LGMG AR14J User manual

LINGONG HEAVY MACHINERY CO., LTD.
△
!WARNING
Before operation and maintenance, the
drivers and maintenance personnel are
required to read this manual thoroughly.
Otherwise, fatal accident may occur. This
manual shall be kept properly for future
reference by the personnel concerned.
Service Manual
AR14J/AR16J
Articulated Boom Mobile
Elevating Work Platform

Articulated Boom Mobile Elevating Work Platform
Service Manual
880*1230 mm sixteen format 8 printed sheet
The second edition was first printed in Mar. 2022
L I N G O N G H E AV Y M A C H I N E R Y C O . , LT D .
Add: F12,Building 3 LushangGuoao Plaza, 9777 Jingshi Road,Lixia District, Jinan,
Shandong, 250000,China
Tel: [phone] Technical service: 86-4009666569
Web: www.LGMG.com.cn Sales of accessories:86-0531-67605016

Service Manual of the Articulated Boom
Mobile Elevating Work Platform
I
Contents
Foreword ......................................................................................................VI
Safety Notices .............................................................................................VII
Chapter 1 Safety and Environment........................................................ 1
1.1 Terms and definitions ............................................................................ 3
1.2 Compliance........................................................................................... 3
1.3 Before maintenance.............................................................................. 3
1.4 Workplace requirements ....................................................................... 4
1.5 Safety considerations for maintenance and repair................................. 4
1.6 Intended use......................................................................................... 6
1.7 Instructions............................................................................................ 6
Chapter 2 Product Introduction...................................................................... 7
2.1 Parameters of machine......................................................................... 9
2.1.1 Parameters of AR14J (A0014JNDCH20) articulated lifting platform.....................9
2.1.2 Parameters of AR16J (A0016JNDCH20) articulated lifting platform...................13
2.2 Pressure parameters of filters and valves ........................................... 15
2.3 Tightening torque of joints and plugs................................................... 16
2.4 Tightening torque of nuts and bolts ..................................................... 18
Chapter 3 Maintenance ............................................................................... 21
3.1 Platform assembly............................................................................... 23
3.1.1 Assembling the file box.......................................................................................23
3.1.2 Assembling the foot switch .................................................................................23
3.1.3 Assembling the lifting cross bar ..........................................................................23
3.1.4 Assembling the platform support ........................................................................24
3.1.5 Assembling the load cell.....................................................................................24
3.1.6 Assembling the swing motor mounting bracket...................................................25
3.1.7 Assembling the platform control unit (PCU)........................................................25
3.1.8 Assembling the anti-collision rubber pad ............................................................25
3.1.9 Assembling the platform .....................................................................................26
3.2 Axle assembly..................................................................................... 26
3.2.1 Disassembling the front axle assembly...............................................................26
3.2.2 Assembling the front axle assembly....................................................................27
3.2.3 Disassembling the rear axle assembly ...............................................................30
3.2.4 Assembling the rear axle assembly ....................................................................31
3.2.5 Disassembling the wheel....................................................................................33
3.2.6 Assembling the wheel.........................................................................................33

