LGMG SR2669D User manual

Service Manual
SR2669D/SR3369D/SR4069D
Rough terrain Mobile
Elevating Work Platform
△
!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.
LINGONG HEAVY MACHINERY CO.，LTD.

Rough terrain Mobile Elevating Work Platform
Service Manual
880*1230 mm Sextodecimo 8 sheets
First edition, May 2022 First print, May 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.: 12F, Building 3, Lushang Olympic City, No. 9777, Jingshi Road, Lixia District, Jinan
City, Shandong Province, China
Tel: [phone] Technical service: 86-4009666569
Web: www.LGMG.com.cn Sales of accessories:86-0531-67605016

Service Manual of Rough Terrain Mobile Elevating Work Platform
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Contents
Contents......................................................................................................................I
Foreword.................................................................................................................VIII
Safety Notices ...........................................................................................................IX
1Safety and Environment .......................................................................................1
Terms and Definitions.....................................................................................3
Compliance.....................................................................................................3
Before maintenance .......................................................................................3
Workplace requirements................................................................................3
Safety precautions for maintenance and repair..............................................3
Intended use ..................................................................................................4
Description.....................................................................................................4
2Product Introduction............................................................................................7
Machine parameters ......................................................................................9
SR2669D (S266900WNK4AH2002) machine parameters ..........................9
SR3369D (S336900WNK4AH2000) machine parameters ........................10
SR4069D (S406900WNK4AH2000) machine parameters ........................12
Specification for selection of tightening torque of the lifting platform .........13
Key component moment table .....................................................................16
3Service................................................................................................................ 17
Platform .......................................................................................................19
Removing the working platform .............................................................20
Removing the extended platform ...........................................................20
Subassembling the extended platform ...................................................20
The main platform assembly...................................................................21
Folding the working platform guardrail................................................... 22
Platform control unit (PCU) ..........................................................................22
Removing the platform control unit........................................................22

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Assembling the platform control unit (PCU) ...........................................23
The platform gate.........................................................................................23
Removing the semi-swing gate ...............................................................23
Installing the semi-swing gate.................................................................23
Fork assembly...............................................................................................25
Removing forks(SR2669D) ...................................................................... 25
Removing forks(SR3369D) ...................................................................... 29
Removing forks(SR4069D) ...................................................................... 34
Assembly the Fork ..................................................................................38
Replacing the fork slider at platform.......................................................46
Replacing the fork slider at chassis .........................................................47
Engine assembly........................................................................................... 47
Installing engine mounts.........................................................................47
The pump cover and coupling................................................................. 47
Installing the solenoid valve....................................................................48
The gear pump .......................................................................................49
Assembling the engine intake system .....................................................50
Removing the engine intake system........................................................50
Assembling the engine cooling system ...................................................51
Removing the engine cooling system......................................................51
Fuel tank and hydraulic oil tank.................................................................... 51
Removing the fuel tank...........................................................................51
Installing the fuel tank ............................................................................52
Removing the hydraulic tank ..................................................................52
Installing the hydraulic oil tank ...............................................................53
Wheels .........................................................................................................53
Removing wheels.................................................................................... 53
Assembling wheels .................................................................................54

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Front axle assembly......................................................................................54
Installing the steering rod and steering cylinder .....................................54
Removing the steering linkage and steering cylinder..............................55
Installing the steering knuckle and front motor ......................................55
Removing the steering knuckle and front axle motor .............................56
Assembling the axle swing cylinder ........................................................ 57
Removing the axle swing cylinder...........................................................57
Rear axle assembly .......................................................................................57
Installing the reducer.............................................................................. 58
Installing the rear axle motor.................................................................. 58
Removing the rear axle assembly ...........................................................59
Outrigger assembly....................................................................................59
Assembling the outrigger cylinder .......................................................59
Removing the outrigger cylinder.......................................................... 60
Installing the level meter ..................................................................... 60
Other components ....................................................................................61
Installing the hydraulic oil radiator.......................................................61
Installing the DC power switch............................................................. 62
Installing the high pressure filter .........................................................62
Installing the battery............................................................................ 62
Valve group................................................................................................ 64
Installing the spool............................................................................... 64
Lift control valve ..................................................................................64
Walking control valve........................................................................... 65
Lower lift cylinder control valve...........................................................66
Lower cylinder valve block...................................................................67
Pressure sensor on lifting control valve................................................68
Schematic diagram of location of main appliances....................................69

