LGMG T72J User manual

△
!WARNING
Operators and maintenance
personnel must read and
understand this manual before
operating and maintaining this
machine, otherwise it may lead to
casualties! This manual shall be
properly kept for reference and
check by relevant personnel.
LINGONG HEAVY MACHINERY CO., LTD.
Service Manual
T72J
Telescopic boom Mobile
Elevating Work Platform

Telescopic boom Mobile Elevating Work Platform
Service Manual
880*1230 mm Format: 16, Prints: 8
1st edition in May 2022 1st printing in May 2022
LINGO N G HEAVY MACHINE R Y CO . , LTD.
Address: Floor 12, Building 3, Lushangguo Aocheng, No. 9777, Jingshi Road, Lixia District,
Jinan City, Shandong, China.
Tel: [phone]
Web: www.lgmg.com.cn
Technical service: 86-4009666569
Parts sales: 86-0531-67605016

Service Manual of Telescopic boom Mobile
Elevating Work Platform
II
Contents
Contents..................................................................................................................................................... II
Foreword ...................................................................................................................................................VI
Safety notices...........................................................................................................................................VII
Chapter I Safety and environment............................................................................................................. 1
1.1 Terms and definitions........................................................................................................................ 3
1.2 Compliance....................................................................................................................................... 3
1.3 Before starting the repair.................................................................................................................. 3
1.4 Requirements for work site............................................................................................................... 3
1.5 Maintenance and repair safety specification.................................................................................... 4
1.6 Intended purpose.............................................................................................................................. 5
1.7 Description........................................................................................................................................ 5
Chapter II Product introduction .................................................................................................................. 7
2.1 Machine parameters......................................................................................................................... 9
2.2 Specification and tightening torque of nuts and bolts......................................................................11
Chapter III Repair..................................................................................................................................... 13
3.1 Description...................................................................................................................................... 15
3.2 Platform component ....................................................................................................................... 15
3.2.1 Assembly of platform assembly...................................................................................................... 15
3.2.2 Removal of platform assembly....................................................................................................... 16
3.2.3 Assembly of protective mount........................................................................................................ 16
3.2.4 Assembly of arc-shaped protective cover...................................................................................... 16
3.2.5 Assembly of file box and tool box................................................................................................... 17
3.2.6 Assembly of door lock .................................................................................................................... 17
3.2.7 Assembly of foot switch.................................................................................................................. 17
3.2.8 Assembly of PCU ........................................................................................................................... 17
3.2.9 Assembly of platform valve block................................................................................................... 18
3.2.10 Assembly of buffer rubber mount................................................................................................. 18
3.2.11 Assembly of platform support ...................................................................................................... 18
3.3 Jib assembly................................................................................................................................... 18
3.3.1 Assembly of jib structural parts ...................................................................................................... 18
3.3.2 Lowering and assembly of jib......................................................................................................... 18
3.3.3 Removal of jib................................................................................................................................. 19
3.3.4 Fly jib cylinder assembly................................................................................................................. 20
3.3.5 Removal of the fly jib cylinder......................................................................................................... 20
3.3.6 Removal of saddle swing cylinder.................................................................................................. 21
3.3.7 Assembly of load cell...................................................................................................................... 21
3.3.8 Limit block assembly ...................................................................................................................... 21
3.3.9 Assembly of swing motor mounting bracket................................................................................... 21
3.3.10 Assembly of upper leveling cylinder ............................................................................................ 22

