Clarke Encore S28 User manual

Form No. 70656A 8/04 Clarke®Printed in the U.S.A.
READ THIS BOOK
This book has important information for the use and safe operation of this machine. Failure to read this
bookpriortooperatingorattemptinganyserviceormaintenanceproceduretoyourClarkemachinecould
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.
Si Ud. o sus operadores no pueden leer el Inglés, se hagan explicar este manual completamente antes
de tratar el manejo o servicio de esta máquina.
All directions given in this book are as seen from the operator’s position at the rear of the machine.
For new books write to: Clarke®, 2100 Highway 265, Springdale, Arkansas 72764.
Operator's
Manual
ENCORE
S28/L28
S33/L33
S38/L38
U.S. Patent No. 6,105,192; No. 5,383,251; No. 6,493,896 (Deluxe Machines) and other Patents Pending
Division of

Page -2- Clarke®Operator's Manual -Encore S28/L28/S33/L33/S38/L38
Table of Contents
Operator Safety Instructions............................................................................................................................. 3
Introduction & Machine Specifications "L" Class............................................................................................. 5
Introduction & Machine Specifications "S" Class ............................................................................................ 6
Procedures For Transporting........................................................................................................................... 7
Symbols Used On Encore Machines............................................................................................................... 8
Machine Control Panel "S" Class .................................................................................................................... 10
Machine Control Panel "L" Class..................................................................................................................... 11
Machine Controls and Features ...................................................................................................................... 13
How To Prepare The Machine For Operation .................................................................................................. 14
How To Install The Batteries ............................................................................................................. 14
Battery Maintenance........................................................................................................................... 15
How To Charge The Batteries ........................................................................................................... 16
How To Install The Brushes Or Pad Drivers ..................................................................................... 17
How To Remove The Brushes Or Pad Drivers ................................................................................. 17
How To Operate The Machine ......................................................................................................................... 18
How To Operate The Squeegee........................................................................................................ 18
How To Fill The Solution Tank........................................................................................................... 18
How To Clean A Floor ........................................................................................................................ 20
Maintenance ..................................................................................................................................................... 21
Accessories...................................................................................................................................................... 26
Section II Parts and Service Manual
How To Correct Problems In The Machine...................................................................................................... 28
Maintenance, Head Position System............................................................................................................... 29
Squeegee/Swing Arm Assembly Drawing....................................................................................................... 30
Parts List ............................................................................................................................................ 31
Traverse System Assembly Drawing............................................................................................................... 32
Parts List ............................................................................................................................................ 33
Brush Head Assembly Drawing...................................................................................................................... 34
Parts List ............................................................................................................................................ 35
Solution/Recovery System Assembly Drawing................................................................................................ 36
Parts List ............................................................................................................................................ 37
Brush Motor Drawing & Parts List.................................................................................................................... 38
Gear Box Assembly Drawing & Parts List ....................................................................................................... 39
VacMotor .......................................................................................................................................................... 40
L33/L38 Brake and Transaxle Imperial ........................................................................................................... 41
36 Volt Battery Charger Drawing & Parts List .................................................................................................. 42
Components for machines with 41135C Traverse Controller ........................................................................ 44-51
Control Housing Assembly Drawing ................................................................................................. 44
Parts List...................................................................................................................................... 45
Rear Cover Assembly Drawing ......................................................................................................... 46
Parts List...................................................................................................................................... 47
S28/S33/S38 Electrical Schematic .................................................................................................... 48
S28/S33/S38 Connection Diagram ................................................................................................... 49
L28/L33/L38 Electrical Schematic..................................................................................................... 50
L28/L33/L38 Connection Diagram ................................................................................................... 51
Components for machines with 40089A Traverse Controller......................................................................... 54-61
Control Housing Assembly Drawing ................................................................................................. 54
Parts List...................................................................................................................................... 55
Rear Cover Assembly Drawing ......................................................................................................... 56
Parts List...................................................................................................................................... 57
S28/S33/S38 Electrical Schematic .................................................................................................... 58
S28/S33/S38 Connection Diagram ................................................................................................... 59
L28/L33/L38 Electrical Schematic..................................................................................................... 60
L28/L33/L38 Connection Diagram .................................................................................................... 61

Clarke®Operator's Manual - Encore S28/L28/S33/L33/S38/L38 - 3 -
OPERATOR SAFETY INSTRUCTIONS
WARNING AVERTISSEMENT ADVERTENCIA
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)cannotreadEnglish, have this manualexplainedfullybeforeattempting
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 diconnecting from 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.

