Tennant 550 User manual

550
*330670*
www.tennantco.com
330670
Rev. 07 (8-2008)
(Diesel)
Rider Scrubber
Operator Manual
(S/N 006115-- )
North America / International

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.
PROTECT THE ENVIRONMENT
Please dispose of packaging materials,
old machine components such as
batteries, hazardous fluids including
antifreeze and oil, in an environmentally
safe way according to local waste
disposal regulations.
Always remember to recycle.
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 --
Tennant Company
PO Box 1452
Minneapolis, MN 55440
Phone: [phone] or (763) 513--2850
www.tennantco.com
CALIFORNIA PROPOSITION 65 WARNING:
Engine exhaust from this product contains chemicals known to the State of California to cause cancer,
birth defects, or other reproductive harm.
SRS is a US registered trademark of Tennant Company.
Specifications and parts are subject to change without notice.
Original instructions, Copyright E1999--2002, 2004, 2006--2008 TENNANT Company, Printed in U.S.A.

CONTENTS
1
550 Diesel 330670 (2--06)
CONTENTS
Page
SAFETY PRECAUTIONS 5...................
OPERATION 8..............................
PREPARATION FOR OPERATION 8........
AFTER UNLOADING AND BEFORE
OPERATING THE MACHINE: 8.......
OPERATION OF CONTROLS 9............
MACHINE COMPONENTS 9............
INSTRUMENTS AND CONTROLS (For
machines below serial number
007003) 10......................
INSTRUMENTS AND CONTROLS (For
machines serial number 007003 and
above) 11........................
BRAKE PEDAL 12.....................
DIRECTIONAL PEDAL 12...............
OPERATOR SEAT 12...................
SCRUB HEAD LOCK LEVER 12.........
PIVOT LOCK PIN 13...................
PARKING BRAKE LEVER 13............
AMMETER (For machines below serial
number 007003) 13..................
CHARGING SYSTEM LIGHT (For
machines serial number 007003 and
above) 13........................
SQUEEGEE POSITION LAMP (For
machines below serial number
007003) 13......................
TANK DRAIN LAMP (OPTION) 13........
SCRUB BRUSH PRESSURE LAMP
(OPTION) 13.......................
IGNITION SWITCH 13..................
DIESEL PRE-HEAT INDICATING LAMP 14
OPERATING LIGHTS SWITCH
(OPTION) 14.......................
ROTATING LIGHT SWITCH (OPTION) 14.
HAZARD LIGHT SWITCH (OPTION) 14...
FUEL LEVEL GAUGE 14................
PANEL LAMP (OPTION) 14.............
ENGINE HOUR METER 14..............
STEERING WHEEL 14.................
HORN BUTTON (For machines serial
number 007003 and above) 14.......
FUSES (For machines below serial
number 007003) 14..................
FUSES (For machines serial number
007003 and above) 14...............
CIRCUIT BREAKERS (For machines
serial number 007003 and above) 15..
ENGINE OIL PRESSURE GAUGE--
CONTINENTAL ENGINES (For
machines below serial number
006409) 15...................
ENGINE OIL PRESSURE GAUGE
PERKINS ENGINES (For machines
serial number 006409--007002) 15..
Page
ENGINE OIL PRESSURE LIGHT (For
machines serial number 007003
and above) 15....................
ENGINE COOLANT TEMPERATURE
GAUGE 15.........................
SQUEEGEE SWITCH 15................
SCRUB BRUSH LEVER 15..............
SCRUB HEAD POSITION LEVER 16.....
SRS LIQUID LOW LEVEL LAMPS
(OPTION) 16.......................
SRS CLEANING SOLUTION FLOW
KNOB (OPTION) 16.................
SOLUTION LEVER 16..................
THROTTLE LEVER 16..................
THROTTLE SWITCH (For machines
serial number 006409--007002)) 16....
MACHINE OPERATION 17.................
NORMAL SCRUBBING OPERATION 17..
PRE-START CHECKLIST 17............
TO START MACHINE 17................
TO FILL SOLUTION TANK 17...........
TO SCRUB 18.........................
TO DRAIN AND CLEAN RECOVERY
TANK AND EMPTY HOPPER 19......
POST OPERATION CHECKLIST --
ENGINE OPERATING 20.............
TO STOP MACHINE 20.................
POST OPERATION CHECKLIST --
ENGINE STOPPED 20...............
DOUBLE SCRUBBING OPERATION 20..
OPERATION ON GRADES 20...........
MACHINE TROUBLESHOOTING 21.....
OPTIONS OPERATION 22..............
HIGH PRESSURE SPRAYER 22......
TO OPERATE HIGH PRESSURE
SPRAYER 22.................
VACUUM WAND 20.................
TO OPERATE VACUUM WAND 22.
TOWING AND TRANSPORTING THE
MACHINE 23.......................
TOWING THE MACHINE 23..........
TRANSPORTING THE MACHINE 23..
MACHINE JACKING LOCATIONS 25.....
MACHINE STORAGE 26................
STORING MACHINE 26................
DIESEL POWERED MACHINES 26...

