Nobles SPEED SCRUB User manual

ENGLISH
®
1033583
Rev. 01 (10-2007)
17 in / 20 in AUTOMATIC SCRUBBER
*1033583*
The Safe Scrubbing Alternativer
®
www.nobles.com
OPERATOR MANUAL
SPEED SCRUB

OPERATION
2Nobles Speed Scrub 17 -- 20 (03--07)
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.
A complete illustrated Parts Manual is also furnished
with each new model. Use the Parts Manual to order
replacement parts. To ensure prompt delivery, follow
the “HOW TO ORDER PARTS” instructions printed in
the Parts Manual.
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.
PROTECT THE ENVIRONMENT
Please dispose of packaging materials,
old machine components such as
batteries, hazardous fluids such as
antifreeze and oil, in an
environmentally safe way according to
local waste disposal regulations.
Always remember to recycle.
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.
Copyright E2007 TENNANT Company. All rights reserved.
PrintedinChina
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 --

OPERATION
Nobles Speed Scrub 17 -- 20 (03--07) 3
TABLE OF CONTENTS
SAFETY PRECAUTIONS 4....................
SAFETY LABELS 5...........................
MACHINE COMPONENTS 6...................
CONTROL PANEL COMPONENTS 7...........
MACHINE INSTALLATION 8...................
UNCRATING MACHINE 8..................
INSTALLING BATTERIES 8................
HOW THE MACHINE WORKS 9...............
BRUSH AND PAD INFORMATION 9............
MACHINE SETUP 9..........................
ATTACHING SQUEEGEE ASSEMBLY 9.....
INSTALLING BRUSH/PAD DRIVER 10........
INSTALLING FaST--PAK CARTON 11.........
FILLING SOLUTION TANK 11...............
ADJUSTING CONTROL CONSOLE HEIGHT 12
MACHINE OPERATION 12.....................
PRE--OPERATION CHECKS 12..............
STARTING THE MACHINE 12...............
EMERGENCY STOP BUTTON (OPTION) 13..
WHILE OPERATING MACHINE 14...........
BATTERY METER 14.......................
CIRCUIT BREAKER / FUSES 14.............
HOUR METER 15..........................
DRAINING TANKS 15..........................
DRAINING RECOVERY TANK 15............
DRAINING SOLUTION TANK 16.............
CHARGING BATTERIES 16....................
BATTERY CHARGER SPECIFICATIONS: 16..
USING THE ON--BOARD
BATTERY CHARGER 16...................
ON--BOARD BATTERY CHARGER
FAULT CODES 17..........................
USING THE OFF--BOARD
BATTERY CHARGER 18...................
MACHINE MAINTENANCE 18..................
DAILY MAINTENANCE 18...................
MONTHLY MAINTENANCE 20...............
MOTOR MAINTENANCE 20.................
FaST SYSTEM MAINTENANCE 21...........
SQUEEGEE BLADE REPLACEMENT 21......
SQUEEGEE BLADE ADJUSTMENT 22.......
BATTERY MAINTENANCE 22...............
TRANSPORTING MACHINE 23.................
STORING MACHINE 23........................
FREEZE PROTECTION 23..................
RECOMMENDED STOCK ITEMS 24.............
TROUBLESHOOTING 25.......................
BATTERY METER LED FAULT CODES 26.......
MACHINE SPECIFICATIONS 27................
MACHINE DIMENSIONS 28....................

OPERATION
4Nobles Speed Scrub 17 -- 20 (03--07)
SAFETY PRECAUTIONS
This machine is intended for commercial use. It is
designed exclusively to scrub hard floors in an
indoor environment and is not constructed for any
other use. Only use recommended pads, brushes
and commercially approved floor cleaners
intended for machine application.
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.
WARNING: Spinning Brush. Keep Hands
Away. Turn Off Power Before Working On Machine.
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.
2. Before starting machine:
-- 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.
-- Follow mixing and handling instructions on
chemical containers.
-- Do not operate on inclines that exceed 5%
(3°).
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
jackets, shirts, or sleeves.
-- Disconnect battery connections before
working on machine.
-- Wear protective gloves and eye protection
when handling batteries or battery cables.
-- Avoid contact with battery acid.
-- Do not power spray or hose off machine.
Electrical malfunction may occur.
-- 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.

