Clarke CR 28 Boost User manual

Operator’s Manual
Libro de Instrucciones
Manuel d’utilisation
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Français (49 - 72)
This book has important information for the use and safe operation of this machine. Failure to read this
book prior to operating or attempting any service or maintenance procedure to your Clarke machine
could result in injury to you or to other personnel; damage to the machine or to other property could
occur as well. You must have training in the operation of this machine before using it. If your operator(s)
cannot read this manual, have it explained fully before attempting to operate this machine.
All directions given in this book are as seen from the operator’s position at the rear of the machine.
Form No. 9097861000 - 01/2011

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Operator’s Manual - CR 28 BOOST® 1
TABLE OF CONTENTS
INTRODUCTION.............................................................................................................................................2
MANUAL PURPOSE AND CONTENTS..........................................................................................................................................2
TARGET...........................................................................................................................................................................................2
HOW TO KEEP THIS MANUAL.......................................................................................................................................................2
IDENTIFICATION DATA...................................................................................................................................................................2
OTHER REFERENCE MANUALS...................................................................................................................................................2
SPARE PARTS AND MAINTENANCE.............................................................................................................................................2
CHANGES AND IMPROVEMENTS ................................................................................................................................................2
OPERATION CAPABILITIES...........................................................................................................................................................2
CONVENTIONS ..............................................................................................................................................................................2
UNPACKING/DELIVERY................................................................................................................................3
SAFETY ..........................................................................................................................................................3
SYMBOLS .......................................................................................................................................................................................3
GENERAL INSTRUCTIONS............................................................................................................................................................3
SYMBOLS SHOWN ON THE MACHINE.........................................................................................................................................5
MACHINE DESCRIPTION..............................................................................................................................6
MACHINE STRUCTURE.................................................................................................................................................................6
CONTROL PANEL...........................................................................................................................................................................7
VIEW UNDER TANK COVERS .......................................................................................................................................................8
VIEW UNDER TANK ASSEMBLY....................................................................................................................................................8
ACCESSORIES/OPTIONS.............................................................................................................................9
TECHNICAL DATA .........................................................................................................................................9
WIRING DIAGRAM........................................................................................................................................................................10
USE............................................................................................................................................................... 11
BATTERY CHECK/SETTING ON A NEW MACHINE.....................................................................................................................11
BATTERY INSTALLATION AND BATTERY TYPE SETTING (WET OR GEL)..............................................................................12
BEFORE START-UP......................................................................................................................................................................13
MACHINE STARTAND STOP.......................................................................................................................................................14
MACHINE OPERATION (SCRUBBING/DRYING).........................................................................................................................15
TANK EMPTYING..........................................................................................................................................................................16
AFTER USING THE MACHINE.....................................................................................................................................................16
PUSHING/TOWING THE MACHINE.............................................................................................................................................16
MACHINE LONG INACTIVITY......................................................................................................................................................17
FIRST PERIOD OF USE...............................................................................................................................................................17
MAINTENANCE............................................................................................................................................17
SCHEDULED MAINTENANCE TABLE .........................................................................................................................................17
MACHINE WORKING HOUR CHECK ..........................................................................................................................................17
SQUEEGEE CLEANING...............................................................................................................................................................18
SQUEEGEE BLADE CHECK AND REPLACEMENT....................................................................................................................18
BRUSH CLEANING.......................................................................................................................................................................19
CLEANING OF TANK AND VACUUM SCREEN WITH FLOAT.....................................................................................................19
SIDE SKIRT CHECK AND REPLACEMENT.................................................................................................................................20
VACUUM SYSTEM MOTOR FILTER CLEANING.........................................................................................................................21
SOLUTION FILTER CLEANING....................................................................................................................................................21
BATTERY CHARGING..................................................................................................................................................................22
FUSE CHECK/REPLACEMENT....................................................................................................................................................23
SAFETY FUNCTIONS ..................................................................................................................................23
EMERGENCY PUSH-BUTTON.....................................................................................................................................................23
SPEED REDUCTION AT BENDS.................................................................................................................................................. 23
DRIVER SEAT MICROSWITCH....................................................................................................................................................23
ELECTROMAGNETIC BRAKE......................................................................................................................................................23
TROUBLESHOOTING..................................................................................................................................24
SCRAPPING.................................................................................................................................................24
Parts List......................................................................................................................................................73