Page -4- Clarke®Operator's Manual -Encore S28/L28/S33/L33/S38/L38
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.
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 Protection Agency 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 dam-
age. 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.

Clarke®Operator's Manual - Encore S28/L28/S33/L33/S38/L38 - 5 -
SPECIFICATIONS:
Model L38 - 00740A L33 - 00720A L28 - 00700A
Motor, Vac 1HP(.67kw)three 1HP(.67kw)three 1HP(.67kw)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)
250AH, 330AH, or 370AH 250AH, 330AH, or 370AH 250AH, 330AH, or 370AH
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) 1hp PM (.74kw) .75 hp PM (.56kw)
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/1" (3cm) overlap w/.5" (1.5cm) overlap
Brush Speed 200 rpm 200 rpm 200 rpm
Brush Pressure Variable 120 lbs-220lbs Variable 120 lbs-220 lbs Variable 120 lbs-220 lbs
Speed, Forward Variable to 230 ft/min. Variable to 230 ft/min. Variable to 230 ft/min.
Speed, Reverse Variable to 180ft/min. Variable to 180ft/min. Variable to 180ft/min.
Charger 36V, 25A, 115V/60hz 36V, 25A, 115V/60hz 36V, 25A, 115V/60hz
Length 66 inches (168cm) 63 inches (160cm) 62.5 inches (159cm)
Width - Machine 28 inches (71cm) 28 inches (71cm) 28 inches (71cm)
Height 44 inches (112cm) 44 inches (112cm) 44 inches (112cm)
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. m/hr)
Cleaning Swath 38 inch 33 inch 28 inch (66cm)
Grade Cleaning 6° Incline 6° Incline 6° Incline
Weight w/Batteries (330AH) 1038 lbs. 471kg 1028 lbs. 467kg 1018 lbs. 462kg
Shipping Weight 1341 lbs. 608kg 1331 lbs. 604kg 1321 lbs. 599kg
w/batteries (330AH)
Introduction & Machine Specifications
Introduction & Machine Specifications
Clarke’s newly designed Encore 38, 33 and 28 automatic scrubbers are efficient and superior floor cleaning
machines. The Encore 38 uses two brushes or pads to scrub a path 38 inches wide. The Encore 33 uses two
brushes or pads to scrub a path 33 inches wide. The Encore 28 uses two brushes or pads to scrub a path 28
inches wide. A squeegee wipes the floor while the vacuum motor removes the dirty solution from the floor - all
in one pass.
The Encore 38, 33 and 28 automatic scrubbers come complete with six - 6 volt batteries, five battery
connector cables, one battery cable assembly, one battery charger, either two brushes or two pad drivers,
andoneoperator’smanual.

Page -6- Clarke®Operator's Manual -Encore S28/L28/S33/L33/S38/L38
Introduction & Machine Specifications (Con't)
SPECIFICATIONS:
Model S38 - 00680A S33 - 00660A S28 - 00640A
Motor, Vac 1HP (67kw)three 1HP(67kw)three 1HP(67kw)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)
250AH, 330AH, or 370AH 250AH, 330AH, or 370AH 250AH, 330AH, or 370AH
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) .75 hp PM (.56kw) .75 hp PM (.56kw)
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/1" (3 cm) overlap w/.5" (1.5 cm) overlap
Brush Speed 200 rpm 200 rpm 200 rpm
Brush Pressure 150 lbs. 150 lbs. 150 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, 25A, 115V/60hz 36V, 25A, 115V/60hz 36V, 25A, 115V/60hz
Length 66 inches (168cm) 63 inches (160cm) 62.5 inches (159cm)
Width - Machine 28 inches (71cm) 28 inches (71 cm) 28 inches (71 cm)
Height 44 inches (112cm) 44 inches (112 cm) 44 inches (112 cm)
Cleaning Rate 42,000 sq ft/hr 35,000 sq ft/hr 29,7000 sq ft./hr
(3,901 sq. m/hr) (3,252 sq. m/hr) (2,750 sq ft./hr)
Cleaning Swath 37.5 inch (95.3cm) 33 inch (84cm) 28, inch (70cm)
Grade Cleaning 6° Incline 6° Incline 6° Incline
Weight w/Batteries (330AH) 1038 lbs. 471kg 1028 lbs. 467kg 1018 lbs. 462kg
Shipping Weight 1341 lbs. 608kg 1331 lbs. 604kg 1321 lbs. 599kg
w/batteries (330AH)

Clarke®Operator's Manual - Encore S28/L28/S33/L33/S38/L38 - 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. Push the control handles toward the machine all the way.
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, pull the machine to the top of the ramp.
8. Put the traverse speed switch in the "HI" position.
9. As the machine begins to travel down the ramp, push the control handles toward the machine to
maintain a slow downward speed.
10. Replace squeegee assembly, brush housings, & brushes or pad drivers after the machine is unloaded
and ready to use.

