Mitsubishi FB20NT User manual

Service Manual
99759-5B110
Chassis, Mast & Options
FB16NT EFB11-20011-up
FB18NT EFB13-20011-up
FB20NT EFB13-70001-up
MC/FC
For use with FB16NT-FB20NT
Controller Service Manual.

FOREWORD
This service manual is a guide for servicing Mitsubishi forklift trucks. For your convenience
the instructions are grouped by systems as a ready reference.
The long productive life of your forklift trucks depend on regular and proper servicing.
Servicing consistent with what you will learn by reading this service manual. Read the
respective sections of this manual carefully and familiarize yourself with all of the components
before attempting to start a test, repair or rebuild job.
The descriptions, illustrations and specifications contained in this manual are for trucks with
serial numbers in effect at the time of printing. Mitsubishi forklift trucks reserves the right to
change specifications or design without notice and without incurring obligation.
Safety Related Signs
The following safety related signs are used in this service
manual to emphasize important and critical instructions:
Indicates a potentially hazardous
situation which, if not avoided, could
result in death or serious injury.
Indicates a potentially hazardous
situation which, if not avoided, may
result in death or serious injury or
damage to the machine.
Indicates a condition that can cause
damage to, or shorten service life of,
the machine.
NOTE
WARNING
!
CAUTION
!
Pub. No. 99759-5B110

HOW TO READ THIS MANUAL
Disassembly diagram (example)
Sequence
1. Cover, Bolt, Washer (part name)
2. Output shaft (part name)
Suggestion for disassembly
(1) Output shaft removal
Unit: mm (in.)
A0.020 to 0.105
Clearance between (0.00079 to 0.00413)
cylinder and piston 0.15
B(0.0059)
A: Standard value B: Repair or service limit
Disassembly sequence
Each disassembly diagram is followed
by Disassembly sequence and
Suggestions for disassembly.

4. Lower the forks or other implements to the ground
before performing any work on the truck. If this
cannot be done, make sure the forks or other
implements are blocked correctly to prevent them
from dropping unexpectedly.
5. Use steps and grab handles (if applicable) when
mounting or dismounting a truck. Clean any mud
or debris from steps, walkways or work platforms
before using. Always face truck when using
steps, ladders and walkways. When it is not
possible to use the designed access system,
provide ladders, scaffolds, or work platforms to
perform safe repair operations.
6. To avoid back injury, use a hoist when lifting
components which weigh 23 kg (50 lb.) or more.
Make sure all chains, hooks, slings, etc., are in
good condition and are of the correct capacity. Be
sure hooks are positioned correctly. Lifting eyes
are not to be side loaded during a lifting
operation.
7. To avoid burns, be alert for hot parts on trucks
which have just been stopped and hot fluids in
lines, tubes and compartments.
8. Be careful when removing cover plates.
Gradually back off the last two bolts or nuts
located at opposite ends of the cover or device and
pry cover loose to relieve any spring or other
pressure, before removing the last two bolts or
nuts completely.
9. Be careful when removing filler caps, breathers
and plugs on the truck. Hold a rag over the cap or
plug to prevent being sprayed or splashed by
liquids under pressure. The danger is even greater
if the truck has just been stopped because fluids
can be hot.
The serviceman or mechanic may be unfamiliar with
many of the systems on this truck. This makes it
important to use caution when performing service
work. A knowledge of the system and/or components
is important before the removal or disassembly of any
component.
Because of the size of some of the truck components,
the serviceman or mechanic should check the weights
noted in this Manual. Use proper lifting procedures
when removing any components.
Following is a list of basic precautions that should
always be observed.
1. Read and understand all warning plates and decals
on the truck before operating, lubricating or
repairing the product.
2. Always wear protective glasses and protective
shoes when working around trucks. In particular,
wear protective glasses when pounding on any
part of the truck or its attachments with a hammer
or sledge. Use welders gloves, hood/goggles,
apron and other protective clothing appropriate to
the welding job being performed. Do not wear
loose-fitting or torn clothing. Remove all rings
from fingers when working on machinery.
3. Do not work on any truck that is supported only
by lift jacks or a hoist. Always use blocks or jack
stands to support the truck before performing any
disassembly.
SAFETY
The proper and safe lubrication and
maintenance for these forklift trucks,
recommended by Mitsubishi forklift truck, are
outlined in the OPERATION & MAINTENANCE
MANUAL.
Improper performance of lubrication or
maintenance procedures is dangerous and
could result in injury or death. Read and
understand the OPERATION & MAINTENANCE
MANUAL before performing any lubrication or
maintenance on these trucks.
Do not operate these trucks unless you have
read and understand the instructions in the
OPERATION & MAINTENANCE MANUAL.
Improper truck operation is dangerous and
could result in injury or death.
WARNING
!WARNING !
WARNING
!