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2Operator’s Manual - CR 28 BOOST®
INTRODUCTION
NOTE
The numbers in brackets refer to the components shown in Machine Description chapter.
MANUAL PURPOSE AND CONTENTS
The purpose of this Manual is to provide the operator with all necessary information to use the machine properly in a safe and
autonomous way. It contains information about technical data, safety, operation, storage, maintenance, spare parts and disposal.
Before performing any procedure on the machine, the operators and qualified technicians must read this Manual carefully. Contact
Clarke in case of doubts concerning the interpretation of the instructions and for any further information.
TARGET
This Manual is intended for operators and technicians qualified to perform the machine maintenance.
The operators must not perform procedures reserved for qualified technicians. Clarke will not be answerable for damages coming
from the non-observance of this prohibition.
HOW TO KEEP THIS MANUAL
The Operator’s Manual must be kept near the machine, inside an adequate case, away from liquids and other substances that can
cause damage to it.
IDENTIFICATION DATA
The machine model and serial number are marked on the plate (30).
The machine production year is indicated by the first two figures of the machine serial number.
This information is useful when requiring machine spare parts. Use the following table to write down the machine identification data.
MACHINE model ...............................................................................
MACHINE serial number ...................................................................
OTHER REFERENCE MANUALS
Electronic battery charger Manual (to be considered as integral part of this Manual)–
Moreover, the following Manuals are available:
Service Manual (that can be consulted at any Clarke Service Center)– Spare Parts List (supplied with the machine)–
SPARE PARTS AND MAINTENANCE
All necessary operating, maintenance and repair procedures must be performed by qualified personnel or by Clarke Service
Centers. Only original spare parts and accessories must be used.
Call Clarke for service or to order spare parts and accessories, specifying the machine model and serial number.
CHANGES AND IMPROVEMENTS
Clarke constantly improves its products and reserves the right to make changes and improvements at its discretion without being
obliged to apply such benefits to the machines that were previously sold.
Any change and/or addition of accessory must be approved and performed by Clarke.
OPERATION CAPABILITIES
This scrubber-dryer is used to clean (scrubbing and drying) smooth and solid floors, in civil or industrial environment, under safe
operation conditions by a qualified operator.
The scrubber-dryer cannot be used for moquette and carpet cleaning.
CONVENTIONS
Forward, backward, front, rear, left or right are intended with reference to the operator’s position, that is to say on the driver’s seat
(25).

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Operator’s Manual - CR 28 BOOST® 3
UNPACKING/DELIVERY
To unpack the machine carefully follow the instructions on the packing.
Upon delivery carefully check that the machine and its packing have not been damaged during transportation. In case of visible
damages, keep the packing and have it checked by the carrier that delivered it. Call the carrier immediately to fill in a damage claim.
Check that the machine is equipped with the following features:
Technical documents:– Scrubber-dryer Operator’s Manual• Electronic battery charger Manual (integral part of this manual)• Scrubber-dryer Spare Parts List•
No. 2 lamellar fuses– No. 5 spacers for 6 V battery housing– One 2 mm-wrench for socket screws–
SAFETY
The following symbols indicate potentially dangerous situations. Always read this information carefully and take all necessary
precautions to safeguard people and property.
The operator’s cooperation is essential in order to prevent injury. No accident prevention program is effective without the total
cooperation of the person responsible for the machine operation. Most of the accidents that may occur in a factory, while working
or moving around, are caused by failure to comply with the simplest rules for exercising prudence. A careful and prudent operator is
the best guarantee against accidents and is essential for successful completion of any prevention program.
SYMBOLS
DANGER!
It indicates a dangerous situation with risk of death for the operator.
WARNING!
It indicates a potential risk of injury for people or damage to objects.
CAUTION!
It indicates a caution or a remark related to important or useful functions. Pay careful attention to the
paragraphs marked by this symbol.
NOTE
It indicates a remark related to important or useful functions.
CONSULTATION
It indicates the necessity to refer to the Operator’s Manual before performing any procedure.
GENERAL INSTRUCTIONS
Specific warnings and cautions to inform about potential damages to people and machine are shown below.
DANGER!
Before performing any maintenance, repair, cleaning or replacement procedure the battery connector must–be disconnected and the key must be removed from the ignition switch.
This machine must be used by properly trained operators only.–Keep the battery far from sparks, flames and incandescent material. During normal operation, explosive–gases are released.
Do not wear jewelry when working near electrical components.–Do not work under the lifted machine without supporting it with safety stands.–Do not operate the machine near toxic, dangerous, flammable and/or explosive powders, liquids or vapors.–This machine is not suitable for picking up hazardous materials.
Battery charging produces highly explosive hydrogen gas. Keep the tank assembly open during battery–charging and perform this procedure in well-ventilated areas and away from open flames.
WARNING!
Carefully read all the instructions before performing any maintenance/repair procedure.–Before using the battery charger, ensure that frequency and voltage values, indicated on the machine serial–number plate, match the electrical mains voltage.
To reduce the risk of fire, electric shock, or injury, do not leave the machine unattended when it is plugged–in. Unplug the machine from the electrical mains when not in use and before servicing.
Keep the battery charger cable away from heated surfaces.–