Service Manual of Telescopic boom Mobile
Elevating Work Platform
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3.3.11 Removal of upper leveling cylinder.............................................................................................. 22
3.4 Cable carrier assembly................................................................................................................... 23
3.4.1 Assembly of cable carrier............................................................................................................... 23
3.4.2 Removal of cable carrier................................................................................................................. 24
3.5 Boom frame assembly.................................................................................................................... 26
3.5.1 Assembly of boom frame................................................................................................................ 27
3.5.2 Boom frame removal...................................................................................................................... 28
3.5.3 Subassembly of telescopic cylinder ............................................................................................... 30
3.5.4 Assembly of telescopic cylinder ..................................................................................................... 31
3.5.5 Removal of telescopic cylinder....................................................................................................... 33
3.5.6 Assembly of luffing cylinder............................................................................................................ 34
3.5.7 Removal of the luffing cylinder....................................................................................................... 35
3.5.8 Assembly of lower leveling cylinder ............................................................................................... 36
3.5.9 Removal of lower leveling cylinder................................................................................................. 37
3.5.10 Rope............................................................................................................................................. 37
3.6 Transmission component ............................................................................................................... 39
3.6.1 Installation of flywheel coupling...................................................................................................... 39
3.6.2 Removal of flywheel coupler .......................................................................................................... 39
3.7 Variable displacement pump.......................................................................................................... 39
3.7.1 Assembly of open variable displacement pump............................................................................. 39
3.7.2 Removal of open-type variable displacement pump...................................................................... 39
3.7.3 Walking variable displacement pump assembly ............................................................................ 40
3.7.4 Removal of walking variable displacement pump.......................................................................... 41
3.8 Hydraulic oil tank, fuel tank............................................................................................................. 41
3.8.1 Assembly of hydraulic oil tank........................................................................................................ 41
3.8.2 Removal of hydraulic oil tank ......................................................................................................... 43
3.8.3 Fuel tank assembly......................................................................................................................... 43
3.8.4 Fuel tank removal........................................................................................................................... 44
3.9 Axle assembly................................................................................................................................. 44
3.9.1 Assembly of floating cylinder.......................................................................................................... 44
3.9.2 Removal of floating cylinder........................................................................................................... 44
3.9.3 Assembly of steering cylinder......................................................................................................... 45
3.9.4 Removal of steering cylinder.......................................................................................................... 45
3.9.5 Subassembly of walking reducer.................................................................................................... 45
3.9.6 Subassembly of walking motor....................................................................................................... 46
3.9.7 Assembly of steering connecting disc............................................................................................ 46
3.9.8 Removal of the reducer.................................................................................................................. 46
3.9.9 Assembly of wheel.......................................................................................................................... 47
3.9.10 Removal of wheel......................................................................................................................... 47
3.10 Assembly of rotary table................................................................................................................. 47

Service Manual of Telescopic boom Mobile
Elevating Work Platform
IV
3.10.1 Lowering and assembly of rotary table........................................................................................ 47
3.10.2 Lowering and assembly of center slewing joint........................................................................... 47
3.10.3 Lowering and assembly of slewing reducer................................................................................. 48
3.10.4 Removal of slewing reducer......................................................................................................... 48
3.10.5 Assembly of slewing mechanism guard plate.............................................................................. 49
3.11 Other component............................................................................................................................ 49
3.11.1 Assembly of travel switch............................................................................................................. 49
3.11.2 Assembly of DC power switch ..................................................................................................... 49
3.11.3 Assembly of emergency power unit............................................................................................. 49
3.11.4 Assembly of tilt sensor................................................................................................................. 50
3.11.5 Warning lamp assembly............................................................................................................... 50
3.12 Valve............................................................................................................................................... 51
3.13 Bleeding of cylinder........................................................................................................................ 54
3.13.1 Bleeding of walking variable displacement pump and gear pump.............................................. 54
3.13.2 Bleeding of slewing reducer......................................................................................................... 54
3.13.3 Bleeding of walking motor............................................................................................................ 54
3.13.4 Bleeding of steering cylinder........................................................................................................ 54
3.13.5 Bleeding of boom luffing cylinder and lower leveling cylinder..................................................... 54
3.13.6 Bleeding of boom telescopic cylinder .......................................................................................... 54
3.13.7 Bleeding of fly jib luffing cylinder and upper leveling cylinder ..................................................... 55
3.13.8 Bleeding of platform swing cylinder............................................................................................. 55
3.13.9 Bleeding of floating cylinder......................................................................................................... 55
Chapter V Commissioning........................................................................................................................ 57
4.1 Safety notices................................................................................................................................. 59
4.2 Commissioning process................................................................................................................. 59
4.2.1 Pick-up inspection .......................................................................................................................... 59
4.2.2 Liquid level detection...................................................................................................................... 59
4.2.3 Clearance detection........................................................................................................................ 60
4.2.4 Start test.......................................................................................................................................... 60
4.2.5 Basic operation test of GCU........................................................................................................... 61
4.2.6 Basic operation test of platform control unit................................................................................... 63
4.2.7 Drive enable system test................................................................................................................ 65
4.2.8 Steering pressure test..................................................................................................................... 65
4.2.9 Slewing pressure test..................................................................................................................... 66
4.2.10 Walking pump overflow pressure test.......................................................................................... 66
4.2.11 Function pump overflow pressure test......................................................................................... 66
4.2.12 Floating test of machine............................................................................................................... 67
4.2.13 Calibration of rated load............................................................................................................... 67
4.2.14 1.1 times rated load test............................................................................................................... 67
4.2.15 1.25 times load test...................................................................................................................... 67

