Nobles Speed Scrub Orbital User manual

ENGLISH
®
9010343
Rev. 00 (12-2012)
AUTOMATIC SCRUBBER
*9010343*
®
OPERATOR MANUAL
SPEED SCRUB ORBITAL
Model Part No:
9010476 Conventional Scrubber
9010475 ec-H2O Scrubber
www.nobles.com/manuals

OPERATION
2Nobles Speed Scrub Orbital (12--2012)
INTRODUCTION
This manual is furnished with each new model.
It provides necessary operation and maintenance
instructions.
Read this manual completely and understand the
machine before operating or servicing it.
This machine will provide excellent service. However,
the best results will be obtained at minimum costs if:
SThe machine is operated with reasonable care.
SThe machine is maintained regularly - per the
machine maintenance instructions provided.
SThe machine is maintained with manufacturer
supplied or equivalent parts.
Parts and supplies may be ordered online, by phone,
byfaxorbymail.
PROTECT THE ENVIRONMENT
Please dispose of packaging materials,
old machine components, and fluids in
an environmentally safe way according
to local waste disposal regulations.
Always remember to recycle.
INTENDED USE
This walk behind orbital scrubber is intended for
commercial use, for example in hotels, schools,
hospitals, factories, shops, offices, and rental
businesses. It is designed to scrub floors in an indoor
environment and is not constructed for any other use.
Use only recommended pads and commercially
available floor cleaners intended for machine
application. Do not use flammable liquids with this
machine. This machine is not intended for cleaning
carpets or sanding wood floors.
Tennant Company
PO Box 1452
Minneapolis, MN 55440 USA
Phone: [phone] or (763) 513--2850
www.nobles.com
Specifications and parts are subject to change without notice.
Original instructions, copyright 2012 TENNANT Company.
All rights reserved.
MACHINE DATA
Please fill out at time of installation
for future reference.
Model No. --
Serial No. --
Machine Options --
Sales Rep. --
Sales Rep. phone no. --
Customer Number --
Installation Date --
TABLE OF CONTENTS
SAFETY PRECAUTIONS 3....................
SAFETY LABELS 4...........................
MACHINE COMPONENTS 5...................
CONTROL PANEL COMPONENTS 6...........
MACHINE INSTALLATION 7...................
HOW THE MACHINE WORKS 8...............
PAD INFORMATION 8........................
MACHINE SETUP 9..........................
MACHINE OPERATION 11.....................
DRAINING TANKS 15..........................
CHARGING BATTERIES 16....................
MACHINE MAINTENANCE 18..................
TRANSPORTING MACHINE 23.................
STORING MACHINE 23........................
TROUBLESHOOTING 25.......................
BATTERY METER LED FAULT CODES 27.......
MACHINE SPECIFICATIONS 28................
MACHINE DIMENSIONS 29....................