OPERATION
Nobles Speed Scrub 17 -- 20 (03--07) 5
6. When transporting machine by use of truck or
trailer:
-- Drain tanks before loading.
-- Use a recommended ramp when
loading/unloading into/off truck or trailer.
-- Do not lift machine when batteries are
installed.
-- Get assistance when lifting machine.
-- Turn machine off.
-- Put scrub head in the lowered position.
-- 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.
SPINNING BRUSH LABEL --
Located on scrub head
WARNING: Spinning Brush.
Keep Hands Away. Turn Off
Power Before Working On
Machine.
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
6Nobles Speed Scrub 17 -- 20 (03--07)
MACHINE COMPONENTS
2
8
5
9
4
10
13
3
6
20 21
19
15
18
17
7
11
16
23
25
26
14
24
1
12
22
1. Adjustable Control Handle
2. Control Console Panel
3. Recovery Tank Drain Hose
4. Squeegee Lift Lever
5. Battery Charge Receptacle
6. Hose Fill-Port
7. Solution Tank Sight Gauge/Drain Hose
8. Down Pressure Lever
9. Scrub Head Lift Pedal
10. Squeegee Assembly
11. Solution Flow Control Knob
12. Solution Tank filter
13. Wall Rollers
14. On--board Battery Charger
15. Recovery Tank Support Stand
16. Batteries
17. Solution Tank/Bucket Fill Port
18. FaST--PAK Concentrate (FaST Model)
19. Recovery Tank
20. Recovery Tank Cover
21. Cup Holder
22. Scrub Head
23. Scrub Head Skirt
24. Scrub Head Window
25. Motor Hub Lock Pin
26. Parking Brake (option)

OPERATION
Nobles Speed Scrub 17 -- 20 (03--07) 7
CONTROL PANEL COMPONENTS
5
2
6
10
1
2
9
4
3
7
8
1. Reverse Trigger
2. Start Triggers
3. Battery Meter
4. Speed Control Knob (drive model)
5. Control Console Height Adjustment Lever
6. Emergency Stop Button (option)
7. Main Power on/off Key Switch
8. Hour Meter
9. FaST System on/off Switch (option)
10. Brush Motor Circuit Breaker Button

OPERATION
8Nobles Speed Scrub 17 -- 20 (03--07)
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
D1--FaST--PAK MP Concentrate (#1017019)
(FaST Model)
DSqueegee Assembly (#9001178)
DPad Driver -- Optional
Brushes and pads must be purchased separately.
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.
105 AH battery -- 17 in / 43cm Brush Assist Model
130 AH battery -- 20 in / 50cm Brush Assist Model
155 AH battery -- 20 in / 50cm Drive Model
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: If your machine is equipped with the
on--board battery charger, make sure that the
charger is properly set for your battery type before
charging (See USING THE ON--BOARD CHARGER
on page 16).

OPERATION
Nobles Speed Scrub 17 -- 20 (03--07) 9
HOW THE MACHINE WORKS
Conventional Scrubbing:
Water and detergent from the solution tank flow to the
floor through a manually controlled solution valve. The
brush 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.
Foam Scrubbing (FaST Model):
(FaST-- Foam activated Scrubbing Technology)
Unlike conventional scrubbing, the FaST system injects
the FaST--PAK concentrate formula with a small
amount of water and air onto the floor. The mixture
creates a large volume of expanded wet foam for the
brush to scrub the floor clean. As the machine moves
forward, the foam collapses and the squeegee
recovers the dirty solution into the recovery tank
leaving the floor clean, dry and slip free.
BRUSH AND PAD INFORMATION
For best results, use the correct brush type for the
cleaning application. The following are recommended
brushes and pads.
Polypropylene Bristle Scrub Brush (Black) --
Part No. 1016765 -- 17 in / 43 cm
Part No. 1016811 -- 20 in / 50 cm
This general purpose polypropylene bristle scrub brush
is used for scrubbing lightly compacted soilage. This
brush works well for maintaining concrete, wood and
grouted tile floors.
Soft Nylon Bristle Scrub Brush (White) --
Part No. 1016764 -- 17 in / 43 cm
Part No. 1016810 -- 20 in / 50 cm
Recommended for cleaning coated floors without
removing finish. Cleans without scuffing.
Super Abrasive Bristle Scrub Brush (Gray) --
Part No. 1016763 -- 17 in / 43 cm
Part No. 1016805 -- 20 in / 50 cm
Nylon fiber impregnated with abrasive grit to remove
stains and soilage. Strong action on any surface.
Performs well on buildup, grease, or tire marks.
Polishing Pad (White) --
Used to maintain highly polished or burnished floors.
Buffing Pad (Red) --
Used for light duty scrubbing without removing floor
finish.
Scrubbing Pad (Blue) --
Used for medium to heavy--duty scrubbing. Removes
dirt, spills, and scuffs and leaves surface clean ready
for recoating.
Stripping Pad (Brown) --
Used for stripping of floor finish to prepare the floor for
recoating.
Heavy Duty Stripping Pad (Black) --
Used for aggressive stripping of heavy finishes/sealers,
or very heavy duty scrubbing.
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 3).
FIG. 3
3. Mount the squeegee assembly to the squeegee
pivot bracket as shown (Figure 4). Make sure the
knobs are completely seated into the slots before
securing knobs.
FIG. 4
4. Connect the vacuum hose to the squeegee
assembly. Loop the hose as shown using the hose
clip provided (Figure 5).