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4Commissioning...................................................................................................71
Safety instructions........................................................................................73
Test of basic functions .................................................................................. 74
Start/stop test......................................................................................... 74
Lifting/lowering function test .................................................................74
Steering test ...........................................................................................74
Horn test.................................................................................................75
Drive and brake function test..................................................................75
No-load test.................................................................................................. 75
Outrigger leveling ...................................................................................75
Fork and platform................................................................................... 75
Relief pressure test.......................................................................................76
System....................................................................................................76
Lifting .....................................................................................................76
Steering ..................................................................................................76
Calibration test.............................................................................................76
Inclination calibration .............................................................................77
Outrigger leveling ...................................................................................77
Adjustment of level meter......................................................................77
Inclination test..............................................................................................77
Fore-and-aft 3°.......................................................................................77
Left-and-right 2°.....................................................................................78
Load calibration............................................................................................78
Idle load..................................................................................................79
Rated load .............................................................................................. 79
Overload function.........................................................................................80
Start........................................................................................................80
Parameter setting ...................................................................................80

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Test with 1.2 times rated load................................................................. 80
Overload recovery ..................................................................................81
Test with 1.25 times rated load...............................................................81
No-load lifting time ......................................................................................81
No-load lifting time test..........................................................................81
Adjustment of lifting speed.....................................................................82
Adjustment of lowering speed................................................................82
Emergency lowering test ...........................................................................82
Outrigger limit test(Idle load) ....................................................................83
Floating test...............................................................................................83
Function test..............................................................................................84
Anti-pinch function.............................................................................. 84
Beacon function...................................................................................84
Operation alarm function ....................................................................84
Outrigger function ...............................................................................85
Overload function................................................................................85
Fuel level inspection function ..............................................................85
Lifting height for overload alarm.......................................................... 86
Basic operation..........................................................................................86
5Maintenance ......................................................................................................89
Checking the safety manual.......................................................................... 91
Checking the labels and signs ....................................................................... 91
Checking for damaged, loose or missing parts.............................................. 91
Checking the GCU......................................................................................... 92
Checking the PCU ......................................................................................... 92
Checking the wires ....................................................................................... 92
Checking the battery .................................................................................... 93
Checking the tires and wheel hubs ...............................................................94

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Checking the hydraulic tank vent cap ...........................................................94
Checking for leakage of hydraulic oil.......................................................... 94
Checking the hydraulic filter ......................................................................95
Replacing the air filter of the hydraulic tank ..............................................96
Checking the hydraulic oil level..................................................................96
Checking or changing the hydraulic oil ......................................................96
Checking the oil level of the reducer ......................................................... 97
Changing the reducer gear oil....................................................................98
Checking the cooling system......................................................................98
Maintenance of Kubota engine.................................................................. 98
Checking the engine oil level ...............................................................98
Changing engine oil and replacing oil filter ..........................................99
Checking fuel leaks ............................................................................ 100
Cleaning or replacing the fuel filter....................................................100
Bleeding the fuel system.................................................................... 101
Cleaning or replacing the air cleaner ................................................. 101
Checking the coolant level................................................................. 102
Adding or changing engine coolant.................................................... 102
Checking the engine belt ...................................................................103
Engine DTCs............................................................................................. 104
Checking or replacing the scissor arm slider ............................................ 107
Scheduled maintenance ..........................................................................107
Routine Inspection and Maintenance Intervals........................................ 108
6Appendix.......................................................................................................... 113
Electrical schematic diagram ......................................................................115
SR69D Electrical schematic diagram .....................................................115
Hydraulic schematic diagram...................................................................... 116
SR2669D、SR3369D Hydraulic schematic diagram............................... 116

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SR4069D Hydraulic schematic diagram................................................. 117
Diagram of common hydraulic part symbols............................................... 118
Diagram of common electrical part symbols...............................................125
Machine fault codes ................................................................................... 129

Service Manual of Rough Terrain Mobile Elevating Work Platform
VIII
Foreword
You are welcome to purchase and use the products produced by LingongHeavy MachineryCo., Ltd. This
manual introduces the technical parameter and maintenance adjustment data of Rough terrain elevating
work platform, and explains the troubleshooting and maintenance process for 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 about the machine and questions about this manual, please contact our
company. At the same time, we encourage readers to feedback errors to Lingong Group Jinan Heavy
Machinery Co., Ltd. and put forward suggestions for improvement. All suggestions will be carefully
considered in the future publication and printing of this manual.
The copyright of this manual belongs to Lingong Heavy Machinery Co., Ltd., and it is not allowed to
be copied or reprinted without the written permission of our company.
△
!WARNING
Only specially trained and qualified personnel can operate, repair and maintain the
machine.
Incorrect operation, maintenance and repair are dangerous and can lead to personal
injury or death.
Before operating or maintaining the machine, the operator should read this manual
carefully. Do not operate, maintain or repair this platform without reading and
understanding this manual.
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 operating procedures and precautions provided in this manual are only applicable
to the specified purposes of this machine. If it is used for operations other than those
specified but not prohibited, make sure that this operation does not cause harm to you
or others.