OPERATION
Nobles Speed Scrub Orbital (12--2012) 3
SAFETY PRECAUTIONS
The following warning alert symbol and the “FOR
SAFETY” heading are used throughout this manual as
indicated in their description:
WARNING: To warn of hazards or unsafe
practices which could result in severe personal
injury or death.
FOR SAFETY: To identify actions which must be
followed for safe operation of equipment.
The following safety precautions signal potentially
dangerous conditions to the operator or
equipment. All operators must read, understand
and practice them.
WARNING: Fire Or Explosion Hazard:
-- Never Use Flammable Liquids Or Operate
Machine in Or Near Flammable Liquids, Vapors
Or Combustible Dusts.
This machine is not equipped with explosion
proof motors. The electric motors will spark
upon start up and during operation which
could cause a flash fire or explosion if machine
is used in an area where flammable
vapors/liquids or combustible dusts are
present.
-- Do Not Pick Up Flammable Materials Or
Reactive Metals.
-- Batteries Emit Hydrogen Gas. Keep Sparks And
Open Flame Away. Keep Battery Compartment
Open When Charging.
WARNING: Electrical Hazard
-- Disconnect Battery Cables and Charger Plug
Before Servicing Machine.
-- Do Not Charge Batteries with Damaged Power
Supply Cord. Do Not Modify Plug.
If the charger supply cord is damaged or broken, it
must be replaced by the manufacturer or its
service agent or a similarly qualified person in
order to avoid a hazard.
FOR SAFETY:
1. Do not operate machine:
-- With flammable liquids or near flammable
vapors as an explosion or flash fire may
occur.
-- Unless trained and authorized.
-- Unless operator manual is read and
understood.
-- If not in proper operating condition.
-- Unless mentally and physically capable of
following machine instructions.
-- In areas that are too dark to safely see the
controls or operate the machine.
2. Before starting machine:
-- Check machine for fluid leaks.
-- Make sure all safety devices are in place
and operate properly.
3. When using machine:
-- Go slow on inclines and slippery surfaces.
-- Wear non--slip shoes.
-- Reduce speed when turning.
-- Report machine damage or faulty operation
immediately.
-- Never allow children to play on or around.
-- Do not operate on inclines that exceed 5%.
-- Follow mixing, handling and disposal
instructions on chemical containers.
-- Follow safety guidelines concerning wet
floors.
4. Before leaving or servicing machine:
-- Stop on level surface.
-- Turn off machine.
-- Set parking brake, if equipped.
-- Remove key.
5. When servicing machine:
-- Avoid moving parts. Do not wear loose
clothing, jewelry and secure long hair.
-- Disconnect battery connections before
working on machine.
-- Wear protective gloves and eye protection
when handling batteries or battery cables.
-- Avoid contact with battery acid.
-- Wear protective gloves and eye protection
when handling white vinegar.
-- Do not power spray or hose off machine.
Electrical malfunction may occur.
-- All work must be done with sufficient
visibility and lighting.

OPERATION
4Nobles Speed Scrub Orbital (12--2012)
-- Wear personal protection equipment as
needed and where recommended in this
manual.
-- Wear a dust mask, protective glasses and
gloves in dusty environments.
-- Keep work area well ventilated.
-- Use manufacturer supplied or approved
replacement parts.
-- All repairs must be performed by a
qualified service person.
-- Do not modify the machine from its original
design.
6. When transporting machine by use of truck or
trailer:
-- Drain tanks before loading.
-- Use a ramp that can support the machine
weight and person loading it. Do not
exceed a 15% ramp incline at a ramp length
of 12 ft (3.7m).
-- Turn machine off.
-- Put scrub head in the lowered position.
-- Block machine wheels.
-- Use tie--down straps to secure machine.
-- Set parking brake, if equipped.
SAFETY LABELS
The safety labels appear on the machine in the locations indicated. Replace labels if they are missing or become
damaged or illegible.
BATTERY CHARGE LABEL --
Located on bottom side of recovery tank.
WARNING: Fire Or Explosion
Hazard. Batteries Emit Hydrogen
Gas. Keep Sparks And Open Flame
Away. Keep Battery Compartment
Open When Charging.
WARNING LABEL -- Located on recovery tank cover.

OPERATION
Nobles Speed Scrub Orbital (12--2012) 5
MACHINE COMPONENTS
2
8
5
9
4
10
13
3
6
20
21
19
15
18
17
7
11
16
14
1
12
22
12
12
1. Adjustable Control Handle
2. Control Console Panel
3. Recovery Tank Drain Hose
4. Squeegee Lift Lever
5. Down Pressure Lever
6. Hose Fill-Port
7. Solution Tank Sight Gauge/Drain Hose
8. Scrub Head Lift Pedal
9. Squeegee Assembly
10. Solution Flow Control Knob
11. Solution Tank filter
12. Wall Rollers
13. On--Board Battery Charger
14. ec--H2O System Module (ec--H2O Model)
15. Recovery Tank Support Stand
16. Batteries
17. Solution Tank/Bucket Fill Port
18. Recovery Tank
19. Recovery Tank Cover
20. Cup Holder
21. Parking Brake (option)
22. Scrub Head