Service Manual of Telescopic boom Mobile
Elevating Work Platform
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4.2.16 Large rated load (450) test........................................................................................................... 68
4.2.17 Settlement test............................................................................................................................. 68
4.2.18 Lifting height test.......................................................................................................................... 69
4.2.19 Operation time test....................................................................................................................... 69
4.2.20 Driving speed (high speed) test................................................................................................... 71
4.2.21 Braking distance test.................................................................................................................... 71
4.2.22 Limit driving speed test................................................................................................................ 71
4.2.23 Tilt sensor test.............................................................................................................................. 72
4.2.24 Climbing test (45%)...................................................................................................................... 72
Chapter V Maintenance............................................................................................................................ 73
5.1 Compliance..................................................................................................................................... 75
5.2 Inspection of slewing ring............................................................................................................... 75
5.3 Inspection of arm rod wear washer................................................................................................ 75
5.4 Inspection of rope........................................................................................................................... 76
5.5 Check the oil level in the reducer................................................................................................... 76
5.6 Inspection of hydraulic oil and filter................................................................................................ 77
5.7 Maintenance of Deutz engine......................................................................................................... 78
5.7.1 Check of engine oil level ................................................................................................................ 78
5.7.2 Replacement of engine oil and filter............................................................................................... 78
5.7.3 Check for fuel leakage.................................................................................................................... 79
5.7.4 Draining or replacement of fuel filter.............................................................................................. 80
5.7.5 Check of engine air filter................................................................................................................. 81
5.7.6 Cleaning or replacement of air filter............................................................................................... 81
5.7.7 Check of coolant level .................................................................................................................... 81
5.7.8 Adding or replacement of engine coolant....................................................................................... 81
5.7.9 Check the engine belt..................................................................................................................... 82
5.8 Scheduled maintenance................................................................................................................. 83
5.9 Engine fault diagnosis .................................................................................................................... 84
Chapter VI Annex..................................................................................................................................... 91
6.1 System DTC ................................................................................................................................... 93
6.2 Description of harness wire size..................................................................................................... 95
6.2.1 Main harness.................................................................................................................................. 95
6.2.2 Valve block harness........................................................................................................................ 96
6.3 Schematic diagram......................................................................................................................... 98
6.3.1 Electrical schematic diagram.......................................................................................................... 98
6.3.2 Hydraulic schematic diagram......................................................................................................... 99
6.4 Symbols of common hydraulic parts ............................................................................................ 100
6.5 Schematic diagram of symbols of common electrical components............................................. 107

Service Manual of Telescopic boom Mobile
Elevating Work Platform
VI
Foreword
Thanks for purchasing the products produced by Lingong Heavy Machinery Co., Ltd. This Manual
introduces the technical parameters and maintenance and adjustment data of T72J straight-arm lifting
platform, and explains the troubleshooting and repair process for qualified maintenance personnel.
The relevant content in this manual is correct at the time of publication. Due to continuous improvement
of product structure and performance, we may change the description on design, operation and
maintenance without prior notice. For the latest machine information and questions about this manual,
please consult our company. At the same time, we encourage readers to give error feedback to Lingong
Heavy Machinery Co., Ltd. and make suggestions for improvement. All suggestions will be carefully
considered in the future publishing and printing of this manual.
The copyright of this manual is owned by Lingong Heavy Machinery Co., Ltd.. No reproduction or
reprinting is allowed without the written permission of our company.
△
!WARNING
Only specially trained and qualified personnel can operate, repair and maintenance this
machine.
Incorrect operation, maintenance and repair are in danger and may result in personal
injury or death.
Before operating or maintaining this machine, the operator shall read this manual
carefully at first. Do not operate, maintain or repair this platform without reading and
understanding this manual.
Please load the machine in strict accordance with the rated load. The user shall be
responsible for any consequences caused by overload or modification without
permission.
The operation regulations and prevention provided by this manual are only applicable
for the purposes intended for this machine. For operations outside the specifications
but not prohibited, make sure that the operation will not cause harm to you or others.

