KENT razor blade 26D, razor blade 28D, 908 7101 020, razor blade 28C, 908 7099 020 Service Manual
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Simple. Clean.
Razor Blade 26D/28D/28C
SERVICE MANUAL
Kent models:
908 7099 020 - 908 7100 020 - 908 7101 020
909 6510 000(3) 2007-12
SERVICE MANUAL
ENGLISH
Razor Blade 26D / 28D / 28C 909 6510 000(3)2007-12
1
TABLE OF CONTENTS
GENERAL INFORMATION .............................................................................................................................................. 3
CONVENTIONS .............................................................................................................................................................................. 3
MACHINE LIFTING ......................................................................................................................................................................... 3
MACHINE TRANSPORTATION ....................................................................................................................................................... 3
OTHER AVAILABLE MANUALS ...................................................................................................................................................... 3
SAFETY ........................................................................................................................................................................................... 4
SYMBOLS ....................................................................................................................................................................................... 4
GENERAL SAFETY PRECAUTIONS .............................................................................................................................................. 4
TECHNICAL DATA ........................................................................................................................................................................... 6
MAINTENANCE ............................................................................................................................................................... 8
SCHEDULED MAINTENANCE ....................................................................................................................................................... 8
SCHEDULED MAINTENANCE TABLE ........................................................................................................................................... 8
MACHINE NOMENCLATURE ......................................................................................................................................................... 9
DETERGENT SUPPLY SYSTEM................................................................................................................................... 13
SOLUTION/WASHING WATER SYSTEM AND TANK CLEANING ............................................................................................... 13
SOLUTION/WASHING WATER FILTER CLEANING .................................................................................................................... 13
SOLUTION/WASHING WATER SYSTEM SOLENOID VALVE/TAP/FILTER DISASSEMBLY/ASSEMBLY .................................. 14
TROUBLESHOOTING ................................................................................................................................................................... 16
BRUSHING SYSTEM ..................................................................................................................................................... 17
BRUSH/CYLINDRICAL BRUSH CLEANING ................................................................................................................................. 17
SIDE SKIRT CHECK (AND REPLACEMENT) .............................................................................................................................. 17
BRUSH/PAD-HOLDER DECK OR CYLINDRICAL BRUSH DECK DISASSEMBLY/ASSEMBLY ................................................. 18
BRUSH MOTOR ELECTRICAL INPUT CHECK ............................................................................................................................ 18
BRUSH MOTOR CARBON BRUSH CHECK AND REPLACEMENT ............................................................................................ 20
BRUSH/PAD-HOLDER MOTOR DISASSEMBLY/ASSEMBLY ..................................................................................................... 21
CHECK/REPLACEMENT/ADJUSTMENT OF DRIVING BELTS BETWEEN MOTORS AND CYLINDRICAL BRUSHES ............ 24
BRUSH DECK LIFTING/LOWERING ACTUATOR DISASSEMBLY/ASSEMBLY ......................................................................... 26
TROUBLESHOOTING ................................................................................................................................................................... 28
RECOVERY WATER SYSTEM ...................................................................................................................................... 29
RECOVERY WATER TANK AND VACUUM GRID AUTOMATIC SHUT-OFF FLOAT CLEANING ................................................ 29
VACUUM SYSTEM MOTOR ELECTRICAL INPUT CHECK ......................................................................................................... 30
VACUUM SYSTEM MOTOR CARBON BRUSH CHECK AND REPLACEMENT .........................................................................31
VACUUM SYSTEM MOTOR DISASSEMBLY/ASSEMBLY ........................................................................................................... 32
SQUEEGEE CLEANING/CHECK AND BLADE REPLACEMENT.................................................................................................33
SQUEEGEE LIFTING CABLE SLIDING SHOE LUBRICATION....................................................................................................34
SQUEEGEE LIFTING ACTUATOR DISASSEMBLY/ASSEMBLY ................................................................................................. 35
SQUEEGEE LIFTING CABLE DISASSEMBLY/ASSEMBLY ......................................................................................................... 36
TROUBLESHOOTING ................................................................................................................................................................... 37
ENGLISH
SERVICE MANUAL
2
909 6510 000(3)2007-12 Razor Blade 26D / 28D / 28C
TABLE OF CONTENTS
PARKING BRAKE SYSTEM .......................................................................................................................................... 38
PARKING BRAKE CHECK ............................................................................................................................................................ 38
ELECTROMAGNETIC BRAKE DISASSEMBLY/ASSEMBLY (Machines up to January 2007) ..................................................... 39
