Clarke Focus S28 User manual

Form No. 70851A 1/09 revised 5/10 Clarke®Printed in the U.S.A.
U.S. Patent No. 6,760,947; No. 6,105,192; No. RE39,581 (Deluxe Machines); & Patent Pending
Canada Patent No. 2,353,279 (Deluxe Machines)
S28 / L28 WB
S33 / L33 WB
S38 / L38 WB
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
occuraswell. Youmusthavetrainingintheoperationofthismachinebeforeusingit. 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.
English (2 - 30)
Español (32 - 60)
Français (62 - 90)
READ THIS BOOK
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EN
FR
Operator’s Manual/Manuel d’utilisation/Libro de Instrucciones
Models: 05210A, 05210C, 05220A, 05220C, 05230A, 05230C
05211A, 05211C, 05221A, 05221C, 05231A, 05231C, 05212B, 05222B

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-2- Form No. 70851A Clarke®Operator’s Manual (EN) - FOCUS S28/L28/S33/L33/S38/L38 WB
Table of Contents
Operator Safety Instructions....................................................................................................................................................................3
Introduction .............................................................................................................................................................................................5
Machine Specifications............................................................................................................................................................................5
Procedures For Transporting...................................................................................................................................................................7
Symbols Used On S28, S33, S38...........................................................................................................................................................8
Symbols Used On L28, L33, L38.............................................................................................................................................................9
Machine Control Panel S28, S33, S38 ...................................................................................................................................................10
Machine Control Panel L28, L33, L38.....................................................................................................................................................12
Display Screen For L28, L33, L38...........................................................................................................................................................14
Machine Controls and Features..............................................................................................................................................................15
How To PrepareThe Machine For Operation..........................................................................................................................................16
How To Operate The Machine.................................................................................................................................................................20
Maintenance............................................................................................................................................................................................23
How To Correct AProblem.....................................................................................................................................................................28
Common Error Codes (Focus L28/L33/L38)...........................................................................................................................................29
Section II Parts and Service Manual
Solution TankAssembly...........................................................................................................................................................................92-93
Recovery TankAssembly ........................................................................................................................................................................94-95
Electrical PanelAssembly S28, S33, S38 (Solo Controller)....................................................................................................................96-97
Electrical PanelAssembly S28, S33, S38 (I-Drive Controller).................................................................................................................98-99
Electrical PanelAssembly L28, L33, L38................................................................................................................................................100-101
Control PanelAssembly L28, L33, L38...................................................................................................................................................102
Control PanelAssembly S28, S33, S38 (Solo Controller).......................................................................................................................103
Control PanelAssembly S28, S33, S38 (I-Drive Controller)....................................................................................................................104-105
Squeegee SwingArmAssembly..............................................................................................................................................................106-107
SqueegeeAssembly 28, 33.....................................................................................................................................................................108-109
SqueegeeAssembly 38...........................................................................................................................................................................110-111
Traverse SystemAssembly.....................................................................................................................................................................112-113
Brush HeadAssembly.............................................................................................................................................................................114-115
Brush Motor.............................................................................................................................................................................................116
Gearbox...................................................................................................................................................................................................117
Imperial Transaxle Parts..........................................................................................................................................................................118-119
Accessories.............................................................................................................................................................................................120
Electrical Schematic S28/S33/S38 (Solo Controller)...............................................................................................................................121
Electrical Schematic S28/S33/S38 (I-Drive Controller)...........................................................................................................................122
Electrical Schematic L28/L33/L38...........................................................................................................................................................123