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4Operator’s Manual - CR 28 BOOST®
WARNING!
Do not allow to be used as a toy. Close attention is necessary when used near children.–Use only as shown in this Manual. Use only Clarke’s recommended accessories.–Do not use with damaged battery charger cable or plug. If the machine is not working as it should, has been–damaged, left outdoors or dropped into water, return it to the Service Center.
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.
Take all necessary precautions to prevent hair, jewelry and loose clothes from being caught by the machine–moving parts.
Do not smoke while charging the batteries.–Do not wash the machine with direct or pressurized water jets, or with corrosive substances.–To avoid any unauthorized use of the machine, remove the ignition key.–Do not leave the machine unattended without being sure that it cannot move independently.–Do not use the machine on incline.–Do not tilt the machine more than the angle indicated on the machine itself, in order to prevent instability.–Use only pads supplied with the machine and those specified in the Operator’s Manual. Using other–brushes or pads could reduce safety.
Before using the machine, close all doors and/or covers.–Do not use the machine in particularly dusty areas.–Use the machine only where a proper lighting is provided.–If the machine is to be used where there are other people besides the operator, it is necessary to install the–pivoting light and the reverse gear buzzer (optional).
While using this machine, take care not to cause damage to other people, especially children.–Do not put any can containing fluids on the machine, use the relevant can holder.–The machine storage temperature must be between +32°F and +104°F (0°C and +40°C).–The machine working temperature must be between +32°F and +104°F (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.–Always protect the machine against the sun, rain and bad weather, both under operation and inactivity–condition. Store the machine indoors, in a dry place. This machine must be used in dry conditions, it must
not be used or kept outdoors in wet conditions.
Do not use the machine as a means of transport.–Do not allow the brush to operate while the machine is stationary to avoid damaging the floor.–In case of fire, use a powder fire extinguisher, not a water one.–Do not bump into shelves or scaffoldings, especially where there is a risk of falling objects.–Do not tamper with the machine safety guards and follow the routine maintenance instructions
–scrupulously.
To move the machine by hand it is necessary to disengage the electromagnetic brake. After moving–the machine by hand, the electromagnetic brake must be engaged. Do not use the machine when the
electromagnetic brake is disengaged.
When the machine is to be pushed for service reasons (missing or discharged batteries, etc.), the speed–must not exceed 2.5 mph (4 km/h).
Do not remove or modify the plates affixed to the machine.–In case of machine malfunctions, ensure that these are not caused by a lack of maintenance. Otherwise,–request assistance from the authorized personnel or from an authorized Service Center.
If parts must be replaced, require ORIGINAL spare parts from an authorized 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 authorized personnel or by an authorized Service Center.
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.
This machine cannot be used on roads or public streets.–Pay attention during the machine transfers when temperature is below freezing point. The water in the–recovery tank or in the hoses could freeze and seriously damage the machine.
When lead (WET) batteries are installed on the machine, do not tilt the machine more than 30° from the–horizontal plane to prevent the highly corrosive acid from leaking out of the batteries. If the machine must
be tilted to perform any maintenance procedure, remove the batteries.
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 centers (see Scrapping chapter).

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Operator’s Manual - CR 28 BOOST® 5
SYMBOLS SHOWN ON THE MACHINE
WARNING!
Carefully read all instructions before performing any procedure on the machine.
WARNING!
Do not wash the machine with direct or pressurized water jets.

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6Operator’s Manual - CR 28 BOOST®
MACHINE DESCRIPTION
MACHINE STRUCTURE
Steering wheel inclination control lever1. Steering wheel2. Drive pedal3. BOOST4. ®deck
BOOST5. ®deck motor
Side skirts6. Battery charger cable housing7. Battery charger cable8. Solution filter9. Recovery water drain hose10. Squeegee vacuum hose11. Squeegee12. Bumper wheels13. Squeegee support wheels14. Squeegee mounting handwheels15.
Squeegee balance adjusting handwheel16. Front squeegee blade17. Rear squeegee blade18. Squeegee rear blade fastening hook19. Solution tank20. Recovery tank21. Recovery tank cover22. Flashing light (optional)23. Solution drain hose24. Seat25. Battery charger26. Electromagnetic brake27. Front steering, driving and braking wheel28. Electromagnetic brake unlocking screws29. Serial number plate/technical data30.
21
22
23
1
2
30
20
3
78
13
6
4
9
13
17
18
14
15
19
12
14
15
13
25
26
28 27 29 5 4 6 24 13
10
11
16
13
S311377A