ELECTROMAGNETIC BRAKE AND DISC WITH BRAKING MASSES DISASSEMBLY/ASSEMBLY
(Machines after January 2007) ...................................................................................................................................................... 41
TROUBLESHOOTING ................................................................................................................................................................... 43
DRIVE SYSTEM ............................................................................................................................................................. 44
DRIVING WHEEL COVER DISASSEMBLY/ASSEMBLY (Machines up to January 2007) ............................................................ 44
DRIVING WHEEL COVER DISASSEMBLY/ASSEMBLY (Machines after January 2007) ............................................................ 45
DRIVE SYSTEM MOTOR ELECTRICAL INPUT CHECK (Machines up to January 2007) ........................................................... 47
DRIVE SYSTEM MOTOR ELECTRICAL INPUT CHECK (Machines after January 2007)............................................................48
DRIVE SYSTEM MOTOR CARBON BRUSH CHECK AND REPLACEMENT (Machines up to January 2007) ........................... 49
DRIVE SYSTEM MOTOR CARBON BRUSH CHECK AND REPLACEMENT (Machines after January 2007) ............................ 50
DRIVE SYSTEM MOTOR SLIDING CONTACT CHECK AND REPLACEMENT (Machines after January 2007)......................... 51
DRIVE SYSTEM MOTOR DISASSEMBLY/ASSEMBLY (Machines up to January 2007) ............................................................. 53
DRIVE SYSTEM MOTOR, BEARING AND GASKET DISASSEMBLY/ASSEMBLY (Machines after January 2007) .................... 54
FORWARD/REVERSE GEAR PEDAL DISASSEMBLY/ASSEMBLY ............................................................................................ 57
FORWARD/REVERSE GEAR PEDAL POTENTIOMETER CHECK AND ADJUSTMENT ........................................................... 58
SPEED REDUCTION SENSOR CHECK/ADJUSTMENT ............................................................................................................. 59
SPEED REDUCTION SENSOR REPLACEMENT ........................................................................................................................ 60
DRIVER'S SEAT SAFETY MICROSWITCH OPERATION CHECK .............................................................................................. 62
DRIVER'S SEAT SAFETY MICROSWITCH REPLACEMENT ...................................................................................................... 62
TROUBLESHOOTING ................................................................................................................................................................... 63
OTHER SYSTEMS ......................................................................................................................................................... 65
SCREW AND NUT TIGHTENING CHECK .................................................................................................................................... 65
FRONT FAIRING DISASSEMBLY/ASSEMBLY ............................................................................................................................. 66
ELECTRICAL SYSTEM ................................................................................................................................................. 68
MACHINE WORKING HOUR CHECK .......................................................................................................................................... 68
HOUR COUNTER RESET PROCEDURE ..................................................................................................................................... 68
BATTERY MAINTENANCE AND RECHARGING .......................................................................................................................... 68
BATTERY DISASSEMBLY/ASSEMBLY ........................................................................................................................................ 68
FUSE CHECK/REPLACEMENT .................................................................................................................................................... 69
DRIVE SYSTEM ELECTRONIC BOARD REPLACEMENT .......................................................................................................... 70
FUNCTION ELECTRONIC BOARD REPLACEMENT .................................................................................................................. 71
DASHBOARD ELECTRONIC BOARD REPLACEMENT .............................................................................................................. 72
TROUBLESHOOTING ................................................................................................................................................................... 73
FUNCTION ELECTRONIC BOARD ERROR CODES .................................................................................................................. 73
COMPONENT LAYOUT ................................................................................................................................................................ 78
WIRING DIAGRAM ........................................................................................................................................................................ 81
SERVICE MANUAL
ENGLISH
Razor Blade 26D / 28D / 28C 909 6510 000(3)2007-12
3
GENERAL INFORMATION
GENERAL INFORMATION
CONVENTIONS
Forward, backward, front, rear, left or right are intended with reference to the operator’s position, that is to say in driving position.
MACHINE LIFTING
WARNING!
Do not work under the lifted machine without supporting it with safety stands.
MACHINE TRANSPORTATION
WARNING!
Before transporting the machine, make sure that:
All doors and cases are closed.
The ignition key is removed.
The machine is securely fastened to the means of transport.
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OTHER AVAILABLE MANUALS
The following manuals are available at Kent Literature Service Department:
RAZOR BLADE Instructions for Use Manual 26D-28D-28C – 909 6457 000
RAZOR BLADE Spare Parts List 26D-28D-28C – 909 6458 000
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ENGLISH
SERVICE MANUAL
4
909 6510 000(3)2007-12 Razor Blade 26D / 28D / 28C
GENERAL INFORMATION
SAFETY
The following symbols indicate potentially dangerous situations. Always read this information carefully and take all necessary
precautions to safeguard people and property.
SYMBOLS
DANGER!
It indicates a dangerous situation with risk of death for the operator.
WARNING!
It indicates a potential risk of injury for people or damage to objects.
CAUTION!
It indicates a caution or a remark related to important or useful functions. Pay careful attention to the
paragraphs marked by this symbol.