Service Manual of Telescopic boom Mobile
Elevating Work Platform
VII
Safety notices
Operators shall understand and abide by the current national and local safety provisions. If there are no
national or local provisions, the safety instructions in this manual shall apply.
Most of the accidents are caused by failure to comply with the operation and maintenance regulations of
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 repair. Failure to comply with the
instructions and safety rules in this Manual and on the machine will result in death or serious injury.
Since it is not possible to foresee all possible dangers, the description on safety in this manual and on
the machine may not include all safety precautions. If steps and actions not recommended in this manual
are used, you must ensure the safety of yourself and others and prevent damage to the machine. If you
are not sure about the safety of some operations, please contact our company or dealer.
Most operations require basic mechanical, hydraulic and electrical skills, and some operations require
specialized skills, tools, lifting equipment and suitable workshops. In these cases, we strongly
recommend that the maintenance and repair shall be carried out at the service center of the dealer
authorized by Lingong Heavy Machinery Co., Ltd.
The prevention measures for maintenance and repairing given in this manual apply only when the
machine is used for the specified purposes. If the machine is used for the purpose not listed in this
manual, then our company will not assume any safety liability, and the safety liability in such operations
shall be borne by the user and the operator.
Under no circumstances shall the operations prohibited in this manual be carried out.
The following marker words are used to identify safety information in this manual:
△
!DANGER-indicating dangers that, if not avoided, will lead to serious injury or
death. This term is also used for cases that, if not avoided, will cause serious
damage to the machine.
△
!WARNING-indicating potential dangers that, if not avoided, will cause serious
injury or death. WARNING-indicating potential dangers that, if not avoided, will cause
serious injury or death.
△
! CAUTION - indicating cases that, if not avoided, may cause minor or
moderate injuries. This term is also used for cases , if not avoided, may
cause serious damage to the machine.

Service Manual of Telescopic boom Mobile
Elevating Work Platform
1
Chapter I Safety and environment

Service Manual of Telescopic boom Mobile
Elevating Work Platform
2

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Elevating Work Platform
3
1.1 Terms and definitions
Administrator: the entity unit or individual who directly controls the use and application of the lifting
platform, usually the owner, the lessor or the owner's trustee who obtains the control
rights.
Operator: the personnel who have received relevant training, possess qualified knowledge and
practical experience, and can manipulate lifting platform.
Qualified personnel: those have recognized academic qualifications, certificates and professional
identity, or have been trained and experienced with relevant professional
knowledge, can effectively prove their ability to solve difficulties met in relevant
matters, works and projects.
Safety notice: safety information issued by the Lingong Heavy Machinery Co., Ltd.
1.2 Compliance
1. Maintenance procedure shall be completed by qualified personnel trained in this maintenance of the
machine.
2. Immediately mark the damaged or fault machine and withdraw it out of the service.
3. Repair any faulty or damaged machine before operating it.
1.3 Before starting the repair
1. Read, understand and observe the safety rules and maintenance instructions in the corresponding
operating manual on the machine.
2. Ensure that all the necessary tools and parts are ready.
3. This manual is only applicable to the machine and parts manufactured and sold by Lingong Heavy
Machinery Co., Ltd.
4. Please read each step completely and carefully and follow them strictly. Try to use a shortcut to
repair may cause danger.
5. Be sure to use the goggles and other PPEs when necessary.
6. When lifting or placing a load, be sure to pay attention to the potential risk of pinch injury caused by
moving parts, free swinging or unstable components and parts, etc. Always wear qualified steel
protective shoes.
1.4 Requirements for work site
The machine shall be able to work under the following safety conditions:
1. The environment humidity shall be less than 90%(+25 ℃).
2. The machine shall be able to work normally under the following safety conditions:
-The ambient temperature shall be -20 ℃~ +40 ℃;
- The wind speed shall not be greater than 12 m/s（28mph）;
- The vehicle shall never be used in corrosiveness environment with such materials as inflammable and
explosive or acid and alkali.
3. During normal operation or repair, the movement of the mechanism and components and parts may
cause danger to the human body, and protective device shall be set.
4. Measures shall be taken to prevent danger caused by components and parts falling on the platform.
5. When repairing, place a qualified fire extinguisher in a readily available position.
6. Keep the work site clean and tidy to prevent dirt from entering the machine and causing damage to
the components and parts.
7. Please ensure that the forklift, crane or other lifting or supporting equipment are strong enough to
support and stabilize the weight to be lifted.