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Operator’s Manual - CR 28 BOOST® 7
CONTROL PANEL
Control panel31. Emergency push-button32. Horn33. Scrub and vacuum activation button34. Extra pressure button35. Squeegee lifting/lowering and vacuum system on/off button36. Battery charge indicator37. Charged battery warning light (green)37a. Semi-discharged battery warning light (yellow)37b. Discharged battery warning light (red)37c. Hour counter and solution level display:38. When the machine is started, it displays for a few• seconds the number of working hours which have been
performed.
While using the machine, it displays the solution level• in the tank (measured in percentage terms, compared
with the full tank).
When the level is below 20%, the display starts• blinking.
The display could indicate “000 %” even if the tank• is not completely empty, allowing to complete the
cleaning procedures; in any case, please check the
actual solution flow to the brushes.
Forward/reverse gear switch39. Solution flow adjustment40. Flow increase button40a. Flow decrease button40b. Flow LEDs:40c. 0 LEDs on - The solution flow is closed.• 1 LED on - 0.29 gal/min (1.1 liters/min).• 2 LEDs on - 0.5 gal/min (1.9 liters/min).• 3 LEDs on - 0.74 gal/min (2.8 liters/min).•
Maximum speed adjuster (enabled only when the brushes41. are operating)
Ignition key42.
35
33
32
34
36
37 37c 37b 37a 38
39
40
40a
40c
40b
42
31
41
S311212A

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8Operator’s Manual - CR 28 BOOST®
VIEW UNDER TANK COVERS
Recovery tank cover51. Recovery tank cover gasket52. Recovery water vacuum duct53. Vacuum screen with automatic shut-off float54. Float55. Screen fasteners56. Solution inlet opening57. Solution tank cover/driver’s seat58. Cover support rod59. Recovery tank60. Solution tank61.
S311219A
VIEW UNDER TANK ASSEMBLY
Tank assembly71. Batteries72. Battery case73. Battery connector74. Battery caps75. Battery connection diagrams76. Vacuum system motor sound-deadening filter77.
S311220A

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Operator’s Manual - CR 28 BOOST® 9
ACCESSORIES/OPTIONS
In addition to the standard components, the machine can be equipped with the following accessories/options, according to the
machine specific use:
AGM batteries– Brushes of different materials– Flashing light– Hose filling– Silencer reverse alarm–
For further information concerning the above-mentioned optional accessories, contact an authorized Retailer.
TECHNICAL DATA
Description CR 28 BOOST®
Cleaning width 28 in (711 mm)
Squeegee width 34 in (864 mm)
Solution tank capacity 19.8 gal (75 liters)
Min/max solution flow 0/0.74 gal/min (0/2.8 liters/min)
Recovery tank capacity 19.8 gal (75 liters)
Rear wheel 11.8 in (300 mm)
Wheel specific pressure on the floor Front 116 psi (0.8 N/mm2) - Rear 145 psi (1.0 N/mm2)
Front steering, driving and braking wheel diameter 9.8 in (250 mm)
Vacuum system motor power 0.67 hp (500 W)
Drive system motor power 0.80 hp (600 W)
Drive speed (variable) From 0 to 3.7 mph (from 0 to 6 km/h)
Gradeability 16% (9°)
Sound pressure level at workstation (ISO 11201, ISO 4871) (LpA) 60.8 dB(A) ± 3 dB(A)
Machine sound pressure level (ISO 3744, ISO 4871) (LwA) 82.4 dB(A)
Vibration level at the operator’s arms (*) 9 - 29.5 in/s2(0.23 – 0.75 m/s2)
Vibration level at the operator’s body (*) < 47.2 in/s2(< 1.2 m/s2)
Battery compartment size 24 V battery box: 23.6 x 15.3 x 11.8 in (600 x 390 x 300 mm)
Four 6 V batteries:
Wet and maintenance free available
Vacuum system capacity 70.9 inH2O (1,800 mmH2O)
Machine height 49.2 in (1,250 mm)
Machine maximum length 57.1 in (1,450 mm)
Machine width without squeegee 26 in (658 mm)
Brush/pad width 28 in (711 mm)
Weight without batteries and with empty tanks 308 lbs (140 kg)
Maximum weight with batteries and full tanks 848.7/1036 lbs (385/470 Kg)
Brush/pad motor power 0.75 hp (560 W)
Brush/pad-holder speed 2200 rpm
Brush/pad-holder pressure with extra-pressure function turned off 66 lbs (30 Kg)
Brush/pad-holder pressure with extra-pressure function turned on 110 lbs (50 Kg)
Under normal working conditions, on a level asphalt surface.(*)