Service Manual of the Articulated Boom
Mobile Elevating Work Platform
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3.3 Jib assembly....................................................................................... 33
3.3.1 Disassembling the swing cylinder, the fly jib cylinder and the jib........................33
3.3.2 Assembling the swing cylinder, the fly jib cylinder and the jib.............................35
3.4 Engine assembly................................................................................. 38
3.4.1 Subassembling the engine .................................................................................38
3.4.2 Assembling the engine cooling system...............................................................41
3.4.3 Assembling the engine fuel pipeline ...................................................................42
3.5 Cable carrier assembly ....................................................................... 44
3.5.1 Disassembling the cable carrier..........................................................................44
3.5.2 Assembling the cable carrier...............................................................................46
3.6 Boom/extension jib assembly.............................................................. 48
3.6.1 Disassembling the boom ....................................................................................48
3.6.2 Assembling the boom assembly .........................................................................49
3.6.3 Disassembling the extension jib assembly .........................................................51
3.6.4 Assembling the extension jib assembly ..............................................................52
3.6.5 Assembling the telescopic boom assembly ........................................................54
3.7 Hydraulic tank/fuel tank....................................................................... 55
3.7.1 Assembling the hydraulic tank ............................................................................55
3.7.2 Disassembling the hydraulic tank.......................................................................57
3.7.3 Assembling the fuel tank.....................................................................................58
3.7.4 Disassembling the fuel tank................................................................................58
3.8 Cylinder assembly............................................................................... 59
3.8.1 Disassembling the boom luffing cylinder.............................................................59
3.8.2 Assembling the boom luffing cylinder..................................................................60
3.8.3 Disassembling the boom telescopic cylinder......................................................61
3.8.4 Disassembling the lower leveling cylinder ..........................................................63
3.8.5 Assembling the lower leveling cylinder ...............................................................64
3.8.6 Disassembling the upper leveling cylinder..........................................................64
3.9 Bleeding cylinder................................................................................. 66
3.9.1 Bleeding function pump......................................................................................66
3.9.2 Bleeding slewing motor.......................................................................................66
3.9.3 Bleeding walking motor.......................................................................................66
3.9.4 Bleeding steering cylinder...................................................................................66
3.9.5 Bleeding folding jib luffing cylinder......................................................................67
3.9.6 Bleeding main boom luffing cylinder and lower leveling cylinder ........................67
3.9.7 Bleeding main boom telescopic cylinder.............................................................68
3.9.8 Bleeding fly jib luffing cylinder and upper leveling cylinder.................................68
3.9.9 Bleeding platform swing cylinder ........................................................................68

Service Manual of the Articulated Boom
Mobile Elevating Work Platform
III
3.10 Folding jib assembly.......................................................................... 70
3.10.1 Removing folding jib .........................................................................................71
3.10.2 Assembling folding jib assembly.......................................................................75
3.10.3 Removing folding jib lift cylinder .......................................................................77
3.10.4 Assembling folding jib lift cylinder .....................................................................78
3.11 Rotary table swing assembly............................................................. 79
3.11.1 Removing slewing drive assembly....................................................................79
3.11.2Assembling slewing drive assembly..................................................................80
3.11.3 Lifting rotary table .............................................................................................80
3.12 Other components............................................................................. 80
3.12.1 Assembling battery ...........................................................................................80
3.12.2 Assembling tilt sensor.......................................................................................81
3.12.3 Assembling horn...............................................................................................81
3.12.4 Assembling slewing ring grease filler hose .......................................................82
3.12.5 Assembling ground control system...................................................................82
3.12.6 Assembling hydraulic oil radiator ......................................................................83
3.13 Valve group....................................................................................... 84
3.13.1 Multi-way valve assemblyAR16JEDC-5...........................................................84
3.13.2 Platform swing control valve ST4277-AB00......................................................85
3.13.3 ST5093-AB0C walking control valve group ......................................................86
Chapter 4 Maintenance ............................................................................... 89
4.1 Observing the regulations ................................................................... 91
4.2 Checking the battery........................................................................... 91
4.3 Checking the hydraulic filter................................................................ 92
4.4 Replacing the air filter of the hydraulic tank......................................... 94
4.5 Checking the hydraulic oil level........................................................... 94
4.6 Checking the oil level of the reducer ................................................... 94
4.7 Changing the reducer gear oil............................................................. 95
4.8 Maintenance of worm-type slewing drive............................................. 96
4.9 Maintenance of Deutz engine.............................................................. 97
4.9.1 Checking the engine oil level..............................................................................97
4.9.2 Changing engine oil and replacing oil filter.........................................................98
4.9.3 Checking fuel leaks...........................................................................................100
4.9.4 Bleeding or replacing the fuel filter ...................................................................100
4.9.5 Checking the air cleaner of the engine .............................................................102
4.9.6 Cleaning or replacing the air cleaner................................................................102
4.9.7 Checking the coolant level................................................................................103
4.9.8 Adding or changing engine coolant...................................................................103

