Scrub System
Troubleshooting
Trouble
Possible Causes
Remedy
The brush does not clean properly
The brush is excessively worn
Replace
The battery LEDs flash while working
Brush motor overload
Reduce the brush pressure on the
floor
There are foreign materials (tangled threads, etc.)
preventing the brush from rotating.
Clean the brush hub
The brush does not turn
Presence of bulky debris or string around the brush or
between the brush and attachment flange
Remove the brush and clean it
While running, the machine is noisy and
it vibrates
Deformed brush bristles
Wash the brush with hot water to
restore the bristles
Do not leave the machine parked
without the transport/parking wheels
The brush does not turn.
(The solution push-button LEDs
flash)
The solution flow is missing for more than 1 minute
Fill the solution tank, turn the
machine off and then
on
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Service Manual – SC250, Scrubtec 334, MA 30
34 - Scrub System
Brush Motor Amperage Check
Warning!
This procedure must be performed by qualified personnel only.
1. Open the rear cover on the battery compartment.
2. Remove the screw (A) and remove the controller protective cover (B).
A
B
Figure 5
68
Service Manual – SC250, Scrubtec 334, MA 30
34 - Scrub System
Brush Motor Amperage Test (continues)
3. Apply the amp clamp (C) to the electrical cable (D) of the brush motor.
4. Switch on the machine and operate it with one hand on the handlebar.
5. Check that the brush motor current draw is no more than 1 A at 36 V.
6. If the current draw is higher, check the belt tension or remove the brush motor (see the procedure in the
Vacuum System Motor Disassembly/Assembly paragraph), and check the condition of all its components
to detect and correct the reason for the abnormal current draw:
If the above-mentioned procedures do not produce the correct readings for the brush motor current
draw, the motor must be replaced.
D
C
Figure 6
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Service Manual – SC250, Scrubtec 334, MA 30
34 - Scrub System
Removal and Installation
Driving Belt
Check
1. Remove the tank assembly from the machine.
2. Open the rear cover and remove the battery.
3. Remove the cylindrical brush.
4. Remove the 4 screws (A) and remove the
protective casing on the transmission (B).
5. Visually inspect the entire length of the belt (C)
to make sure it is intact and shows no signs of
cuts, tears or cracks; replace if necessary.
6. Check the tension of the belt (C) between motor
and brush using the TEN-SIT (D) device: When
deflecting the centre of the belt (E), the tool
should measure a value of 69Hz ±10.
Belt tensioning
If necessary, tension the belt correctly (C).
7. Loosen the 3 screws (F) and adjust the position
of the motor and pulley (G) as necessary. Once
the correct tension of the belt has been applied,
tighten the 3 screws (F).
A
B
E
C
A
A
A
D
Figure 7
F
C
F
G
G
F
F
F
Figure 8
F
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Service Manual – SC250, Scrubtec 334, MA 30
34 - Scrub System
Driving Belt (continues)
Replacement
8. If the belt (C) requires replacement, loosen the 3 screws (F) and move the brush motor and pulley (G) to
loosen the belt, then replace it.
9. Tension the belt (see the procedure given above).
F
F
C
G
G
F
F
Figure 9
Reassembly
10. Perform steps 1 to 4 in the reverse order.
F
F
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Service Manual – SC250, Scrubtec 334, MA 30
34 - Scrub System
Brush Motor
Removal
1. Remove the tank assembly from the machine.
2. Open the rear cover and remove the battery.
3. Remove the cylindrical brush.
4. Remove the screw to remove the controller protective cover.
5. Disconnect the brush motor connections (A).
- Do not loosen the connection fastening screws, use a pair of pliers to hold the connector on the
controller .
A
Figure 10
6. Remove the two cable retention clamps (B).
B
B
Figure 11
72
Service Manual – SC250, Scrubtec 334, MA 30
34 - Scrub System
Brush Motor (continues)
7. Remove the 7 caps (C) and remove the 7 screws (D), then remove the upper cover from the machine body
(E).
