Tennant 1550 Product manual

1550
Operator and Parts Manual
607758
Rev. 03 (08-2007)
www.tennantco.com
Model Part No.:
607877
608934 - Pac
610694 - Pac Can
Automatic Carpet Extractor
*607758*

OPERATION
2Tennant 1550 (08--07)
This manual is furnished with each new model. It
provides necessary operation and machine
maintenance instructions and an illustrated parts list.
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 care instructions provided.
SThe machine is maintained with manufacturer
supplied or equivalent parts.
When ordering replacement parts, use the Parts Lists
in this manual. Before ordering parts or supplies, be
sure to have your machine model number and serial
number handy. Parts and supplies may be ordered by
phone or mail from any Authorized Service Center or
Distributor.
PROTECT THE ENVIRONMENT
Please dispose of packaging materials,
old machine components such as
batteries, hazardous fluids such as
antifreeze and oil, in a safe
environmentally way according to your
local waste disposal regulations.
Always remember to recycle.
Tennant Company
PO Box 1452
Minneapolis, MN 55440
Phone: [phone] or (763) 513--2850
www.tennantco.com
Specifications and parts are subject to change without notice.
E2000, 2003, 2007 Tennant Company. All rights reserved.
Printed in U.S.A.
MACHINE DATA
Please fill out at time of installation for future reference.
Model No.-
Install. Date -
Serial No.-

OPERATION
Tennant 1550 (01--07) 3
TABLE OF CONTENTS
SAFETY PRECAUTIONS 4...................
SAFETY LABEL 5...........................
MACHINE COMPONENTS 6..................
CONTROL PANEL SYMBOLS 6..............
MACHINE INSTALLATION 7..................
UNCRATING MACHINE 7.................
INSTALLING BATTERIES 7...............
MACHINE SETUP 8.........................
FILLING SOLUTION TANK 8..............
INSTALLING SPRAY BAR 8...............
MACHINE OPERATION 9....................
PRE--OPERATION CHECKS 9.............
TRANSPORTING MACHINE 9.............
CLEANING WITH MACHINE 10............
WHILE OPERATING MACHINE 11.........
CIRCUIT BREAKER PANEL 12............
ADJUSTING BRUSH HEIGHT 12..........
OPERATING ACCESSORY TOOLS
(OPTIONAL) 12..........................
DRAINING TANKS 13........................
DRAINING RECOVERY TANK 13..........
DRAINING SOLUTION TANK 14...........
CHARGING BATTERIES 14..................
MACHINE MAINTENANCE 15................
HOUR METER 15........................
DAILY MAINTENANCE 15................
WEEKLY MAINTENANCE 16..............
MONTHLY MAINTENANCE 17.............
QUARTERLY MAINTENANCE 18..........
BATTERY MAINTENANCE 18.............
TO ACCESS INTERNAL COMPONENTS 19.
TRANSPORTING MACHINE 19...............
STORING MACHINE 20......................
RECOMMENDED STOCK ITEMS 20...........
TROUBLE SHOOTING 20....................
SPECIFICATIONS 22........................
MACHINE DIMENSIONS 22..................
ELECTRICAL DIAGRAMS 24.................
PARTS LIST 26.............................
UPPER HOUSING GROUP 26.............
MAIN CHASSIS GROUP 28...............
CONTROL CONSOLE GROUP 30.........
DRIVE GROUP 32.......................
PLUMBING SYSTEM GROUP 34..........
BRUSH HEAD GROUP 36................
SPRAY BAR GROUP 38..................
PUMP BREAKDOWN 39..................
VAC MOTOR BREAKDOWN 40............
OPTIONS 42................................
127MM (5 IN.) HAND TOOL 42............
76MM (3 IN.) CREVICE TOOL 42..........
LOW PRESSURE UPHOLSTERY TOOL 43.
330MM (13 IN.) LOW PRESSURE
FLOOR TOOL GROUP 44.................
406MM (16 IN.) LOW PRESSURE
FLOOR TOOL GROUP 46.................
SOLUTION AND VACUUM HOSES 48......