Service Manual of the Articulated Boom
Mobile Elevating Work Platform
IV
4.9.9 Checking the engine belt..................................................................................104
4.10 Scheduled maintenance.................................................................. 105
4.11 Fault diagnosis of engine................................................................. 106
4.12 Maintenance schedule .....................................................................111
Chapter 5 Commissioning...........................................................................117
5.1 Safety instructions..............................................................................119
5.2 Commissioning process.................................................................... 120
5.3 Machine inspection ........................................................................... 121
5.4 Basic test .......................................................................................... 122
5.4.1 Start test...........................................................................................................122
5.4.2 Basic operation test of ground control unit........................................................124
5.4.3 Basic operation test of platform control system ................................................126
5.4.4 Hydraulic oil level test.......................................................................................129
5.4.5 Load test (1.1 times rated load)........................................................................130
5.4.6 Travel speed (high speed) test .........................................................................130
5.4.7 Braking distance test ........................................................................................131
5.4.8 Drive speed limit test ........................................................................................131
5.4.9 Braking distance test (at slow speed)...............................................................132
5.4.10 Drive enable system test ................................................................................132
5.4.11 Tilt sensor test.................................................................................................133
5.4.12 Gradeability test (45%)...................................................................................133
5.4.13 Gradeability test (25%)...................................................................................134
5.4.14 Floating test....................................................................................................134
5.4.15 Operation time test .........................................................................................134
5.4.16 Lifting height test ............................................................................................137
5.4.17 Load test (1.25 times).....................................................................................137
5.4.18 Rated load calibration.....................................................................................138
5.5 Pressure test..................................................................................... 138
5.5.1 Function valve relief pressure test....................................................................138
Chapter 6 Appendix................................................................................... 141
6.1 DTCs of COBO system..................................................................... 143
6.2 Schematic diagram ........................................................................... 144
6.2.1 AR14J/AR16J hydraulic schematic diagram (Rexroth).....................................144
6.2.2 AR14J/AR16J hydraulic schematic diagram (Sant main valve) ........................145
6.2.3 AR14J/AR16J electrical schematic diagram (Rexroth) .....................................146
6.2.4 AR14J/AR16J electrical schematic diagram (Sant main valve) ........................147
6.3 Diagram of common hydraulic part symbols...................................... 148
6.4 Diagram of common electrical part symbols...................................... 164

Service Manual of the Articulated Boom
Mobile Elevating Work Platform
V
Chapter 7 Kubota EU5 Engine Content..................................................... 176
7.1 Parameters of machine..................................................................... 178
7.1.1Parameters of AR14J（A0014JNKCH21）articulated lifting platform ...............178
7.1.2 Parameters of AR16J(A0016JNKCH21) articulated lifting platform ..................180
7.2 Kubota EUⅤEngine assembly ........................................................ 183
7.2.1 Subassembling the engine ...............................................................................183
7.2.2 Assembling the engine cooling system.............................................................184
7.2.3 Assembling the engine fuel pipeline .................................................................185
7.3 Kubota EUⅤengine maintenance..................................................... 187
7.3.1 Compliance and Obedience .............................................................................187
7.3.2 Check for Batteries...........................................................................................187
7.3.3 Maintenance of worm-Type Slewing Drive........................................................187
7.3.4 Check Hydraulic Oil Level.................................................................................188
7.3.5 Check for the Oil Level in the Reducer.............................................................189
7.3.6 Replacement of the Gear Oil of Reducer..........................................................189
7.3.7 Replacement of Engine Oil and Filter...............................................................190
7.3.8 Check for Fuel Leakage....................................................................................191
7.3.9 Draining of water separator ..............................................................................191
7.3.10 Replacement of the Fuel filter.........................................................................192
7.3.11 Changing of oil separator element..................................................................193
7.3.12 Cleaning or Replacement of Air Filter.............................................................193
7.3.13 Check for Coolant Liquid Level.......................................................................194
7.3.14 Filling or Replacement of Engine Coolant.......................................................194
7.3.15 Check for Engine Belt.....................................................................................195
7.3.16 Regular Maintenance......................................................................................195
7.3.17 Kubota EUⅤEngine fault table.....................................................................196
7.3.18 Engine fault codes..........................................................................................198
7.4 Kubota EUⅤSchematic Diagram .................................................... 205