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10 Operator’s Manual - CR 28 BOOST®
WIRING DIAGRAM
Key
BAT 24 V batteries
BE Flashing light
BRK Electromagnetic brake
BZ1 Reverse gear warning buzzer/horn
C1 Battery connector
C2 Battery charger auxiliary connector
C3 Battery charger external vent auxiliary connector
CH Battery charger
CS BOOST®deck connector
CSC Deck sub-connector
EB1 Function electronic board
EB2 Drive system electronic board
EB3 Electronic board (under control panel)
EB3/2 Electronic board (under control panel) (optional)
EV1 Solenoid valve
F1 Function electronic board fuse
F2 Drive system electronic board fuse
F3 Low power circuit fuse
F4 Pump fuse (optional)
K1 Ignition switch
LD1 Drive system electronic board diagnostic LED
M1 Left brush motor
M2 Right brush motor (if equipped)
M3 Vacuum system motor
M4 BOOST®deck actuator
M5 Drive system motor
M6 Squeegee actuator
M7 Washing water pump (optional)
M8 Detergent pump (optional)
M9 Cooling fan
PR1 Washing water level sensor
RV1 Working speed potentiometer
RV2 Speed potentiometer (pedal)
SW0 Emergency push-button
SW1 Actuator position 0 micro-switch
SW2 Actuator position 1 micro-switch
SW3 Actuator position 2 micro-switch
SW4 Steering sensor
SW5 Driver’s seat microswitch
SW6 Reverse gear switch
Color code
BK Black
BU Blue
BN Brown
GN Green
GY Gray
OG Orange
PK Pink
RD Red
VT Violet
WH White
YE Yellow
S311379A

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Operator’s Manual - CR 28 BOOST® 11
USE
WARNING!
On some points of the machine there are some adhesive plates indicating:
DANGER–WARNING–CAUTION–CONSULTATION–
While reading this Manual, the operator must pay particular attention to the symbols shown on the identification plates.
Do not cover identification plates for any reason and immediately replace them if damaged.
BATTERY CHECK/SETTING ON A NEW MACHINE
WARNING!
The electric components of this machine can be seriously damaged if batteries are either installed or connected
improperly. The batteries must be installed by qualified personnel only. Set the function electronic board and the
battery charger according to the type of batteries installed (WET or GEL).
Check the batteries for damage before installation.
Disconnect the battery connector and the battery charger plug.
Handle the batteries with great care.
Install the battery terminal protection caps supplied with the machine.
The machine requires one of the followings:
4 6 V batteries, 250 Ah (WET ACID)– 4 6 V batteries, 255 Ah (MAINTENANCE FREE AGM)–
The machine can be supplied in one of the following modes:
Batteries (WET or GEL) already installed and charged
Open the covers (51 and 58) and check that the tanks (60 and 61) are empty, otherwise drain them through the drain hose (10)1. and the tap (24).
Close the covers (51 and 58).2. Carefully lift the tank assembly (71).3. Check that the batteries are connected to the machine with the connector (74).4. Carefully lower the tank assembly (71).5. Insert the ignition key (42) and turn it to “I”. If the green warning light (37a) turns on, the batteries are charged. If the yellow6. (37b) or red warning light (37c) turns on, the batteries must be charged (see the procedure in Maintenance chapter).

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12 Operator’s Manual - CR 28 BOOST®
BATTERY INSTALLATION AND BATTERY TYPE SETTING (WET OR GEL)
According to the type of batteries (WET or GEL), set the machine and electronic board of the battery charger as follows:
Machine setting
Turn the ignition key (42) to “I” and in the very first seconds of machine operation pay attention to the following:1. If the green warning light (37a) is flashing, the machine is set to GEL (compatible with AGM).• If the red warning light (37c) is flashing, the machine is set to WET.•
To change the settings, proceed as follows.2. Turn off the machine and turn the ignition key (42) to “0”.3. Press and hold the switch (36), then turn the ignition key (42) to “I”.4. Release the switch (36) at least 5 seconds after turning the machine on.5. Press again the switch (36) for a few seconds and check that the warning light of the required setting is flashing.6.
Battery charger setting
Remove the screws (A, Fig. 1) and the panel (B).7. Turn the selector (C) to WET or GEL according to the type of batteries installed.8. Install the panel (B), then tighten the screws (A).9.
Figure 1 S311218A
Battery installation
Open the covers (51 and 58) and check that the tanks (60 and 61) are empty, otherwise drain them through the drain hose (10)10. and the tap (24).
Close the covers (51 and 58).11. Carefully lift the tank assembly (71).12. Install the batteries and connect them according to the diagram (76).13.
Battery charging
Charge the batteries (see the procedure in Maintenance chapter).14.