Service Manual of Telescopic boom Mobile
Elevating Work Platform
4
8. During repair, please do not reuse disposal fastener (such as cotter pin and self-locking nut), so as
to avoid abnormal functioning due to reuse of such parts.
9. Please dispose of the discarded fluid correctly in an environmentally friendly way.
10. Make sure the work site is well ventilated and well lit.
1.5 Maintenance and repair safety specification
1. The following precautions shall be taken before the adjustment and repair of the machine:
Park the machine on a solid and level ground;
Block the front and rear of the wheel to ensure that the wheel will not rotate or move;
Cut off the power supply and ensure that the machine is in a non-start status;
Set all control devices in the "off" status to avoid unexpected start of operating system;
If possible, lower the platform to the lowest position, otherwise, ensure that it will not fall;
Before loosening or removing the hydraulic component, release the hydraulic oil pressure of the
hydraulic pipeline;
Place the safety support 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. Replacement of parts
The parts for replacement shall be genuine parts of our company, otherwise we will refuse to maintain or
repair the product.
4. Service Bulletin
The machine maintenance and repair by users shall be in strict accordance with the service bulletin
issued by the Lingong Heavy Machinery Co., Ltd.
5. Vehicle welding repair
1) First, shut down the engine and cut off the low-voltage power supply;
2) The worker shall have special operation certificate;
3) Clean up the surrounding flammables and apply for welding permit;
4) Protect the vehicle body to prevent splashing and fire;
5) Operate in strict accordance with the welding process;
6. Precautions of the battery maintenance
1) Battery run-out is strictly prohibited during storage. It is strictly prohibited to keep the battery in the
run-out status during storage. Please charge the battery immediately after the battery runs out.
2) Correctly control the charging time. In the process of use, accurately control the charging time
according to the actual situation, and control the charging frequency with reference to the usual use
frequency and driving mileage.
3) Prevent exposure to the sun. Environment with too high temperature will increase the internal
pressure and electrolyte loss of the battery, causing battery activity reduction and accelerating polar
plate aging. Therefore, the vehicle is strictly prohibited from being exposed to the sun and should be
parked in a cool place.
4) Check regularly. If there is a problem with the battery during use, please promptly go to the sales
center or maintenance department of the dealer for inspection and repair. This can relatively extend
the servicing life of battery pack and maximize your maintenance cost.
7. Coolant
When the radiator is overheated, it is not allowed to open the radiator cap to prevent scalding by boiling

Service Manual of Telescopic boom Mobile
Elevating Work Platform
5
water. Please wait until the water cools down before opening the radiator cap.
1.6 Intended purpose
This machine is only intended for lifting personnel and their tools and materials to the high-altitude work
site.
1.7 Description
Most of the repair process can only be carried out by trained professional service personnel in properly
equipped workshops. After the fault is eliminated, select the appropriate repair step.
Carry out the disassembly steps until the repair can be completed. Then reassemble in the order reverse
to disassembly.
Maintenance and repair in authorized service center of the dealer of Lingong Heavy Machinery Co., Ltd.
are strongly recommended.