CONTENTS
550 Diesel 330670 (2--06)
2
Page
MAINTENANCE 27..........................
RECOMMENDED FIRST 50-HOUR
MACHINE INSPECTION 27.............
MAINTENANCE CHART 28................
LUBRICATION 30.........................
ENGINE 30............................
VACUUM FAN SHAFT 30...............
MACHINE PIVOT 30...................
SCRUB HEAD PIVOT 31................
SCRUB HEAD HINGES 31..............
REAR SQUEEGEE CASTERS 31........
SCRUB BRUSH IDLER PLUGS 31.......
REAR WHEELS 31.....................
HYDRAULICS 32.........................
HYDRAULIC FLUID 32.................
HYDRAULIC FLUID RESERVOIR 32.....
TO DRAIN THE HYDRAULIC
FLUID RESERVOIR 33............
TO FILL THE HYDRAULIC
FLUID RESERVOIR 33............
HYDRAULIC FLUID RESERVOIR
BREATHER 34......................
HYDRAULIC FLUID FILTER 34..........
TO REPLACE THE HYDRAULIC
FLUID FILTER ELEMENT 34......
HYDRAULIC FLUID LEAKS 34..........
HYDRAULIC COMPONENTS
TROUBLESHOOTING 35............
ENGINE 36..............................
LUBRICATION 36......................
COOLING SYSTEM 36.................
AIR INTAKE SYSTEM 37...............
AIR FILTER SERVICE INDICATOR 37....
AIR FILTER 37.........................
TO REPLACE AIR FILTER ELEMENT --
CONTINENTAL ENGINES (For
machines below serial number
006409) 38...................
TO REPLACE AIR FILTER ELEMENT --
PERKINS OR CAT ENGINES (For
machines serial number 006409
and above) 39.................
FUEL SYSTEM 40........................
FUEL WATER TRAP 40.................
TO CLEAN WATER TRAP 40.........
FUEL FILTER 40.......................
TO REPLACE FUEL FILTER --
CONTINENTAL ENGINES (For
machines below serial
number 006409) 40............
TO REPLACE FUEL FILTER --
PERKINS ENGINES (For machines
serial number 006409--007002) 41
WATER SEPARATOR/FUEL FILTER --
CAT ENGINES (For machines serial
number 007003 and above) 41..
IN--LINE FUEL FILTER -- PERKINS
ENGINES (For machines serial
number 006409--007002) 42.....
Page
FUEL INJECTION PUMP 42.............
FUEL INJECTORS 42..................
PRIMING THE FUEL SYSTEM --
CONTINENTAL ENGINES (For
machines below serial number
006409) 43...................
PRIMING THE FUEL SYSTEM --
PERKINS ENGINES (For machines
serial number 006409--007002) 43..
CYLINDER HEAD 44......................
CYLINDER HEAD BOLT TIGHTENING --
CONTINENTAL ENGINES (For
machines below serial
number 006409) 44............
CYLINDER HEAD BOLT TIGHTENING
PERKINS ENGINES (For machines
serial number 006409--007002) 44..
VALVE TAPPET CLEARANCE 45........
ELECTRICAL SYSTEM 46.................
BATTERY 46.............................
BELTS AND CHAINS 47...................
VACUUM FAN DRIVE BELT 47..........
TO ADJUST VACUUM FAN DRIVE
BELT 47.........................
ALTERNATOR AND RADIATOR
FAN BELT 47.......................
TO ADJUST ALTERNATOR AND
RADIATOR FAN BELT 47..........
SCRUB HEAD 48.........................
TO ADJUST SCRUB HEAD HEIGHT 48..
TO ADJUST SCRUB BRUSH PATTERN 48
SCRUB BRUSHES 50..................
TO REPLACE SCRUB BRUSHES 50..
SOLUTION SYSTEM 52...................
RECOVERY TANK 52..................
WATER SPRAY DEFLECTOR 52........
SRS WATER SPRAY DEFLECTOR 53....
SRS SOLUTION TANK 54...............
SOLUTION DISPENSING TUBE 55......
SRS METERING SOLUTION PUMP 55...
TROUBLESHOOTING 55...............
SQUEEGEES 56..........................
SIDE SQUEEGEES 56.................
REAR SQUEEGEE 56..................
TO REPLACE REAR SQUEEGEE
BLADES 57......................
TO FACTORY ADJUST REAR
SQUEEGEE 57..................
TO ADJUST REAR SQUEEGEE 60...
BRAKES AND TIRES 62...................
SERVICE BRAKES 62..................
PARKING BRAKES 63..................
TIRES 63.............................
OPTIONS 64.............................
HIGH PRESSURE SPRAYER 64.........