10. Always use tools that are in good condition and
be sure you understand how to use them before
performing any service work.
11. Reinstall all fasteners with same part number.
Do not use a lesser quality fastener if
replacements are necessary. Do not mix metric
fasteners with standard nuts and bolts.
12. If possible, make all repairs with the truck
parked on a level, hard surface. Block truck so it
does not roll while working on or under truck.
13. Disconnect battery and discharge any capacitors
(electric trucks) before starting to work on truck.
Hang “Do not Operate” tag in the Operator’s
Compartment.
14. Repairs, which require welding, should be
performed only with the benefit of the
appropriate reference information and by
personnel adequately trained and knowledgeable
in welding procedures. Determine type of metal
being welded and select correct welding
procedure and electrodes, rods or wire to provide
a weld metal strength equivalent at least to that
of parent metal.
15. Do not damage wiring during removal
operations. Reinstall the wiring so it is not
damaged nor will it be damaged in operation by
contacting sharp corners, or by rubbing against
some object or hot surface. Do not connect
wiring to a line containing fluid.
16. Be sure all protective devices including guards
and shields are properly installed and functioning
correctly before starting a repair. If a guard or
shield must be removed to perform the repair
work, use extra caution.
17. Always support the mast and carriage to keep
carriage or attachments raised when maintenance
or repair work is performed, which requires the
mast in the raised position.
18. Loose or damaged fuel, lubricant and hydraulic
lines, tubes and hoses can cause fires. Do not
bend or strike high pressure lines or install ones
which have been bent or damaged. Inspect lines,
tubes and hoses carefully. Do not check for
leaks with your hands. Pin hole (very small)
leaks can result in a high velocity oil stream that
will be invisible close to the hose. This oil can
penetrate the skin and cause personal injury. Use
cardboard or paper to locate pin hole leaks.
19. Tighten connections to the correct torque. Make
sure that all heat shields, clamps and guards are
installed correctly to avoid excessive heat,
vibration or rubbing against other parts during
operation. Shields that protect against oil spray
onto hot exhaust components in event of a line,
tube or seal failure, must be installed correctly.
20. Relieve all pressure in air, oil or water systems
before any lines, fittings or related items are
disconnected or removed. Always make sure all
raised components are blocked correctly and be
alert for possible pressure when disconnecting
any device from a system that utilizes pressure.
21. Do not operate a truck if any rotating part is
damaged or contacts any other part during
operation. Any high speed rotating component
that has been damaged or altered should be
checked for balance before reusing.

GROUP INDEX
GROUP INDEX Items
1
2
3
4
5
6
7
8
9
10
11
GENERAL INFORMATION
VEHICLE ELECTRICAL
COMPONENTS
Serial number locations, Dimensions, Technical data
Console box, Key switch, Lamp specification chart
POWER TRAIN
TRANSFER UNITS
REAR AXLE
Procedure and suggestions for removal and installation
Procedures and suggestions for disassembly and reassembly
BRAKE SYSTEM
STEERING SYSTEM
Rear axle, Rear wheels
Caliper, Brake pedal, Master cylinder
Steering control valve
HYDRAULIC SYSTEM
MASTS AND FORKS
Tank, Pump, Control valve, Lift and tilt cylinders, Flow regulator valve,
Down safety valve
Simplex mast, Duplex mast, Triplex mast
SERVICE DATA
Inspection standards, Periodic replacement of parts, Lubrication
standards, Main component weight, Tightening torque for standard bolts
and nuts, Special tools
OPTIONS Rearview mirror kit, Backup buzzer kit, Working lamp kit, Tire kit

Vehicle Exterior ....................................................................................... 1 – 1
Models ....................................................................................................... 1 – 1
Serial Number Locations ...................................................................... 1 – 2
Chassis and Mast Model Identification ............................................ 1 – 3
Dimensions .............................................................................................. 1 – 4
Technical Data ......................................................................................... 1 – 5
1
GENERAL INFORMATION

Truck Model Serial Number
FB16NT EFB11-20011-up (48V)
FB18NT EFB13-20011-up (48V)
FB20NT EFB13-70001-up (48V)
1-1
GENERAL INFORMATION
211128
Vehicle Exterior
Models
This manual applies to FB16NT, FB18NT and FB20NT.
Joystick box
(FC models)
Control lever
(MC models)