OPERATION
6Nobles Speed Scrub Orbital (12--2012)
CONTROL PANEL COMPONENTS
5
2
6
9
1
2
4
3
7
8
10
11
1. Reverse Trigger
2. Start Triggers
3. Battery Meter
4. Speed Control Knob
5. Control Console Height Adjustment Lever
6. Emergency Stop Button (option)
7. Main Power On/Off Key Switch
8. Hour Meter
9. Pad Motor Circuit Breaker Button
10. ec--H2O System On/Off Switch (ec--H2O Model)
11. ec--H2O System Indicator Light (ec--H2O Model)

OPERATION
Nobles Speed Scrub Orbital (12--2012) 7
MACHINE INSTALLATION
UNCRATING MACHINE
1. Carefully check the shipping crate for signs of
damage. Report damages at once to carrier.
2. Check the contents list. Contact distributor for
missing items.
Contents:
D2--12 V Batteries -- Optional
D24V Battery Charger -- Optional
D3--Foam Battery Spacers (#630375)
DBattery Tray (#1012994)
D15 in / 38 cm Battery Cable (#130364)
D4--Battery Cable Rubber Boots
DSqueegee Assembly (#9001178)
3. To uncrate your machine, remove the shipping
hardware and straps that secure the machine to
the pallet. With assistance, carefully lift the
machine off the pallet.
ATTENTION: Do not roll machine off pallet unless a
ramp is used, machine damage may occur.
ATTENTION: To prevent possible machine damage,
install batteries after removing machine from
shipping pallet.
INSTALLING BATTERIES
WARNING: Fire Or Explosion Hazard.
Batteries Emit Hydrogen Gas. Keep Sparks And
Open Flame Away. Keep Battery Hood Open When
Charging.
FOR SAFETY: When servicing machine, wear
protective gloves and eye protection when
handling batteries and battery cables. Avoid
contact with battery acid.
Recommended Battery Specifications:
Two 12 volt deep cycle lead acid batteries.
155 AH battery -- 20 in / 50cm
Maximum battery dimensions: 6.85 in / 174 mm W x 15
in/380mmLx11.18in/284mmH.
1. Park the machine on a level surface, remove the
key and set the parking brake if equipped.
2. Lift the recovery tank to access the battery
compartment (Figure 1).
FIG. 1
3. Carefully install the batteries into the battery
compartment tray and arrange the battery posts as
shown (Figure 2). Insert the foam spacers as
shown.
4. Connect the battery cables to the battery posts as
shown (Figure 2). RED TO POSITIVE (+) and
BLACK TO NEGATIVE (--).
Machine Front
RED
BLK
105AH, 130AH 155AH
RED
BLK
Foam Spacers
105 AH
FIG. 2
IMPORTANT: Make sure that the charger is
properly set for your battery type before charging
(See USING THE ON--BOARD BATTERY CHARGER
on page 16).