CONTENTS
3
550 Diesel 330670 (12--04)
Page
MACHINE SPECIFICATIONS 65...............
POWER TYPE 65.........................
CONTINENTAL ENGINES -- (For machines
below serial number 006409) 65.......
PERKINS ENGINES -- (For machines
serial number 006409--007002) 65.....
CAT ENGINES -- (For machines serial
number 007003 and above) 65........
POWER TRAIN 65........................
STEERING 65............................
HYDRAULIC SYSTEM 66..................
BRAKING SYSTEM 66....................
SUSPENSION SYSTEM 66................
SYSTEM FLUID CAPACITIES 66...........
GENERAL MACHINE
DIMENSIONS/CAPACITIES 67..........
MACHINE WEIGHTS 67...................
GENERAL MACHINE PERFORMANCE 67...
MACHINE DIMENSION 68.................
INDEX 69...................................

CONTENTS
550 Diesel 330670 (12--04)
4

SAFETY PRECAUTIONS
5
550 Diesel 330670 (8--02)
SAFETY PRECAUTIONS
The following symbols are used throughout this
manual as indicated in their descriptions:
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 information signals potentially
dangerous conditions to the operator or
equipment. Read this manual carefully. Know
when these conditions can exist. Locate all safety
devices on the machine. Then, take necessary
steps to train machine operating personnel.
Report machine damage or faulty operation
immediately. Do not use the machine if it is not in
proper operating condition.
WARNING: Engine Emits Toxic Gases.
Severe Respiratory Damage Or
Asphyxiation Can Result. Provide
Adequate Ventilation. Consult With Your
Regulatory Agency For Exposure
Limits. Keep Engine Properly Tuned.
WARNING: Machine Can Emit Excessive
Noise. Consult With Your Regulatory
Agency For Exposure Limits. Hearing
Loss Can Result. Wear Hearing
Protection.
WARNING: Flammable Materials Can
Cause An Explosion Or Fire. Do Not
Pick Up Flammable Materials. Do Not
Use Flammable Materials In Tank To
Clean Floor.
WARNING: Flammable materials or
reactive metals can cause explosion or
fire. Do not pick up.
WARNING: Moving Belt. Keep Away.
WARNING: Moving Fan Blades. Keep
Away.
WARNING: Raised Scrub Head May Fall.
Block Scrub Head Up.
WARNING: Crush Hazard Between Front
And Rear Halves Of Machine. Engage
Pivot Lock.
WARNING: Heavy LP Tank May Fall.
Remove LP Tank Before Opening Cover.
WARNING: Strong Vacuum. Keep Away
From Fan Inlet When Fan Is Running.
FOR SAFETY:
1. Do Not Operate Machine:
-- Unless Trained And Authorized.
-- Unless Operation Manual Is Read And
Understood.
-- In Flammable Or Explosive Areas
Unless Designed For Use In Those
Areas.
-- In Areas With Possible Falling Objects
Unless Equipped With Overhead
Guard.
2. Before Starting Machine:
-- Check For Fuel Leaks.
-- Keep Sparks And Open Flame Away
From Refueling Area.
-- Make Sure All Safety Devices Are In
Place And Operate Properly.
-- Check Brakes And Steering For Proper
Operation.
3. When Starting Machine:
-- Keep Foot On Brake And Directional
Pedal In Neutral.
4. When Using Machine:
-- Use Brakes To Stop Machine.
-- Go Slow On Grades And Slippery
Surfaces.
-- Use Care When Backing Machine.
-- Do Not Carry Riders On Machine.
-- Always Follow Safety And Traffic
Rules.
-- Report Machine Damage of Faulty
Operation Immediately.
-- Follow mixing and handling
instructions on chemical containers.
5. Before Leaving Or Servicing Machine:
-- Stop On Level Surface.
-- Set Parking Brake.
-- Turn Off Machine And Remove Key.

