Tennant T290 User manual

Stavale
T290
TECHNICAL SERVICE MANUAL
TECHNICAL OFFIC
E
PLDC04452
REVISION DAT
E
December 23, 2020
DAT
E
December 23, 2020

In line with the company's policy of constant product development and updating, the Manufacture
r
reserves the right to make modifications without warning.
A
lthough your machine may differ appreciably from the illustrations in this document, safety an
d
the information contained in this manual are guaranteed.
Stavale
PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
WARNINGS
! DANGER!
Indicates the need for attention in order to avoid a series of consequences which
could cause death or damage to the health of the operator.
Indicates particularly important instructions.
*
WARNING!
Indicates the need for attention in order to avoid a series of consequences which
could cause damage to the machine or work environment or financial loss.
i INFORMATION

A
B
C
D
EE1 Error codes
D2 Main Wiring Traction Version
Main Wiring Pad Assist
Relay and drive motor
electrical connections
Circuit boards
Electrical system
D3 Wiring diagram
D1
Brush head
A2 Replacing the brush motor
Checking brush motor current
imput,
Replacing the carbon brushes
A1
Measuring current draw and
replacing the carbon brushes
Replacing the suction motor
B1
Error codes
Troubleshooting E2 Troubleshooting
Drive assembly
B2 Adjusting and replacing the
squee
g
ee
Checking and replacing the
float
Tanks / Suction
Assembly
Drive motor - Idle wheels
B3
C1 Instrument panel board
C2
C3

Sub
j
ect Page
A
BRUSH HEAD
A
1
BRUSH MOTOR 2
A1.1 Cheking brush motor current input 3
A1.2 Replacing the brush motor carbon brushes 5
A
2
REPLACING THE BRUSH MOTOR
9
A2.1 Replacing the brush motor 10
BSUCTION UNIT - TANKS
B1
SUCTION MOTOR
B1.1 Checking the suction motor current input
14
B1.2 Replacing the suction motor carbon brushes
15
B1.3 Replacing the suction motor
17
B2
SQUEEGEE UNIT
19
B2.1
A
djusting the squeegee
20
B2.2 Replacing the squeegee blades
23
B3
CHECKING AND REPLACING THE FLOATS
25
B3.1 Checking operation of the solution tank float 26
B3.2 Replacing the detergent tank float 27
B3.3 Checking operation of the dirty water tank float 28
B4.4 Replacing the dirty water tank float
29
C
DRIVE UNIT
C1
INSTRUMENT PANEL ELECTRONIC BOARD 31
C1.1 Instrument panel board, setting the type batteries
33
C1.2 Dismantling the instrument panel board
38
C2
DRIVE MOTOR - WHEELS 41
C2.1 Checking the drive motor current input
42
C2.2 Checking and replacing the carbon brushes traction motor
43
C2.3 Replacing the drive wheels, “BT” version
45
C2.4 Replacing the idle wheels
46
C2.5 Replacing the drive motor
47
C3
RELAY AND DRIVE MOTOR ELECTRICAL CONNECTIONS
49
C3.1 Checking and replacing the drive relay
49
D
ELECTRONIC BOARD - ELECTRICAL SYSTEM
D1
MACHINE'S MAIN WIRING, "PAD ASSIST" version
52
D1.1 Main wiring board components, "Pad Assist" version 53
D2
MACHINE'S MAIN WIRING, "TRACTION" version
54
D2.1 Main wiring board components, "Traction" version
55
D2.2 Machine's main wiring connections, "Traction" version 56
D3
ELECTRICAL WIRING DIAGRAMS 61
D3.1 Wiring diagram, Pad Assist version 61
D3.2 Wiring diagram Traction version 62
INDEX
Stavale
PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E

INDEX
Stavale
PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Sub
j
ect Page
E
ERROR CODES - TROUBLESHOOTING
E1 ERROR CODES 64
E1.1 Alarm messages on the instrument panel board display
64
E2 TROUBLESHOOTING
66
E2.1 Troubleshooting
66
Information on the revision numbers 68

Go to the desi
g
nated drainin
g
area and em
p
t
y
the solution and
dirt
y
water tanks usin
g
the drain
p
lu
g
s and the hose
p
rovided.
Move the machine onto flat
g
round. If necessar
y,
p
lace chocks
under the wheels.
Press the emer
g
enc
y
switch
,
for the version with drive
,
or
disable the functions b
y
movin
g
the switch to
p
osition “0”
on all other versions.
Disconnect the batter
y
from the machine’s electronics b
y
sim
p
l
y
disconnectin
g
the ne
g
ative
p
ole onl
y,
for the batter
y
versions
,
or un
p
lu
gg
in
g
from the mains
p
ower su
pp
l
y
for the cable versions.
In this Service Manual
,
the terms RIGHT and LEFT are used
to indicate the sides of the machine.
These alwa
y
s refer to the direction of travel of the machine.
In this Service Manual
,
the machine version ma
y
be written
in brackets
(
Traction
,
Pad Assist
)
or
q
uotation marks
"Traction - Pad Assist".
This note indicates that the instructions onl
y
refer to the
version s
p
ecified in brackets or
q
uotation marks.
PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
ABRUSH HEAD
i INFORMATION
Indicates particularly important instructions.
WARNING
*
1 of 68

PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
A1 BRUSH MOTOR
Fig. 1
2 of 68

PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
1
Empty the solution tank and the dirty water tank.
2
Move the machine onto flat dry and smooth flooring.
3
Press the emergency switch (Traction) or switches into position "0" (Pad Assist).
4
Make sure that the batteries on the machine are charged.
5
Use a clamp-on ammeter with an end scale reading of at least 200 amperes, as shown in Figure 2.
6
Remove the power board.
7
Move the speed knob on the instrument panel to zero, turning it anticlockwise.
8
Remove the brush.
9
Switch the ammeter to amperes and DC
A1.1 Cheking brush motor current input
Checks
Fig. 2
3 of 68

PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
8
Isolate the red wire
A
.
9
Connect the clamp to the red wire A as shown in Figure 3.
11
Checking the current with no load, i.e. without brushes.
13
Turn the emergency button clockwise, Traction version only.
14
Press the button in instrument panel per the actuator of the brushes.
15
Controlling the rotation of the brushes using the drive lever, read the CURRENT (
A
) drawn by the brush
reduction drive.
1
6
Note down the value read, and then run the following check.
Checking the current in operation, i.e. with the brushes.
17
Replace the brushes on the reduction drive, and lower the brush head to the floor.
1
8
Repeat the readings, as described above.
19
Compare the values measured against the chart below.
20
If the values are OK, replace the brush motor cover.
21
If the values do not correspond to those specified (higher):
21a
Check that the brush drive (and thus the motor) is free to rotate, without interference.
21b
Check the power supply
V
OLTAGE (
V
) directly on the motor.
21
c
Check that the motor carbon brushes are intact, see paragraph A1.2, replace if necessary.
With brushes operating 14.0 A 19.0 A
Current input A (Amperes) Min Max
No load, head lifted 4.0 A 6.0 A
21d Replace the motor or the motors.
Fig. 3
A
A
A
4 of 68

PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
1
Move the machine to the tank draining area, and empty the solution tank and the dirty water tank.
2
Move the machine onto flat and dry flooring.
3
Press the emergency switch (Traction) or switches into position "0" (Pad Assist).
4
Lower the brush head using the pedal control.
5
Disconnect the batteries from the machine's main wiring, and from each other.
6
Remove the batteries from the battery compartment.
7
Remove the brush head cover, unscrewing the four screw.
8
Lay the machine on its side.
9
Unscrew the two front screw
A
that fasten the solution tank to the machine's chassis.
10
Loosen the two rear screw Bthat fasten the solution tank to the machine's chassis.
A1.2 Replacing the brush motor carbon brushes
Dismantling
BA
BA
Fig. 4
5 of 68

PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
11
Lift the solution tank from the front, keeping the dirty water tank open.
1
2
Identify the screw Cthat secures the metal band on the brush motor.
Fig. 5
B
C
C
6 of 68

PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
13
Identify the four carbon brushes (for each individual motor), arranged 90° degrees apart.
13
Remove and check or replace the brush carbon brushes.
14
Using long-nosed pliers remove the fast-on D from its socket.
15
Use a hook to lift the spring E, and pull the carbon brush Foutwards.
1
6
Check that the dimensions of the carbon brush Flie within the tolerances
g
iven in the fi
g
ure below.
The brush must have a minimum len
g
th of 8.0 mm / 0,315 in.
17
Check the slidin
g
contact surface F1 of the carbon brushes I for wear or dama
g
e.
The surface must not be badl
y
worn or burned.
1
8
When fittin
g
new carbon brushes, com
p
are the new ones with the old ones, or check them a
g
ainst
the dimensions
g
iven in the fi
g
ure below. Onl
y
the len
g
th must be different.
The carbon brushes must all be replaced at the same time.
When fitting the carbon brushes, make sure that they slide freely in their seats.
*
DFE
Fig. 6
18,6 ± 0,1 mm
6,9 ± 0,1 mm
8,0 mm
13,8 ± 0,1 mm
Fig. 7
F1
F
FF
0,27 ± 0,004 in
0,73 ± 0,004 in
0,54 ± 0,004 in
0,32 in
7 of 68

PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
19
Blow the inside of the motor clean with a jet of compressed air, paying particular attention to the area around
the carbon brushes and to the
p
art of the rotor Gwith which the carbon brushes come into slidin
g
contact.
20
Check the rotor M for wear,
p
a
y
in
g
p
articular attention to the area of contact with the carbon brushes.
21
When repositioning the metal strap over the carbon brushes F, align the notch Hin the strap with the
corresponding reference on the motor body.
2
2
A
rrange the clamp H1 of the metal strap H as shown in the figure below when reassembling.
1
Repeat the dismantling operations in reverse.
2
To reassemble the carbon brushes, perform the dismantling operations in reverse.
3
Reposition the protection clamp, making sure it is positioned on the catch, for correct assembly see Figure 9
4
To reassemble the solution tank, perform the dismantling operations in reverse.
5
Tighten the four screw A, B to a maximum torque of 22 Nm / ~ 195 lbf in.
Reassembly
Fig. 9
Fig. 10
G
Fig. 8
H
8 of 68

PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
A2 REPLACING THE BRUSH MOTOR
Fig. 11
9 of 68

PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
1
Move the machine to the tank draining area, and empty the solution tank and the dirty water tank.
2
Dismantle the solution tank as described in paragraph A1.2
3
Disconnect the power
A
and thermal Bof the brush motor.
4
Remove the metal clamp Cfrom the solution hose, and remove the hose Dfrom the fitting on the motor.
5
Lay the machine on its side.
6
Unscrew the seven M6 x 12 mm stainless steel bolts Ethat fasten the reduction drive to the plate.
7
Remove the brush motor from the gearmotor support plate.
8
Take the reduction drive to the bench, and then remove the drive D, unscrewing it clockwise.
9
Replace the reduction drive with a new one.
A2.1 Replacing the brush motor
Dismantling
A
A
A
B
C
C
Fig. 12
10 of 68

PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
1
To assemble the new reduction drive, perform the dismantling operations in reverse.
2
Warning, tighten the seven screws E to a maximum torque of 7.5 Nm / ~ 66,4 lbf in, and always
place the Grover washers between the plate and the screws.
3
A
pply grease to the brush motor pin before screwing the driver counterclockwise
Make sure that the brush rotate in an anticlockwise direction.
Reassembly
*
E
CHEMͲDOSECONNECTOR
D
D
Fig. 14
Fig. 13
11 of 68

PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
Go to the desi
g
nated drainin
g
area and em
p
t
y
the solution and
dirt
y
water tanks usin
g
the drain
p
lu
g
s and the hose
p
rovided.
Move the machine onto flat
g
round. If necessar
y,
p
lace chocks
under the wheels.
Press the emer
g
enc
y
switch
,
for the version with drive
,
or
disable the functions b
y
movin
g
the switch to
p
osition “0”
on all other versions.
Disconnect the batter
y
from the machine’s electronics b
y
sim
p
l
y
disconnectin
g
the ne
g
ative
p
ole onl
y,
for the batter
y
versions
,
or un
p
lu
gg
in
g
from the mains
p
ower su
pp
l
y
for the cable versions.
In this Service Manual
,
the terms RIGHT and LEFT are used
to indicate the sides of the machine.
These alwa
y
s refer to the direction of travel of the machine.
In this Service Manual
,
the machine version ma
y
be written
in brackets
(
Traction
,
Pad Assist
)
or
q
uotation marks
"Traction - Pad Assist".
This note indicates that the instructions onl
y
refer to the
version s
p
ecified in brackets or
q
uotation marks.
*
WARNING
i INFORMATION
Indicates particularly important instructions.
BSUCTION UNIT - TANKS
12 of 68

PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
SUCTION MOTOR
B1
Fig. 15
13 of 68

PLDC04452
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
1
Move the machine onto flat and dry flooring.
2
Press the emergency switch (Traction) or switches into position "0" (Pad Assist).
3
Make sure that the batteries on the machine are charged.
4
Use a clamp-on ammeter with an end scale reading of at least 200 amperes, as shown in Figure 16.
5
Remove the suction hose
A
from the squeegee, see Figure 17.
6
Lift and turn the top dirty water tank.
7
Isolate one of the two power wires Bto the suction motor.
8
Connect the ammeter clamp around one of the two wires B as shown in Figure 18.
9
Switch the ammeter to amperes and DC.
10
Turn the ignition key on the mushroom-shaped switch clockwise to connect power.
11
Start the suction motor by pressing the corresponding button on the instrument panel.
1
2
Read the CURRENT (A) drawn by the suction motor.
13
Compare the values measured against the chart below.
14
If all the values are normal close the top dirty water tank again.
15
If the measurements do not correspond to those specified:
15a
Check that the suction hose Bis in good condition, is not crushed and is not blocked inside.
15b
Check that the motor carbon brushes are intact, see paragraph B1.2, if necessary replace them
with new ones.
15
c
Replace the suction motor with a new one, see paragraph B1.3.
Current input A (amperes) Min Max
No load (hose open) 15.0 A
B1.1 Checking the suction motor current input
19.0 A
Fig. 16
BFig. 18
Fig. 17
A
B
14 of 68