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Clarke®Operator’s Manual (EN) - FOCUS S28/L28/S33/L33/S38/L38 WB Form No. 70851A - 3 -
OPERATOR SAFETY INSTRUCTIONS
DANGER!
Failure to read and observe all DANGER statements could result in severe bodily injury or death. Read and observe all DANGER
statements found in your Owner’s Manual and on your machine.
WARNING!
Failure to read and observe all WARNING statements could result in injury to you or to other personnel; property damage could occur
as well. Read and observe all WARNING statements found in your Owner’s Manual and on your machine.
CAUTION!
Failure to read and observe all CAUTION statements could result in damage to the machine or to other property. Read and observe
all CAUTION statements found in our Owner’s Manual and on your machine.
DANGER!
Failure to read the Owner’s Manual 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 English, have this manual explained fully
before attempting to operate this machine.
DANGER!
Operating a machine that is not completely or fully assembled could result in injury or property damage. Do not operate this machine
until it is completely assembled. Inspect the machine carefully before operation.
DANGER!
Machines can cause an explosion when operated near flammable materials and vapors. Do not use this machine with or near fuels,
grain dust, solvents, thinners, or other flammable materials. This machine is not suitable for picking up hazardous dust.
DANGER!
Lead acid batteries generate gases which can cause an explosion. Keep sparks and flames away from batteries. Do not smoke
around the machine. Charge the batteries only in an area with good ventilation. Make sure that you unplug the AC charger from the
wall outlet before operating the machine.
DANGER!
Working with batteries can be dangerous! Always wear eye protection and protective clothing when working near batteries. Remove
all jewelry. Do not put tools or other metal objects across the battery terminals, or the tops of the batteries.
DANGER!
Using a charger with a damaged power cord could result in an electrocution. Do not use the charger if the power cord is damaged.
WARNING!
Operating this machine from anywhere other than the back of the machine could result in injury or damage. Operate this machine
only from the rear.
WARNING!
This machine is heavy. Get assistance before attempting to transport or move it. Use two able persons to move the machine on a
ramp or incline. Always move slowly. Do not turn the machine on a ramp. If operating machine on a gradient over 2%, do not stop,
turn or park. Read the “Procedures For Transporting” in this manual before transporting.
WARNING!
Machines can topple over if guided over the edges of stairs or loading docks and cause injury or damage. Stop and leave this
machine only on a level surface. When you stop the machine, turn the key “OFF”. Set the parking brake.
WARNING!
Maintenance and repairs performed by unauthorized personnel could result in damage or injury. Maintenance and repairs must be
performed by authorized Clarke personnel only.
WARNING!
Any alterations or modifications of this machine could result in damage to the machine or injury to the operator or other bystanders.
Alterations or modifications not authorized by the manufacturer voids any and all warranties and liabilities.

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-4- Form No. 70851A Clarke®Operator’s Manual (EN) - FOCUS S28/L28/S33/L33/S38/L38 WB
OPERATOR SAFETY INSTRUCTIONS
WARNING!
Electrical components of this machine can “short-out” if exposed to water or moisture. Keep the electrical components of the
machine dry. Wipe the machine down after each use. For storage, keep the machine in a dry building.
WARNING!
Operating a machine without observing all labels and instructional information could result in injury or damage. Read all machine
labels before attempting to operate. Make sure all of the labels and instructional information are attached or fastened to the machine.
Get replacement labels and plates from your Clarke distributor.
WARNING!
Wet floor surfaces can be slippery. Water solutions or cleaning materials used with this type of machine can leave wet areas on the
floor surface. These areas can cause a dangerous condition for the operator or other persons. Always put “Caution” signs around/
near the area you are cleaning.
WARNING!
Improper discharge of waste water may damage the environment and be illegal. The United States Environmental ProtectionAgency
has established certain regulations regarding discharge of waste water. Also, city and state regulations regarding this discharge may
be in your area. Understand and follow the regulations in your area. Be aware of the environmental hazards of chemicals that you
dispose.
CAUTION!
Use of this machine to move other objects or to climb on could result in injury or damage. Do not use this machine as a step or
furniture. Do not ride on this machine.
CAUTION!
Your machine warranty will be voided if anything other than genuine Clarke parts are used on your machine. Always use Clarke parts
for replacement.