SAFETY PRECAUTIONS
550 Diesel 330670 (8--02)
6
6. When Servicing Machine:
-- AvoidMovingParts.DoNotWear
Loose Jackets, Shirts, Or Sleeves.
-- Block Machine Tires Before Jacking
Machine Up.
-- Jack Machine Up At Designated
Locations Only. Block Machine Up
With Jack Stands.
-- Use A Hoist Or Jack That Will Support
The Weight Of The Machine.
-- Wear Eye And Ear Protection When
Using Pressurized Air Or Water.
-- Disconnect Battery Connections
Before Working On Machine.
-- Avoid Contact With Battery Acid.
-- Avoid Contact With Hot Engine
Coolant.
-- Allow Engine To Cool.
-- Keep Flames And Sparks Away From
Fuel System Service Area. Keep Area
Well Ventilated.
-- Use Cardboard To Locate Leaking
Hydraulic Fluid Under Pressure.
-- Use TENNANT Supplied Or Approved
Replacement Parts.
7. When loading/unloading machine
onto/off truck or trailer:
-- Turn off machine.
-- Use truck or trailer that will support
the weight of the machine.
-- Use winch. Do not drive the machine
onto/off the truck or trailer unless the
load height is 380 mm (15 in) or less
from the ground.
-- Set parking brake after machine is
loaded.
-- Block machine tires.
-- Tie machine down to truck or trailer.
The following safety decals are mounted on the
machine in the locations indicated. If these, or any
decal becomes damaged or illegible, install a new
decal in its place.
TRAVEL SPEED CAUTION DECAL --
LOCATED ON THE SIDE OPERATOR
PANEL
SCRUB HEAD LOCK WARNING DECAL
-- LOCATED ON THE SCRUB HEAD
FAN SUCTION DANGER DECAL --
LOCATED ON THE SOLUTION TANK
03785
03787
03786
00291

SAFETY PRECAUTIONS
7
550 Diesel 330670 (9--01)
03784
ENGINE FAN WARNING DECAL --
LOCATED ON THE FAN SHROUD
00291
03788
PINCH SPACE DANGER
DECAL -- LOCATED ON THE
SOLUTION TANK
ENGINE FAN WARNING
DECAL -- LOCATED ON THE
LEFT SIDE TOP ACCESS
DOOR LIP
FLAMMABLE MATERIALS WARNING
DECAL -- LOCATED IN THE
OPERATOR COMPARTMENT
FLAMMABLE MATERIALS WARNING DECAL --
LOCATED ON THE SOLUTION TANKS

OPERATION
550 Diesel 330670 (12--99)
8
PREPARATION FOR OPERATION
AFTER UNLOADING AND BEFORE
OPERATING THE MACHINE:
1. Check the machine for shipping damage.
2. Read this manual carefully before operating
or servicing the machine.
FOR SAFETY: Do Not Operate Machine
Unless Operation Manual Is Read And
Understood.
3. Check the hydraulic fluid level in the
hydraulic fluid reservoir, using the dipstick
provided. TENNANT hydraulic fluid is
recommended. If TENNANT hydraulic fluid
is not available, use only new, approved
hydraulic fluid. See the HYDRAULICS in the
MAINTENANCE section.
4. Check the engine oil level.
5. Check the radiator coolant level.
6. Check the brush adjustment, as described in
SCRUB HEAD in the MAINTENANCE
section.
7. Check the air pressure of the tires.
8. Fill the fuel tank on the machine per the
instructions in this manual.

OPERATION
9
550 Diesel 330670 (8--08)
OPERATION OF CONTROLS
C
E
D
G
F
I
J
H
ABK
00291
MACHINE COMPONENTS
A. Steering Wheel G. Articulated Joint
B. Instrument Panel H. Side Squeegee
C. Solution Tank I. Head Pivot
D. Rear Squeegee J. Debris Trough Release Lever
E. Recovery Tank K. Fuel Tank
F. Clean-out Door

OPERATION
550 Diesel 330670 (2--06)
10
A
B
C
D
EF
G
H
I
AA
K
L
M
N
O
P
Q
R
S
TU
V
W
X
Z
Z
BB
CC
For machines below
serial number 006409
J
Y
02353
INSTRUMENTS AND CONTROLS (For machines below serial number 007003)
A. Brake Pedal P. Fuses
B. Directional Pedal Q. Engine Hour Meter
C. Operator Seat R. Instrument Panel
D. Parking Brake Lever S. Oil Pressure Gauge
E. Ammeter T. Engine Coolant Temperature Gauge
F. Squeegee Position Lamp U. Squeegee Switch
G. Tank Drain Lamp (Option) V. Scrub Brush Lever
H. Scrub Brush Pressure Lamp (Option) W. Scrub Head Position Lever
I. Ignition Switch X. SRS Panel (Option)
J. Diesel Pre-Heat Indicating Lamp Y. Solution Lever
K. Operating Lights Switch (Option) Z. Throttle Lever
L. Rotating Light Switch (Option) AA.Horn Button
M. Hazard Light Switch (Option) BB.Steering Wheel
N. Fuel Level Gauge CC.Throttle Switch
O. Panel Lamp (Option)