OPERATION
10 Nobles Speed Scrub 17 -- 20 (03--07)
FIG. 5
5. Check the squeegee blades for proper adjustment
(See SQUEEGEE BLADE ADJUSTMENT on page
22).
INSTALLING BRUSH/PAD DRIVER
FOR SAFETY: Before installing brushes or pad
drivers, 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 6).
FIG. 6
3. Attach the pad to the pad driver before installing
pad driver (Figure 7). Secure pad with center lock.
Pad Driver
FIG. 7
4. Turn the brush motor hub until the slot with the
spring clip is visible through the scrub head
window (Figure 8).
Spring Clip
FIG. 8
5. Align the pad driver/brush mounting studs into the
motor hub slots and turn the pad driver/brush
counter--clockwise until stud is fully seated in
spring clip (Figure 9). If necessary, press down on
the motor hub lock pin to lock motor hub in place
(Figure 10).
Spring Clip
Pad Driver/Brush
Mounting Stud
Motor Hub
Slot
FIG. 9
6. To remove the pad driver/ brush, press down on
the motor hub lock pin and turn the pad
driver/brush clockwise (Figure 10).
Lock Pin
FIG. 10

OPERATION
Nobles Speed Scrub 17 -- 20 (03--07) 11
INSTALLING FaST--PAK CARTON (FaST Model)
ATTENTION: The FaST--PAK Concentrate Formula
is specifically designed for the FaST system.
NEVER use a substitute, machine damage may
result.
1. Remove the perforated knock-out from the
FaST--PAK carton. Do not remove the bag from the
carton. Pull the hose connector through the
knock--out and remove the orange cap
(Figure 11).
FOR SAFETY: When using machine, always follow
the handling instructions on chemical container.
FIG. 11
2. Lift the recovery tank to access the FaST--PAK
compartment. Connect the supply hose to the
FaST--PAK and place carton into the compartment
as shown (Figure 12). Make sure that the supply
hose doesn’t get kinked or pinched.
NOTE: If any dried concentrate is visible on the supply
hose connector or on the FaST-- PAK connector, soak
and clean with warm water.
FIG. 12
3. When the supply hose is not in use, make sure to
connect it to the storage plug (Figure 13). This will
prevent the FaST system from drying out and
clogging up the supply hose.
FIG. 13
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 14).
Fillthesolutiontanktothe“44LMAX”levelonthe
solution tank sight gauge (Figure 14).
FOR FaST SCRUBBING: Use cool clean water only
(less than 70°F/21°C). Do not add any conventional
floor cleaning detergents, FaST system failure may
result.
FOR CONVENTIONAL SCRUBBING: Use hot water
(140°F/60°C maximum). Pour a recommended
cleaning detergent into the solution tank according to
mixing instructions on the container.
FIG. 14
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
and handling instructions on chemical containers.