NOTE
It indicates a remark related to important or useful functions.
CONSULTATION
It indicates the necessity to refer to the User Manual before performing any procedure.
GENERAL SAFETY PRECAUTIONS
Specic warnings and cautions to inform about potential damages to people and machine are shown below.
DANGER!
Before performing any maintenance/repair procedure drive the machine on a level ground, remove the
ignition key and disconnect the battery.
This machine must be used by properly trained and authorized personnel only.
Keep the battery away from sparks, ames and incandescent material. During the normal operation,
explosive gases are released.
Do not wear jewelry when working near electrical components.
Do not work under the lifted machine without supporting it with safety stands.
Do not operate the machine near toxic, dangerous, ammable and/or explosive powders, liquids or vapors.
Battery charging produces highly explosive hydrogen gas. Keep the tanks open during battery charging
and perform this procedure in well-ventilated areas and away from naked ames.
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SERVICE MANUAL
ENGLISH
Razor Blade 26D / 28D / 28C 909 6510 000(3)2007-12
5
GENERAL INFORMATION
GENERAL SAFETY PRECAUTIONS (Continues)
WARNING!
Carefully read all the instructions before carrying out any maintenance/repair procedure.
Before using the battery charger, ensure that frequency and voltage values, indicated on the machine serial
number plate, match the electrical mains voltage.
To reduce the risk of re, electric shock, or injury, do not leave the machine unattended when it is plugged
in. Unplug the machine from the electrical mains when not in use and before performing maintenance
procedures.
To avoid electric shock, do not expose to rain. Store the machine indoors.
Do not allow to be used as a toy. Close attention is necessary when used near children.
Use only as described in this Manual. Use only Kent’s recommended accessories.
Do not use with damaged power supply cable or plug. If the machine is not working as it should, has been
damaged, left outdoors or dropped into water, return it to the Service Center.
Do not pull or carry the machine by the supply cable; never use the power supply cable as a handle. Do not
close a door on the supply cable, or pull the supply cable around sharp edges or corners. Do not run the
machine on the supply cable.
Keep the power supply cable away from heated surfaces.
Take all necessary precautions to prevent hair, jewelry and loose clothes from being caught by the machine
moving parts.
Do not smoke while charging the batteries.
Do not leave the machine unattended with the ignition key inserted and without being sure that it cannot
move independently.
Do not use the machine on slopes with a gradient exceeding the specications.
Do not wash the machine with direct or pressurised water jets, or with corrosive substances.
Do not use the machine in particularly dusty areas.
While using this machine, take care not to cause damage to people or objects.
The machine storage temperature must be between +32°F and +104°F (0°C and +40°C).
The machine operating temperature must be between +32°F and +104°F (0°C and +40°C).
The humidity must be between 30% and 95%.
Always protect the machine against the sun, rain and bad weather, both under operation and inactivity
condition.
Do not use the machine as a means of transport.
Do not use the machine on slopes with a gradient exceeding the specications.
Do not allow the brushes to operate while the machine is stationary to avoid damaging the oor.
In case of re, use a powder re extinguisher, not a water one.
Do not bump into shelves or scaffoldings, particularly where there is a risk of falling objects.
Do not remove or modify the plates afxed to the machine.
If parts must be replaced, require ORIGINAL spare parts from a Dealer or Authorised Retailer.
The machine must be disposed of properly, because of the presence of toxic-harmful materials (batteries,
etc.), which are subject to standards that require disposal in special centers (see Scrapping chapter in the
User Manual).
Do not allow any object to enter into the openings. Do not use the machine if the openings are clogged.
Always keep the openings free from dust, hairs and any other foreign material which could reduce the air
ow.
This machine cannot be used on roads or public streets.
Pay attention during machine transport when temperature is below freezing point. The water in the recovery
tank or in the hoses could freeze and seriously damage the machine.
Use brushes and pads supplied with the machine and those specied in the User Manual. Using other
brushes or pads could reduce safety.