Page -8- Clarke®Operator's Manual -Encore S28/L28/S33/L33/S38/L38
SYMBOLS USED ON ENCORE S38, S33, & S28
and L38, L33, & L28
Warning ("L Class" & "S Class')
Power ("L Class" & "S Class")
On/Off Key Switch ("L Class" & "S Class")
Traverse Speed Control ("L Class" & "S Class")
Solution Control ("L Class" & "S Class")
Brush Up/Down ("L Class" & "S Class")

Clarke®Operator's Manual - Encore S28/L28/S33/L33/S38/L38 - 9 -
SYMBOLS USED ON ENCORE S38, S33 & S28
L38, L33, & L28
Battery Meter
("L Class" & "S Class")
Hour Meter
("L Class" & "S Class")
Warning Label
("LClass"&"SClass")
with parking brake
Warning Label
("LClass"&"SClass")
without parking brake
Squeegee/Vacuum
("L Class" Only)
Brush Pressure
Increase/Decrease
("L Class" Only)
Brush Pressure Meter
("L Class" Only)

Page -10- Clarke®Operator's Manual -Encore S28/L28/S33/L33/S38/L38
MACHINE CONTROL PANEL (S38, S33 & S28)
Key Switch (See Figure #1, Item "A")
The key switch turns "ON" the power to the control panel. "0" is "OFF" and "1" 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.
Solution Control Knob (See Figure #1, Item "D")
The solution control knob regulates the flow of cleaning solution to the floor. To increase the flow turn the knob clock-
wise. To decrease the flow, turn the knob counter-clockwise.
Control Handle (See Figure #1, Item "E")
The control handle is located at the rear of the machine. It controls the direction of the machine. Push forward to go
forward. (See Figure #3, page 10). Pull back to move in reverse. (See Figure #4, page 10).
Circuit Breakers (See Figure #1, Item "F"-"J")
The circuit breaker reset buttons are located on the rear cover, below the control handle. The breakers are located as
follows: Item F & G - Brush Motors (35A)
Item H - Traverse Motor (30A)
Item I - Vac Motor (25A)
Item J - 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 K)
The hour meter indicates the number of hours the machine has operated. It runs only when the machine is moving
forward or reverse.
Figure #1
E
A
B
C
D
JIHGF
K

Clarke®Operator's Manual - Encore S28/L28/S33/L33/S38/L38 - 11 -
MACHINE CONTROL PANEL (L38, L33 & L28)
Key Switch (See Figure #2, Item "A")
The key switch turns "ON" the power to the control panel. "0" is "OFF" and "1" is "on".
Traverse Speed Control Knob (See Figure #2, 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 Head Up/Down Switch (See Figure #2, Item "C")
The brush switch has two positions: "Up" positions the brushes up; "Down" positions the brushes on the
floor. The brush motors will not run until the control handles are activated.
Brush Pressure Knob (See Figure #2, Item "D")
The brush pressure knob is used to increase the pressure on the brushes from the initial scrub position. Turn
the knob counter clockwise to decrease pressure. Trun knob clockwise to increase pressure.
Solution Control Knob (See Figure #2, 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.
Squeegee/Vacuum Switch (See Figure #2, Item "F")
The 3 position squeegee switch positions the squeegee either: (1) Up with vac motor "OFF", (2) Up with vac
motor "ON", or (3) Down with vac motor "ON". The squeegee will automatically raise up when the control
handles are pulled into reverse.
Control Handle (See Figure #2, Item "G")
The control handle controls the direction that the machine moves. It is at the back of the machine. Push
forward to go forward (see figure #3), pull back to move in reverse (see figure #4).
Note: The reverse speed is automatically reduced by approximately 30 percent. Releasing the
control handle to the center position applies a dynamic brake to the traverse motor to slow
the machine down. If the machine is scrubbing and the control handle is released, the
brush motors will stop after two seconds.
Battery Meter (See Figure #2, Item "H")
The battery meter indicates the relative charge on the battery pack. Do not continue to run the machine when
the meter is in "red" area. This will shorten the life of the battery.
Brush Pressure Meter (See Figure #2, Item "I")
The brush pressure meter indicates the relative amount of pressure the brushes or pads are putting on the
floor. To maximize run time on a battery charge, keep the light bars towards the center of the green area. To
avoid damage to the brush motors, do not run the machine in the "red" area.
Hour Meter (See Figure #2, Item "J")
The hour meter indicates the number of hours the machine has operated. It runs only when the machine is
moving forward or reverse.

