LGMG SR3369E User manual

Service Manual
SR3369E/SR4069E
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, June 2022 First print, June 2022
LINGONG HEAVY MACHINERY CO., LTD.
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
I
Contents
Contents...................................................................................................................................................................... I
Foreword.................................................................................................................................................................... V
Safety Notices............................................................................................................................................................ VI
ChapterⅠSafety and EnviroN•ment........................................................................................................................... 1
1.1 Terms and Definitions...............................................................................................................................................3
1.2 Compliance ...............................................................................................................................................................3
1.3 Before maintenance .................................................................................................................................................3
1.4 Workplace requirements ..........................................................................................................................................3
1.5 Safety precautions for maintenance and repair .......................................................................................................3
1.6 Intended use.............................................................................................................................................................4
1.7 Description................................................................................................................................................................ 4
ChapterⅡProduct Introduction.................................................................................................................................. 7
2.1 Machine parameters................................................................................................................................................. 9
2.1.1 SR3369E （ S33690DTAE30 ） Machine parameters ........................................................................................... 9
2.1.2 SR4069E （ S40690DTAE30 ） Machine parameters ......................................................................................... 10
2.2 Specification for selection of tightening torque of the lifting platform..................................................................11
2.3 Key component moment table........................................................................................................................... 13
ChapterⅢService.....................................................................................................................................................15
3.1 Platform..................................................................................................................................................................17
3.1.1 Removing the working platform...................................................................................................................... 18
3.1.2 Removing the extension platform.................................................................................................................... 18
3.1.3 Subassembling the extension platform............................................................................................................ 18
3.1.4 Main platform assembly.................................................................................................................................. 19
3.1.5 Folding the working platform guardrail....................................................................................................... 19
3.2 Platform control unit (PCU) ....................................................................................................................................20
3.2.1 Removing the platform control unit ................................................................................................................ 20
3.2.2 Assembling the platform control unit (PCU).................................................................................................... 21
3.3 The platform gate ...................................................................................................................................................21
3.3.1 Removing the semi-swing gate........................................................................................................................ 21
3.3.2 Installing the semi-swing gate......................................................................................................................... 21
3.4 Removing and installing the fork ............................................................................................................................22
3.4.1 Removing the fork (SR3369E) .......................................................................................................................... 22
3.4.2 Removing the fork (SR4069E) .......................................................................................................................... 27
3.4.3 Assembling the fork ......................................................................................................................................... 31
3.4.4 Replacing the fork slider at platform ........................................................................................................... 38
3.4.5 Replacing the fork slider at chassis.................................................................................................................. 38
3.5 Removing and installing wheels.............................................................................................................................. 39
3.5.1 Removing wheels............................................................................................................................................. 39

Service Manual of Rough terrain
Mobile Elevating Work Platform
II
3.5.2 Assembling wheels .......................................................................................................................................... 39
3.6 Front axle assembly............................................................................................................................................ 39
3.6.1 Installing the steering rod and steering cylinder ............................................................................................. 39
3.6.2 Removing the steering linkage and steering cylinder ...................................................................................... 40
3.6.3 Assembling the steering knuckle ..................................................................................................................... 40
3.6.4 Removing the steering knuckle........................................................................................................................ 40
3.6.5 Assembling the axle swing cylinder ................................................................................................................. 41
3.6.6 Removing the axle swing cylinder.................................................................................................................... 42
3.7 Rear axle assembly ................................................................................................................................................. 42
3.7.1 Assembling the reducer ................................................................................................................................... 42
3.7.2 Assembling the rear axle driving motor........................................................................................................... 42
3.7.3 Removing the rear axle assembly .................................................................................................................... 43
3.8 Outrigger assembly................................................................................................................................................. 43
3.8.1 Assembling the outrigger cylinder................................................................................................................... 43
3.8.2 Removing the outrigger cylinder ..................................................................................................................... 44
3.8.3 Assembling the level meter.............................................................................................................................. 44
3.8.4Assembling the outrigger weldment ................................................................................................................ 45
3.8.5 Assembling the outrigger cylinder................................................................................................................... 45
3.9 Other components............................................................................................................................................... 46
3.9.1 Assembling the double-pole main power isolation switch .............................................................................. 46
3.9.2 Assembling battery.......................................................................................................................................... 46
3.9.3 Assembling the DC contactor and converter.................................................................................................... 47
3.9.4 Assembling the charger and work indicator.................................................................................................... 47
3.10 Assembling the hydraulic oil tank ...................................................................................................................48
3.11 Valve group ........................................................................................................................................................50
3.11.1 Installing the spool ........................................................................................................................................ 50
3.11.2 Scissor fork platform control valve ................................................................................................................ 50
3.11.3 Lower lift cylinder control valve ST4639-AB0E(SR3369E) .............................................................................. 51
3.11.4 Upper cylinder valve block ST5243-AC0A (SR4069E) ..................................................................................... 52
3.11.5 Lower cylinder valve block ST5242-AC0C (SR4069E) ..................................................................................... 53
Chapter ⅣCommissioning ......................................................................................................................................55
4.1 Safety instructions .................................................................................................................................................. 57
4.2 Test of basic functions ............................................................................................................................................58
4.2.1 Pick-up inspection............................................................................................................................................ 58
4.2.2 Start/stop test.................................................................................................................................................. 58
4.2.3 Lifting/lowering function test .......................................................................................................................... 58
4.2.4 Steering test..................................................................................................................................................... 59
4.2.5 Horn test .......................................................................................................................................................... 59
4.2.6 Drive and brake function test .......................................................................................................................... 59
4.3 No-load test ............................................................................................................................................................59