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ENGLISH
SERVICE MANUAL
6
909 6510 000(3)2007-12 Razor Blade 26D / 28D / 28C
GENERAL INFORMATION
TECHNICAL DATA
GENERAL TECHNICAL DATA
Description 26D 28D - 28C
Cleaning width 26.0 in (660 mm) 29.1 in (740 mm)
Squeegee width 32.7 in (830 mm) 33.9 in (860 mm)
Solution tank capacity 20 gal (75 liters)
Recovery water tank capacity 20 gal (75 liters)
Min/max solution ow 0,29 - 0,9 gal/min (1,1 - 3,4 litres/min)
Solution/clean water autonomy 0,29 gal/min (1,1 litres/min): ~ 68 min Media/Average
Rear wheel diameter (on xed axle) 11.8 in (300 mm)
Wheel specic pressure on the oor (*) front116 psi (0.8 N/mm2) - rear 145 psi (1.0 N/mm2)
Front steering, driving and braking wheel diameter 9.8 in (250 mm)
Minimum turning radius 40,5 in (1030 mm)
Vacuum system motor power 0.68 hp (500 W)
Drive system motor power 0.80 hp (600 W)
Drive speed (variable) 0 to 3.7 mph (0 to 6 km/h)
Max gradeability 16% (7,2°)
Working gradeability 2% (1°)
Sound pressure level at the operator’s position
(ISO 11201, ISO 4871) (LpA)
60,8 dB(A) ± 3dB(A)
Sound pressure level to the machine
(ISO 3744, ISO 4871) (LwA)
82,4 dB(A)
Vibration level at the operator’s arms (ISO 5349-1) (**) 9.05 - 295.27 in/s2 (0.23 – 7.5 m/s2)
Vibration level at the operator’s body (ISO 2631-1) (**) < 47.24 in/s2 (1.2 m/s2)
Batteries
24 V battery box, 240 Ah/5 h (WET) 240 Ah C5
24 V battery box, 240 Ah/5 h (GEL) (optional) 240 Ah C5
4 6 V batteries, 180 Ah/5 h (WET) 180 Ah C5
4 6 V batteries, 180 Ah/5 h (GEL) (optional) 180 Ah C5
Standard batteries autonomy ~ 3 h
Maximum battery compartment size
24 V battery box: 14.0 x 23.9 x 14.6 in (355 x 606 x 370 mm)
4 6 V batteries, with case: 20.8 x 15.0 x 11.8 in (530 x 380 x 300 mm)
Total consumption in work condition 62 A
Vacuum system capacity 1,76 MPa (1,800 mm H2O)
Machine height 49.2 in (1,250 mm)
Machine maximum length 57.0 in (1,450 mm)
Machine width without squeegee 26.8 in (681.5 mm) 30.0 in (758 mm)
(*) Machine test have been performed under the following conditions:
with operator [165.3 lb (75 kg)] if ride-on
Battery maximum size
Brush and squeegee maximum size
Full solution tank
Optional equipment installed
Wheel weight checked
Each wheel print checked on cement
Result expressed as maximum value for both front and rear wheels
(**) Under normal working conditions, on a level asphalt surface.
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SERVICE MANUAL
ENGLISH
Razor Blade 26D / 28D / 28C 909 6510 000(3)2007-12
7
GENERAL INFORMATION
TECHNICAL DATA (Continues)
TECHNICAL DATA FOR MACHINES WITH BRUSH/PAD-HOLDER DECK
Description 26D 28D
Brush diameter 13.0 in (330 mm) 14.5 in (370 mm)
Deck right/left offset 3,4/1,8 in (87,8/46,8 mm) 4,6/3 in (117,4/76,7 mm)
Brush distance from the ground (when lifted) 3,7 in (95,5 mm)
Weight without batteries and with empty tanks 308 lb (140 kg)
Maximum weight with batteries and full tanks
With 4 6 V batteries: 849 lb (385 kg)
With 24 V battery box: 1,036 lb (470 kg)
Brush/pad-holder motor power 0.54 hp (400 W)
Brush/pad-holder rotation speed 190 rpm
Brush/pad-holder pressure with extra-pressure deactivated 66 lb (30 kg)
Brush/pad-holder pressure with extra-pressure activated 110 lb (50 kg)
TECHNICAL DATA FOR MACHINES WITH CYLINDRICAL BRUSH DECK
Description 28C
Cylindrical brush size (diameter x length) 5.7 x 27.1 in (145 x 690 mm)
Deck right/left offset 5,5/3,6 in (138,7/92,2 mm)
Brush distance from the ground (when lifted) 1,8 in (45,5 mm)
Weight without batteries and with empty tanks
308 lb (140 kg)
Maximum weight with batteries and full tanks
With 4 6 V batteries: 849 lb (385 kg)
With 24 V battery box: 1,036 lb (470 kg)
Cylindrical brush motor power 0.81 hp (600 W)
Cylindrical brush rotation speed 748 rpm
Cylindrical brush pressure 73.48 lb (33.4 kg)
ENGLISH
SERVICE MANUAL
8
909 6510 000(3)2007-12 Razor Blade 26D / 28D / 28C
GENERAL INFORMATION
DIMENSIONS RAZOR BLADE 26D
681.5 mm (26.8 in)
830 mm (32.6 in)1450 mm (57.0 in)
1250 mm (49.2 in)
DIMENSIONS RAZOR BLADE 28D
758 mm (30 in)
1450 mm (57.0 in)
1250 mm (49.2 in)
860 mm (33.9 in)
SERVICE MANUAL
ENGLISH
Razor Blade 26D / 28D / 28C 909 6510 000(3)2007-12
9
GENERAL INFORMATION
DIMENSIONS RAZOR BLADE 28C
758 mm (30 in)
1450 mm (57.0 in)
1250 mm (49.2 in)
860 mm (33.9 in)
ENGLISH
SERVICE MANUAL
10
909 6510 000(3)2007-12 Razor Blade 26D / 28D / 28C
MAINTENANCE
MAINTENANCE
SCHEDULED MAINTENANCE
The lifespan of the machine and its maximum operating safety are ensured by correct and regular maintenance.
