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