OPERATION
11
550 Diesel 330670 (2--06)
AB
C
D
E
F
G
H
I
J
K
N
Q
L
M
O
P
R
Y
Z
S
T
UV
X
W
02353
INSTRUMENTS AND CONTROLS (For machines serial number 007003 and above)
A. Brake Pedal P. Circuit Breakers
B. Directional Pedal Q. Engine Hour Meter
C. Operator Seat R. Instrument Panel
D. Parking Brake Lever S. Squeegee Switch
E. Engine Coolant Temperature Gauge T. Scrub Brush Lever
F. Horn Button U. Scrub Head Position Lever
G. Tank Drain Lamp (Option) V. Throttle Lever
H. Scrub Brush Pressure Lamp (Option) W. Solution Lever
I. Ignition Switch X. SRS Panel (Option)
J. Diesel Pre-Heat Indicating Lamp Y. Low Engine Oil Pressure Light
K. Operating Lights Switch (Option) Z. Charging System Light
L. Rotating or Hazard Light Switch
(Option)
M. Steering Wheel
N. Fuel Level Gauge
O. Panel Lamp (Option)

OPERATION
550 Diesel 330670 (12--99)
12
BRAKE PEDAL
The brake pedal operates the brakes on the two
front wheels.
To stop the machine, return the directional control
pedal to neutral; then apply pressure to the brake
pedal.
DIRECTIONAL PEDAL
A single foot pedal controls the propelling drive.
The foot pedal is used to select the direction of
travel and the speed of the machine.
A
B
C
E
D
00116
DIRECTIONAL PEDAL
A. “Reverse” Position
B. “Neutral” Position
C. “Forward” Position
D. “Toe” Portion
E. “Heel” Portion
Gradually press the “toe” portion of the pedal for
forward travel or the “heel” portion of the pedal for
reverse travel. Regulate the speed of the machine
by varying the pressure on the pedal.
NOTE: Always use the brake pedal for normal
stopping and controlling machine speed on down
grades.
OPERATOR SEAT
The operator seat is of a fixed back style with a
forward-backward adjustment. To adjust the seat,
loosen the seat mounting bolts, slide the seat to
the position desired, and tighten the bolts.
SCRUB HEAD LOCK LEVER
The scrub head lock lever controls the scrub head
lock mechanism. This locks the scrub head,
preventing it from lowering.
To set the scrub head lock, fully raise the scrub
head. Then push the scrub head lock lever into
the “LOCK” position.
To release the scrub head lock, fully raise the
scrub head. Then pull the scrub head lock lever
into the “UNLOCK” position.
Always set the scrub head lock before working
under the scrub head. The scrub head lock must
also be set whenever the machine will not be
used for an extended period of time, overnight for
example. Flat spots on the brushes will appear if
the scrub head is left down for an extended period
of time.
WARNING: Raised Scrub Head May Fall.
Block Scrub Head Up.
B
A
01816
SCRUB HEAD LOCK LEVER
A. Operator Seat
B. Scrub Head Lock Lever

OPERATION
13
550 Diesel 330670 (12--04)
PIVOT LOCK PIN
The pivot lock pin is provided to lock the pivot joint
between the front and rear machine sections. The
pin is hung on the front section of the machine
adjacent to the machine pivot.
To lock the sections, turn the machine so the pivot
lock holes line up, then insert the pin in the lined
up holes. The pin will prevent the machine from
pivoting and creating a pinch area.
WARNING: Crush Hazard Between Front
And Rear Halves Of Machine. Engage
Pivot Lock.
B
C
A
00251
PIVOT LOCK PIN IN USE
A. Machine Trailer Section
B. Machine Tractor Section
C. Pivot Lock Pin
PARKING BRAKE LEVER
The parking brake lever controls the brakes on
the two front wheels. To set the parking brake pull
the brake handle up. To release the parking brake
push the brake handle down. Always set the
parking brake before leaving the machine
unattended and before working on the machine.
FOR SAFETY: Before Leaving Or Servicing
Machine; Stop On Level Surface, Set Parking
Brake, Turn Off Machine And Remove Key.
AMMETER (For machines below serial
number 007003)
The ammeter registers the charging current which
is being passed to the battery by the alternator. It
also registers battery discharge used by the
machine when the alternator is not charging.
CHARGING SYSTEM LIGHT (For machines
serial number 007003 and above)
The charging system light comes on when the
existing voltage potential of the battery is not
within normal range (10 to 14 Volts). Stop
operating the machine. Locate the problem and
have it corrected.
SQUEEGEE POSITION LAMP (For machines
below serial number 007003)
The squeegee position lamp lights when the
squeegee is either fully raised or lowered. This
can be helpful to the operator when the squeegee
is not visible.
TANK DRAIN LAMP (OPTION)
The tank drain lamp lights when the recovery tank
is nearly full. The machine operator can then plan
to return to a draining location.
SCRUB BRUSH PRESSURE LAMP (OPTION)
The scrub brush pressure lamp option lights when
scrub brush down pressure is excessive, which
may cause the brushes to stall. The operator
should then check the brush position adjustment.
NOTE: This information holds true only after the
hydraulic fluid has warmed up (about 10 to 15
minutes). If the light comes on after the oil is
warm, the cause may be operating on a rough
floor-use “restricted” brush down pressure.
IGNITION SWITCH
The key-operated ignition switch has four
positions. Those positions are “accessories,” “off,”
“on,” and “start.” To operate any electrical option
without operating the engine, turn the switch to
the “accessories” position.
To start the engine, turn the key to the “start”
position. Do not engage the starter for more than
ten seconds at a time, or after the engine has
started, as the starter may be damaged. To stop
the engine, turn the key to the “off” position.
FOR SAFETY: Before Starting Machine,
Make Sure All Safety Devices Are In
Place And Operate Properly.