C
D
E
C
D
D
C
D
D
C
C
C
C
D
D
Figure 12
8. Remove the screw (F), keeping the inner locknut (G) held in position. Remove the 2 screws (H), keeping
the inner locknuts (I) held in position.
G
H
H
F
I
I
Figure 13
9. Working underneath the machine, remove the clamp (J) and extract the wiring. Remove the motor and
transmission assembly (K) from the machine.
K
J
Figure 14
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Service Manual – SC250, Scrubtec 334, MA 30
34 - Scrub System
Brush Motor (continues)
10. Working at the workbench, remove the 4 screws (L), then remove the brush motor (M) from its support.
L
L
L
L
M
Figure 15
Installation
11. Fit the brush motor on its support and tension the belt.
12. During assembly on the machine, position the brush motor and keep it rotated as shown (N), then screw
in and tighten the 3 screws (O) with the locknuts.
O
O
O
N
N
Figure 16
13. Assemble the components in the reverse order of disassembly. Ensure the brush motor power supply
cable polarity is correct on the connection to the main machine controller .
74
Service Manual – SC250, Scrubtec 334, MA 30
34 - Scrub System
Specifications
Advance SC250, Clarke MA 30
Nilfisk SC250, Scrubtec 334
Description / Model
Cleaning width
13.4 in (340 mm)
Cylindrical brush diameter
3 in (80 mm)
Brush pressure on the ground
Brush motor technical data
Max 26 lb (Max 12 Kg)
Power
0.24 hp (180 W)
Nominal speed
2000 ± 140 rpm
Nominal current draw
7 ± 0.7 A
Nominal torque
0.88 Nm
No-load current
0.5 ± 0.3 A
No-load speed
2450 ± 172 rpm
Insulation class
B
IP rating
Conductor and insulation materials
Brush rotation speed
IP20
UL certified
1,000 rpm
75
Service Manual – SC250, Scrubtec 334, MA 30
38 - Squeegee System
38 - Squeegee System
Functional Description
The squeegee system cleans the liquid off the floor, which is then collected by the recovery system.
The squeegee assembly (A) is attached to the machine body via two quick fix brackets fitted with springs,
which allow the squeegees to adhere to and apply the correct pressure to the floor, even if it is not perfectly
smooth and level.
Operating the right-hand lever on the handlebar lifts the front squeegee, allowing larger debris to be picked
up. The mechanism also stops vacuuming at the lifted front squeegee (B), with a consequent increase in vacuuming at the rear squeegee.
A
A
B
B
Figura 1
76
Service Manual – SC250, Scrubtec 334, MA 30
38 - Squeegee System
Component Locations
•
•
•
•
•
Squeegee assembly
Quick coupling
Integrated brackets with return spring for floor pressure
Front right squeegee lifting lever
Mechanism for front squeegee lifting and vacuum system stop
Integrated brackets with
return spring for floor
pressure
Right lever
Squeegee assembly
Squeegee assembly
Figure 2
Mechanism for front squeegee
lifting and vacuum system
stop
77
Service Manual – SC250, Scrubtec 334, MA 30
38 - Squeegee System
Maintenance and Adjustments
Squeegee Bar Cleaning
Note:
The squeegee bars must be clean and the 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 bars because
there can be sharp debris.
Caution!
The squeegee bars are fastened to the machine with a snap system and can be
easily removed.
1. Ensure that the machine is off.
2. Remove the tanks container from the machine body using the handle.
3. Lift the machine body to access the lower part of the cleaning deck.
4. Remove the squeegee bars by pulling them outwards.
5. Clean and wash the squeegee bars. In particular, clean the compartments (A) and the vacuum hole (B).
Check the blades for integrity, cuts and tears; if necessary replace the squeegee bars.
6. Before installing the squeegee bars, clean the recovery water ducts (C) thoroughly.
7. Install the squeegee bars and make sure they are properly engaged.
A
B
A
B
Figure 3
C
78
Service Manual – SC250, Scrubtec 334, MA 30
38 - Squeegee System
Troubleshooting
Trouble
Possible Causes
Remedy
Dirty water vacuuming is insufficient or
there is no vacuuming.
