Nobles Tennant S7 Operating manual

PLDC04364
REVISION DATE
December 16, 2020
DATE
December 17, 2020
TECHNICAL OFFICE
S7 / Scout 7
TECHNICAL SERVICE MANUAL

PLDC04364
REVISION 00
December 16, 2020
TECHNICAL OFFICE
Contents
A1.1 Checking main brush motor current draw. ....................................................................7
A1.2 Checking and replacing the main brush motor carbon brushes....................................8
A1.3 Replacing the main brush motor...................................................................................11
A1.4 Replacing the main brush ............................................................................................13
A1.5 Adjusting the height of the main brush..........................................................................14
A1.6 Checking for wear on side brush drive belt...................................................................15
A1.7 Side brush belt replacement ..........................................................................................17
B1.1 Checking suction motor current draw............................................................................21
B1.2 Replacing the suction motor...........................................................................................23
B1.3 Checking and replacing the suction motor carbon brushes...........................................27
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%5HPRYLQJWKH¿OWHUVKDNHUPRWRU ..................................................................................33
C1.1 Checking drive motor current draw...............................................................................36
C1.2 Check drive belt wear status..........................................................................................38
C1.3 Replacing the drive belt .................................................................................................39
C1.4 Replacing the drive motor..............................................................................................41
C1.5 Checking and replacing the drive motor carbon brushes ..............................................43
D1.1 Inspection and replacement of control panel board F2 fuse (1.6A F)............................49
D1.2 Checking and replacing control panel card 50A fuse F1 ...............................................51
D1.3 Disassembly and removal of the control panel board....................................................53
E1.1 Troubleshooting.............................................................................................................57
TECHNICAL SERVICE MANUAL REVISIONS - UPDATES..................................................61

PLDC04364
REVISION 00
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TECHNICAL OFFICE

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TECHNICAL OFFICE
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*IMPORTANT
Take the machine to the waste disposal area, clean the
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Important information
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A BRUSH UNIT

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A1 MAIN BRUSH MOTOR / DRIVE MOTOR
The motor of the centre brush or drive motor is equipped with a right angle or bevel helical
gear reducer with worm gear drive, the rotor shaft having a double-start thread. The maximum
rotational speed at the gear reducer output shaft is 210 rpm. The rated power of the motor
is 25.5W, while the voltage is 12V DC. The maximum current draw of the motor at starting is
57A with a maximum torque of 21 N · m - 185.9 lbf · in, while the motor at no load draws 4.0A.
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of solids and liquids.
Themotor isequipped withreplaceable carbonbrushes. Withthemotormountedtothemachine,
the brush must be driven in anticlockwise rotation, otherwise it will not operate correctly. Check
the current draw to assess the need for motor disassembly to replace the carbon brushes.
i