OPERATION
550 Diesel 330670 (2--06)
14
DIESEL PRE-HEAT INDICATING LAMP
The diesel pre-heat indicating lamp is present on
diesel powered machines. The lamp lights when
the diesel pre-heater is operating.
OPERATING LIGHTS SWITCH (OPTION)
The operating lights switch is present on
machines with the operating lights option. It
controls the headlights, taillights, and the brush
spot light. Flip the switch toggle upward to turn
the lights on. Flip the switch toggle down to turn
the lights off.
ROTATING LIGHT SWITCH (OPTION)
The rotating light switch is present on machines
with the rotating light switch option. Flip the switch
toggle up to turn the light on. Flip the switch
toggle down to turn light off.
HAZARD LIGHT SWITCH (OPTION)
The hazard light switch is present on machines
with the hazard light option. Flip the switch toggle
up to turn the light on. Flip the switch toggle down
to turn the light off.
FUEL LEVEL GAUGE
The fuel level gauge is present on all diesel
powered machines. The gauge indicates how
much fuel is left in the fuel tank.
PANEL LAMP (OPTION)
The panel lamp is present on machines with the
operating lights option. The lamp lights whenever
the operating lights switch toggle is flipped up to
turn on the operating lights.
ENGINE HOUR METER
The hour meter records the number of hours the
machine has been operated. This information is
useful in determining when to service the
machine.
STEERING WHEEL
The steering wheel controls a steering cylinder
which is mounted between the two halves of the
machine. Do not turn the steering wheel
excessively when the engine is not running. An
articulated trunnion connects the front and rear
sections of the machine so that the rear section
always follows the path of the front section. A
horn button is located in the center of the steering
wheel. (For machines below serial number
007003) a horn button is located in the center of
the steering wheel.
HORN BUTTON (For machines serial number
007003 and above)
The horn button operates the horn. To sound the
horn press the button.
FUSES (For machines below serial number
007003)
Fuses are a one-time circuit protection device
designed to stop the flow of current in the event of
a circuit overload. Never substitute higher value
fuses than those specified in this manual. The
chart below shows the various fuses and the
electrical components they protect.
PROTECTIVE-
DEVICE
RATING CIRCUIT
PROTECTED
Fuse 80 A Glow Plugs
Fuse 15 A Auto-Squeegee
Fuse 1A Recovery Tank Level
Lamps
Fuse 1A SRS Tank Level
Lamps
Fuse 15 A Brush Pressure Lamp,
Squeegee Pressure
Lamps
Fuse 20 A Rotating, Hazard
Lights
Fuse 10 A SRS Solution Pump
FUSES (For machines serial number 007003
and above)
Fuses are a one-time circuit protection device
designed to stop the flow of current in the event of
a circuit overload. Never substitute higher value
fuses than those specified in this manual. The
chart below shows the various fuses and the
electrical components they protect.
PROTECTIVE-
DEVICE
RATING CIRCUIT
PROTECTED
Fuse--1 150 A Alternator
Fuse--2 15 A Fuel Pump
Fuse--3 50 A Glow Plugs