OPERATION
8Nobles Speed Scrub Orbital (12--2012)
HOW THE MACHINE WORKS
Conventional Scrubbing:
Water and detergent from the solution tank flow to the
floor through a manually controlled solution valve. The
pad uses the detergent and water solution to scrub the
floor clean. As the machine moves forward, the
squeegee wipes the dirty solution from the floor into the
recovery tank.
ec- H2O Scrubbing (ec- H2O Model):
(ec--H2O--electrically converted water)
Normal water passes through a module where it is
oxygenated and charged with an electric current. The
electrically converted water changes into a blended
acidic and alkaline solution forming a neutral pH
cleaner. The converted water attacks the dirt, breaks it
into smaller particles, and pulls it off the floor surface
allowing the machine to easily scrub away the
suspended soil. The converted water then returns to
normal water in the recovery tank.
PAD INFORMATION
BACKER PAD (With Retaining Strips)
For best cleaning performance and to avoid damaging
the pad driver plate or floor surface, always use backer
pad (p/n 9010674) with work pads (Figure 3).
Backer pad
Work pad
Scrub head
Pad drive plate
FIG. 3
WORK PADS
For best results, use the correct work pad type for the
cleaning application. The following are recommended
work pads.
Polishing Pad (White) -- Used to maintain highly
polished or burnished floors (p/n 1205512, 10 pack).
Buffing Pad (Red) -- Used for light duty scrubbing
without removing floor finish (p/n 1205513, 10 pack).
Scrubbing Pad (Blue) -- Used for medium to
heavy--duty scrubbing. Removes dirt, spills, and scuffs
(p/n 1205514, 10 pack).
Surface Preparation Pad (Maroon) -- Used for very
aggressive chemical free removal of floor finish to
prepare the floor for re--coating
(p/n 1205515, 10 pack).

OPERATION
Nobles Speed Scrub Orbital (12--2012) 9
MACHINE SETUP
ATTACHING SQUEEGEE ASSEMBLY
1. Park the machine on a level surface, remove the
key and set the parking brake if equipped.
2. Lift the squeegee lift lever to the upward position
(Figure 4).
FIG. 4
3. Mount the squeegee assembly to the squeegee
pivot bracket as shown (Figure 5). Make sure the
knobs are completely seated into the slots before
securing knobs.
FIG. 5
4. Connect the vacuum hose to the squeegee
assembly. Loop the hose as shown using the hose
clip provided (Figure 6).
FIG. 6
5. Check the squeegee blades for proper adjustment
(See SQUEEGEE BLADE ADJUSTMENT on
page 22).
INSTALLING PAD
FOR SAFETY: Before installing pad, stop machine
on level surface, remove key and set parking brake
if equipped.
1. Park the machine on a level surface and remove
the key.
2. Step down on the scrub head lift pedal to raise the
scrub head off the floor (Figure 7).
FIG. 7
3. Align the backer pad with the four edges of the
scrub head and install the backer pad onto the
bottom of the scrub head (Figure 8).
FIG. 8

OPERATION
10 Nobles Speed Scrub Orbital (12--2012)
4. Install the work pad onto the backer pad
(Figure 9).
FIG. 9
FILLING SOLUTION TANK
The machine is equipped with a hose fill--port at the
rear of the machine, and a bucket fill--port located at
the front of the machine (Figure 10).
Fillthesolutiontanktothe“44LMAX”levelonthe
solution tank sight gauge (Figure 10).
For Conventional Scrubbing: Use hot water (60C
maximum). Pour a recommended cleaning detergent
into the solution tank according to mixing instructions
on the container.
FOR ec- H2O SCRUBBING: Use cool clean water only
(<21C). Do not add any conventional floor cleaning
detergents, system failure may result.
FIG. 10
NOTE: When filling the solution tank with a bucket,
make sure that the bucket is clean. Do not use the
same bucket for filling and draining the machine.
ATTENTION: For Conventional Scrubbing, only use
commercially approved cleaning detergents.
Machine damage due to improper detergent usage
will void the manufacturer’s warranty.
WARNING: Fire or Explosion Hazard.
Never Use Flammable Liquids.
FOR SAFETY: When using machine, follow mixing,
handling and disposal instructions on chemical
containers.