OPERATION
12 Nobles Speed Scrub 17 -- 20 (03--07)
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 15).
FIG. 15
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.
FIRST TIME USE (FaST Model): The FaST system is
protected against freezing during shipment. You must
operate the FaST system for 10 minutes to disperse
the mixture of RV anti--freeze/FaST concentrate before
achieving maximum foam.
PRE--OPERATION CHECKS
-Sweep and dust-mop the floor.
-Check the battery meter charge level (See
BATTERY METER on page 14).
-Check the pad/brush 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.
-Foam scrubbing (FaST Model): Check the
FaST--PAK concentrate level.
-Foam scrubbing (FaST Model): Make sure the
solution tank is filled with only cool clean water, no
detergents.
STARTING THE MACHINE
1. Release the parking brake if equipped (Figure 16).
2. Turn the main power key switch to the on ( I )
position (Figure 16).
FIG. 16
3. To foam scrub (FaST model), press the FaST
system switch to the on ( I ) position (Figure 17).
IMPORTANT: Do not activate the FaST system when
conventional scrubbing. The conventional cleaning
detergents/restorers in solution tank may cause failure
to the FaST injection system. Drain, rinse and refill
solution tank with cool clean water before operating the
FaST system.
FIG. 17
4. Lower the squeegee assembly to floor by lowering
the squeegee lift lever (Figure 18). The vacuum
motor will automatically turn on.
FIG. 18

OPERATION
Nobles Speed Scrub 17 -- 20 (03--07) 13
5. Lower the scrub head to the floor by stepping on
the scrub head lift pedal as shown (Figure 19).
FIG. 19
6. Pull the triggers to start scrubbing (Figure 20). The
drive model will begin to propel forward. To reverse
the drive model, simply pull the reverse trigger.
Drive Model--Reverse
FIG. 20
7. Drive Model: Adjust the speed control knob to a
desired scrubbing speed (Figure 21).
NOTE: 45--60 meters per minute is the recommended
scrubbing speed.
FIG. 21
8. For conventional scrubbing, turn the solution flow
control knob to a desired flow rate (Figure 22).
NOTE: FaST Model -- When using the FaST system,
the solution flow control knob is nonfunctional. The
FaST system has a set solution flow rate.
FIG. 22
9. When more brush pressure is needed for heavily
soiled areas simply lift the down pressure lever
(Figure 23).
FIG. 23
10. To stop scrubbing, release the triggers, raise the
scrub head and the squeegee and turn the key to
the off position.
EMERGENCY STOP BUTTON (OPTION)
Strike the emergency stop button, if equipped, in the
event of an emergency (Figure 24). This button shuts
off all power to machine. Turn the button clockwise and
restart the key to regain power .
FIG. 24

OPERATION
14 Nobles Speed Scrub 17 -- 20 (03--07)
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% (3°).
5. 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. Drive Model: If the machine detects a fault, the
battery meter will blink a fault code (See BATTERY
METER LED FAULT CODES on page 26).
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.
DRIVE MODEL: When the discharge level reaches the
first red light (Figure 25), 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 Drive Model 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 26).
Stop scrubbing and recharge batteries
FIG. 25
BRUSH ASSIST MODEL: When the discharge level
reaches the last yellow light (Figure 26), the light will
begin to flash, stop scrubbing and recharge the
batteries. If the red light appears, the scrubbing
function will shut off automatically. This protects the
batteries from total discharge. Recharge the batteries
immediately.
Stop scrubbing and recharge batteries
FIG. 26
CIRCUIT BREAKER / FUSES
The machine is equipped with a resettable circuit
breaker to protect the brush motor from damage. The
circuit breaker button is located on the control panel
(Figure 27). 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 (drive
model), 5A Main fuse (brush assist model), 25A
vacuum motor fuse and 7.5A FaST Pump fuse. When
replacing a fuse never substitute a higher Amp rated
fuse than specified.
Contact an Authorized Service Center for machine
repairs.