WARNING!
See the GENERAL INFORMATION and SAFETY paragraphs.
The following table provides the scheduled maintenance. The intervals shown may vary according to particular working conditions,
which are to be dened by the person in charge of the maintenance.
For instructions on maintenance procedures, see the following paragraphs.
SCHEDULED MAINTENANCE TABLE
Procedure
Daily, after
machine use
Weekly
Every six
months
Yearly
Squeegee cleaning
Brush cleaning
Tank and vacuum grid with oat cleaning
Battery charging
Squeegee blade check and replacement
Side skirt check
Solution lter cleaning
WET battery uid level check
Screw and nut tightening check (1)
Check and adjustment of driving belts between motors and
cylindrical brushes
Squeegee cable sliding shoe lubrication
Electromagnetic parking brake efciency check
Brush/pad-holder motor carbon brush check or replacement
Vacuum system motor carbon brush check or replacement
Drive system motor carbon brush check or replacement
(1) And after the rst 8 working hours.
SERVICE MANUAL
ENGLISH
Razor Blade 26D / 28D / 28C 909 6510 000(3)2007-12
11
MAINTENANCE
Control panel
Emergency push-button
Horn
Brush/pad-holder deck and cylindrical brush deck lifting/
lowering switch
Brush/pad-holder extra-pressure switch. With the
cylindrical brush deck installed, this switch is disabled.
Squeegee lifting/lowering and vacuum system on/off switch
Battery charge indicator
7a. Charged battery warning light (green)
7b. Semi-discharged battery warning light (yellow)
7c. Discharged battery warning light (red)
Hour counter and solution level display:
When the machine is started, it displays for a few
seconds the number of working hours which have been
performed.
While using the machine, it displays the solution level
in the tank (measured in percentage terms, compared
with the full tank). When the level is below 20%, the
display starts blinking. The display could indicate
“000 %” even if the tank is not completely empty, thus
allowing to complete the cleaning cycle; in any case,
it is recommended to check the actual solution ow
supplied to the brushes.
Solution ow control switches
10a. Flow increase switch
10b. Flow decrease switch
Maximum speed adjuster (enabled only when the brushes
are operating)
Ignition key
Steering wheel tilting control lever
Steering wheel
Forward/reverse gear pedal
Brush/pad-holder deck
Cylindrical brush deck
Side skirts
Battery charger cable housing
Battery charger cable
Solution lter
Recovery water drain hose
Squeegee vacuum hose
Squeegee
Bumper wheels
Squeegee support wheels
Squeegee mounting handwheels
Squeegee balance adjusting handwheel
Front squeegee blade
Rear squeegee blade
Squeegee rear blade fastening hook
Solution tank
Recovery water tank
Recovery water tank cover
Flashing light (optional)
Solution tap
Seat
Battery charger
Electromagnetic parking brake
Front steering, driving and braking wheel
41a. Electromagnetic brake unlock handwheel (*)
41b. Electromagnetic brake unlock handwheel (**)
Serial number plate/technical data
Rear wheels
1.
2.
3.
4.
5.
6.
7.
8.
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11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
42.
43.
Side skirt height adjustment knobs
Recovery water tank cover (open)
Recovery water tank cover gasket
Recovery water vacuum duct
Vacuum grid with automatic shut-off oat
Float
Grid fasteners
Solution tank ller neck
Solution tank cover
Cover support rod
Recovery water tank
Solution tank
Tank assembly (open)
Batteries
Battery case
Battery connector
Battery caps
Battery connection diagrams
Brush/pad-holder deck
Brush/pad-holder motors
Brush/pad-holder deck or cylindrical brush deck connector
Solution hose
Deck mounting knob
Deck fastening cotter pins
Deck support
Brush
Pad-holder
Pad
Cylindrical brush deck connector
Connector protection cover
Brush/pad-holder deck side skirt
Cylindrical brush deck
Cylindrical brush motors
Cylindrical brush deck side skirt
Skirt upper mounting knob
Skirt lower mounting knob
Cylindrical brush
Cylindrical brush lids
Lid mounting knobs
Cylindrical brush debris container
Debris container handle
Electrical component cover
Cover mounting nuts
Battery charger
Battery type selector (“WET” or “GEL”)
Drive system electronic board protection fuse (F2) (60 A)
Low power circuit protection fuse (F3) (5 A)
Function electronic board protection fuse (F1) (100 A)
Warning LED
Electrical component panel
Red LED (upper)
Green LED
Red LED (lower)
(*) Machines up to January 2007
(**) Machines after January 2007
44.