Page -12- Clarke®Operator's Manual -Encore S28/L28/S33/L33/S38/L38
MACHINE CONTROL PANEL (L38, L33 & L28)
Figure #2
Figure #3 Figure #4
Circuit Breakers (See Figure #2, Item "K"-"P")
The circuit breaker reset buttons are located on the rear cover, below the control handle. The breakers are
located as follows: Item K & L - Brush Motors (35A)
Item M - Traverse Motor (30A)
Item N - Vac Motor (25A)
Item O - Actuator Motor, Brush Head (5A)
Item P - Actuator Motor, Squeegee (1.5 Amp)
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. Contact an authorized
service person if the breaker trips again.
G
A
B
C
D
EFH
I
J
PONML K

Clarke®Operator's Manual - Encore S28/L28/S33/L33/S38/L38 - 13 -
MACHINE CONTROLS & FEATURES
Squeegee Lift Handle See Figure #5a, 5b, & 5c.
The squeegee lift handle is located below the control
handles on the right side. It is used to raise or lower the
squeegee. The vac motor is turned on when the handle is
lowered. (S38, S33 & S28 models only).
Parking Brake (Optional)See Figure #6.
The parking brake prevents movement of the machine. The
brake is located on the left hand side of the transaxle
motor. Turn the key switch off or disconnect the power to
the battery to apply the brake.
There is a mechanical lever located on the brake. This
lever is an override. To manually release the brake, rotate
the lever toward the rear of machine (counter clockwise).
To return the brake to normal or to apply the brake, rotate
the lever towards the front of the machine (clockwise).
NOTE: If the lever is left in the override position, the
brake will not function with the key switch, and the
machine will not operate.
CAUTION: Do not activate the brake while the machine
is moving.
Float Shut Off See Figure #7.
The shut-off switch for the vac motor is located in the
recovery tank. It automatically turns off the vac motor when
the recovery tank is full.
Figure #5a
Figure #5b
Figure #5c
Figure #7
Figure #6

Page -14- Clarke®Operator's Manual -Encore S28/L28/S33/L33/S38/L38
HOW TO PREPARE THE MACHINE FOR OPERATION
How To Install The Batteries
The 38, 33 and 28 Encore machines use six 6-volt or
three 12-volt batteries. The batteries are located in
the battery compartment under the recovery tank.
To Install the batteries, follow this procedure:
1. Turn key switch off.
2. Make sure both tanks are empty.
3. Disconnect the hoses from the recovery tank
(upper tank) & unplug the vac motor.
Remove the recovery tank.
4. Place the batteries in the solution tank as
shown in figures 8a - 8d.
WARNING: Lifting batteries without
help could result in an
injury. Get help to lift the
batteries. The batteries are
heavy.
WARNING: Working with batteries can
be dangerous. Always
wear eye protection and
protective clothing when
working near batteries.
NO SMOKING!
5. Connect the battery cables between
batteries and install long battery cable
assembly as indicated. See figure 8a - 8d.
Figure #8a
Figure #8b
Figure #8cFigure #8d
38720B
38722B
38720B
38720B
38722B
38722B
38722B
38722B
38722B
38720B
38720B
38720B
38720B
38720B
38722B
38720B
38722B
38722B