OPERATION
15
550 Diesel 330670 (2--06)
CIRCUIT BREAKERS (For machines serial
number 007003 and above)
The circuit breakers are resetable electrical circuit
protection devices. Their design stops the flow of
current in the event of a circuit overload. Once a
circuit breaker is tripped, it must be reset
manually. Press the reset button after the breaker
has cooled down.
If the overload that caused the circuit breaker to
trip is still there, the circuit breaker will continue to
stop current flow until the problem is corrected.
The chart lists the circuit breakers and the
electrical components they protect.
Circuit
Breaker Rating Circuit Protected
CB--1 15 A Gauges
CB--2 20 A Horn/Rotating, Hazard
Lights/Turn Signal
CB--3 15 A Operating Lights
CB--4 15 A Squeegee
CB--5 15 A SRS/Recovery Tank
Level Lamps
CB--6 15 A SRS Solution Pump
ENGINE OIL PRESSURE GAUGE--
CONTINENTAL ENGINES
(For machines below serial number 006409)
The engine oil pressure gauge registers the
engine oil pressure. Normal engine oil pressure
ranges from 7 psi (50 kPa) at idle, to 35 psi (240
kPa) at full engine throttle. If the gauge registers
an oil pressure reading below 7 psi (50 kPa), stop
the engine immediately and determine the cause.
Failure to stop the engine will result in severe
engine damage.
ENGINE OIL PRESSURE GAUGE PERKINS
ENGINES
(For machines serial number 006409--007002)
The engine oil pressure gauge registers the
engine oil pressure. Normal engine oil pressure
ranges from 9 psi (65 kPa) at idle, to 70 psi (485
kPa) at full engine throttle. If the gauge registers
an oil pressure reading below 9 psi (65 kPa), stop
the engine immediately and determine the cause.
Failure to stop the engine will result in severe
engine damage.
ENGINE OIL PRESSURE LIGHT (For machines
serial number 007003 and above)
The engine oil pressure light comes on when the
engine oil pressure falls below 5 psi (40 kPa).
Stop operating the machine. Locate the problem
and have it corrected.
ENGINE COOLANT TEMPERATURE GAUGE
The engine coolant temperature gauge registers
the engine coolant temperature. Normal engine
coolant temperatures range up to 200_F
(93_C). Temperatures above this level indicate
an over-heating engine. Over-heating may occur
due to a low coolant level, a clogged radiator, a
loose fan belt, a defective thermostat, or other
engine malfunctions. Engine overheating will
always cause a coolant loss. If coolant loss does
not occur, check for malfunction of the
temperature sending unit.
SQUEEGEE SWITCH
The squeegee switch, in conjunction with a
hydraulic flow sensing device, and the scrub
brush lever, controls the position of the rear
squeegee.
To raise the squeegee, flip the switch toggle
forward into the “Squeegee Up” position. This
position cannot be overridden by the hydraulic
flow sensing device.
To lower the squeegee, flip the switch toggle back
into the “Down” position. The squeegee will lower
when the machine starts moving in the forward
direction. When traveling in the reverse direction,
the hydraulic flow sensing device overrides the
squeegee switch and raises the rear squeegee.
This prevents the rear squeegees from being
damaged when traveling in reverse. The
squeegee switch should always be in the “Down”
position when scrubbing.
SCRUB BRUSH LEVER
The scrub brush lever controls the scrub brush
motors. To start the scrub brushes rotating in their
normal direction, pull the lever into the “ON”
position. To stop brush rotation, move the lever
into the “OFF” position.
To start the scrub brushes rotating opposite their
normal direction for double scrubbing, push the
lever into the “REVERSE” position.

OPERATION
550 Diesel 330670 (2--06)
16
SCRUB HEAD POSITION LEVER
The scrub head position lever controls the
position of the scrub head. To raise the scrub
head, pull the lever back into the “RAISE”
position. To stop scrub head movement move the
lever to the “HOLD” position. To lower the scrub
head, push the lever into the “LOWER” position.
SRS LIQUID LOW LEVEL LAMPS (OPTION)
The SRS liquid low level lamps option includes
two indicating lamps. The cleaning solution lamp
lights when the cleaning solution level is low. The
recycling solution lamp lights when the recycling
solution is low.
AB
C
00351
SRS CONTROL PANEL
A. Liquid Low Level Indicator Lamps
B. Cleaning Solution Flow Knob
C. SRS Pump System Fuse (For
machines below serial number 007003)
C. SRS Pump System Circuit Breaker
(For machines serial number 007003
and above)
SRS CLEANING SOLUTION FLOW KNOB
(OPTION)
The SRS cleaning solution flow knob controls
the pumping of cleaning solution into the solution
flow to the floor. The “LOW”, “MED”, and “HI”
levels indicate the rate of cleaning solution flow.
The “LOW” level causes the pump to deliver
one-fourth flow capacity, “MED” level one-half
capacity, and “HI” level full pump capacity of
cleaning solution into the solution flow to the floor.
The “OFF” position shuts off the cleaning solution
flow.
SOLUTION LEVER
The solution lever controls the solution control
valve. To stop solution flow to the floor, push the
lever into the “CLOSED” position. To start solution
flow, pull the lever into the “OPEN” position.
THROTTLE LEVER
The throttle level controls the engine governed
speed and stops the engine. To speed the engine
to the maximum governed speed, move the lever
into the “FULL” position. To slow the engine to idle
speed, move the lever to the “IDLE” position. To
stop the engine, move the lever to the “STOP”
position.
THROTTLE SWITCH (For machines serial
number 006409--007002))
The throttle switch controls the engine governed
speed. To speed the engine to the maximum
governed speed, move the switch into the “FULL”
position. To slow the engine to idle speed, move
the switch to the “IDLE” position.