Service Manual of the Articulated Boom
Mobile Elevating Work Platform
VI
Foreword
Thanks for purchasing the product produced by Lingong Heavy Machinery Co., Ltd. This manual
introduces the technical parameters and maintenance & adjustment data of the Articulated Boom
Mobile Elevating Work Platform, and also the troubleshooting and maintenance process for reference
by qualified professional maintenance personnel.
The information contained in this manual are correct at the time of publication, but due to the
continuous improvement of the structure and performance of our products, the design as well as
operation and maintenance instructions of the product may be subject to change without notice. For
the latest information of the machine or any question about this manual, please consult us. In
additions, readers of this manual are encouraged to feedback the errors and put forward suggestions
to Lingong Heavy Machinery Co., Ltd., which will be carefully considered in the future publication and
printing of this manual.
This manual is the property of Lingong Heavy Machinery Co., Ltd., and is not allowed to be
duplicated or reprinted without our written permission.
△!WARNING
Only the personnel who have professionally trained and qualified are
allowed to operate and maintain the machine.
Incorrect operation, maintenance and repair are dangerous and may lead to
personal injury or death.
Before operation or maintenance, please read this manual thoroughly.
Otherwise, do not operate, maintain or repair this machine.
Please load the machine in strict accordance with the rating, otherwise all
the consequences arising from overloading or unauthorized modification
will be borne by the user.
The operation instructions and precautions in this manual apply only to the
intended use of the machine. If the machine is used for an operation that is
out of the specification herein but not prohibited, always make sure that
this operation will not cause personal injury to yourself or others.

Service Manual of the Articulated Boom
Mobile Elevating Work Platform
VII
Safety Notices
The operator shall understand and abide by the current national and local safety regulations. If such
regulations are not available, the safety instructions in this manual shall prevail.
Most accidents are caused by failure to obey operation and maintenance specifications of the
machine. To avoid unnecessary accident, please read and follow all warnings and precautions in this
manual and on the machine before operation or maintenance. Failure to comply with the instructions
and safety rules in this manual and the corresponding manual on the machine will result in death or
serious injury.
Considering the fact that not all possible hazards are foreseeable, it is impossible for safety notices
in this manual and on the machine to cover all safety precautions. If it is necessary to take steps and
operations not recommended herein, always protect the safety of yourself and others, and keep the
machine from any damage. If the safety of some operations remains uncertain, please consult us or
dealers.
Some operations to the machine require not only basic mechanical, hydraulic and electrical skills,
but also professional skills, tools, lifting equipment and suitable workshop. Considering this, it is
strongly recommended for you to get the machine maintained and repaired in the service center
authorized by Lingong Heavy Machinery Co., Ltd.
The operation and maintenance precautions referred to herein apply only to the intended use of this
machine. If the machine is to be used for other purposes than those listed herein, it is the user or
operator instead of us that shall take the safety liabilities therefrom.
In no case shall any operations expressively prohibited herein be performed.
For the purpose of this manual, the following signal words are applied to identify safety instructions:
△!DANGER - Indicating any existing dangers that, if not avoided, will cause
serious injury or even death, and also serious machine damage.
△!WARNING - Indicating any potential dangers that, if not avoided, may cause
death or serious injury, and also serious machine damage.
△!CAUTION - Indicating situations that, if not avoided, may cause minor or
moderate injury, and also machine damage or shortened machine service life.

Service Manual of the Articulated Boom
Mobile Elevating Work Platform
I

Service Manual of the Articulated Boom
Mobile Elevating Work Platform
1
Chapter 1 Safety and Environment

Service Manual of the Articulated Boom
Mobile Elevating Work Platform
2

Service Manual of the Articulated Boom
Mobile Elevating Work Platform
3
1.1 Terms and definitions
Administrator: the entity or individual that directly controls the use and application of the lifting
platform, which usually refers to the owner, the renter or the authorized personnel of owner who
obtains the control right of the lifting platform;
Operator: personnel who has been professionally trained and mastered qualified knowledge and
practical experience to operate the lifting platform.
Qualified personnel: personnel who has recognized academic qualifications, certificates,
professional status or relevant professional knowledge, has been professionally trained and
experienced,
and has evidences to prove that he/she has the ability to solve difficulties encountered in related
matters, work or projects.
Safety Bulletin: relevant safety information issued by Lingong Heavy Machinery Co., Ltd.
1.2 Compliance
1. The maintenance is required to be carried out by personnel who have received and qualified in
the maintenance training of this machine.
2. Immediately mark the machine if it is damaged or faulty, and withdraw it out of service.
3. Repair any damage or fault before operating the machine.
1.3 Before maintenance
1. Read and follow the safety rules and maintenance instructions in the corresponding operation
manuals on the machine.
2. Ensure that all necessary tools and parts are in place.
3. Do not use parts not sold by Lingong Heavy Machinery Co., Ltd.
4. Please read each step thoroughly and follow the instructions, and do not try to perform repair by
shortcut, as this is dangerous.
5. Please wear goggles and other PPEs when necessary.
6. When lifting or placing loads, pay attention to the potential pinch risk by parts which are moving,
freely swinging or unstable.Always wear acceptable steel protective shoes.