Service Manual of Telescopic boom Mobile
Elevating Work Platform
6

Service Manual of Telescopic boom Mobile
Elevating Work Platform
7
Chapter II Product introduction

Service Manual of Telescopic boom Mobile
Elevating Work Platform
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Service Manual of Telescopic boom Mobile
Elevating Work Platform
9
2.1 Machine parameters
T72J(T2218J0WND4AH2000) Machine performance parameters
Item
Parameter/description
Item
Parameter/description
Rated load
300kg/6611bs
Rotary table rotation time per
cycle (stowed) (s)
78-86
2 persons +140 kg/3091 bs
object
Rotary table rotation time per
cycle (extended) (s)
125-165
Limited load
450kg/9921bs
Boom lifting time (s)
60-70
3 people+210 kg/463 Lbs
object
Boom lowering time (s)
60-70
Total weight (kg/bs)
12300/27117
Boom extension time (s)
65-75
Max. working height (m/ft)
23.8/78
Boom retraction time (s)
60-70
Max. platform height (m/ft)
21.8/71.5
Jib lifting time (s)
40-50
Max. horizontal extension (m/ft)
17.5/57.4
Jib lowering time (s)
20-35
Max. travel speed (stowed)
(km/h/mph)
4.8±0.25/3±0.25
Platform slewing time (s)
13-26
Max. travel speed
(extended)(km/h/mph)
0.8±0.05/0.5±0.05
Maximum
allowable
inclination of
chassis
Along
boom
frame
4.5°
Climbing speed
(stowed)(km/h/mph)
1.2≤v≤1.5/0.7≤v≤0.9
Boom
frame
orthogonal
4.5°
Climbing speed
(extended)(km/h/mph)
0.3≤v≤0.8/0.2≤v≤0.5
Max. operation effort (N)
400
Min. turning radius (inner
wheel)(m/ft)
2.5/8.1
Maximum allowable wind
speed (m/s/mph)
12.5/28
Min. turning radius (outer
wheel)(m/ft)
5.5/17.8
Drive type
4WD
Theoretical maximum gradeability
(no-load, stowed)
45％
Front axle steering
Max. braking distance (no-load,
stowed)(m/ft)
1≤s≤1.5/3.3≤s≤4.9
Main dimensions
Item
Parameter/description
Item
Parameter/description
Overall length (mm/in)
10600/417
Wheelbase (mm/in)
2510/99
Overall width (mm/in)
2490/98
Track width (mm/in)
2130/84
Overall height (mm/in)
2790/110
Minimum ground
clearance (middle)
(mm/in)
395/15.5
Working platform
dimension (length ×width)
(mm/in)
2440×900/96×35
Tire spec.
355/55D 625
Engine system
Item
Parameter/description
Item
Parameter/description
Model
D2.9L4
Rated speed (r/min)
2600
Displacement (ml)
2900
Maximum torque (N·m)
147/1600rpm
Rated power (kW)
36.4
Emission standard
EPA Tier 4F
Engine fuel usage environment
Ambient temperature
#0 diesel fuel at ambient
temperature ≥4 ℃
Ambient temperature
-10# diesel fuel at
ambient temperature
≥-5 ℃
Ambient temperature
-20# diesel fuel at
ambient temperature
≥-14 ℃
Ambient temperature
#-35 diesel fuel at
ambient temperature
≥-29 ℃
Transmission system
Item
Parameter/description
Walking reducer
Rated output torque (N •
3390