OPERATION
4Tennant 1550 (12--03)
SAFETY PRECAUTIONS
This machine is intended for commercial use. It is
designed exclusively to clean carpets and
upholstery in an indoor environment and is not
constructed for any other use. Use only
recommended accessory tools and commercially
available carpet cleaners intended for machine
application.
All operators must read, understand and practice
the following 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.
Failure to follow these warnings may result in:
personal injury, electrocution, electrical shock,
fire or explosion.
WARNING: Do Not 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.
WARNING: Do Not Pick Up Flammable
Materials Or Reactive Metals.
WARNING: Keep Sparks And Open Flame
Away. Keep Battery Hood Open When Charging.
WARNING: Disconnect Battery Cables Before
Servicing Machine.
The following information signals potentially
dangerous conditions to the operator or
equipment:
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 operation 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.
-- Use care when reversing machine.
-- Report machine damage or faulty
operation immediately.
-- Never allow children to play on or around.
-- Follow mixing and handling instructions
on chemical containers.
4. Before leaving or servicing machine:
-- Stop on level surface.
-- Turn off machine.
-- Pull out main circuit breaker button.
5. When servicing machine:
-- Avoid moving parts. Do not wear loose
jackets, shirts, or sleeves.
-- Block machine tires before jacking up.
-- Jack machine up at designated locations
only. Block machine up with jack stands.
-- Use hoist or jack that will support the
weight of the machine.
-- Disconnect battery connections before
working on machine.
-- Wear protective gloves and safety glasses
when handling batteries or battery cables.
-- Avoid contact with battery acid.
-- 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
Tennant 1550 (01--07) 5
6. When transporting machine:
-- Turn machine off.
-- Get assistance when lifting machine.
-- Do not lift machine when batteries are
installed.
-- Use a recommended ramp when
loading/unloading into/off truck or trailer.
-- Use tie--down straps to secure machine to
truck or trailer.
SAFETY LABEL
The safety label appears on the machine in the
location indicated. Replace label if it becomes
damaged or illegible.
WARNING LABEL --
LOCATED ON THE RECOVERY TANK DOME

OPERATION
6Tennant 1550 (09--03)
MACHINE COMPONENTS
1
9
2
35 6 7 8
10 411
12
13
13
14
15
17
15
16
18
19
20
21
22
24
25
23
26
27
17
28
1. Control Grips
2. Reverse Drive Trigger
3. Main Power Switch
4. Brush Pressure Meter
5. Pump Switch
6. Vacuum Switch
7. Clean Mode/Transport Mode Drive Switch
8. Restorative Cleaning/Interim Cleaning Switch
9. Transport Speed Control Knob
10. Battery Meter
11. Hour Meter
12. Circuit Breaker Panel
13. Brush Lift Lever
14. Brush Height Adjustment Knobs
15. Drain Hose
16. Floor Tool Accessory/Bleeder Hose Coupler
17. Solution Tank Fill Port
18. Solution Tank Filter
19. Wall Roller Bumper
20. Vacuum Pickup Head
21. Recovery Tank Dome
22. Rotating Brush
23. Safety Wheels
24. Battery Compartment Hood
25 Recovery Tank
26. Solution Tank Gallon Marker
27. Solution Tank
28. Standpipe Screen
CONTROL PANEL SYMBOLS
Main
Power
Vacuum
Brush
Pressure
Meter
Transport
Fast
Speed
Transport
Slow
Speed
Reverse
Main Power
Circuit
Breaker
Battery
Charge
Meter
Pump
Drive Motor
Circuit
Breaker
Brush Motor
Circuit
Breaker
Clean
Mode
Transport
Mode
Interim
Cleaning
Restorative
Cleaning
CIRCUIT BRE
A
K
ER P
A
NEL