Clarke®Operator's Manual - Encore S28/L28/S33/L33/S38/L38 - 15 -
6. Join the connector from the battery pack to
the connector on the control panel. See
figure #9.
7. Install the tank, reconnecting hoses and
replace the two screws attaching the
solution tank to the rear of the frame.
NOTE: Charge the batteries before using the
machine.
Battery Maintenance
The electrical power to operate the machine comes from
the storage batteries. Storage batteries need preventive
maintenance.
WARNING: Workingwithbatteriescanbedan-
gerous. Always wear eye protec-
tion and protective clothing when
working near batteries.
NO SMOKING!
To maintain the batteries in good condition, follow these
instructions:
1. Keeptheelectrolyte at the correctlevel. Thecorrect
levelis between 1/4" below the bottomofthetube in
eachcellandabovethetopsoftheplates. Checkthe
level of the electrolyte each time you charge the
batteries. See figure #10.
NOTE: Checkthelevelofelectrolytepriortochargingthe
batteries. Besuretheplatesineachcellarecoveredwith
electrolyte . Do not top off the cells prior to charging the
battery. Electrolyteexpandsduringcharging. Asaresult,
the electrolyte could overflow from the cells. Always top
off the cells with distilled water after charging.
CAUTION: Irreversible damage will occur to
the batteries if the electrolyte level
doesnotcovertheplates. Keepthe
electrolyte at the correct level.
CAUTION: Machine damage and discharge
acrossthetopsofthebatteriescan
occur if the batteries are filled
above the bottom of the tube in
eachcell.Donotfillthebatteriesup
to the bottom of the tube in each
cell. Wipe any acid from the ma-
chine or the tops of the batteries.
Never add acid to a battery after
installation.
CAUTION: Tap water may contain contami-
nants that will damage batteries.
Batteriesmustbere-filledwithdis-
tilled water only.
Figure #10
HOW TO PREPARE THE MACHINE FOR OPERATION
Figure #9
Correct fill level
2. Keep the tops of the batteries clean and dry.
Keep the terminals and connectors clean. To
clean the top of the batteries, use a damp cloth
witha weaksolutionofammoniaorbicarbonate
of soda solution. To clean the terminals and
connectors,useaterminalandconnectorclean-
ingtool. Donotallowammoniaorbicarbonateof
soda to get into batteries.
3. Keep the batteries charged.

Page -16- Clarke®Operator's Manual -Encore S28/L28/S33/L33/S38/L38
How To Charge The Batteries
WARNING: Chargingthe batteries inan area
without adequate ventilation
could result in an explosion. To
preventanexplosion,chargethe
batteries only in an area with
good ventilation.
WARNING: Lead acid batteries generate
gases which could explode.
Keep sparks and flames away
from batteries. NO SMOKING!
WARNING: FailuretodisconnecttheACplug
from the wall receptacle before
connectingordisconnecting the
DC connector on the charger
could result in an explosion. Al-
ways disconnect the AC plug
from the wall receptacle before
connectingordisconnecting the
DC connector on the charger.
To charge the batteries, follow this procedure:
1. Put the charger on a flat surface. Make sure the
vents on the sides are at least two inches away
fromwallsandotherobjects. Makesurethere are
no objects near the vents on the bottom of the
charger.
2. Make sure the key switch is in the “OFF” position.
3. Disconnect the battery pack connector from the
control housing connector. See figure #11.
4. Connect the DC connector on the charger to the
battery pack connector. See figure #12.
5. Connectthechargertoaproperlygroundedsingle
phase(3-wire)wall receptaclehavingthevoltage,
frequency, and ampere capacity specified on the
nameplate of the charger.
Formoreinstruction ontheuseof thecharger,readthe
instruction book supplied with the charger.
HOW TO PREPARE THE MACHINE FOR OPERATION
Figure # 11
Figure #12

Clarke®Operator's Manual - Encore S28/L28/S33/L33/S38/L38 - 17 -
How To Install The Brushes Or Pad Drivers
To install the brushes or pad drivers on the machine,
follow this procedure:
1. Turn the key switch "ON".
2. Put the brush switch in the "UP" position.
3. Turn the key switch "OFF".
4. Go to the front of the machine.
5. Unlatch right and left brush housings and remove
them. See figure #13.
6. Putabrushorpaddriverunderthebrushmotorplate.
See figure #14.
7. Alignthelugsonthemotorgimbalwiththeslotsinthe
brush gimbal.
8. Pull the brush up until the gimbal locks.
9. Repeat steps 6, 7, and 8 to install the second brush
or pad driver.
How To Remove The Brushes Or Pad Drivers
To remove the brushes or pad drivers from the
machine,follow this procedure:
1. Turn the key switch "ON".
2. Put the brush switch in the "UP" position.
3. Turn the key switch "OFF".
4. Go to the front of the machine.
5. Pushdownontwosidesofthebrushorpaddriveruntil
the gimbals release.
HOW TO PREPARE THE MACHINE FOR OPERATION
Figure #13
Figure #14