Service Manual of Rough Terrain Mobile Elevating Work Platform
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Safety Notices
The operator should understand and follow the current national and local safety regulations. If
there are no national or local regulations, the safety instructions in this manual shall be applicable.
Most accidents are caused by failure to comply with the regulations on the operation and
maintenance of the machine. In order to avoid accidents, please read, understand and observe all
warning requirements and precautions in this manual and on the machine before operation and
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.
Since it is impossible to foresee all possible dangers, the safety instructions in this manual and on
the machine cannot include all safety precautions. If steps and operations not recommended in this
manual are used, you must ensure that you and other people are safe and the machine will not be
damaged. If you are not sure about the safety of some operations, please contact our company or
dealer.
Some operations to the machine require not only basic mechanical, hydraulic and electrical skills,
but also professional skills, tools, lifting equipment and suitable workshop. In these cases, we strongly
recommend that the maintenance and repair should be carried out at a service center authorized by
Lingong Heavy Machinery Co., Ltd.
The maintenance precautions given in this manual are only applicable when the machine is used
for the specified purpose. If the machine is used in the scope out of this manual, our company will not
assume any safety responsibility, and the safety responsibility in such operations shall be borne by the
user and the operator. Under no circumstances shall the operations prohibited in this manual be
performed.
Most of the maintenance process can only be performed by trained professional service personnel
in properly equipped workshops.
△
!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.

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Service Manual of Rough Terrain Mobile Elevating Work Platform
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1 Safety and Environment

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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: those with recognized academic qualifications, certificates, professional status, or
relevant professional knowledge, trained and experienced, who can effectively prove their
ability to solve the difficulties encountered in related matters, work or projects.
Safety notice: relevant safety information issued by Lingong Heavy Machinery Co., Ltd.
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.
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.
Workplace requirements
Unless specially specified, the machine shall be able to operate safely under the following conditions:
1. Altitude ≤ 1000m/3281ft;
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: ≤12.5m/s/28mph.
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.
Safety precautions for maintenance and repair
1. Before adjusting and repairing the machine, the following preventive measures shall be taken
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

Service Manual of Rough Terrain Mobile Elevating Work Platform
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accident;
If possible, lower the platform to the lowest position, 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.
2. Maintenance personnel training
Maintenance personnel must be trained by qualified personnel to inspect and maintain the
machine in accordance with the requirements of this manual.
3. Parts replacement
The replacement components and parts must be the original parts of our company, otherwise
the product will not be maintained or repaired.
4. Service announcement
Users shall maintain and repair the machine in strict accordance with the service announcement
issued by Lingong Heavy Machinery Co., Ltd.
Intended use
This machine is only intended for lifting people and their tools and materials to a high-altitude
workplace.
Description
Most maintenance processes can only be performed by professionally trained maintenance
personnel in a properly equipped workshop. After troubleshooting, select the appropriate maintenance
steps.
Perform the disassembly steps until the repair can be completed. Then perform the disassembly
steps in the reverse order.
It is strongly recommended to carry out maintenance and repair at the service center authorized by
Lingong Group Jinan Heavy Machinery Co., Ltd.
Symbol representation
Symbols, color codes and symbolic words used by LGMG products have the following meanings:
Safety warning sign - used for warning of potential personal injury. Observe all safety tips
after this sign to avoid possible personal injury or death.
Red - Indicating a hazardous situation. If it is not
avoided, it will lead to death or serious injury of
personnel.
Orange - Indicating a hazardous situation. If it is
not avoided, it may cause death or serious injury.
DANGER
WARNING

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Yellow - Indicating a dangerous situation. If not
avoided, it maycause minor or moderate personal
injury.
Blue - Indicating a dangerous situation. If not
avoided, it may result in property damage.
CAUTION
NOTE

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2 Product Introduction

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