OPERATION
17
550 Diesel 330670 (12--99)
MACHINE OPERATION
NORMAL SCRUBBING OPERATION
A normal scrubbing operation consists of eight
typical operations: pre-start checklist, starting
machine, filling solution tank, scrubbing, draining
recovery tank and emptying hopper, post
operation checklist -- engine operating, stopping
machine, and post operation checklist -- engine
stopped.
PRE-START CHECKLIST lists things to check
before starting the machine.
TO START MACHINE lists the steps required to
start the machine.
TO FILL SOLUTION TANK lists the steps
required to fill the solution tank.
TO SCRUB lists things to keep in mind before and
during the scrubbing operation.
TO DRAIN RECOVERY TANK AND EMPTY
HOPPER lists the steps required to empty the
debris hopper and the recovery tank.
POST OPERATION CHECKLIST -- ENGINE
OPERATING lists things to check before stopping
the machine engine.
TO STOP MACHINE lists the steps required to
stop the machine.
POST OPERATION CHECKLIST -- ENGINE
STOPPED lists things to check after stopping the
machine engine.
PRE-START CHECKLIST
Check under the machine for leak spots.
Check the engine lubricating oil level.
Check the engine air filter restriction indicator.
Check the fuel level.
Check the brakes and controls for proper
operation.
Check the service records to determine service
requirements.
TO START MACHINE
NOTE: Before starting machine, perform the
pre-start checks.
1. The machine operator must be in the
operator’s seat with the directional pedal in
the “neutral” position and with a foot on the
brake pedal or with the parking brake set.
FOR SAFETY: Before Starting Machine,
Make Sure All Safety Devices Are In
Place And Operate Properly.
2. Cold engine: Turn the ignition key to the “on”
position to start the diesel pre-heater. Wait
until the pre-heater lamp goes off, then
proceed to start the engine.
ATTENTION! Do not use a cold engine
starting aid such as ether unless
directed to by a representative of the
engine manufacturer.
3. Move the throttle to the “IDLE” position.
4. Turn the ignition switch key to the “start”
position until the engine starts. Do not
operate the starter for more than ten
seconds at a time or after the engine has
started.
NOTE: Do not operate the starter motor for more
ten seconds at a time or after the engine has
started. Allow the starter to cool between starting
attempts. The starter motor may be damaged if it
is operated incorrectly.
5. Allow the engine and hydraulic system to
warm up three to five minutes.
6. Release the machine parking brake.
7. Drive the machine to the solution filling site.

OPERATION
550 Diesel 330670 (2--06)
18
TO FILL SOLUTION TANK
1. Stop the engine and set the parking brake.
FOR SAFETY: Before Leaving Or
Servicing Machine; Stop On Level
Surface, Set Parking Brake, And Turn
Off Machine.
2. Open the solution tank fill door or cap.
3. Pour the required amount of detergent into
the tank. Fill the tank with water to 1 in
(25 mm) below the tank opening. The water
must not be hotter than 130_F(54_C) or
tank damage may occur.
FOR SAFETY: When using machine,
follow mixing and handling instructions
on chemical containers.
NOTE: If standing water is to be picked up in
addition to the solution put down by machine, do
not fill tank all of the way. This will allow more
water to be picked up before the ball float shutoff
is actuated.
SRS machines: Pour liquid detergent into
the cleaning solution tank -- not the solution
tank. Do not use powdered detergent or any
other detergent not designed for the SRS
application. Replace the cleaning solution
tank fill cap.
FOR SAFETY: When using machine,
follow mixing and handling instructions
on chemical containers.
NOTE: Floor conditions, water condition, amount
of soilage, type of soilage, brush action, and
squeegee action all play an important role in
determining the type and the concentration of
detergent to be used. For specific
recommendations, contact the local TENNANT
representative.
WARNING: Flammable Materials Can
Cause An Explosion Or Fire. Do Not Use
Flammable Materials In Tank(s).
A
B
C
00348
SRS TANK
A. Solution Tank
B. Solution Fill Door
C. Cleaning Solution Fill Cap
4. Close the solution fill door.
TO SCRUB
Plan the scrubbing in advance. Try to arrange
long runs with minimum stopping and starting. Do
an entire floor or section at one time.
Pick up oversize debris before scrubbing.
Remove bulky debris from aisles before
scrubbing. Pick up pieces of wire, twine, string,
etc., which could become entangled in brush or
brush plugs.
Allow a few inches overlap of brush paths.
Do not turn steering wheel too sharply when the
machine is in motion. It is very responsive to the
movement of the steering wheel. Avoid sudden
turns, except in emergencies.
Try to scrub as straight a path as possible. Avoid
bumping into posts or scraping the sides of the
machine.
1. Drive the machine to the area to be
scrubbed.
2. Move the scrub head position lever to the
“RAISE” position to release the scrub head
lock.
3. Move the scrub head lock lever to the
“UNLOCK” position.