Page -18- Clarke®Operator's Manual -Encore S28/L28/S33/L33/S38/L38
HOW TO OPERATE THE MACHINE
How To Operate the Squeegee
("S Class" models only)
The squeegee wipes the floor while the vacuum motor
removes the dirty solution from the floor. Use your right
hand to lower or raise the squeegee handle. To operate
the squeegee, follow this procedure:
1. To lower the squeegee and start the vac motor move
the squeegee lever to the right and down. See figure
#15.
2. To raise the squeegee, lift the squeegee lever up.
See figure #16.
Note: The center position lets the vac motor continue
to run with the squeegee off the floor to avoid drips.
How to Fill The Solution Tank
CAUTION: Make sure water or solution
does not enter the opening for
the vacuum motor See figure
#17.
The solution tank lid is at the front. To fill the solution tank
follow this procedure:
1. Remove the solution tank lid. See figure #18
2. Fill the solution tank with water.
3. Add a cleaning chemical to the water. for the
correctamount, follow the directions shownonthe
container.
WARNING: Watersolutions or cleaningmaterials
used with this type of machine can leave
wetareasonthefloorsurface. These
areascancauseadangerouscondition
fortheoperatororotherpersons.
AlwaysputCAUTION signsnearthe
areayouarecleaning.
WARNING: Machinescanigniteflammablematerials
and vapors. Do not use with or near
flammablessuchasgasoline,grain
dust, solvents, and thinners. Only use a
cleaningconcentrationrecommendedby
thechemicalmanufacturer.
WARNING: Clarkerecommendsamaximumwater
temperature of 120°F(49°C)
4. Replace the solution tank lid.
Figure #15
Figure #16
Figure #17
Figure #18

Clarke®Operator's Manual - Encore S28/L28/S33/L33/S38/L38 - 19 -
NOTE: Put the machine in the slow traverse speed.
Use the machine in an area that has no furniture and
objects until you can do the following:
1. Movethemachineinastraightdirection,forwardand
backward.
2. Stop the machine safely.
3. Movethemachineinastraightdirectionafteryouturn
the machine.
To move the machine, follow this procedure:
1. Turn the key switch “ON” position.
2. Put the brush switch in the "UP" position.
3. Raise the squeegee.
4. To go forward, push the control handles toward the
machine. See figure #19.
5. To stop the machine, put the handles in the center
position.
6. To go backward, pull the handles away from the
machine. See figure #20.
7. Toturn themachine,pushtherear ofthemachineto
the side.
8. When you stop the machine, turn the key switch
"OFF".
Figure # 19
Figure #20
HOW TO OPERATE THE MACHINE (cont.)

Page -20- Clarke®Operator's Manual -Encore S28/L28/S33/L33/S38/L38
HOW TO OPERATE THE MACHINE (cont.)
HOW TO CLEAN A FLOOR
WARNING: Water solutions or cleaning mate-
rialsusedwiththistypeofmachine
can leave wet areas on the floor
surfaces. Theseareascancausea
dangerousconditionfortheopera-
tor or other persons. Always put
CAUTION signs near the area you
are cleaning.
To clean a floor, follow this procedure:
1. Put the water and a cleaning chemical in the clean
solution tank.
2. Turn the key switch "ON".
3. Lower the squeegee.
4. Put the brush switch in the "DOWN" position.
5. Turnthesolutionknobtotherighttoactivatetheflow
of solution. Adjust the flow of clean solution to the
flow desired.
6. Move the machine across the floor in the forward
direction. See figure #21 (1).
7. When the machine is one machine length from the
end of the area to be cleaned (figure #21 (2)), rotate
the solution knob to the left.
8. Make a 1800turn. See figure #21 (3).
NOTE: Whenyoumakemorepassesacrossthefloor,let
the brushes clean approximately 2 inches of the
area already cleaned by the brushes. See figure
#21 (4).
NOTE: During most cleaning procedures, apply and
remove the solution in one operation.
HOW TO CLEAN A VERY DIRTY FLOOR
To clean a very dirty floor, follow this procedure:
1. Apply solution to the floor.
2. Do not lower the squeegee.
3. Do not activate the vacuum motor.
4. Lower the brushes and scrub the floor.
5. Leave the solution on the floor long enough for the
solution to begin cleaning the floor.
6. Scrubtheflooragainwithadditionalsolution,picking
up all the solution with the squeegee
Figure #21
3
4
2