Service Manual of Rough terrain
Mobile Elevating Work Platform
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4.3.1 Outrigger leveling test ..................................................................................................................................... 59
4.3.2 Fork and platform test ..................................................................................................................................... 60
4.4 Relief pressure test .................................................................................................................................................60
4.4.1 Lift relief pressure test ..................................................................................................................................... 60
4.4.2 Steering relief pressure test ............................................................................................................................. 60
4.5 Calibration test ....................................................................................................................................................... 61
4.5.1 Inclination calibration...................................................................................................................................... 61
4.5.2 Adjustment of level meter ............................................................................................................................... 61
4.6 Inclination test........................................................................................................................................................62
4.6.1 3°forward/backward inclination test.............................................................................................................. 62
4.6.2 2°leftward/rightward inclination test............................................................................................................. 62
4.7 Load calibration ......................................................................................................................................................62
4.7.1 No-load calibration.......................................................................................................................................... 62
4.7.2 Rated load calibration ..................................................................................................................................... 63
4.8 Overload function...................................................................................................................................................64
4.8.1 Overload function activation ........................................................................................................................... 64
4.8.2 Rated load verification .................................................................................................................................... 65
4.8.3 Test with 1.2 times rated load ......................................................................................................................... 65
4.8.4 Parameter setting............................................................................................................................................ 65
4.9 Load test .................................................................................................................................................................66
4.9.1 Rated load test................................................................................................................................................. 66
4.9.2 Load test (1.2 times rated load)....................................................................................................................... 66
4.10 Inspection of platform settlement (rated load)....................................................................................................66
4.11 No-load lifting time...............................................................................................................................................67
4.11.1 No-load lifting time test................................................................................................................................. 67
4.11.2 Adjustment of lifting speed............................................................................................................................ 67
4.11.3 Adjustment of lowering speed....................................................................................................................... 67
4.12 Lifting height test..................................................................................................................................................68
4.13 Emergency lowering test ......................................................................................................................................68
4.14 Speed parameter adjustment...............................................................................................................................68
4.14.1 High-speed driving......................................................................................................................................... 68
4.14.2 Low speed driving .......................................................................................................................................... 69
4.15 No-load braking distance test............................................................................................................................... 69
4.16 No-load lifting and walking speed test ................................................................................................................. 69
4.17 No-load lifting and walking speed parameter adjustment ...................................................................................70
4.18 Gradeability test and parking brake test (35%) ....................................................................................................70
4.19 Floating test.......................................................................................................................................................... 70
4.20 Outrigger limit test ...............................................................................................................................................70
4.21 Basic operation.................................................................................................................................................. 71
Chapter ⅤMaintenance .........................................................................................................................................73

Service Manual of Rough terrain
Mobile Elevating Work Platform
IV
5.1 Compliance..........................................................................................................................................................75
5.2 Checking the Safety Manual..............................................................................................................................75
5.3 Checking the labels and signs...........................................................................................................................75
5.4 Checking for damaged, loose or missing parts .............................................................................................. 75
5.5 Checking the wires.............................................................................................................................................. 76
5.6 Checking the battery...........................................................................................................................................76
5.7 Checking the electrical contactors.................................................................................................................... 77
5.8 Checking the tires and wheels ..........................................................................................................................77
5.9 Checking the hydraulic tank vent cap ..............................................................................................................77
5.10 Checking the leakage of hydraulic oil ............................................................................................................78
5.11 Checking the hydraulic filter.............................................................................................................................78
5.12 Replacing the hydraulic tank air filter............................................................................................................. 79
5.13 Checking the hydraulic oil level.......................................................................................................................79
5.14 Visual Inspection of the Hydraulic Oil ............................................................................................................79
5.15 Test or Replace the hydraulic oil..................................................................................................................... 79
5.16 Checking the oil level in the reducer ..............................................................................................................80
5.17 Replacing the reducer gear oil........................................................................................................................81
5.18 Checking or replacing the scissor arm slide block....................................................................................... 81
5.19 Regular maintenance ....................................................................................................................................... 81
Chapter ⅥAppendix...............................................................................................................................................83
6.1 Machine fault codes............................................................................................................................................ 85
6.2 Description of harness No. ................................................................................................................................86
6.2.1 Outrigger module harness............................................................................................................................... 86
6.2.2. Chassis harness............................................................................................................................................... 88
6.3 Electrical schematic diagram（SR3369E/SR4069E）......................................................................................90
6.4 Hydraulic schematic diagram..................................................................................................................................91
6.4.1 SR3369E Hydraulic schematic diagram ........................................................................................................... 91
6.4.2 SR4069E Hydraulic schematic diagram ........................................................................................................... 92
6.5 Diagram of common hydraulic part symbols...................................................................................................93
6.6 Diagram of common electrical part symbols.................................................................................................100

Service Manual of Rough terrain
Mobile Elevating Work Platform
V
Foreword
You are welcome to purchase and use the products produced by Lingong Heavy Machinery Co., Ltd.
This manual introduces the technical parameter and maintenance adjustment data of Rough terrain
mobile 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
VI
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.

Service Manual of Rough terrain
Mobile Elevating Work Platform
1
ChapterⅠSafety and EnviroN•ment

Service Manual of Rough terrain
Mobile Elevating Work Platform
2