Service Manual of the Articulated Boom
Mobile Elevating Work Platform
4
1.4 Workplace requirements
Unless specially specified, the machine shall be able to operate safelyunder the following conditions:
1. Altitude ≤ 1000m;
2. Ambient humidity ≤ 90% (at +25℃).
3. The machine shall be able to operate normally under the following safe conditions:
- Ambient temperature of -20℃~ +40℃;
- Wind speed ≤ 12.5 m/s.
4. During normal operation or maintenance, please set up protective devices as the movement of
mechanism and parts may cause danger to human body.
5. Take measures to prevent the danger caused by parts falling from the platform.
6. During maintenance, please place a satisfactory fire extinguisher in a readily available
position.
7. Keep the workplace tidy and clean, so as to avoid dirt entering machine parts and causing
damage thereafter.
8. Make sure that the forklift, crane or other lifting or supporting equipment has a sufficient lifting
capacity to support and secure the weight to be lifted.
9. Do not reuse disposable fasteners (such as cotter pins and lock nuts) during maintenance, as
they may not function normally when being reused.
10. Please dispose of the waste oil in an environment-friendly way.
11. Please ensure that the workplace is well ventilated and illuminated.
1.5 Safety considerations for maintenance and repair
1. Before adjusting and repairing the machine, please take the following preventive measures:
Park the machine on a solid and level ground
Block the wheels
Cut off the power supply to disable the machine;
Set all controls in “OFF” position to prevent the operating system from being started by accident;
If possible, lower the platform as much as possible; otherwise, ensure that it will not fall;
Before loosening or removing hydraulic components, release the hydraulic oil pressure in the
hydraulic pipeline;
Place safety supports as required.

Service Manual of the Articulated Boom
Mobile Elevating Work Platform
5
2. Training of maintenance personnel:
Maintenance personnel are required to be trained by qualified personnel, and then check and maintain
the machine according to the requirements of this machine.
3. Replacement of parts
The genuine parts of our company must be used for replacement; otherwise, we have the right to refuse
to provide maintenance and repair service for the machine concerned.
4. Service Bulletin
Users should maintain and repair the machine in strict accordance with the Service Bulletin issued by
Lingong Heavy Machinery Co., Ltd.
5. Weld repair of machine
1) Shut down the engine and switch off the low-voltage power supply before repair;
2) Ensure that the maintenance personnel has the special operation certificate;
3) Clean up the flammable materials around the welding position, and apply for a welding permit;
4) Protect the vehicle body against splashing and fire;
5) Operate in strict accordance with the welding process;
6. Precautions for battery maintenance
1) Do not store the battery which is fully discharged, and charge the battery in time after use.
2) In the process of use, correctly control the charging time according to the actual situation, and
determine the charging frequency according to the actual use frequency.
3) Prevent exposure to the sun, as a high temperature will increase the internal pressure of the
battery and cause electrolyte loss in the battery, leading to decrease of battery activity and faster aging
of polar plate. Therefore, be sure to stop the vehicle in a cool place.
4) In the process of use, check the battery for faults on a regular basis. If any problem is found, drive
the vehicle to the sales center or dealer for inspection and repair, so as to prolong the service life of the
battery pack and save maintenance costs to the greatest extent.
7. Coolant
When the radiator is hot, do not open the radiator cover for fear of scalding by the boiling coolant.
Therefore, be sure to open the radiator cover after the coolant temperature drops to an acceptable
level.