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Clarke®Operator’s Manual (EN) - FOCUS S28/L28/S33/L33/S38/L38 WB Form No. 70851A - 5 -
INTRODUCTION
Clarke’s newly designed Focus 38, 33, and 28 automatic scrubbers are efficient and superior floor cleaning machines. The Focus
38 uses two brushes or pads to scrub a path 38 inches wide. The Focus 33 uses two brushes or pads to scrub a path 33 inches
wide. The Focus 28 uses two brushes or pads to scrub a path 28 inches wide. Asqueegee wipes the floor while the vacuum motor
removes the dirty solution from the floor - all in one pass.
The Focus 38, 33, 28 automatic scrubbers come complete with six - 6 volt batteries, five battery connector cables, two battery cables,
one battery charger, either two brushes or two pad drivers, and one operator’s manual.
Machine Specifications
Model S38 S33 S28
Model Number 05230A/ 05230C 05220A/ 05220C / 05222B 05210A/ 05210C / 05212B
Motor, Vac 1 HP (.74kw) three stage tangen-
tial discharge 1HP (.74kw) three stage tagential discharge 1HP (.74kw) three stage tagential discharge
Power Supply 36 volt (6-6V batteries)
242AH, 310AH 36 volt (6-6V batteries) 242AH, 310AH 36 volt (6-6V batteries) 242AH, 310AH
Solution Tank 30 gallon (114 liter) 30 gallon (114 liter) 30 gallon (114 liter)
Recovery Tank 30 gallon (114 liter) 30 gallon (114 liter) 30 gallon (114 liter)
Motors, Brush (2) 1 hp PM (.74kw) 1 hp PM (.74kw) 1 hp PM (.74kw)
Motor Traction .50 hp PM (.37kw) .50 hp PM (.37kw) .50 hp PM (.37kw)
Brushes (2) 19 inch (48cm)
w/.5” (1.5cm) overlap 17 inch (43cm) w/.5” (1.5 cm) overlap 14 inch (36cm) w/.5” (1.5 cm) overlap
Brush Speed 200 rpm 200 rpm 200 rpm
Brush Pressure Variable 150 lbs. - 220 lbs. Variable 150 lbs. - 220 lbs. Variable 150 lbs. - 220 lbs.
Speed, Forward Variable to 230 ft./min. Variable to 230 ft./min. Variable to 230 ft./min.
Speed, Reverse Variable to 180 ft./min. Variable to 180 ft./min. Variable to 180 ft./min.
Charger 36V, 21A, 115V/60hz 36V, 21A, 115V/60hz 36V, 21A, 115V/60hz
Length 68.28 inches (173 cm) 67 inches (170 cm) 65.0 inches (165 cm)
Width - Machine 40.33 inches (102 cm) 35.70 inches (91 cm) 30.0 inches (76 cm)
Height 43.75 inches (112cm) 43.75 inches (112 cm) 43.75 inches (112 cm)
Cleaning Rate 42,000 sq ft/hr (3,901 sq. m/hr) 35,000 sq ft/hr (3,252 sq. m/hr) 29,700 sq ft./hr (2,750 sq ft./hr)
Cleaning Swath 38 inch (97 cm) 33 inch (84 cm) 28 inch (71 cm)
Grade Cleaning 6° Incline 6° Incline 6° Incline
Weight w/Batteries (310AH) 1025 lbs. 465kg 1015 lbs. 460kg 1005 lbs. 456kg
Shipping Weight
w/batteries (310AH) 1328 lbs. 602kg 1318 lbs. 598kg 1308 lbs. 593kg
Noise 76.5 dBA 76.5 dBA 76.5 dBA
Vibration <2.5 m/s2<2.5 m/s2<2.5 m/s2