OPERATION
Nobles Speed Scrub 17 -- 20 (03--07) 15
FIG. 27
HOUR METER
The hour meter records the number of total hours the
brush motor has been powered on. Use the hour meter
to determine when to perform recommended
maintenance procedures and to record service history
(Figure 28).
FIG. 28
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 29).
FIG. 29
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 30).
FIG. 30
4. Clean the float shut-off screen located in the
recovery tank (Figure 31).
FIG. 31

OPERATION
16 Nobles Speed Scrub 17 -- 20 (03--07)
DRAINING SOLUTION TANK
To drain any remaining water from the solution tank,
pull the solution tank level hose off the hose fitting
(Figure 32).
FIG. 32
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: If your machine is equipped with the
on--board battery charger, 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 33).
GEL LED
FIG. 33
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 34).
Charger Profile
Switch
FIG. 34
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 35). The charger will
start automatically within a few seconds. The LED’s
will display the charging state as described in the
following table.
NOTE: The machine will not operate once the battery
charger is connected.

OPERATION
Nobles Speed Scrub 17 -- 20 (03--07) 17
Charging State
LED Display
FIG. 35
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 36).
FIG. 36
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 LED’s
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 LED’s blink twice
repeatedly
Input voltage is out of range. Try using a different wall outlet.
3 LED’s blink three
times repeatedly
Safety thermostat exceeded maximum internal
temperature.
Open battery compartment to promote air
circulation or move machine to a cooler
climate.
3 LED’s blink four
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% LED’s are off.
Abnormal cycle. Safety timer exceeded the 18
hour charging time.
Battery maintenance required or replace
battery.

OPERATION
18 Nobles Speed Scrub 17 -- 20 (03--07)
USING THE OFF--BOARD BATTERY CHARGER
For battery charger operating instructions, refer to
the Battery Charger Manual supplied with charger.
1. Transport the machine to a well--ventilated area.
WARNING: Fire Or Explosion Hazard.
Batteries Emit Hydrogen Gas. Keep Sparks And
Open Flame Away. Keep Battery Compartment
Open When 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. Prop up the recovery tank for ventilation when
charging (Figure 37).
FIG. 37
5. Connect the charger’s AC power supply cord to a
properly grounded receptacle.
6. Connect the charger’s DC cord to the machine’s
battery receptacle at the rear of the machine
(Figure 38).
NOTE: The machine will not operate once the battery
charger is connected.
FIG. 38
ATTENTION: Do not disconnect the charger’s DC
cord from the machine’s receptacle when the
charger is operating. Arcing may result. If the
charger must be interrupted during charging,
disconnect the AC power supply cord first.
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.
DAILY MAINTENANCE (After Every Use)
1. Drain and rinse out the recovery tank (Figure 39).
FIG. 39
2. Remove and clean the float shut--off screen located
in the recovery tank (Figure 40).
FIG. 40

OPERATION
Nobles Speed Scrub 17 -- 20 (03--07) 19
3. Drain the solution tank and rinse out the inside with
hot water, 60°C maximum temperature, as needed
(Figure 41)
FIG. 41
4. Remove the pad/brush and clean. Rotate pad or
replace when worn (Figure 42).
FIG. 42
5. Wipe the squeegee blades clean (Figure 43). Store
the squeegee assembly in the raised position to
prevent blade damage.
FIG. 43
6. Check the condition of the squeegee blade wiping
edge (Figure 44). Rotate blade if worn.
(See SQUEEGEE BLADE REPLACEMENT on
page 21)
FIG. 44
7. Clean the machine with an all purpose cleaner and
damp cloth (Figure 45).
FOR SAFETY: When cleaning machine, do not
power spray or hose off machine. Electrical
malfunction may occur.
FIG. 45
8. Inspect the condition of the scrub head skirt,
replace if worn or damaged (Figure 46).
FIG. 46
9. FaST Model: Connect the FaST--PAK supply hose
to the storage plug when not it use (Figure 47).
Remove any dried concentrate from the hose
connector by soaking it in warm water.

OPERATION
20 Nobles Speed Scrub 17 -- 20 (03--07)
FIG. 47
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
48).
FIG. 48
MONTHLY MAINTENANCE
1. Remove the solution tank filter from underneath the
machine and rinse out the screen (Figure 49).
Make sure the solution tank is empty before
removing filter.
FIG. 49
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 50). Replace if damaged.
FIG. 50
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.
MOTOR MAINTENANCE
Contact an Authorized Tennant Service Center for
carbon brush replacement.
Carbon Brush Replacement Hours
Drive Transaxle Motor 750
Vacuum Motor 750
Brush Motor 750
WARNING: Electrical Hazard. Disconnect
Battery Cables Before Servicing Machine.