OPERATION
Nobles Speed Scrub Orbital (12--2012) 11
ADJUSTING CONTROL CONSOLE HEIGHT
Pull the control console height adjustment lever and lift
or lower the console to a comfortable operating height.
Release lever to lock in position (Figure 11).
FIG. 11
MACHINE OPERATION
FOR SAFETY: Do not operate machine, unless
operator manual is read and understood.
WARNING: Fire Or Explosion Hazard. Never
Operate Machine In Or Near Flammable Liquids,
Vapors Or Combustible Dusts.
PRE--OPERATION CHECKS
-Sweep and dust-mop the floor.
-Check the battery meter charge level (See
BATTERY METER on page 14).
-Check the pad for wear.
-Check the squeegee blades for wear and proper
adjustment.
-Make sure the recovery tank is empty and the float
shut--off screen is installed and clean.
-Check the scrub head skirt for wear.
-For ec- H2O Scrubbing: Make sure the solution
tank is filled with cool clean water only.
-For ec- H2O Scrubbing: Ensure that all
conventional cleaning agents are drained and
rinsed from solution tank.
STARTING THE MACHINE
1. Release the parking brake if equipped (Figure 12).
2. Turn the main power key switch to the on ( I )
position (Figure 12).
FIG. 12
3. ec- H2O Model: Press the ec--H2O system switch
to the on ( I ) position (Figure 13).
NOTE: The ec--H2O system indicator light will not turn
on until the machine starts scrubbing.
IMPORTANT: NEVER turn the ec--H2O system switch
on when conventional scrubbing. Conventional cleaning
detergents/restorers may cause failure to the ec--H2O
solution system. Drain, rinse and refill solution tank with
cool clean water before operating the ec--H2O system.
FIG. 13

OPERATION
12 Nobles Speed Scrub Orbital (12--2012)
4. Lower the squeegee assembly to floor by lowering
the squeegee lift lever (Figure 14). The vacuum
motor will automatically turn on.
FIG. 14
5. Lower the scrub head to the floor by stepping on
the scrub head lift pedal as shown (Figure 15).
FIG. 15
6. Pull the triggers to start scrubbing (Figure 16). The
machine will begin to propel forward. Pull the
reverse trigger to reverse the machine.
FIG. 16
7. Adjust the speed control knob to a desired
scrubbing speed (Figure 17).
NOTE: 45--60 meters per minute is the recommended
scrubbing speed.
FIG. 17
8. For conventional scrubbing, turn the solution flow
control knob to a desired flow rate (Figure 18).
NOTE: For the ec--H2O models, the solution flow rate
is fixed and requires no adjustment. The ec--H2O
module has optional flow rate settings. If solution flow
adjustments are required, contact an Authorized
Service Center.
FIG. 18
9. When more pad pressure is needed for heavily
soiled areas simply lift the down pressure lever
(Figure 19).
FIG. 19
10. To stop scrubbing, release the triggers, raise the
scrub head and the squeegee and turn the key to
the off position.

OPERATION
Nobles Speed Scrub Orbital (12--2012) 13
EMERGENCY STOP BUTTON (OPTION)
Strike the emergency stop button, if equipped, in the
event of an emergency (Figure 20). This button shuts
off all power to machine. Turn the button clockwise and
restart the key to regain power.
FIG. 20
WHILE OPERATING MACHINE
WARNING: Fire Or Explosion Hazard. Do Not
Pick Up Flammable Materials Or Reactive Metals.
FOR SAFETY: When using machine, go slow on
inclines and slippery surfaces. Wear non--slip
shoes.
1. Overlap each scrubbing path by 2 in / 5 cm.
2. Keep the machine moving to prevent damage to
floor finish.
3. Wipe the squeegee blades with a cloth if blades
leave streaks. Pre-sweep the area to prevent
streaking.
4. Do not operate the machine on inclines that
exceed 5%.
5. Conventional scrubbing: Pour a commercially
approved foam control solution into the recovery
tank if excessive foam appears.
ATTENTION: Do not allow foam to enter the float
shut-off screen, vacuum motor damage will result.
Foam will not activate the float shut-off screen.
6. For heavily soiled areas, use the double scrubbing
method. First scrub the area with the squeegee up,
let solution set for 3--5 minutes, then scrub the area
a second time with the squeegee down.
7. When leaving the machine unattended, remove the
key and set the parking brake, if equipped.
8. If the machine detects a fault, the battery meter will
blink a fault code (See BATTERY METER LED
FAULT CODES on page 27).
9. ec- H2O Model: If an alarm sounds and the
ec--H2O system indicator light begins to blink red,
the ec--H2O module must be flushed to resume
ec--H2O operation (See ec--H2O MODULE FLUSH
PROCEDURE) (Figure 21).
NOTE: When the alarm sounds and the light blinks
red, the machine will bypass the ec--H2O system.
To continue scrubbing, turn the ec--H2O switch off
and change over to conventional scrubbing.
ATTENTION: (ec- H2O model) Do not allow solution
tank to run dry. ec- H2O module failure may result
if operated without water for an extended period.
FIG. 21
ec- H2O SYSTEM
INDICATOR LIGHT CODE CONDITION
Solid green Normal operation
Blinking red Flush ec--H2O module
Solid red Contact Service Center
7. Use caution when working near the tile cove
(Figure 22) and floor mounted fixtures such as
pedestal sinks and other breakable items. Keep the
metal scrub head edge away to avoid possible
damage to the cove and other breakable items.
Tile Cove
FIG. 22