Service Manual of the Articulated Boom
Mobile Elevating Work Platform
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1.6 Intended use
This machine is only intended for lifting people and their tools and materials to a high-altitude
workplace.
1.7 Instructions
Most maintenance processes can only be performed by professionally trained maintenance
personnel in a properly equipped workshop. After troubleshooting, select the appropriate
maintenance procedure.
Perform removal to such an extent that the fault can be eliminated by repair. Then perform refitting
in the order reverse to removal.
It is strongly recommended to get the machine maintained and repaired in the service center
authorized by Lingong Heavy Machinery Co., Ltd.

Service Manual of the Articulated Boom
Mobile Elevating Work Platform
7
Chapter 2 Product Introduction

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Mobile Elevating Work Platform
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Service Manual of the Articulated Boom
Mobile Elevating Work Platform
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2.1 Parameters of machine
S/N
1
2
Name
AR14J articulated lifting platform
AR16J articulated lifting platform
Order No.
A0014JNDCH20
A0016JNDCH20
Configurations
1. Deutz (Euro V) engine
1. Deutz (Euro V) engine
2. Danfoss walking pump and motor
2. Danfoss walking pump and motor
3. Turbo-worm slewing drive
3. Turbo-worm slewing drive
4. 315/55 D20 filled off-road tire
4. 315/55 D20 filled off-road tire
5. COBO electronic control system
5. COBO electronic control system
2.1.1 Parameters of AR14J (A0014JNDCH20) articulated lifting platform
1) Parameters of machine
Item
Parameter
Item
Parameter
Rated load (kg)
230
Rotary table rotation time percircle
(stowed) (s)
82-92
Rotary table rotation time percircle
(extended) (s)
82-92
Total weight (kg)
7160
Boom lifting time (s)
35-45
Max. allowed workers
2
Boom lowering time (s)
30-40
Max. working height (m)
16.09
Articulating boom lifting time (s)
25-35
Max. platform height (m)
14.09
Articulating boom lowering time (s)
26-40
Max. horizontal reach (m)
7.67
Boom extension time (s)
20-30
Max. span height (m)
7.56
Boom retraction time (s)
20-30
Min. turning radius (inner wheel)
(m)
1.94
Jib lifting time (s)
30-50
Min. turning radius (outer wheel)
(m)
4.41
Jib lowering time (s)
20-35
Max. braking distance (no-load,
stowed) (m)
1≤S≤1.5
Platform rotation time (s)
13-26
Max. travel speed (stowed) (km/h)
6.1±0.5
Theoretical maximum gradeability
(no-load, stowed)
45%
Max. travel speed (extended)
(km/h)
0.8±0.05
Max. operation effort (N)
400
Climbing speed (stowed) (km/h)
＞1.5
Max. allowed wind speed (m/s)
12.5
Climbing speed (extended) (km/h)
≤0.8
Drive mode
Four-wheel

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Mobile Elevating Work Platform
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Max. allowed
inclination of
chassis
Along the boom
4.5°
drive
Front wheel
steering
Orthogonal to
boom
4.5°
2) Main dimensions
Item
Parameter
Item
Parameter
Overall length (mm)
6766
Track width (mm)
1981.5
Overall width (mm)
2310
Wheelbase (front/rear) (mm)
2059
Overall height (mm)
2170
Min. ground clearance (mm)
360
Dimension of working platform
(length ×width) (mm)
1830×760
Tire specification
315/55D20
3) Engine system
Item
Parameter
Item
Parameter
Model
Deutz D2.9L4
Number of cylinders
4
Type
In-line, water-cooled,
four-stroke
Bore/stroke (mm)
92/110
Rated power (kW)
36.4
Rated fuel consumption
(g/kW.h)
233
Rated speed (r/min)
2600
Max. torque (N.M)/speed
(r/min)
150/1600
Displacement (ml)
2900
Emission standard
EU StageⅤ
4) Hydraulic system
Item
Parameter
Walking system
Type
Closed
Pump displacement
(ml/r)
46
Max. working pressure
(MPa)
28
Motor displacement
(ml/r)
38
Functional
system
Type
Open
Pump displacement (ml/r)
18
Lifting
system
Max. working pressure
(MPa)
22.5