OPERATION
Tennant 1550 (09--03) 7
MACHINE INSTALLATION
UNCRATING MACHINE
Carefully check carton for signs of damage. Report
damages at once to carrier.
Check carton contents list below. Contact your
distributor for missing items.
1 -- Recovery Dome (stored in battery
compartment)
1 -- Recovery Dome Vacuum Hose (stored in
recovery tank)
1 -- Battery Tray
2 -- Battery Cables (stored in battery
compartment)
1 -- Pumpout Hose (stored in recovery tank)
1 -- Standpipe Screen (stored in recovery tank)
1 -- Solution Tank Fill Port Strainer (stored in
recovery tank)
1 -- Spray Bar (installed on machine)
1 -- Battery Charger (included with 1550 PAC
608934 & 610694) Packaged Separately
3 -- 12V Batteries (included with 1550 PAC
608934) Packaged Separately
ATTENTION: Battery installation must be
accomplished after removing machine from
shipping crate.
ATTENTION: DO NOT roll machine off pallet or
use a forklift, machine damage will occur. Use a
hoist or ramp.
INSTALLING BATTERIES
WARNING: Keep Sparks And Open Flame
Away. Keep Battery Hood Open When Charging.
FOR SAFETY: When servicing machine, wear
protective gloves and safety glasses when
handling batteries or battery cables. Avoid contact
with battery acid.
Battery Specifications:
Three 12 volt, 215 Ah, deep cycle batteries. Consult
with an Authorized Distributor for specific batteries.
Maximum battery dimensions are 178mm (7 in) W x
380mm (15 in) L x 370mm (14.63 in) H.
1. Before installing batteries pull out the main circuit
breaker button to shut off power to machine.
Circuit breaker panel is located at rear lower right
of machine (Figure 1).
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, turn off machine
and pull out main circuit breaker button.
FIG. 1
2. Lift battery compartment hood off machine and
remove loose battery cables (Figure 2).
FIG. 2
3. Carefully install batteries into battery tray with
negative posts towards back of machine
(Figure 3).
12
3
4
RED (+)
BLK
(--)
FRONT OF MACHINE
FIG. 3

OPERATION
8Tennant 1550 (09--03)
ATTENTION: Do not drop batteries into
compartment, battery and machine housing
damage may result. This damage is not covered
by warranty.
4. Before connecting the battery cables, make sure
the terminals and posts are clean. Use a post
cleaner and wire brush if necessary.
NOTE: Apply a light coating of non-metallic grease or
protective spray on the cable connections to prevent
battery corrosion.
5. Connect cables to battery posts in numerical order
as labeled (Figure 3), RED to POSITIVE & BLACK
to NEGATIVE.
6. Double check cable connections before closing up
battery compartment.
7. Replace hood and reset the main circuit breaker
button.
8. Turn main power switch on, and check battery
meter charge level to ensure batteries are fully
charged. If batteries need charging, see
CHARGING BATTERIES.
MACHINE SETUP
FILLING SOLUTION TANK
1. Transport machine to filling station
(See MACHINE OPERATION).
2. Stop the machine on a level surface and turn off
machine.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface and turn off
machine.
3. Fill solution tank with 113.5 L (30 gal) of clean
water at fill port, 60°C (140°F) maximum
temperature. Use gallon markers on side of tank
to indicate fill level (Figure 4).
NOTE: Check that the solution tank fill port filter is
installed before filling.
FIG. 4
NOTE: When filling solution tank with a bucket, make
sure that the bucket is clean. Do not use the same
bucket for filling and emptying the machine.
4. Pour a recommended cleaning detergent into the
solution tank according to the mixing instructions
on the bottle.
FOR SAFETY: When using machine, follow mixing
and handling instructions on chemical containers.
WARNING: Do Not Use Flammable Liquids Or
Operate Machine In Or Near Flammable Liquids,
Vapors Or Combustible Dusts.
ATTENTION: Use only recommended cleaning
chemicals, DO NOT use substitutes. Consult an
authorized distributor to assist you with the
recommended cleaning chemicals.
INSTALLING SPRAY BAR
1. Turn key off and pull out ”MAIN” circuit breaker
button. Circuit breaker panel is located at rear
lower right of machine.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, turn off machine
and pull out main circuit breaker button.
2. From operators right side of machine, locate
unused quick coupler under machine.
3. Connect quick coupler to spray bar connector.
4. Align end of spray bar to spring loaded pin on side
bracket, push and position opposite end to other
bracket (Figure 5).
FIG. 5
NOTE: Be certain to position spray bar ”FRONT” label
facing forward.