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3Turn the front cowling and, after undoing the screws, remove the top cowling to access the battery compartment.
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7Remove the left side guard and locate the brush motor.
8Pick out the Red wire of the centre brush motor and apply the clamp-on ammeter to it.
9Operate the main brush motor from the control panel by turning the key switch to the “I” position
10 Read the value on the clamp-on ammeter display and compare it against the values shown in the table.
11 If the value falls within the range indicated in the table, disconnect the instrument and reinstate the side guard
and top cover of the machine.
12 Conversely, if the value is at variance with those indicated in the table, proceed to make the following checks.
13 Lift the side brush and check that the current draw under no-load conditions is within the values in the table.
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the motor and gear reducer for noise and/or the motor carbon brushes for wear.
13b Replace the brush motor with a new one.
Carry out the test with the side brush disengaged (the control lever on the control panel must
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*
Current draw A (amperes) Min Max
1RORDGEUXVKUDLVHG 2.6 A 3.2 A
/RDGDSSOLHGEUXVKRSHUDWLQJ 7.8 A 9.5 A
Carry out the test with the machine at standstill: as the brush rotates in the direction opposite
to the direction of travel, this could lead to an increase in the current draw value.
*
89
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Disassembly
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3Turn the front cowling and, after undoing the screws, remove the top cowling to access the battery compartment.
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5Disconnect the two connectors of the three motors.
6Remove the left side guard and locate centre brush motor.
7Unscrew the two nuts and remove the motor cap taking care not to lose the shims placed on the rotor.
8Rotate the spring so that you can remove the carbon brushes.
9Remove the carbon brushes from their seat and check their dimensions.
10 Unsolder the carbon brush leads from their respective tags only if they need to be replaced after checking dimen-
sions.
To verify the extent of wear on the carbon brushes and replace them if necessary, simply
remove the motor end cap.
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Checks
11 Check the sliding contact surface of the carbon brushes for signs of abnormal wear or burning and possibly re-
place them even if still within tolerance.
12 Measure the carbon brush to determine wear, and then compare the values against those shown below.
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14 In the event that the measurement is close to the value indicated in the table, replace the carbon brush after
detaching it from the end cap.
15 Blow the inside of the motor clean with a jet of compressed air, paying particular attention to the area around the
carbon brushes and the rotor where the carbon brushes slide.
16 Check wear in the places where the carbon brushes slide before replacement. A damaged rotor would cause
premature wear of the new carbon brushes.
Both carbon brushes must be replaced at the same time.
*
Always check that the new carbon brushes are the same shape and
size as those being replaced, apart, obviously, from the length, and
that they slide freely in their seats.
*
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Reassembly
1Position the shims on the rotor in the correct order: the white one (usually one) resting on the bearing and the
black one (one or two) between the gear reducer and the bearing (depending on the thickness) and resting on
the gear reducer.
2Solder the leads of the carbon brushes to the same position where the power leads are soldered.
3Shift the springs to facilitate installation of the carbon brushes on the rotor.
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the rotor.
5Proceed with reassembly, repeating the steps of the disassembly sequence in reverse order.
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Disassembly
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3Turn the front cowling and, after undoing the screws, remove the top cowling to access the battery compartment.
4Disconnect the battery and remove it.
5Disconnect the two connectors of the three motors from the main wiring and release the cables from the clamps.
6Remove the left side guard and locate brush motor.
7Remove the front and rear debris bins, then lay the machine on its side in order to reach the central brush.
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Reassembly
1In case of replacement of the complete brush motor, remember to remove the keyway.
2Replace the brush motor.
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brush motor.
11 Remove the motor and take it to the bench for overhaul or complete replacement.
12 When disassembling, pay attention to the tab on the brush motor shaft. In case of replacement of the brush motor
it must be reused for the new motor.
9
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Disassembly
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3Turn the front cowling and, after undoing the screws, remove the top cowling to access the battery compartment.
4Disconnect and remove the battery.
5Tilt the machine backwards to reach the main brush.
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7Replace the brush.
The brush will need to be replaced generally as the result of normal wear.
*
Reassembly
1To reassemble, repeat the disassembly operations in reverse order.
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Adjustment
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3Turn the front cowling and pick out the adjustment knob.
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5If the brush is correctly adjusted, the bristles will be slightly bent backwards with respect to the rolling direction,
which must be in the opposite direction to the advancement, to ensure a slight pressure on the ground.
Always check the consumption of the centre brush and adjust the height as needed.
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bristle to the side opposite to the rolling direction.
*
When replacing the brush with a new one, don’t forget to restore the original positions of the
knob and in any case to adjust the brush.
*
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In case of disassembly of both wheels together, remember or identify the respective disassembly
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makes it idle only in one direction of rotation, allowing the machine to turn.
*
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Disassembly
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3Turn the front cowling and, after undoing the screws, remove the top cowling to access the battery compartment.
4Disconnect and remove the battery.
5Lie the machine down on its left side to facilitate disassembly of the plastic side.
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8To undo the screw that secures the wheel, hold the wheel steady and unscrew or use a pulse screwdriver.
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10 Unscrew the four Allen screws, the self-tapping screw and remove the right side guard.
11 Check the round belt for wear.
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Reassembly
1To reassemble, repeat the disassembly operations in reverse order.

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Take care when removing and assembling the belt from/onto the pulley; use protective leather
work gloves.
*
The belts are usually replaced after breakage. However, in order to avoid machine downtime,
it may be useful to replace the belts in advance, before they break. Belt wear is showing on
the surface in contact with the pulleys, smoother and with small cracks, in addition to loss of
elasticity with consequent elongation of the belt.
If the belt shows an excessive elongation, even if still intact, it is recommended to replace it to
avoid slipping during work.
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Disassembly
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3Proceed with disassembly until reaching the belt as indicated in the previous paragraph.
4If necessary, unscrew the bolt securing the tensioning roller and slide it towards the rear of the machine in order
to facilitate removal of the belt.
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unseat from the pulley.
6Move the side brush control lever to position “1”.
5
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7Unscrew the pin of the brush lifting arm, then move the arm forward to release it from the shaft.
8Remove the worn belt from the drive shaft with driven gear.
Reassembly
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4Return the tension roller to the bottom of the adjustment slot and tighten the bolt.
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6To complete the reassembly, repeat the disassembly steps in reverse order.
30 N·m / 265.5 lbf·in
78

PLDC04364
REVISION 00
December 16, 2020
TECHNICAL OFFICE
December 17, 2020 19 of 61
*IMPORTANT
Take the machine to the waste disposal area, clean the
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i INFORMATION
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B SUCTION UNIT

PLDC04364
REVISION 00
December 16, 2020
TECHNICAL OFFICE
December 17, 2020 20 of 61
B1 SUCTION MOTOR
The function of the extractor fan is to vacuum up the dust raised by the revolving brush during
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be left or anticlockwise. The maximum rotation is 3500 rpm, while the electric motor rated power
is 30 W.
The motor is a “brushed” type, equipped with two replaceable carbon brushes. In the event
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standard current draw of the motor is ~4.8A with a peak value of ~14A on starting.
The replacement of the complete extractor or of the motor alone requires aligning the fan with
respect to the hole in the intake casing.
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