The squeegee bars are dirty or the blades are worn or
damaged.
Clean and check the squeegee
bars.
The squeegees leave marks on the floor.
There is debris under the squeegee blades.
Remove the debris.
The squeegee blades are worn, chipped or torn.
Replace the blades.
Debris collection tank full.
Empty the tank.
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Service Manual – SC250, Scrubtec 334, MA 30
38 - Squeegee System
Removal and Installation
Vacuum Duct
Removal
1. Remove the tank assembly from the machine.
2. Open the rear cover and remove the battery.
3. Remove upper cover from the machine body (A).
A
Figure 4
4. Loosen the nut and locknut (B) and remove the squeegee lifting cable (C).
B
C
Figure 5
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Service Manual – SC250, Scrubtec 334, MA 30
38 - Squeegee System
Vacuum Duct (continues)
5. Unscrew the 4 screws (D) and lift the vacuum duct bracket (E).
D
D
D
E
D
Figure 6
6. Free the front hook (F) from the linkage (G), then remove the vacuum duct bracket (E).
7. Remove the vacuum duct (H) and check that the openings are free of dirt and debris.
E
G
H
F
Figure 7
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Service Manual – SC250, Scrubtec 334, MA 30
38 - Squeegee System
Vacuum Duct (continues)
Installation
8. Install the vacuum duct, making sure that the front (I) and rear openings (J) are correctly installed on
the chassis.
I
J
Figure 8
9. Fasten the front bar hook (K) to the squeegee lifting linkage (L), then fit the lifting cable (M),
reinstalling the closing nut and locknut (N).
N
L
K
Figure 9
M
82
Service Manual – SC250, Scrubtec 334, MA 30
38 - Squeegee System
Vacuum Duct (continues)
10. Adjust squeegee lifting: Press the lifting lever and stop it with the orange push-button
11. The minimum height of the lifting bar must be ≥ 0.7 in (≥ 18 mm) (O). Adjust with the nut and locknut
(N).
N
O
0.7 in (18 mm)
0.7 in (18 mm)
Figure 10
83
Service Manual – SC250, Scrubtec 334, MA 30
38 - Squeegee System
Specifications
Description / Model
Squeegee width
Advance SC250, Clarke MA 30
Nilfisk SC250, Scrubtec 334
14 in (360 mm)
84
Service Manual – SC250, Scrubtec 334, MA 30
40 - Recovery System
40 - Recovery System
Functional Description
The recovery water system removes the dirty water
from the floor and pipes it to a recovery tank. When
the machine is running, the dirty water on the floor is
collected by the squeegees assembly, and is directed
through the slots in the blades into the vacuum duct
and into the tank by the airflow created by vacuum
system motor (M2).
The recovery tank is also part of the solution tank.
The collected dirty water is piped through two sleeves
into the recovery tank, while the airflow continues to
the vacuum fan.
The automatic float in the vacuum grid on the cover
stops the vacuum system motor (M2) from collecting
any liquid.
When the automatic float closes and stops the vacuum
system, the vacuum system motor noise will increase
and the floor will not be dried.
The gasket on the input of the vacuum system motor
allows full functionality of the system, while the filter
built in the gasket prevents the passage of dirt and
debris.
The recovery water system is activated when the machine is switched on, and can be disabled or re-enabled by pressing the corresponding vacuum system
push-button
Wiring Diagram
VACUUM SYSTEM
MOTOR (M2)
BATTERY+
OUT2.+ Vacuum system motor output
M2
OUT2.- Vacuum system motor output
MAIN MACHINE
CONTROLLER (EB1)
BATTERY-
Figure 1
.