45.
46.
47.
48.
49.
50.
51.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
69.
70.
71.
72.
73.
74.
75.
76.
77.
78.
79.
80.
81.
82.
83.
84.
85.
86.
87.
88.
89.
90.
91.
92.
93.
94.
95.
96.
97.
98.
99.
100.
101.
102.
103.
MACHINE NOMENCLATURE
Throughout this Manual you will nd numbers in brackets – for example: (2). These numbers refer to the components shown in the
nomenclature pages. Refer to these pages whenever it is required to identify a component mentioned in the text.
ENGLISH
SERVICE MANUAL
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909 6510 000(3)2007-12 Razor Blade 26D / 28D / 28C
MAINTENANCE
MACHINE NOMENCLATURE (Continues)
33
34
35
13
14
42
32
15
19
20
25
18
16
21
43
25
29
30
27
31
24
26
26
27
25
23
28
17
18
37
38
16
18 36
43
25
22
44
44
44
3
2
6
5
4
7
7c
7b
7a
8
10
10a
10b
11
12
1
40
39
41a
39
41b
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SERVICE MANUAL
ENGLISH
Razor Blade 26D / 28D / 28C 909 6510 000(3)2007-12
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MAINTENANCE
MACHINE NOMENCLATURE (Continues)
S301396
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SERVICE MANUAL
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909 6510 000(3)2007-12 Razor Blade 26D / 28D / 28C
MAINTENANCE
MACHINE NOMENCLATURE (Continues)
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SERVICE MANUAL
ENGLISH
Razor Blade 26D / 28D / 28C 909 6510 000(3)2007-12
15
DETERGENT SUPPLY SYSTEM
DETERGENT SUPPLY SYSTEM
SOLUTION TANK CLEANING
Drive the machine to the appointed disposal and washing area.
Turn the ignition key (12) to "0".
Empty the solution tank (59) with the tap (36).
Start the machine (as shown in the User Manual) and keep it running until the solution tank is completely empty.
Open the cover (56) and install the support rod (57).
Clean and wash with clean water the cover (56), the tank (59) and the ller (51).
Drain the water in the tank with the tap (36).
Start the machine (as shown in the User Manual) and keep it running until the solution tank is completely empty.
Remove the support rod (57) and close the cover (56).
Clean the solution lter (see the following procedure).
SOLUTION FILTER CLEANING
Drive the machine on a level oor.
Turn the ignition key (12) to "0".
Close the solution tap (A) under the machine, behind the right rear wheel. The tap (A) is closed when it is in the position (B)
and it is open when it is in the position (C).
Remove the transparent cover (D), then remove the lter strainer (E) under the machine, in front of the right rear wheel. Clean
and install them on the support (F).
NOTE
The lter strainer (E) must be correctly positioned on the housing (G) of the support (F).
Open the tap (A).
S301320
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6.
7.
8.
9.
10.
1.
2.
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4.
5.
ENGLISH
SERVICE MANUAL
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909 6510 000(3)2007-12 Razor Blade 26D / 28D / 28C
DETERGENT SUPPLY SYSTEM
SOLUTION SYSTEM SOLENOID VALVE/TAP/FILTER DISASSEMBLY/ASSEMBLY
Disassembly
Drive the machine to the appointed disposal area, and empty the recovery water tank (58) with the hose (22).
Empty the solution tank (59) with the tap (36).
Place the machine on a hoisting system (if available), then lift it. Otherwise, drive the machine on a level oor.
Turn the ignition key (12) to "0".
Place a suitable jack (A) under the machine right side bracket (B).
Lift the machine for 0.78 in (2 cm) with the jack.
Remove the screw (C) and recover the washer (D).
Remove the right wheel (E).
Remove the screws (F).
Move the support (G) forward, by disengaging the fastener (H) from the screw (I).
Disconnect the hoses (J) and (K) from their ttings (L).
Disconnect the hose (M) from the pressure switch (N) by pulling it.
Disconnect the connectors (O) of the solenoid valve (P) and of the pressure switch.
Recover the whole assembly (G) and, at the workbench, remove the solenoid valve (R), or the lter assembly (S), or the tap
(T), by disconnecting/unscrewing the connecting/fastening components.
Assembly
Assemble the components in the reverse order of disassembly, and note the following:
Before screwing the threaded ttings (U) clean them, then apply Teon tape, according to the screwing direction;
when assembling the solenoid valve (R), the stamped arrow must be tuned in the direction of the solution ow.