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-6- Form No. 70851A Clarke®Operator’s Manual (EN) - FOCUS S28/L28/S33/L33/S38/L38 WB
SPECIFICATIONS:
Model L38 L33 L28
Model Number 05231A/ 05231C 05221A/ 05221C 05211A/ 05211C
Motor, Vac 1 HP (.74kw) three 1HP (.74kw) three 1HP (.74kw) three
stage tangential stage tagential stage tagential
discharge discharge discharge
Power Supply 36 volt (6-6V batteries) 36 volt (6-6V batteries) 36 volt (6-6V batteries)
242AH, 310AH 2420AH, 310AH 242AH, 310AH
Solution Tank 30 gallon (114 liter) 30 gallon (114 liter) 30 gallon (114 liter)
Recovery Tank 30 gallon (114 liter) 30 gallon (114 liter) 30 gallon (114 liter)
Motors, Brush (2) 1 hp PM (.74kw) 1 hp PM (.74kw) 1 hp PM (.74kw)
Motor Traction .50 hp PM (.37kw) .50 hp PM (.37kw) .50 hp PM (.37kw)
Brushes (2) 19 inch (48cm) 17 inch (43cm) 14 inch (36cm)
w/.5” (1.5cm) overlap w/.5” (1.5 cm) overlap w/.5” (1.5 cm) overlap
Brush Speed 200 rpm 200 rpm 200 rpm
Brush Pressure Variable 140 lbs. - 220 lbs. Variable 140 lbs. - 220 lbs. Variable 140 lbs. - 220 lbs.
Speed, Forward Variable to 230 ft./min. Variable to 230 ft./min. Variable to 230 ft./min.
Speed, Reverse Variable to 180 ft./min. Variable to 180 ft./min. Variable to 180 ft./min.
Charger 36V, 21A, 115V/60hz 36V, 21A, 115V/60hz 36V, 21A, 115V/60hz
Length 68.28 inches (173 cm) 67 inches (170 cm) 65.0 inches (165 cm)
Width - Machine 40.33 inches (102 cm) 35.70 inches (91 cm) 30.0 inches (76 cm)
Height 43.75 inches (112cm) 43.75 inches (112 cm) 43.75 inches (112 cm)
Cleaning Rate 42,000 sq ft/hr 35,000 sq ft/hr 29,700 sq ft./hr
(3,901 sq. m/hr) (3,252 sq. m/hr) (2,750 sq ft./hr)
Cleaning Swath 38 inch (97 cm) 33 inch (84 cm) 28 inch (71 cm)
Grade Cleaning 6° Incline 6° Incline 6° Incline
Weight w/Batteries
(310AH) 1025 lbs. 465kg 1015 lbs. 460kg 1005 lbs. 456kg
Shipping Weight
w/batteries (310AH) 1328 lbs. 602kg 1318 lbs. 598kg 1308 lbs. 593kg
Noise 76.5 dBA 76.5 dBA 76.5 dBA
Vibration <2.5 m/s2 <2.5 m/s2 <2.5 m/s2

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Clarke®Operator’s Manual (EN) - FOCUS S28/L28/S33/L33/S38/L38 WB Form No. 70851A - 7 -
PROCEDURES FOR TRANSPORTING
How To Put The Machine In A Van Or Truck
WARNING:
The machine is heavy. Make sure you use two able persons to assist the machine in climbing the ramp.
1. Make sure the loading ramp is at least eight (8) feet long, and strong enough to support the machine.
2. Make sure the ramp is clean and dry.
3. Put the ramp in position.
4. Remove squeegee assembly, brush housings, & brushes or pad drivers before loading.
5. Turn key switch “ON”.
6. Align the machine on a level surface ten (10) feet in front of the ramp.
7. Put the traverse speed switch in the “HI” position.
8. Press one or both forward switches.
9. Push the machine to the top of the ramp.
10. Turn the key switch “OFF”.
11. Fasten the machine to the vehicle.
How To Remove The Machine From A Van Or Truck
1. Make sure there are no obstructions in the area.
2. Make sure the unloading ramp is at least eight (8) feet long and strong enough to support the machine.
3. Make sure the ramp is clean and dry.
4. Put the ramp in position.
5. Unfasten the machine.
WARNING:
The machine is heavy. Make sure you use two able persons to assist in moving the machine down the ramp.
6. Turn the key switch “ON”.
7. Carefully and slowly, drive the machine to the top of the ramp by pressing and holding either of the forward switches and the
reverse switch.
8. Put the traverse speed switch to the mid range speed setting. As the machine begins to travel down the ramp, maintain a slow
downward speed by pressing either of the forward switches.
9. Replace squeegee assembly, brush housings, & brushes or pad drivers after the machine is unloaded and ready to use.