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Operator’s Manual - CR 28 BOOST® 13
BEFORE START-UP
WARNING!
At every machine start-up, check that, between the deck (4 or 5) and the machine or between the squeegee
(12) and the machine, there is no foreign material which may prevent the deck and the squeegee from lifting.
This check is necessary because, if the machine has been turned off without lifting the BOOST®deck and the
squeegee, when turned on again, the deck and the squeegee lift automatically.
Brush installation/removal
The machine can be equipped with different brushes (88) according to the type of floor to be cleaned.1. For the installation/removal, proceed as follows.2. Insert the ignition key (42) and turn it to “I”.
WARNING!
Before pressing the switch (34), always check that, between the deck (4) and the machine, there is no foreign
material which may prevent the deck from lifting.
Lift the deck by pressing the switch (34).3. Turn the ignition key (42) to “0” and remove it.4. Install the brush (88) so that it engages the BOOST5. ®deck.
To remove the brush, perform steps 2 to 5 in the reverse order.6.
Types of brushes available
Pads
Size Description Part No.
14 x 28 Red (5 Pack) 997001
14 x 28 Black (5 Pack) 997000
14 x 28 White (5 Pack) 997002
14 x 28 Blue (5 Pack) 997006
14 x 28 Maroon (10 Pack) 997018
Brushes
Size Description Part No.
14 x 28 Poly Brush 30752A
14 x 28 Nylon Brush 30751A
14 x 28 Grit Brush 30753A
Brush application guide
Models POLYPROPYLENE NYLON CLEAN GRIT
General cleaning:
Concrete
Terrazzo floor
Ceramic tiles/quarrystones
Marble
Vinyl tiles
Rubber tiles

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14 Operator’s Manual - CR 28 BOOST®
Squeegee installation
Install the squeegee (12) and fasten it with the handwheels (15), then connect the suction hose (11) to the squeegee.7. With the handwheel (16), adjust the squeegee so that its rear blade (18) touches the floor along all its length and that the front8. blade (17) is slightly detached from the floor.
Solution tank filling
Open the cover (58).9. Fill the solution tank (61) with a solution suitable for the work to be performed.10. Do not fill the solution tank completely, leave few inches from the edge.
Always follow the dilution instructions on the label of the chemical product used to prepare the solution.
The solution temperature must not exceed +104°F (+40°C).
WARNING!
Use only low-foam and non-flammable detergents, intended for automatic scrubber applications.
Operator’s position adjustment
Using the lever (1), adjust the inclination of the steering wheel (2) to reach a comfortable position.11.
MACHINE START AND STOP
Starting the machine
Prepare the machine as shown in the previous paragraph.1. Turn the ignition key (42) to “I”, without pressing the drive pedal (3). Check if the green warning light (37a) turns on.2. If the yellow (37b) or red warning light (37c) turns on, turn the ignition key back to “0” and charge the batteries (see the
procedure in Maintenance chapter).
Drive the machine to the working area, by keeping the hands on the steering wheel and by pressing the pedal (3).3. The drive speed can be adjusted from zero to maximum speed according to the pressure on the pedal (3).
The forward/reverse gear can be selected with the switch (39) on the right side of the dashboard.4. NOTE
The driver’s seat (25) is equipped with a safety sensor, which allows the machine to be moved with the pedal (3) only
when the operator is on the driver’s seat.
NOTE
The machine is equipped with an anti-tilting safety system that reduces the speed when turning, irrespectively of the
pressure on the pedal.
The reduction of speed when turning is not a malfunction but a characteristic that improves the machine stability in every
condition.
Lower the BOOST5. ®deck and the squeegee by pressing the switch (34).
Press the solution flow adjusting switches (40) according to the type of cleaning to be performed.6. Start scrubbing, by turning the steering wheel (2) and by moving the machine forward by pressing the pedal (3).7. If necessary, adjust the working speed using the maximum speed adjuster (41). The adjuster is enabled only when the8. machine is operating (scrubbing and/or drying).
Stopping the machine
Release the pedal (3).9. It is not necessary to lock the machine during stopping or parking, because the electromagnetic brake (27) activates10. automatically when the drive pedal is not pressed.
Lift the BOOST11. ®deck and the squeegee by pressing the switch (34).