OPERATION
14 Nobles Speed Scrub Orbital (12--2012)
BATTERY METER
The battery meter displays the charge level of the
batteries. When the batteries are fully charged, all
indicator lights will glow. As the batteries discharge, the
indicator lights will begin to go out from right to left.
NOTE: To prolong the life of the batteries ONLY
recharge the batteries when the machine is used for a
total of 30 minutes or more.
When the discharge level reaches the last red light
(Figure 23), stop scrubbing and recharge the batteries.
If you continue to operate the machine beyond the first
red light, the scrubbing function will automatically shut
off when the last red light begins to blink. This protects
the batteries from total discharge. Drive the machine to
the charging area and recharge the batteries
immediately.
NOTE: The battery meter also displays machine fault
codes. If a fault is detected the LED bars will flash
specific fault codes (See BATTERY METER LED
FAULT CODES on page 29).
Stop scrubbing and
recharge batteries
FIG. 23
CIRCUIT BREAKER / FUSES
The machine is equipped with a resettable circuit
breaker to protect the pad motor from damage. The
circuit breaker button is located on the control panel
(Figure 24). If the circuit breaker should trip, determine
the cause, allow the motor to cool, and then manually
reset the circuit breaker button.
The machine is also equipped with three fuses located
inside the control console: 30A Main fuse, 25A vacuum
motor fuse, and a 10A ec--H2O pump fuse. When
replacing a fuse never substitute a higher Amp rated
fuse than specified.
Contact an Authorized Service Center for machine
repairs.
FIG. 24
HOUR METER
The hour meter records the number of total hours the
motor has been powered on. Use the hour meter to
determine when to perform recommended maintenance
procedures and to record service history (Figure 25).
FIG. 25

OPERATION
Nobles Speed Scrub Orbital (12--2012) 15
DRAINING TANKS
After each use, the tanks should be drained and cleaned.
FOR SAFETY: Before leaving or servicing machine,
stop on level surface, turn off machine and remove
key.
DRAINING RECOVERY TANK
1. Transport machine to disposal area and turn key
switch off.
2. While holding the drain hose upward, remove the
cap and lower hose to drain (Figure 26).
FIG. 26
NOTE: When using a bucket to drain the machine, do
not use the same bucket to fill the solution tank.
3. Remove the recovery tank cover and rinse out the
tank (Figure 27).
FIG. 27
4. Clean the float shut-off screen located in the
recovery tank (Figure 28).
FIG. 28
DRAINING SOLUTION TANK
To drain any remaining water from the solution tank,
pull the solution tank level hose off the hose fitting
(Figure 29).
FIG. 29