OPERATION
Tennant 1550 (09--03) 9
MACHINE OPERATION
FOR SAFETY: Do not operate machine unless
operator manual is read and understood.
PRE--OPERATION CHECKS
1. Vacuum the floor and remove any debris.
2. Check battery meter charge level; machine should
be fully charged prior to using. Do not operate
machine if batteries are discharged below half
(See CHARGING BATTERIES) (Figure 6).
FIG. 6
3. Check that the recovery tank standpipe screen is
in place (Figure 7).
FIG. 7
4. Check that the solution tank filter is installed
(Figure 8).
FIG. 8
5. Check that the spray bar is installed (Figure 9).
FIG. 9
6. Inspect the spray tips for proper spray pattern
(See WEEKLY MAINTENANCE).
TRANSPORTING MACHINE
Operating machine without using cleaning functions.
1. Raise brush lift lever and engage lock block.
2. Activate main power switch.
3. Press drive switch towards transport mode symbol
(Figure 10).
FIG. 10

OPERATION
10 Tennant 1550 (09--03)
4. Turn speed control knob to slowest setting
(Figure 11).
FIG. 11
5. Rotate control grips completely forward and slowly
turn speed control knob to desired travel speed
(Figure 12).
FIG. 12
ATTENTION: For first time users, operate at a
slower speed until maneuvering becomes easy.
6. To transport machine in reverse, simply pull
reverse drive trigger (Figure 13).
FIG. 13
7. To stop the machine, position the machine on a
level surface and gradually release the control
grips.
CLEANING WITH MACHINE
1. Lower brush lift lever and engage lock block
(Figure 14).
FIG. 14
2. Activate main power, pump and vacuum switches.
3. Press drive switch towards clean mode symbol
(Figure 15).
FIG. 15
4. Select cleaning mode by pressing the restorative/
interim cleaning switch (Figure 16).
FIG. 16

OPERATION
Tennant 1550 (09--03) 11
Restorative Cleaning Mode: The
machine operates at a slower set speed to restore
heavily soiled carpet areas. The restorative
cleaning mode must be performed on a regular
basis in order for the interim cleaning mode to be
effective.
Interim Cleaning Mode: Machine
operates at faster set speed for routine light
cleaning. The interim cleaning mode will be
ineffective if the restorative cleaning mode is not
performed on a regular basis.
5. Rotate control grips completely forward to begin
cleaning (Figure 17).
WARNING: Do Not Pick Up Flammable
Materials Or Reactive Metals.
NOTE: The machine travel speed for the cleaning
modes are set speeds.
FIG. 17
6. View the brush pressure meter while operating.
Meter should read center of green zone (Figure
18). If brush height adjustment is required, see
ADJUSTING BRUSH HEIGHT.
FIG. 18
7. To operate machine in reverse, raise brush lever
and pull reverse drive trigger (Figure 19).
FIG. 19
8. To stop cleaning, release control grips. Raise
brush lever and turn off machine.
9. After cleaning carpet, allow 3 to 4 hours for carpet
to dry. Use air movers to reduce drying time.
WHILE OPERATING MACHINE
WARNING: Do Not Pick Up Flammable
Materials Or Reactive Metals.
1. Periodically check for foam buildup in recovery
tank (look through clear dome). If excessive foam
buildup begins to develop, pour a recommended
foam control solution into recovery tank.
ATTENTION: Do not allow foam or water beyond
“FULL LINE” label, located on standpipe, vacuum
motor damage will result. Vacuum motor damage
due to foam or water is not covered by warranty.
2. Overlap each pass by about 51 mm (2 in).
3. Use a collapsing rectangle pattern when cleaning
large rooms (Figure 20).
FIG. 20
4. Keep machine within 152--203 mm (6--8 in) of
baseboard.
5. When turning, it may be necessary to turn pump
switch off and raise brush lift lever.

