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
I
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

Service Manual of Rough Terrain Mobile Elevating Work Platform
II
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

Service Manual of Rough Terrain Mobile Elevating Work Platform
III
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

Service Manual of Rough Terrain Mobile Elevating Work Platform
IV
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

Service Manual of Rough Terrain Mobile Elevating Work Platform
V
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

Service Manual of Rough Terrain Mobile Elevating Work Platform
VI
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

Service Manual of Rough Terrain Mobile Elevating Work Platform
VII
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.