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-8- Form No. 70851A Clarke®Operator’s Manual (EN) - FOCUS S28/L28/S33/L33/S38/L38 WB
SYMBOLS USED ON FOCUS S28, S33, & S38
HazardAlert Symbol
On/Off Key Switch
Brush Up/Down
Solution Control
Power
Traverse Speed Control
Additional Brush Pressure
Charge/Battery Meter (Solo)
Charge Indicator (I-Drive)
revised 12/09

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Clarke®Operator’s Manual (EN) - FOCUS S28/L28/S33/L33/S38/L38 WB Form No. 70851A - 9 -
SYMBOLS USED ON FOCUS L28, L33 & L38
HazardAlert Symbol
On/Off Key Switch
Squeegee Up/Down
Solution Control
Hour Meter Switch
Power
Traverse Speed Control
Brush Up/Down
Charge Indicator
One Touch Switch

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-10- Form No. 70851A Clarke®Operator’s Manual (EN) - FOCUS S28/L28/S33/L33/S38/L38 WB
MACHINE CONTROL PANEL S28, S33 & S38
Key Switch (See Figure #1, Item “A”)
The key switch turns “ON” the power to the control panel. “0” is “OFF” and “I” is “ON”.
Traverse Speed Switch (See Figure #1, Item “B”)
The speed control varies from low to high speed. To increase the speed, turn the knob to the right. To decrease the speed, turn the
knob to the left.
Brush Up/Down Switch (See Figure #1, Item “C”)
The brush switch has two positions: “Up” positions the brushes up; “Down” positions the brushes on the floor. The brush motors start
when the brushes are down and the traverse switch is depressed.
Increase Brush Pressure Switch (See Figure #1, Item D)
This switch is used to increase the brush pressure. Increased brush pressure may be required when stripping or cleaning heavily
soiled floors. To increase brush pressure, first lower the brushes by pressing the brush up/down switch (Item “C”) to the down
position. This will lower the brushes to the normal scrub position. To increase brush pressure, press and hold the switch (Item “D”)
until the desired brush pressure is reached or the brush deck stops moving downward. To reposition the brush pressure to normal
scrub, press the brush up/down switch (Item “C”) to the up position and after the brush deck is completely raised, then return the
switch to the down position for normal scrub.
Solution Control Knob (See Figure #1, Item “E”)
The solution control knob regulates the flow of cleaning solution to the floor. To increase the flow turn the knob clockwise. To
decrease the flow, turn the knob counter-clockwise.
Forward Switch (See Figure #1, Item “F”)
The forward switch turns the traverse motor “on” and if the brush motors are in the down position, it also activates the brush motors
and solution control module. Either the right or the left switch can be used.
Reverse Switch (See Figure #1, Item “G”)
The reverse switch, when used in conjunction with one of the forward switches, causes the machine to reverse direction. The reverse
speed is 70% of the forward speed.
Charge / Battery Meter (Solo) (See Figure #1, Item “H1”)
The charge/battery meter indicates the battery is being charged when the charger is plugged into anAC outlet. It also indicates the
amount of charge that is left in the batteries while the machine is in use. When the battery charger gets too low the red light will begin
flashing and the brush/pad motors will shut off.
Battery Meter / Charge Indicator Light (See Figure #1, Item “H2”)
The battery meter indicates the amount of charge remaining in the batteries while the machine is in use.
When the charger is plugged into anAC Outlet, the charge green indicator light will flash on and off. When the batteries become fully charged, the
green indicator light will remain on until the charger is unplugged.
Circuit Breakers (See Figure #1, Item “I”-”M”)
The circuit breaker reset buttons are located on the control panel. The breakers are located as follows: Item I & J - Brush Motors
(35A); Item K - Traverse Motor (30A); Item L- Vac Motor (25A); Item M -Actuator Motor, Brush Head (5A)
If a circuit breaker trips, determine which motor is not operating and turn the key switch “OFF”. Wait five minutes and push the reset
button back in. Turn the key switch “ON”, and try again. An authorized service person should be contacted if the breaker trips again.
Hour Meter (See Figure #1, Item “N”)
The hour meter indicates the number of hours the machine has operated. It runs only when the machine is moving forward or
reverse.
revised 12/09