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Razor Blade 26D / 28D / 28C 909 6510 000(3)2007-12
17
DETERGENT SUPPLY SYSTEM
SOLUTION SYSTEM SOLENOID VALVE/TAP/FILTER DISASSEMBLY/ASSEMBLY (Continues)
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SERVICE MANUAL
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909 6510 000(3)2007-12 Razor Blade 26D / 28D / 28C
DETERGENT SUPPLY SYSTEM
TROUBLESHOOTING
SMALL AMOUNT OF SOLUTION OR NO SOLUTION REACHES THE BRUSH
Possible causes:
The solution lter is clogged/dirty (clean).
The solution tap is closed/semi-closed (replace).
The solenoid valve is broken or there is an open in the electrical connection (replace the solenoid valve/repair the electrical
connection).
There is debris in the solution tank clogging the output hole (clean the tank).
There are debris in the solution hoses clogging the ow (clean the hoses).
THE SOLUTION REACHES THE BRUSH ALSO WHEN THE MACHINE IS OFF
Possible causes:
There is dirt or calcium deposit on the solenoid valve gasket (clean).
The solenoid valve is broken (replace).
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SERVICE MANUAL
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Razor Blade 26D / 28D / 28C 909 6510 000(3)2007-12
19
BRUSHING SYSTEM
BRUSHING SYSTEM
BRUSH/CYLINDRICAL BRUSH CLEANING
CAUTION!
It is advisable to wear protective gloves when cleaning the brushes because there may be sharp debris.
Remove the brushes from the machine, as shown in the User Manual.
Clean and wash the brushes with water and detergent.
Check the brush bristles for integrity and wear; if necessary, replace the brushes.
SIDE SKIRT CHECK (AND REPLACEMENT)
Check
Drive the machine on a level oor.
Turn the ignition key (12) to "0".
On both sides of the machine, unscrew the knobs (A) and remove the side skirt assembly (B).
Wash and clean the side skirts.
Check that the side skirt lower edge (C):
lays down on the same level, along all its length;
is integral and free from cuts and lacerations;
has the inner corner (D) that is not worn;
Otherwise overturn or replace the skirts according to the following procedure.
Overturning or replacement
Remove the wing nuts (E), then remove the retaining strip (F).
Remove the skirt blade (G) and, if possible, overturn the blade to replace the lower inner corner (D) with an integral one. If the
other three corners are worn too, replace the blade.
Assembly and height adjustment
Assemble the blades (G) and skirt (B) in the reverse order of disassembly.
Start the machine (according to the procedure shown in the User Manual) and lower the deck (H), then check that the side
skirt blades (G):
slightly touch the oor;
the side blades (G) collect the solution;
otherwise stop the machine and adjust the skirt height with the knobs (A) and (I).
After adjusting, tighten the knobs (A) and (I).
S301325
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SERVICE MANUAL
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909 6510 000(3)2007-12 Razor Blade 26D / 28D / 28C
BRUSHING SYSTEM
BRUSH/PAD-HOLDER DECK OR CYLINDRICAL BRUSH DECK DISASSEMBLY/ASSEMBLY
NOTE
The machine can be equipped with either the brush/pad-holder deck (69) or the cylindrical brush deck (82), according to
the following procedure.
To assemble/disassemble the deck it is not necessary to remove the brushes/pad-holders.
Disassembly
Drive the machine on a level oor.
Lower the deck (69) or (82) by pressing the switch (4).
Turn the ignition key (12) to "0".
(For brush/pad-holder deck) Disconnect the connector (71). (For cylindrical brush deck) Disconnect the connectors (71) and
(79), then install the protection cover (80) on the connector (79).
Disconnect the solution hose (72).
Remove the two split pins (74) and the split pin for the left lever xing.
Unscrew the knob (73) and remove the brush/pad-holder deck (69), or the cylindrical brush deck (82).
Assembly
Assemble the components in the reverse order of disassembly.
BRUSH MOTOR ELECTRICAL INPUT CHECK
WARNING!
This procedure must be performed by qualied personnel only.
Drive the machine on a level oor.
Remove the brush (76) or (87), or the pad-holder (77) as shown in the User Manual.
Place two wooden shims (A) under the brush/pad-holder deck sides (B), or the cylindrical brush deck (C), as shown in the
gure. The wooden shim height must be 1.5 in (40 mm).
WARNING!
Keep the wooden shims (A) at a proper distance from the brush hubs (D).
Apply the amperometric pliers (E) on one cable (F) of the right motor (G), or on one cable (H) of the left motor (I).
Turn the ignition key (12) to "I".
Press the switch (4) to lower the deck (B) or (C) on the wooden shims (A). When lowering the deck, the brush motors (G) and
(I) start running, then check that the electrical input of the right (G) or left motor (I) is as follows:
3 to 5 A at 24 V, for the brush/pad-holder deck motors;
5 to 6 A, at 24 V, for the cylindrical brush deck motors.