1-2
GENERAL INFORMATION
Mast number Chassis number Nameplate
211268
Serial Number Locations

1-3
GENERAL INFORMATION
Chassis and Mast Model Identification
[Chassis]
FB 16 N T
Generation designator
Three wheel models
Maximum capacity
16: 1600 kg (3500 lb)
18: 1800 kg (4000 lb)
20: 2000 kg (4400 lb)
Maximum lifting height
[“30” stands for 3000 mm (118 in.)]
Order of the minor change
(“A” for the original, “B” for the first change, “C” for
the second change, and so on)
Applicable truck model designation
15: 1 ton class
20: 2 ton class
Kind of mast
G: simplex mast
H: duplex mast
J: triplex mast
Major change
(“1” for the original, “2” for the first change, and so
on up to “9”)
Battery type
[Mast]
4G 15 A 30

1-4
GENERAL INFORMATION
Dimensions
BE F
A
D
C
211269

1-5
GENERAL INFORMATION
Technical Data
Truck Models FB16NT FB18NT FB20NT
Class 1.6 ton 1.8 ton 2.0 ton
Load Capacity/Load Center N (kgf)/mm 15690 (1600)/500 17650 (1800)/500 19610 (2000)/500
[lbf/in.] [3500/20] [4000/20] [4400/20]
Truck size Length to Fork Face Amm (in.) 1893 (74.5) 1996 (78.6) 2032 (80.0)
W idth Bmm (in.) 1070 (42.1) 1070 (42.1) 1130 (44.5)
Height of Overhead C2048 (80.6) 2048 (80.6) 2048 (80.6)
Guard mm (in.)
Wheelbase Dmm (in.) 1307 (51.5) 1410 (55.5) 1410 (55.5)
Service Weight (including battery) kg (lb) 3090 (6812) 3290 (7253) 3520 (7760)
Tread Front/Rear E/F mm 913/170 913/170 935/170
(in.) (35.9/6.7) (35.9/6.7) (36.8/6.7)
Tires Number Front/Rear 2/2 2/2 2/2
Tires Size Front 18 × 7-8 18 × 7-8 200/50-10
Rear 15 × 4.5-8 15 × 4.5-8 140/55-9
Turning Radius mm (in.) 1517 (59.7) 1620 (63.8) 1645 (64.8)
Travel Speeds Unloaded/Loaded km/h (mph) 17/17 (10.6/10.6) 17/17 (10.6/10.6) 17/17 (10.6/10.6)
Gradeability Loaded 27 25 23
[5 min., at 1.6 km/h (1.0 mph)] %
Lift Speeds Unloaded/Loaded m (in.)/sec 0.60/0.50 (23.6/19.7) 0.60/0.44 (23.6/17.3) 0.60/0.40 (23.6/15.7)
Lowering Speed Unloaded/Loaded m (in.)/sec 0.50/0.52 (19.7/20.5) 0.50/0.52 (19.7/20.5) 0.50/0.52 (19.7/20.5)
Battery Voltage V 48 48 48
Battery Rated Capacity (5 hrs.) MAX Ah 600 720 720
Battery Compartment mm 521 × 1006 × 650 624 × 1006 × 650 624 × 1006 × 650
Length × Width × Height (in.) (20.5 × 39.6 × 25.6) (24.6 × 39.6 × 25.6) (24.6 × 39.6 × 25.6)
Tilt Angle (forwards-backwards) 6°-7° 6°-7° 6°-7°
Traction Motor, 60 min short duty kW 2 × 6.3 2 × 6.3 2 × 6.3
Hydraulic Motor kW 14 14 14
Traction Motor Control Method MOSFET MOSFET MOSFET
Hydraulic Motor Control Method MOSFET MOSFET MOSFET

Console Box ............................................................................................ 2 – 1
Functions of Central Vehicle Monitor System ............................................ 2 – 1
Electrical Components in Console Box ..................................................... 2 – 5
Disassembly and Reassembly .................................................................. 2 – 6
Direction Lever ........................................................................................ 2 – 7
Accelerator Control ............................................................................... 2 – 8
Key Switch ............................................................................................... 2 – 9
Lighting Switch ....................................................................................... 2 – 9
Fuses ......................................................................................................... 2 – 10
Lamp Specification Chart .................................................................... 2 – 10
Troubleshooting of Lighting and Horn Systems ............................ 2 – 11
Joystick Box ............................................................................................ 2 – 12
2
VEHICLE ELECTRICAL COMPONENTS