OPERATION
16 Nobles Speed Scrub Orbital (12--2012)
CHARGING BATTERIES
The following charging instructions are intended for
battery chargers supplied with the machine.
ATTENTION: To prolong the life of the batteries
only recharge the batteries if the machine was
used for a total of 30 minutes or more. Do not leave
batteries discharged for lengthy periods.
WARNING: Fire Or Explosion Hazard.
Batteries Emit Hydrogen Gas. Keep Sparks and
Open Flame Away. Keep Battery Compartment
Propped Open When Charging.
FOR SAFETY: When servicing batteries, wear
protective gloves and eye protection when
handling batteries and battery cables. Avoid
contact with battery acid.
BATTERY CHARGER SPECIFICATIONS:
SCHARGER TYPE:
-- FOR SEALED (Gel) BATTERIES
-- FOR WET (Lead Acid) BATTERIES
SOUTPUT VOLTAGE - 24 VOLTS
SOUTPUT CURRENT - 11 AMPS
SAUTOMATIC SHUTOFF CIRCUIT
SFOR DEEP CYCLE BATTERY CHARGING
USING THE ON--BOARD BATTERY CHARGER
IMPORTANT: Make sure the charger profile is
properly set for your battery type before charging.
Failure to properly set will result in battery
damage.
To determine your battery type, see battery label.
Contact your battery supplier if not specified.
To verify the setting of the charger profile, connect the
charger cord into an electrical receptacle. If the LED
labeled “GEL” is on, the charger is set for Gel (sealed)
batteries. If the LED is off, the charger is set for
Wet/lead acid (flooded) batteries (Figure 30).
GEL LED
FIG. 30
To change the charger profile, unplug the charger,
remove the “Charger Profile Selection” panel and
position the switch towards the proper setting, “GEL” or
“Flooded” (Figure 31).
Charger Profile
Switch
FIG. 31
1. Transport the machine to a well--ventilated area for
charging.
2. Park the machine on a flat, dry surface. Turn the
key off and set the parking brake, if equipped.
3. If charging wet (lead acid) batteries check the fluid
level before charging (See BATTERY
MAINTENANCE on page 22).
4. Connect the charger cord into a properly grounded
electrical receptacle (Figure 32). The charger will
start automatically within a few seconds. The LEDs
will display the charging state as described in the
following table.
NOTE: The machine will not operate once the battery
charger is connected.
Charging State
LED Display
FIG. 32

OPERATION
Nobles Speed Scrub Orbital (12--2012) 17
CHARGING STATE LED DISPLAY
Charging State 50% LED 75% LED 100% LED
0--50% charged Blinking Off Off
50--75% charged On Blinking Off
75--100% charged On On Blinking
100% charged On On On
Abnormal Cycle* Off Off Blinking
Fault detected * Blinking Blinking Blinking
* See the On--board Battery Charger Fault Codes table. When
a fault occurs, the charger will also sound an alarm.
5. Prop up the recovery tank for ventilation when
charging (Figure 33).
FIG. 33
6. Once the batteries are fully charged, the charger
will stop suppling power, but will continue to
monitor the battery voltage. The charger will restart
if the batteries self--discharge.
NOTE: The charger may take up to 30 seconds to turn
off once the charger cord is disconnected. During this
time, the machine will not power up.
The charger cord must also be disconnected for 30
seconds before the charger can be restarted.
ON--BOARD BATTERY CHARGER FAULT CODES
Blinking LEDs
LED FAULT CODE FAULT SOLUTION
3 LED’s blink once
repeatedly
Loose charger cable connection. Check charger cable connection.
Loose or damaged battery cable. Check battery cable connections.
Defective Battery. Replace battery.
3 LEDs blink twice
repeatedly
Input voltage is out of range. Try using a different wall outlet.
3LEDsblinkthree
times repeatedly
Safety thermostat exceeded maximum internal
temperature.
Open battery compartment to promote air
circulation or move machine to a cooler cli-
mate.
3LEDsblinkfour
times repeatedly
Output current exceeds a limit. Disconnect charger cord, wait 30 seconds,
then plug back in. If fault continues replace
charger or Contact Service Center.
100% LED blinks
while the 50% and
75% LEDs are off.
Abnormal cycle. Safety timer exceeded the 18
hour charging time.
Battery maintenance required or replace
battery.