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Service Manual – SC250, Scrubtec 334, MA 30
Component Locations
• Recovery tank assembly
• Vacuum sleeve from squeegee
• Vacuum sleeve from grid with automatic shut-off
float
• Recovery tank cover
• Cover gasket
40 - Recovery System
•
•
•
•
Vacuum grid with automatic shut-off float
Vacuum system motor (M2)
Vacuum system motor gasket
Vacuum system motor filter
Vacuum system motor (M2)
Figure 2
Vacuum system
motor gasket and
filter
Recovery tank cover
Cover gasket
Vacuum grid with
automatic shut-off float
Vacuum sleeves
Recovery tank assembly
Figure 3
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Service Manual – SC250, Scrubtec 334, MA 30
40 - Recovery System
Maintenance and Adjustments
Recovery Tank and Cover Cleaning
1. Lift the tanks container from the machine body
using the handle, and take it to the designated
disposal area.
2. Drain the water from the tank.
3. Remove the cover (A) clean and wash the cover
and the vacuum grid with water and detergent
(B).
4. If necessary, remove the grid body (C) and float,
than clean with care and reinstall.
5. Check the recovery tank cover gasket (D) for
integrity.
Note:
6. If necessary, replace the gasket (D) by removing
it from its housing on the cover. When
assembling the new gasket, install the joint (E)
in the area shown in the figure.
7. Check the air duct gasket (F) conditions. If
necessary, replace the gasket.
8. Clean the tank compartment (G) with water and
detergent, then rinse carefully.
9. Check that the seating surface (H) of the gasket
(D) is clean and adequate for the gasket itself.
10. Reassemble the components.
The gasket (D) creates the
vacuum in the tank that is
necessary to vacuum up the
recovery water.
D
E
C
F
B
H
A
G
Figure 4
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Service Manual – SC250, Scrubtec 334, MA 30
40 - Recovery System
Air Filter, Gaskets and Recovery Water Duct Cleaning
1. Remove the tanks container from the machine body using the handle.
2. Remove the air filter (A) and clean it.
3. Refit the filter in the housing of the gasket (B).
Note:
The gaskets (B) and (C) allow the creation of the vacuum in the system which is
necessary to collect the recovery water.
4. Check and clean the gasket (B) of the vacuum system motor.
5. Check and clean the recovery water duct gasket (C).
A
C
Figure 5
B
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Service Manual – SC250, Scrubtec 334, MA 30
40 - Recovery System
Troubleshooting
Trouble
Possible Causes
The vacuum system motor will not turn on Wiring between Main machine controller (EB1) and
vacuum system motor (M2) damaged
Dirty water vacuuming is insufficient or
there is no vacuuming.
Remedy
Repair
Main control board (EB2) faulty
Replace
Vacuum system motor faulty
Check the current draw/Replace
Activation of automatic float shut-off
Drain the recovery tank
Vacuum grid with automatic shut-off float dirty
Clean
Tank cover not correctly positioned
Adjust
Tank cover gasket damaged or not working correctly
Clean or replace
The recovery water duct is dirty
Clean the duct with running water
The vacuum system motor container is dirty
Clean
Vacuum seals damaged or not working correctly
Repair or replace
The air filter is dirty
Clean the filter
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Service Manual – SC250, Scrubtec 334, MA 30
40 - Recovery System
Vacuum System Motor Amperage Test
Warning!
This procedure must be performed by qualified personnel only.
1. Open the rear cover on the battery compartment.
2. Remove the screw (A) and remove the main machine controller protective cover (B).
A
B
Figure 6
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Service Manual – SC250, Scrubtec 334, MA 30
40 - Recovery System
Vacuum System Motor Amperage Test (continues)
3. Apply the amp clamp (C) to the electrical cable (D) of the vacuum system motor.
4. Switch on the machine and operate it with one hand on the handlebar.
5. Check that the vacuum system motor current draw is between 5.5 and 6.5 A at 36 V.
6. If the current draw is higher, remove the vacuum system motor (see the procedure in the Vacuum
System Motor Disassembly/Assembly paragraph), and check the condition of all its components to detect
and correct the reason for the abnormal current draw:
If the above-mentioned procedures do not produce the correct readings for the vacuum system motor
current draw, the motor must be replaced.