123 4 5 67
8
9
10
Operations
No. Monitor name When OFF When ON or flashing Remarks
1Service indicator Starts flashing 20 hours before set time. Remains ON when set time is reached.
Seat belt warning Seat belt is fastened. Seat belt is not
light fastened when
2operator sits on seat
(seat switch is turned
on).
2-1
VEHICLE ELECTRICAL COMPONENTS
Console Box
1 Central vehicle monitoring system
(CVMS)
2 Mode selector button
3 Steering tilt lever
4 Key switch
5 Lighting switch
6 Mode check button
103043
1
2
3
4
5
6
Functions of Central Vehicle Monitor System (CVMS)
211131
NOTE
For setting the clock and selection of KPH or MPH,
refer to “Selection of KPH or MPH” and “Setting the
clock”.

2-2
VEHICLE ELECTRICAL COMPONENTS
No. Monitor name When OFF When ON or flashing Remarks
Controller/motor Controller, drive motors and Overheating Overheating causes a
overheat indicator
pump motor in normal significant output loss. When
3
temperature component temperature returns
to normal l
evels, output power
returns.
Remaining Normal battery condition Flashing indicates
battery charge battery needs to be
warning light recharged soon.
4ON indicates battery
needs to be recharged
and lifting function
inoperable.
5 Brake fluid level indicator Normal fluid level Low fluid level
6Parking brake warning Parking brake disengaged Parking brake
light disengaged
7Malfunction lamp Normal Vehicle malfunction
8Speedometer KPH, MPH
Error indicator
9Battery discharge When no bars show, vehicle is drivable but lifting Indicates remaining battery
indicator function is inoperable. power.
Hour meter
10
12345
Advances every 0.1 hour
(Number advances every 6 minutes.)
Hour indication

2-3
VEHICLE ELECTRICAL COMPONENTS
Selection of KPH or MPH
1. Apply the parking brake.
2. Place the direction lever in NEUTRAL.
3. Turn the key switch to the I(ON) position.
4. Push and hold button 1 for one to two seconds.
NOTICE:Display will show KPH and a 24-hour clock
until it is changed. When MPH is selected, the
clock will change to a 12-hour clock.
Setting the clock
1. Apply the parking brake.
2. Place the direction lever in NEUTRAL.
3. Turn the key switch to the I(ON) position.
4. Push and hold button 1until the minutes’ display
flashes.
5. Release button 1.
6. Adjust the minutes with button 2.
7. Push button 1and release when the hours’ display
flashes.
8. Adjust the hour with button 2.
9. Push button 1to lock in the time.
103043

2-4
VEHICLE ELECTRICAL COMPONENTS
Indication Condition
Indicator flashes if seat switch is turned off during driving operation. Then,
indicator turns on when seat switch is turned on again. Indicator turns off when
direction lever and accelerator pedal are returned.
ON Right traction motor overheated
ON Left traction motor overheated
ON Pump motor overheated
ON Right traction inverter overheated
ON Left traction inverter overheated
ON Pump inverter overheated
ON Faulty setting of lift lever
ON Faulty setting of tilt lever
ON Faulty setting of attachment 1lever
ON Faulty setting of attachment 2lever
ON Faulty setting of attachment 3lever
Indicator flashes if seat switch is turned off during lifting operation.
Then, H1 to H5 turn on when seat switch is turned on again. Indicator turns off
when lifting operation is suspended.
(L)
5H
4H
3H
2H
1H
7E
6E
5E
2E
1E
0(E)
E
Error code display

2-5
VEHICLE ELECTRICAL COMPONENTS
Electrical Components in Console Box
2
1
Horn cable
Monitor cable
Direction lever switch cable
1 Key switch
2 Lighting switch
211132

2-6
VEHICLE ELECTRICAL COMPONENTS
Disassembly and Reassembly
Disassembly
1
2
3
4
5
6
7
211133
Sequence
1 Console box (front panel)
2 Central vehicle monitor panel
3 Direction lever
4 Steering tilt lever
5 Console box (rear panel)
6 Key switch
7 Light switch
Disassembly procedure
(1) Remove the front panel and monitor panel from the
console box.
(2) Disconnect the harness connectors from the horn and
direction lever.
(3) Remove the screw from the steering tilt lever, and
remove the lever from the rear panel of the console
box.
(4) Remove the rear panel.
Reassembly
Follow the disassembly procedure in reverse.
Tilt steering
lock lever
Screw
T-nut
211134

2-7
VEHICLE ELECTRICAL COMPONENTS
Direction Lever
Structure
1
2
3
4
4
211135
1 Lever
2 Harness
3 Connector
4 Screw