OPERATION
12 Tennant 1550 (09--03)
6. Before reaching end of cleaning path, turn pump
switch off and continue to drive machine forward
to extract solution.
7. Drain recovery tank when recovered water
reaches “FULL LINE” label, located on standpipe
in recovery tank (See DRAINING TANKS).
8. Observe gallon marker for remaining cleaning
solution.
9. Periodically check battery meter discharge level.
Recharge batteries when discharged below half.
10. When solution tank runs dry, turn off pump and
vacuum switches, raise brush and transport
machinetodrainingarea(SeeDRAINING
TANKS).
11. If cleaning path leaves streaks, spray tip cleaning
is required (See MONTHLY MAINTENANCE).
12. If machine is left unattended, turn off machine and
pull out main circuit breaker button.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, turn off machine
and pull out main circuit breaker button.
CIRCUIT BREAKER PANEL
The machine is equipped with (3) resetable circuit
breakers to protect machine from damage, (labeled as
brush, main and drive). They stop current flow when
circuit overload occurs. Once a circuit breaker has
tripped, determine problem, let motor cool down and
manually reset breaker by pressing circuit breaker
button. The vacuum motors are thermally protected
and will automatically shut off when an overload
occurs. The main and drive circuit breakers are
designed so you can stop current flow by manually
pulling out circuit breaker buttons. Pull out the main
circuit breaker button when servicing machine or when
machine is left unattended. Circuit breaker buttons are
located at rear of machine as shown (Figure 21).
FIG. 21
ADJUSTING BRUSH HEIGHT
1. Turn all switches off.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, turn off machine
and pull out main circuit breaker button.
2. Disengage brush lift lever from lock block
(Figure 22).
FIG. 22
3. Locate adjustment knobs on adjustment shaft and
loosen bottom knob (Figure 23).
FIG. 23
4. Turn upper knob clockwise to lower brush and
counterclockwise to raise.
5. Tighten down bottom knob after adjusting.
6. Check brush pressure meter for correct reading.
OPERATING ACCESSORY TOOLS (OPTIONAL)
The optional accessory tools allow you to clean
upholstery and areas that the machine is unable to
clean, such as alcoves, stairs, corners and small
rooms.
For a complete list of accessory tools see the
OPTIONS section in this manual.
NOTE: When cleaning upholstery, always check
cleaning instructions sewn in the furniture by
manufacturer.

OPERATION
Tennant 1550 (09--03) 13
1. Turn main power switch off.
2. Disconnect vacuum hose from recovery dome and
replace with accessory vacuum hose (Figure 24).
FIG. 24
3. Connect solution hose to accessory coupler at the
rear of the machine (Figure 25).
FIG. 25
4. Connect hoses to accessory tool.
5. Raise brush lift lever and engage lock block.
6. Turn main power, pump and vacuum switches on.
7. Place the accessory tool on the area to be
cleaned. Squeeze the trigger on the accessory
tool and slowly pull the tool backwards while
applying downward pressure (Figure 26). Release
the trigger 6 inches from end of stroke. When
returning to the next stroke, push the tool forward
over the same path with trigger released. Continue
this pull and push method with a 2--4 inch overlap.
WARNING: Do Not Pick Up Flammable
Materials Or Reactive Metals.
FIG. 26
8. After cleaning, relieve the water pressure from the
accessory tool before disconnecting the solution
hose. Squeeze trigger for five seconds after
turning the power off.
DRAINING TANKS
When finished cleaning, the recovery and solution
tanks should be drained and cleaned.
DRAINING RECOVERY TANK
1. Transport machine to draining site.
2. Turn all switches off.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface and turn off
machine.
3. Remove drain hose from holder, position hose
over drain site and twist off drain hose plug to
drain (Figure 27).
NOTE: If using a bucket to drain machine, use a
separate bucket for filling solution tank. This will
prevent possible solution line clogs.
FIG. 27

OPERATION
14 Tennant 1550 (09--03)
4. Remove recovery tank dome and use a hose to
rinse out recovery tank. Be careful not to spray
water into standpipe screen.
5. Replace drain hose plug tightly when tank is
empty.
DRAINING SOLUTION TANK
To drain unused solution from solution tank, the
pumpout hose is required (Supplied with machine --
#700141).
1. Connect pumpout hose to accessory tool coupler
at rear of machine (Figure 28).
FIG. 28
2. Hold hose over drain site or remove recovery tank
dome and direct hose into recovery tank.
3. Activate main power and pump switch.
CHARGING BATTERIES
NOTE: Recharge batteries ONLY after a total of 30
minutes of use or more. This will prolong battery life.
The following charging instructions are intended
for chargers supplied with machine.
Use a battery charger with the following
specifications to prevent battery damage.
CHARGER SPECIFICATIONS:
SOUTPUT VOLTAGE -- 36 VOLTS
SOUTPUT CURRENT -- 25 AMPS
SAUTOMATIC SHUT--OFF CIRCUIT
SFOR LEAD ACID DEEP CYCLE BATTERY CHARGING
NOTE: For optimum machine operation, keep
batteries charged at all times. Never leave batteries
discharged for lengthy periods.
WARNING: Keep Sparks And Open Flame
Away. Keep Battery Hood Open When Charging.
FOR SAFETY: When servicing machine, wear
protective gloves and safety glasses when
handling batteries or battery cables. Avoid contact
with battery acid.
1. Transport machine to a well--ventilated area for
charging.
2. Stop the machine on a level surface and turn off
machine.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface and turn off
machine.
3. Remove battery compartment hood to access
batteries (Figure 29).
FIG. 29
4. Before charging, check the electrolyte level (A) in
each battery cell. If the battery plates (B) are
exposed, add just enough distilled water to cover
plates. DO NOT OVERFILL. Overfilled batteries
can overflow during charging due to fluid
expansion. Replace cell caps before charging
(Figure 30).
A
B
FIG. 30

