Tennant T390 Operating manual

TECHNICAL OFFIC
E
PLDC04453
REVISION DAT
E
December 23, 2019
DAT
E
December 23, 2020
Stavale
T390
TECHNICAL SERVICE MANUAL

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.
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
Stavale
PLDC04453
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E

A
B
C
D
E
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
Brush head
A2 Replacing the brush motor
Checking brush motor current
imput,
Replacing the carbon brushes
A1
Relay and drive motor
electrical connections
Circuit boards
Electrical system
D3 Wiring diagram
D1
E1 Error codes
D2 Main Wiring Traction Version
Main Wiring Pad Assist

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
A1.3 Replacing the brush motor 8
BSUCTION UNIT - TANKS
B1
SUCTION MOTOR 13
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
B3.4 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
32
C1.2 Dismantling the instrument panel board
37
C2
DRIVE MOTOR - WHEELS 39
C2.1 Checking the drive motor current input
40
C2.2 Checking and replacing the carbon brushes traction motor
41
C2.3 Replacing the complete drive unit (motor + reduction unit)
44
C2.4 Replacing the drive unit components
48
C2.5 Replacing the drive wheels
56
C3
RELAY AND DRIVE MOTOR ELECTRICAL CONNECTIONS
57
C3.1 Checking and replacing the drive relay
57
D
ELECTRONIC BOARD - ELECTRICAL SYSTEM
D1
MACHINE'S MAIN WIRING
60
D1.1 Main wiring board components 61
D1.2 Machine’s main wiring connections
62
D2
ELECTRICAL WIRING DIAGRAMS 67
D2.1 Wiring diagram Traction version 67
INDEX
Stavale
PLDC04453
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E

INDEX
Stavale
PLDC04453
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Sub
j
ect Page
E
ERROR CODES - TROUBLESHOOTING
E1 ERROR CODES 69
E1.1 Alarm messages on the instrument panel board display
69
E2 TROUBLESHOOTING
71
E2.1 Troubleshooting
71
Information on the revision numbers 73

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.
PLDC04453
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
ABRUSH HEAD
i INFORMATION
Indicates particularly important instructions.
WARNING
*
1 of 73

PLDC04453
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
A1 BRUSH MOTOR
Fig. 1
2 of 73

PLDC04453
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
1
Em
p
t
y
the solution tank and the dirt
y
water tank.
2
Brin
g
to zero the amount of water dis
p
ensed.
3
Move the machine onto flat dr
y
and smooth floorin
g
.
4
Press the emer
g
enc
y
switch to switch off all the functions.
5
Make sure that the batteries on the machine are char
g
ed.
6
Use a clam
p
-on ammeter with an end scale readin
g
of at least 200 am
p
eres, as shown in Fi
g
ure 1.
7
Remove the brush head cover.
8
Lift one of the machine’s two drive wheels
,
see
p
ara
g
ra
p
h C 2.1.
9
Move the s
p
eed knob on the instrument
p
anel to zero, turnin
g
it anticlockwise.
10
Remove the brush head cover, unscrewing the four screw.
11
Switch the ammeter to am
p
eres and DC.
CHECKING POWER INPUT FOR EACH INDIVIDUAL MOTOR
Alternatively, electrically disconnect one motor, and then check the power input of the
other motor, both at no load and when working.
Checkin
g
the current with no load
,
i.e. without brushes.
1
2
Remove the brushes and lower the head usin
g
the s
p
ecial
p
edal control.
13
Turn the emer
g
enc
y
button clockwise.
14
Press the button on the instrument
p
anel to activate the brushes.
15
Controllin
g
the rotation of the brushes usin
g
the drive lever
,
read the CURRENT
(
A
)
drawn by the brush reduction drive; for practicality, hold the lever in place with string.
1
6
Note down the value read, and then run the followin
g
check.
Checking the current in operation, i.e. with the brushes.
17
Re
p
lace the brushes on the reduction drive, and lower the brush head to the floor.
1
8
Re
p
eat the readin
g
s, as described above.
19
Com
p
are the values measured a
g
ainst the chart below.
20
If the values are OK, re
p
lace the brush motor cover.
21
If the values do not corres
p
ond to those s
p
ecified
(
hi
g
her
)
:
21a
Check that the brush drive
(
and thus the motor
)
is free to rotate, without interference.
21b
Check the
p
ower su
pp
l
y
V
OLTAGE
(
V
)
directl
y
on the
p
oles of the motor.
21
c
Check that the motor carbon brushes are intact, re
p
lace if necessar
y
.
21d
Re
p
lace the defective motor or motors.
A1.1 Checking current input
Fig. 2
Fig. 3
3 of 73

PLDC04453
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
(*) see "INFORMATION" at the start of the chapter
14.0 A
No load, head lifted 4.0 A
With brushes operating
Current input A (Amperes) Min Max
6.0 A
19.0 A
A - Disconnect the right motor
B - Disconnect the black wire from the left motor C - Connect the black wire to the right motor D - Check the right motor
CHECKING THE RIGHT MOTOR (*)
A - Disconnect the right motor CHECKING THE LEFT MOTOR (*)
B - Check the left moto
r
Fig. 4
Fig. 5
4 of 73