MAINTENANCE
18 Nobles Speed Scrub Orbital (12--2012)
MACHINE MAINTENANCE
To keep the machine in good working condition, simply
follow the daily, monthly and quarterly maintenance
procedures.
WARNING: Electrical Hazard. Disconnect
Battery Cables Before Servicing Machine.
FOR SAFETY: When servicing machine, wear
personal protection equipment as needed and
where recommended in this manual.
DAILY MAINTENANCE (After Every Use)
1. Drain and rinse out the recovery tank (Figure 34).
FIG. 34
2. Remove and clean the float shut--off screen located
in the recovery tank (Figure 35).
FIG. 35
3. Drain the solution tank and rinse out the inside with
hot water, 60C maximum temperature, as needed
(Figure 36)
FIG. 36
4. Turn the work pad over or replace when worn
(Figure 37).
FIG. 37
5. Wipe the squeegee blades clean (Figure 38). Store
the squeegee assembly in the raised position to
prevent blade damage.
FIG. 38

MAINTENANCE
Nobles Speed Scrub Orbital (12--2012) 19
6. Check the condition of the squeegee blade wiping
edge (Figure 39). Rotate blade if worn
(See SQUEEGEE BLADE REPLACEMENT on
page 21).
FIG. 39
7. Clean the machine with an all purpose cleaner and
damp cloth (Figure 40).
FOR SAFETY: When cleaning machine, do not
power spray or hose off machine. Electrical
malfunction may occur.
FIG. 40
10. Recharge the batteries. To prolong the life of the
batteries, only recharge the batteries if machine
was used for a total of 30 minutes or more
(Figure 41).
FIG. 41
MONTHLY MAINTENANCE
1. Remove the solution tank filter from underneath the
machine and rinse out the screen (Figure 42).
Make sure the solution tank is empty before
removing filter.
FIG. 42
2. Clean the battery tops to prevent corrosion (See
BATTERY MAINTENANCE on page 22).
3. Check for loose battery cable connections.
4. Inspect and clean the recovery tank cover seal
(Figure 43). Replace if damaged.
FIG. 43
5. Lubricate all pivot points and rollers with a water
resistant grease.
6. If equipped, clean the parking brake clamp with a
cleaning solvent.
7. Check the machine for loose nuts and bolts.
8. Check the machine for leaks.

MAINTENANCE
20 Nobles Speed Scrub Orbital (12--2012)
MOTOR MAINTENANCE
Contact an Authorized Tennant Service Center for
carbon brush replacement.
Carbon Brush Replacement Hours
Drive Transaxle Motor 750
Vacuum Motor 750
Pad Motor 1200
WARNING: Electrical Hazard. Disconnect
Battery Cables Before Servicing Machine.
ec- H2O MODULE FLUSH PROCEDURE
This procedure is only required when an alarm sounds
and the ec--H2O system indicator light begins to blink
red.
1. Drain the solution tank and recovery tank of all
water.
2. Pour 1 gallon (4 liters) of white or rice vinegar into
the solution tank at full strength. Do not dilute.
NOTE: Use white or rice vinegar only. The acidity
level should be between 4--8%. Do not use other acids
for this procedure.
FOR SAFETY: When servicing machine, wear
protective gloves and eye protection when
handling vinegar.
3. Disconnect the black connector fitting at the scrub
head and place the hose into a bucket (Figure 44).
To access the connector fitting, you may have to
remove the front cover from the machine.
FIG. 44
4. Turn the key to the on ( I ) position.