OPERATION
Tennant 1550 (09--03) 15
5. With the charger’s power supply cord unplugged,
connect the battery charger into the machine’s
charging receptacle as shown (Figure 31).
FIG. 31
6. Plug the charger’s power supply cord into a
grounded wall outlet (Figure 32).
Grounded Outlet
Grounding
Edge/hole
Grounded
3HoleOutlet
Ground Pin
(120V) (230V/240V)
FIG. 32
WARNING: Keep Sparks And Open Flame
Away. Keep Battery Hood Open When Charging.
NOTE: Once the charger is connected, the machine
will become inoperable.
7. Charger will automatically begin charging and
automatically shut off when fully charged.
8. When disconnecting charger, always unplug
charger from wall outlet first.
9. After charging, recheck the battery electrolyte
level (A) in each battery cell. The level should be
1 cm (3/8 in) from the bottom of sight tubes (B)
(Figure 33). Add distilled water if needed. DO NOT
OVERFILL.
A
B
FIG. 33
MACHINE MAINTENANCE
To keep machine in good working condition, simply
follow daily, weekly and monthly maintenance
procedures.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface and turn off
machine.
FOR SAFETY: When servicing machine,
disconnect batteries before working on machine.
HOUR METER
The machine is equipped with an hour meter located
on the control console. Use hour meter to determine
recommended maintenance procedures and to record
service history (Figure 34).
FIG. 34
DAILY MAINTENANCE
(Every 4 Hours of Use)
1. Recharge batteries if needed (See CHARGING
BATTERIES).
NOTE: Recharge batteries ONLY after a total of 30
minutes of use or more. This will prolong battery life.
2. Drain and rinse tanks thoroughly.
3. Remove any lint buildup from standpipe screen
(Figure 35).
FIG. 35

OPERATION
16 Tennant 1550 (09--03)
4. Remove and clean solution tank fill port filter
(Figure 36).
FIG. 36
5. Turn main power switch off, pull out main circuit
breaker button and remove any obstruction
(carpet strands, etc.) from brush.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, turn off machine
and pull out main circuit breaker button.
6. Remove lint buildup from splash guard, located
behind brush (Figure 37).
FIG. 37
7. Clean machine housing with an all purpose
cleaner and damp cloth (Figure 38).
FIG. 38
ATTENTION: Do not power spray or hose off
machine. Electrical component damage due to
water is not covered by warranty.
WEEKLY MAINTENANCE
(Every20HoursofUse)
1. Inspect the spray tips for proper spray pattern.
To inspect spray pattern:
a. Pull out (10A) drive circuit breaker to keep the
machine from moving during inspection.
b. Remove the spray bar by shifting spray bar to
operator’s left side of machine and pulling
down. Do not disconnect the spray bar from
the quick-disconnect coupler (Figure 39).
FIG. 39
c. While holding the spray bar with spray tips
pointing downward, briefly turn the control
grips forward. Observe the spray pattern for
any blockage (Figure 40).
d. Clean or replace defective spray tips (See
MONTHLY MAINTENANCE).
FIG. 40