PLDC04453
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 to switch off all the functions.
4
Lower the brush head using the pedal control.
5
Disconnect the batteries from the machine's main wiring.
6
Remove the brush head cover, unscrewing the four screw.
7
Identify the two screw
A
that secures the metal band on the brush motor.
8
Unscrew the screw
A
and remove the metal band on the brush motor
A1.2 Replacing the brush motor carbon brushes
Dismantling
A
Fig. 6
Fig. 7
5 of 73

PLDC04453
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
9
Identify the four carbon brushes (for each individual motor), arranged 90° degrees apart.
10
Remove and check or replace the brush carbon brushes.
11
Using long-nosed pliers remove the fast-on B from its socket.
1
2
Use a hook to lift the spring C, and pull the carbon brush Doutwards.
13
Check that the dimensions of the carbon brush Elie 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.
14
Check the slidin
g
contact surface D1 of the carbon brushes I for wear or dama
g
e.
The surface must not be badl
y
worn or burned.
15
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.
*
BDC
Fig. 8
18,6 ± 0,1 mm
6,9 ± 0,1 mm
8,0 mm
13,8 ± 0,1 mm
Fig. 9
D1
D
DD
0,27 ± 0,004 in
0,73 ± 0,004 in
0,54 ± 0,004 in
0,32 in
6 of 73

PLDC04453
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
1
6
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 Fwith which the carbon brushes come into slidin
g
contact.
17
Check the rotor M for wear,
p
a
y
in
g
p
articular attention to the area of contact with the carbon brushes.
1
8
When repositioning the metal strap over the carbon brushes D, align the notch Ein the strap with the
corresponding reference on the motor body.
19
A
rrange the clamp E1 of the metal strap E 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 1
4
To reassemble the solution tank, perform the dismantling operations in reverse.
Reassembly
Fig. 11
Fig. 12
F
Fig. 10
E
E1
7 of 73

PLDC04453
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
1
Move the machine to the tank drainin
g
area, and em
p
t
y
the solution tank and the dirt
y
water tank.
2
Move the water deliver
y
control to zero
3
Move the machine onto flat and dr
y
floorin
g
.
4
Press the emer
g
enc
y
switch.
5
Remove the brush motor cover
,
unscrewin
g
the four screws
A
on the sides.
6
Lower the head to sim
p
lif
y
the dismantlin
g
o
p
erations.
7
Disconnect the cables Bon the motor and the thermal cables C.
A1.3 Replacing the brush motor
Dismantling
Fig. 13
AA
CHEMͲDOSECONNECTOR
B
C
Fig. 14
8 of 73

PLDC04453
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
8
Lift the machine on the ri
g
ht side.
9
Unscrew the metal clam
p
Dfrom the solution hose E
,
and remove the latter from the distributor.
10
Unscrew the 4 bolts Fand Gthat fasten the head
,
checkin
g
the
p
ositions of the bushin
g
s.
11
Pull the machine backwards, so as to release the head.
F
G
E
D
F
FG
G
Fig. 16
Fig. 15
9 of 73

PLDC04453
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
1
2
Disconnect the two motors electricall
y
between each other, both the
p
ower su
pp
l
y
and the thermals.
14
Ti
p
over the head and dismantle drive disk/disks O.
15
Unscrew the bolt P that fastens the drive to the shaft.
1
6
Lift the drive O
,
with the hel
p
of a hammer
p
lastic or a
p
uller.
17
Pa
y
attention to the tab Qthat holds the disk to the shaft.
1
8
Unscrew the seven bolts R
(
on each motor
)
that fasten the reduction drive to the head
p
late.
19
Re
p
lace the reduction drive with a new one.
O
P
Q
R
O
Fig. 18
Q
Fig. 17
Fig. 19
10 of 73

PLDC04453
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
1
To assemble the new reduction drive/drives,
p
erform the dismantlin
g
o
p
erations in reverse.
2
Warning, tighten the seven bolts R to a maximum torque of 7.5 Nm ~ 66,4 lbf in,
and always place the Grover washers between the plate and the bolts.
3
Warning, always fit the bolt P with the Grover washer and a drop of thread lock,
tighten to a maximum torque of 25.5 Nm ~ 225,7 lbf in.
3
Res
p
ect the
p
ositionin
g
of the reduction drives on the brush head
p
late, see Fi
g
ure 20.
Check the direction of rotation of the brushes see Fi
g
ure 46, the ri
g
ht brush must rotate anticlockwise,
and the left brush clockwise. If this is not the case, reverse the electrical cables to the motor
that is rotatin
g
in the wron
g
direction,
p
a
y
in
g
s
p
ecial care to the motor that is
p
owered directl
y
from
the machine’s wirin
g
, as reversin
g
the cables on this will also reverse the rotation of the other motor.
*
Reassembly
Fig. 20
11 of 73

PLDC04453
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.
BSUCTION UNIT
*
WARNING
i INFORMATION
Indicates particularly important instructions.
12 of 73

PLDC04453
REVISION 00
December 23, 2020
TECHNICAL OFFIC
E
Stavale
SUCTION MOTOR
B1
Fig. 21
13 of 73

PLDC04453
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.
B1.1 Checking the suction motor current input
Current input A (amperes) Min Max
No load (hose open) 15.0 A 19.0 A
Fig. 22
BFig. 24
Fig. 23
A
B
14 of 73