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Operator’s Manual - CR 28 BOOST® 15
MACHINE OPERATION (SCRUBBING/DRYING)
Start the machine as shown in the previous paragraph.1. If necessary, adjust the solution flow sent to the brushes by pressing the switches (40).2. NOTE
For correct scrubbing/drying of floors at the sides of the walls, Clarke suggests to go near the walls with the right side of
the machine as shown in figure 2.
B
A
Figure 2 P100160
Squeegee adjustment
If necessary, stop the machine and adjust the squeegee with the handwheel (16) so that the rear blade touches the floor along3. all its length.
WARNING!
To avoid any damage to the floor surface, turn off the BOOST®deck when the machine stops in one place,
especially when the extra pressure function is on.
Working with the BOOST®deck extra pressure function turned on
If the dirt on the floor proves to be particularly difficult to clean, it is possible to work with an extra pressure of the BOOST4. ®
deck on the floor by pressing the switch (35).
To return to normal pressure, press the switch (35) again.5. The switch (35) is enabled only when the deck (4) is lowered and the switch warning light (34) is on.
CAUTION!
In case of brush motor overload due to BOOST®deck excessive pressure or too aggressive floors/brushes, a
safety system stops the BOOST®deck after about one minute of continuous overload.
The overload is shown by the three warning lights (37a, 37b, 37c) flashing simultaneously.
If the overload takes place when cleaning with the extra pressure function activated, the system automatically
reduces the pressure on the brush by deactivating the extra pressure function. If the overload persists, the
BOOST®deck stops.
To start again after the BOOST®deck stop due to overload, stop the machine by turning the ignition key (42) to
“0”. Turn on the machine by turning the ignition key (42) to “I”.

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16 Operator’s Manual - CR 28 BOOST®
Battery discharge during operation
Until the green warning light (37a) stays on, the batteries allow the machine to work normally.6. When the green warning light (37a) turns off and first the yellow warning light (37b) and then the red warning light (37c) turn
on, the batteries must be charged.
When the yellow warning light (37b) turns on, the machine residual autonomy will last for a few minutes (depending on• battery type).
When the red warning light (37c) turns on the machine autonomy is over: after a few seconds the BOOST• ®deck
automatically stops and lifts. Only the machine vacuum and drive systems still operate, just to dry the wet floor and move
the machine to the charging area.
CAUTION!
Do not use the machine with discharged batteries, to avoid damaging the batteries and reducing the battery life.
NOTE
In case the machine drive system cannot be used to move the machine, see Pushing/Towing The Machine paragraph.
TANK EMPTYING
An automatic float shut-off system (54) stops the vacuum system when the recovery tank (60) is full.
The vacuum system deactivation is signaled by a sudden increase in the vacuum system motor noise frequency, also the floor has
not dried.
WARNING!
If the vacuum system turns off accidentally (for example, when the float is activated because of a sudden
machine movement), to resume the operation: turn off the vacuum system by pressing the switch (36), then
open the cover (22) and check that the float inside the screen (55) has gone down to the water level. Then close
the cover (22) and turn on the vacuum system by pressing the switch (36).
When the recovery tank (60) is full, empty it as shown below.
Recovery tank emptying
Stop the machine by releasing the pedal (3).1. Lift the BOOST2. ®deck and the squeegee by pressing the switch (34).
Drive the machine to the appointed disposal area.3. Empty the recovery tank with the hose (10). Then, rinse the tank with clean water.4.
Solution Tank Emptying
Perform steps 1 to 3.5. Empty the solution tank by means of the tap (24). Then, rinse the tank with clean water.6.
AFTER USING THE MACHINE
After working, before leaving the machine:
Remove the brush as shown in the relevant paragraph.1. Empty the tanks (60 and 61) as shown in the previous paragraph.2. Perform the daily maintenance procedures (see the Maintenance chapter).3. Store the machine in a clean and dry place, with the brush and the squeegee lifted or removed.4.
PUSHING/TOWING THE MACHINE
To push/tow the machine easily when the drive system cannot be used, disengage the electromagnetic brake (27) by fully tightening
the screws (29) (turn them clockwise) with the supplied wrench.
When pushing/towing procedure is over, loosen the screws (29) by 3 turns approximately, to engage the electromagnetic brake (27).
WARNING!
If the screws (29) are not loosened as shown, the electromagnetic brake is deactivated.
WARNING!
Do not turn on the machine if the electromagnetic brake unlocking screws (29) are tightened (electromagnetic
brake deactivated).
For safety purposes, it is advisable to tighten the screws (29) only for the time necessary to move the machine
by hand.