OPERATION
Tennant 1550 (09--03) 17
2. Remove the solution tank filter from underneath
the machine and clean the screens. Make sure the
solution tank is empty before removing filter
(Figure 41).
FIG. 41
3. Check fluid level in battery cells (See BATTERY
MAINTENANCE).
4. Clean battery tops to prevent corrosion (See
BATTERY MAINTENANCE).
5. Check for loose or corroded battery cables.
MONTHLY MAINTENANCE
(Every80HoursofUse)
1. Flush the pump system with an acetic acid
solution to dissolve normal alkaline chemical
buildup. Follow procedure below:
a. Position the machine over a floor drain.
b. Pour 11 liters (3 gal) of hot water into the
solution tank, do not exceed 60°C (140°F).
Pour 750 ml (24oz.) of an acetic acid into the
solution tank.
FOR SAFETY: When using machine, follow mixing
and handling instructions on chemical containers.
c. Pull out drive motor circuit breaker button to
shut off power to drive motor.
d. Activate main power and pump switches.
e. Press drive switch towards clean mode
symbol.
f. Rotate control grips completely forward and
hold for 2 to 3 minutes.
g. Turn main power off and let machine sit
overnight to allow acetic acid to break down
alkaline buildup.
h. Next day, disperse the remaining acetic acid
solution and rinse the solution system with 11
liters (3 gal) of clean water.
i. Reset drive motor breaker button.
2. Disconnect and remove the spray bar from the
machine. Twist out the six quick-release spray
tips. Soak the spray tips in an acetic acid solution
for up to six hours. Do not use pointed objects to
unplug tips, damage will occur (Figure 42).
FIG. 42
3. Check brush belt for wear or excess slack. If belt
flexes more than 12.7 mm (0.50 in) from center,
belt should be tightened.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, turn off machine
and pull out main circuit breaker button.
To Tighten Or Replace Brush Belt:
a. Pull out main circuit breaker button to shut off
power to machine.
b. Remove belt guard, two screws (Figure 43).
(4) Motor
Mount Bolts
FIG. 43
c. Remove any debris in pulley assembly.
d. Inspect belt for wear and for proper tension.
e. To tighten or replace belt, loosen 4 brush
motor mount bolts. If worn, replace belt
(Figure 43).
f. To tighten belt, pull back on motor until belt
becomes tight, retighten mounting bolts.
g. Replace brush guard and reset main circuit
breaker button.
4. Inspect drive chain for proper tension. Chain
should flex between 6.35mm (0.25 in ) and
12.7mm (0.50 in) from center. If chain flexes more
than 12.7mm (0.50 in), chain should be tightened.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, turn off machine
and pull out main circuit breaker button.

OPERATION
18 Tennant 1550 (09--03)
To Tighten Chain:
a. Pull out main circuit breaker button to shut off
power to machine.
b. Loosen 4 motor mount bolts, do not remove
bolts (Figure 44).
Tension Bolt
(4) Motor
Mount Bolts
FIG. 44
c. Loosen lock nut on tension bolt (Figure 44).
d. Turn tension bolt to tighten chain. Do not
overtighten.
e. Retighten motor mount bolts and lock nut on
tension bolt.
f. Lubricate chain with a water resistant oil.
g. Reset main circuit breaker button.
5. Lubricate the caster grease fittings with a water
resistant grease (Figure 45).
FIG. 45
6. Lubricate all linkage pivot points with silicone
spray then coat with a water resistant grease to
maintain a smooth operation.
7. Check machine for water leaks and loose nuts and
bolts.
QUARTERLY MAINTENANCE
(Every 250 Hours of Use)
Check the drive, vacuum and brush motors for carbon
brush wear, replace brushes when worn to a length of
10mm (0.38 in) or less.
Contact an Authorized Service Center for carbon
brush inspection.
FOR SAFETY: When servicing machine all repairs
must be performed by a qualified service person.
BATTERY MAINTENANCE
The lifetime of the batteries is limited by the number of
charges the batteries receive. To get the most life from
the batteries, maintain the proper level of electrolyte
and only recharge after a total of 30 minutes of use or
more.
WARNING: Keep Sparks And Open Flame
Away. Keep Battery Hood Open When Charging.
FOR SAFETY: When servicing machine, wear
protective gloves and safety glasses when
handling batteries or battery cables. Avoid contact
with battery acid.
1. Always follow proper charging instructions (See
CHARGING BATTERIES).
2. Check the electrolyte level (A) in each battery cell.
The level should be 1 cm (3/8 in) from the bottom
of sight tubes after charging. Add distilled water if
needed. DO NOT OVERFILL. Overfilled batteries
can overflow during charging due to fluid
expansion (Figure 46).
A
FIG. 46
3. After charging batteries, measure the specific
gravity in each battery cell using a hydrometer
(Figure 47). This will determine the charge level
and condition of the batteries. If one or more of
the battery cells test lower than the other battery
cell (0.050 or more), the cell is damaged,
shortened, or is about to fail.