Lift the deck (B) or (C) by pressing the switch (4). Turn the ignition key (12) to "0" and remove the amperometric pliers (E).
If the electrical input is higher, perform the following procedures to detect and correct the abnormal input:
Check if there is dust or dirt (ropes, cables, etc.) on the brush/pad-holder hubs.
Check the motor carbon brushes (see the procedure in the relevant paragraph).
If necessary, disassemble the motor (see the procedure in the relevant paragraph), and check the condition of all its
components.
If the above-mentioned procedures do not lead to a correct electrical input, the motor must be replaced (see the procedure in
the relevant paragraph).
Perform steps 2 and 3 in the reverse order.
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SERVICE MANUAL
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Razor Blade 26D / 28D / 28C 909 6510 000(3)2007-12
21
BRUSHING SYSTEM
BRUSH MOTOR ELECTRICAL INPUT CHECK (Continues)
S301326
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SERVICE MANUAL
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909 6510 000(3)2007-12 Razor Blade 26D / 28D / 28C
BRUSHING SYSTEM
DISC BRUSH MOTOR CARBON BRUSH CHECK AND REPLACEMENT
Remove the brush/pad-holder deck (see the procedure in the relevant paragraph).
(For cylindrical brush deck only) Remove the brush motor (see the procedure in the relevant paragraph).
Remove dust and dirt from the motor carbon brush support area (A).
Disengage the fasteners (B) and (C), then remove the four carbon brush supports (A). If necessary, disconnect the electrical
connections (D).
Check the carbon brushes (E) for wear. Replace the carbon brushes when: the contact with the motor armature is insufcient,
the carbon brushes are worn, the carbon brush contact surface is not integral, the thrust spring is broken, etc. The minimum
length of the carbon brushes (E) is 0.59 in (15 mm). When this length is reached, the carbon brushes must replaced.
If necessary, disconnect the connections (F) and remove the carbon brushes with their supports (A) and replace them.
Replace the carbon brushes as an assembly.
Assemble the components in the reverse order of disassembly, and note the following:
When connecting the terminals (F), take care of their insulation from the surrounding parts of the frame.
S301327
CYLINDRICAL BRUSH MOTOR CARBON BRUSH CHECK AND REPLACEMENT
Remove the brush motor (see the procedure in the relevant paragraph).
At the workbench, remove dust and debris from the motor, especially in the area of the protection clamp (A).
Remove the protection clamp (A).
For each carbon brush, move the protection (B) and remove the screws (C).
Remove the carbon brushes (D).
Check if the carbon brushes (D) are worn. Replace the carbon brushes when: the contact with the motor armature is
insufcient, the carbon brushes are worn, the carbon brush contact surface is not integral, the thrust spring is broken, etc.
Replace the carbon brushes as an assembly.
Assemble the components in the reverse order of disassembly.
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D
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Razor Blade 26D / 28D / 28C 909 6510 000(3)2007-12
23
BRUSHING SYSTEM
BRUSH/PAD-HOLDER MOTOR DISASSEMBLY/ASSEMBLY
Disassembly
Remove the brushes/pad-holders, as shown in the User Manual.
Remove the brush/pad-holder deck (see the procedure in the relevant paragraph).
At the workbench, disconnect the motor electrical connections (A).
Cut the motor clamp (B).
Remove the motor screw (C), then remove the relevant hub assembly (D). Recover the key (E).
Remove the four motor screws (F).
Remove the reduction unit (G).
Assembly
Assemble the components in the reverse order of disassembly, and note the following:
Place the reduction units (G) as shown in the gure.
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SERVICE MANUAL
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909 6510 000(3)2007-12 Razor Blade 26D / 28D / 28C
BRUSHING SYSTEM
CYLINDRICAL BRUSH MOTOR DISASSEMBLY/ASSEMBLY
Disassembly
Remove the deck (see the procedure in the relevant paragraph).
Unscrew the knobs (A) and remove the side skirt assembly (B) on the side of the machine where the motor must be removed.
Remove the screw (C), then remove the cover (D).
Loosen the nuts (E) and remove the cover (F).
Loosen the nut (I) and move the pulley (J) to loosen the belt (K).
Remove the belt (K) from the brush motor pulley (L).
Disconnect the brush motor electrical connections (M).
Remove the screws (G), then remove the motor (H).
Assembly
Assemble the components in the reverse order of disassembly, and note the following:
The electrical connections (M) of the motor must be turned upwards;
Install the belt (K) and tension it properly (see the procedure in the relevant paragraph).
S301329
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SERVICE MANUAL
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Razor Blade 26D / 28D / 28C 909 6510 000(3)2007-12
25
BRUSHING SYSTEM
CYLINDRICAL BRUSH MOTOR DISASSEMBLY/ASSEMBLY (Continues)
S301330
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