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Operator’s Manual - CR 28 BOOST® 17
MACHINE LONG INACTIVITY
If the machine is not going to be used for more than 30 days, proceed as follows:1. Perform the procedures shown in After Using the Machine paragraph.2. Before disconnecting the battery red connector (74) perform the following procedures:3. Open the covers (51 and 58) and check that the tanks (60 and 61) are empty, otherwise drain them through the drain hose• (10) and the tap (24).
Close the covers (51 and 58).• Carefully lift the tank assembly (71).•
FIRST PERIOD OF USE
After the first 8 hours, check the machine fastening and connecting parts for proper tightening. Check the visible parts for integrity
and leakage.
MAINTENANCE
The lifespan of the machine and its maximum operating safety are ensured by correct and regular maintenance.
The following chart 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.
WARNING!
The procedures must be performed with the machine off and the batteries disconnected.
Moreover, carefully read all the instructions in the Safety paragraph.
All scheduled or extraordinary maintenance procedures must be performed by qualified personnel, or by an authorized Service
Center.
This Manual describes only the easiest and most common maintenance procedures.
NOTE
For other maintenance procedures contained in the Scheduled Maintenance Table or for extraordinary maintenance
procedures see the specific Service Manual that can be consulted at any Service Center.
SCHEDULED MAINTENANCE TABLE
Procedure Daily, after using
the machine Weekly Every six months Yearly
Squeegee cleaning
Brush cleaning
Cleaning of Tank and Vacuum screen and Float
Battery charging
Squeegee blade check and replacement
Side skirt check
Solution filter cleaning
Battery (WET) fluid level check
Screw and nut tightening check (1)
Squeegee cable sliding shoe lubrication (2)
Electromagnetic brake efficiency check (2)
BOOST®deck motor carbon brush check or replacement (2)
Vacuum system motor carbon brush check or replacement (2)
Drive system motor carbon brush check or replacement (2)
And after the first 8 working hours.(1) This maintenance procedure must be performed by Clarke authorized Service Center.(2)
MACHINE WORKING HOUR CHECK
Insert the ignition key (42) and turn it to “I”.1. In the first 5 seconds of machine operation, the display (38) shows the total number of working hours (scrubbing/drying)2. performed by the machine.
Turn the ignition key (42) to “0”.

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18 Operator’s Manual - CR 28 BOOST®
SQUEEGEE CLEANING
NOTE
The squeegee must be clean and its blades must be in good conditions in order to get a good drying.
CAUTION!
It is advisable to use protective gloves when cleaning the squeegee because there may be sharp debris.
Drive the machine on a level floor.1. Insert the ignition key (42) and turn it to “I”.2. Lower the squeegee (12) by pressing the switch (36).3. Turn the ignition key (42) to “0”.4. Disconnect the vacuum hose (11) from the squeegee.5. Loosen the handwheels (15) and remove the squeegee (12).6. Wash and clean the squeegee. In particular, clean the compartments (A, Fig. 3) and the hole (B) from dirt and debris. Check7. the front blade (C) and the rear blade (D) for integrity, cuts and tears; otherwise replace them.
Reassemble in the reverse order of disassembly.8.
SQUEEGEE BLADE CHECK AND REPLACEMENT
Clean the squeegee as shown in the relevant paragraph.1. Check that the edges (E and N, Fig. 3) of the front (17) and rear blades (18) lay down on the same level, along all their length;2. otherwise adjust their height according to the following procedure:
Disengage the fastener (F) and loosen the wing nuts (G) to adjust the rear blade (D); then tighten the wing nuts and• engage the fastener.
Loosen the wing nuts (H) to adjust the front blade (C); then tighten the nuts.•
Check the front blade (C) and rear blade (D) for integrity, cuts and tears; otherwise replace them according to the following3. procedure. Check that the front corner (I) of the rear blade is not worn; otherwise, overturn the blade to replace the worn
corner with an integral one. If the other corners are worn too, replace the blade as shown below:
Disengage the fastener (F), remove the wing nut (G) and the retaining strip (L), then replace (or overturn) the rear blade• (D). Install the blade in the reverse order of removal.
Remove the wing nuts (H) and the retaining strip (M), then replace the front blade (C). Install the blade in the reverse order• of removal.
After the blade replacement (or overturning), adjust the height as shown in the previous step.
Install the squeegee (12) and screw down the handwheels (15).4. Connect the vacuum hose (11) to the squeegee (12).5. If necessary, adjust the squeegee balance adjusting handwheel (16).6.
Figure 3 S311216A