D
C
Figure 7
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Service Manual – SC250, Scrubtec 334, MA 30
40 - Recovery System
Removal and Installation
Vacuum System Motor
Removal
1. Remove the tank assembly from the machine.
2. Open the rear cover and remove the battery.
3. Remove the screw to remove the controller protective cover.
4. Disconnect the vacuum motor connections (A).
- Do not loosen the connection fastening screws, use a pair of pliers to hold the connector on the
controller.
A
Figure 8
5. Remove the two cable retention clamps (B).
B
B
Figure 9
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Service Manual – SC250, Scrubtec 334, MA 30
40 - Recovery System
Vacuum System Motor (continues)
6. Turn the machine over onto its right side to access the lower area.
7. Remove clamp (C) and clamp (D) to free up the wiring.
C
D
Figure 10
8. Remove the wiring (E) from the machine.
9. Unscrew the 4 retaining screws (F) and remove the vacuum motor unit (G) from the machine.
F
F
G
E
F
Figure 11
F
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Service Manual – SC250, Scrubtec 334, MA 30
40 - Recovery System
Vacuum System Motor (continues)
Disassembly
10. At the workbench, unscrew the 4 screws (H), then carefully rotate the vacuum system assembly.
11. Remove the clamp (I).
H
H
I
H
H
Figure 12
12. Lift the outer container (J) out of the inner container (K), then extract the motor (L).
L
K
Figure 13
J
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Service Manual – SC250, Scrubtec 334, MA 30
40 - Recovery System
Vacuum System Motor (continues)
13. Save the gaskets (M) and (N).
M
N
Figure 14
14. Remove the save the clamp (O) and the dividing sponge (P), then disconnect the connections (Q).
P
O
Q
Figure 15
15. Clean the inside of the containers to remove any dirt which has accumulated, and check all gaskets for
wear; replace if necessary.
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Service Manual – SC250, Scrubtec 334, MA 30
40 - Recovery System
Vacuum System Motor (continues)
Assembly
16. Position the gasket (M) on the vacuum system motor. Check that the gasket is reassembled with the
correct orientation (slots).
17. Install the clamp (R). The clamp must be positioned at 2.2 in (55 mm) from the upper surface, around
the entire circumference.
M
R
2.2 in (55 mm)
Figure 16
18. Connect the power connections (Q) and position the gasket (N) below the vacuum system motor. Check
that the gasket is reassembled with the correct orientation.
19. Position the sponge ring (P) flush against the clamp (R). Check that the wiring is inside the sponge ring
and that the sponge is correctly oriented.
20. Position the clamp (O) together with the wiring.
P
O
Q
N
Figure 17
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Service Manual – SC250, Scrubtec 334, MA 30
40 - Recovery System
Vacuum System Motor (continues)
21. Run the wiring (E) inside the large hole in the outer container (J).
22. Insert the vacuum system motor in the outer container, as shown (S).
J
S
E
Figure 18
23. Rotate the outer container with the vacuum system motor. Check that the motor and gasket are
positioned almost in line with the outer edge of the container.
24. Fit the inner container (K) and fasten it with the 4 screws.
K
Figure 19
Installation
25. Continue to assemble the components in the reverse order of disassembly.
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40 - Recovery System
Specifications
Advance SC250, Clarke MA 30
Nilfisk SC250, Scrubtec 334
Description / Model
Recovery tank capacity
1.6 US gal (6 liters)
Power
Vacuum system motor technical data
Maximum current
6 ±0.3 A
Maximum air flow
38 ±2 dm³/s
Vacuum with Ø16mm hole
Insulation class
Impeller side bearing
Conductor and insulation materials
Vacuum system capacity
0.24 hp (180 W)
5.05 ±0.35 kPa A
H
CW (chemically resistant seal)
UL certified
2.13 ft H2O (650 mm H2O)
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Service Manual – SC250, Scrubtec 334, MA 30
90 - Options
Description
BATTERY AND BATTERY CHARGER KIT
(All versions)
Battery
Battery charger
Power supply cables
Illustration
90 - Options
99
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