OPERATION
Tennant 1550 (09--03) 19
NOTE: Do not take reading immediately after adding
distilled water. The water and acid must be thoroughly
mixed in order for accurate reading.
FIG. 47
SPECIFIC GRAVITY
at 27°C(80°F)
BATTERY
CHARGE
1.265 100% CHARGED
1.223 75% CHARGED
1.185 50% CHARGED
1.148 25% CHARGED
1.110 DISCHARGED
NOTE: Add or subtract 0.004 gravity reading for each
6
° C(10 ° F) above or below 27 ° C(80 ° F).
4. Keep battery tops and terminals clean and dry.
To clean batteries:
a. Mix a strong solution of baking soda and water
(Figure 48).
FIG. 48
b. Brush the solution sparingly over the battery
tops, terminals and cable connectors.
NOTE: Do not allow baking soda solution to enter
battery cells.
c. Use a wire brush to clean the terminal posts
and cable connections.
d. After cleaning, apply a coating of clear battery
post protectant to the terminals and cable
connections.
5. Check for loose or worn cables. Replace if worn.
TO ACCESS INTERNAL COMPONENTS
1. Drain recovery and solution tank.
2. Turn main power switch off and disconnect
batteries.
3. Remove vacuum hoses from vacuum the pickup
heads.
4. Remove drain hose from holder and push hose
halfway through U--bracket to allow hose slack .
5. Carefully hinge tank over (Figure 49).
FIG. 49
TRANSPORTING MACHINE
When transporting machine by use of trailer or truck,
be certain to follow tie--down procedures below:
FOR SAFETY: When using machine, go slow on
inclines and slippery surfaces.
1. Raise brush.
2. Load the machine using a recommended loading
ramp.
3. Position the front of the machine up against the
front of the trailer or truck. Once machine is
positioned, lower the brush and turn off machine.
4. Place a block behind the drive wheel and the rear
casters to prevent machine from rolling.
5. Place tie--down straps over top of machine and
secure straps to floor. It may be necessary to
install tie--down brackets to the floor of your trailer
or truck.
FOR SAFETY: When transporting machine, use a
recommended ramp when loading/unloading
into/off truck or trailer, use tie--down straps to
secure machine to truck or trailer.

OPERATION
20 Tennant 1550 (09--03)
STORING MACHINE
1. Charge batteries before storing. Never store
machine with discharged batteries.
2. Drain and rinse tanks thoroughly.
3. Store the machine in a dry area with the brush in
the raised position.
4. Remove the recovery tank dome to promote air
circulation.
ATTENTION: If storing the machine in freezing
temperatures, be certain to drain tanks, purge
pump and remove the solution tank filter located
under the machine at rear. Damage due to freezing
temperatures is not covered by warranty.
ATTENTION: Do not expose machine to rain, store
indoors.
RECOMMENDED STOCK ITEMS
Refer to the Parts List section for recommended stock
items. Stock Items are clearly identified with a bullet
preceding the parts description. See example below:
TROUBLE SHOOTING
PROBLEM CAUSE SOLUTION
Machine does not operate. Main circuit breaker button pulled out. Push in main circuit breaker button.
Faulty main circuit breaker. Contact Service Center.
Faulty main power switch. Contact Service Center.
Charger connected to machine. Unplug charger from machine after com-
plete charge cycle.
Faulty master solenoid. Contact Service Center.
Loose battery connection. Check battery connections.
Loose connections at solenoid panel. Contact Service Center.
Batteries need charging. See CHARGING BATTERIES.
Faulty battery(s). Replace battery(s).
Battery connection is improper. See INSTALLING BATTERIES.
Vacuum motor does not
operate.
Vacuum thermal overload tripped. Check air flow for obstructions, wait 20
minutes for motor to cool.
Faulty vacuum switch. Contact Service Center.
Loose wiring. Contact Service Center.
Faulty vacuum motor. Contact Service Center.
Carbon brushes worn. Contact Service Center.
Vacuum recovery is poor. Vacuum pickup heads are not sealed to
carpet.
Lock vacuum head lift lever under lock
block.
Carpet fibers are restricting air flow
through vacuum shoes or standpipe
screen.
Remove lint from vacuum shoes (use a
coat hanger) or from standpipe screen in
recovery tank.
Vacuum hose(s) disconnected from vac-
uum shoes or recovery dome.
Connect hoses or call for service.
Drain hose plug is not fully inserted into
drain hose.
Insert drain hose plug and tighten.
Loose or failed gasket(s). Contact Service Center.