Service Manual of Telescopic boom Mobile
Elevating Work Platform
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m)
Gear ratio
57.49：1
Slewing reducer
Rated output torque (N •
m)
1690
Gear ratio
36.13：1
Hydraulic system
Item
Parameter/description
Walking system
Type
Closed system
Pump displacement (ml/r)
46
Max. working pressure (MPa/psi)
28/4061
Motor displacement (ml/r)
38
Functional system
Type
Open system
Pump displacement (ml/r)
28
Lifting system
Max. working pressure (MPa/psi)
23/3336
Slewing
system
Max. working pressure (MPa/psi)
23/3336
Motor displacement (ml/r)
60
Steering
system
Max. working pressure (MPa/psi)
23/3336
Floating system
Type
/
Pump displacement (ml/r)
/
Max. working pressure (MPa/psi)
/
Electrical system
Item
Parameter/description
Battery
Output voltage (V)
12
Capacity (Ah)
120 (20-hour discharge rate)
Control system
Voltage (V)
12
Filling volume of fluids
Item
Parameter/description
Item
Parameter/description
Hydraulic oil (L/gal_US)
180/47.5
Engine oil (L/gal_US)
8.5/2.2
Walking reducer gear oil
(L/gal_US)
0.68×4/0.18×4
Engine antifreeze
(L/gal_US)
7.7/2.0
Slewing gearbox gear oil
(L/gal_US)
0.45/0.12
Fuel tank capacity
(L/gal_US)
100/26.4
Table 1: Tightening torque of metric-threaded and imperial-threaded fittings and plugs (unit: N•m)
Tightening torque of metric-threaded oil port
Tightening torque of the imperial threaded oil port
Pipe
diame
ter
Thread
specificatio
n (mm)
Joint type
Plug
Pipe
diameter
Thread
specificati
on (Inch)
Joint type
Plug
Type E
Type F
VSTI-E
Type E
Type F
VSTI-ED
6L
M10X1.0
27
22
16
6L
G1/8A
22
16
16
8L
M12X1.5
37
32
27
8L
G1/4A
37
32
32
10L
M14X1.5
58
48
37
10L
G1/4A
37
32
/
12L
M16X1.5
75
58
58
12L
G3/8A
75
58
63
15L
M18X1.5
95
75
70
15L
G1/2A
120
95
85
18L
M22X1.5
140
115
95
18L
G1/2A
120
95
/
22L
M28X2.0
190
160
140
22L
G3/4A
190
160
140
28L
M33X2.0
325
220
235
28L
G1A
325
220
210
35L
M42X2.0
470
295
380
35L
G11/4A
470
315
470
42L
M48X2.0
565
380
/
42L
G11/4A
565
380
470
6s
M12X1.5
42
37
/
6s
G1/4A
42
37
/
8s
M14X1.5
53
48
/
8s
G1/4A
42
37
/
10s
M16X1.5
75
58
/
10s
G3/8A
85
63
/
12s
M18X1.5
95
75
/
12s
G3/8A
85
63
/
14s
M20X1.5
130
85
/
14s
G1/2A
120
95
/

Service Manual of Telescopic boom Mobile
Elevating Work Platform
11
16s
M22X1.5
140
105
/
16s
G1/2A
120
95
/
20s
M27X2.0
190
180
/
20s
G3/4A
190
160
/
25s
M33X2.0
325
325
/
25s
G1A
325
220
/
30s
M42X2.0
470
345
/
30s
G11/4A
470
315
/
38s
M48X2.0
565
440
/
38s
G11/2A
565
380
/
Table 2:Tightening torque of UN-threaded fittings and plugs (unit: N•m)
Product series
Thread UN/UNF
Non-adjustable
assembly torque N•m
Non-adjustable
assembly torque N•m
EO-L
7/16-20 UN(F)
23
18
1/2-20 UN(F)
28
28
9/16-18 UN(F)
34
34
3/4-16 UN(F)
60
55
7/8-14 UN(F)
115
80
1-1/16-12 UN(F)
140
100
1-5/16-12 UN(F)
210
150
1-5/8-12 UN(F)
290
290
1-7/8-12 UN(F)
325
325
EO-S
7/16-20 UN(F)
20
20
1/2-20 UN(F)
40
40
9/16-18 UN(F)
46
46
3/4-16 UN(F)
80
80
7/8-14 UN(F)
135
135
1-1/16-12 UN(F)
185
185
1-5/16-12 UN(F)
270
270
1-5/16-12 UN(F)
270
270
1-5/8-12 UN(F)
340
340
1-7/8-12 UN(F)
415
415
Note:
1) Table 1 includes the metric thread fitting and Imperial threaded fitting, and table 2 includes the
un-threaded fitting; a +10％error is allowed for torque value;
2) The torque values in Table 1 and Table 2 are determined based on the condition that the connected
part is made of steel. The tightening torque for connected part made of aluminum is to be
determined according to the 60% of values in Table 2 and Table 3. The value is to be rounded off to
the integer position after calculation.
3) For Parker joint, torque value shall be selected according to the name and specification, and for
common joint, torque value shall be selected according to the thread specification.
Example:
1) GE 28 L M ED OMD A3 C: GE represents straight joint, 28 represents pipe diameter, L represents
common pressure, M represents metric thread, ED represents E-type elastic seal, OMD represents
unavailability of nut ferrule, and A3 C represents galvanized surface; According to the 28L M ED, the
torque value can be selected from Table 1, i.e. 325 N•m
2) GE O 22L R 3/4 OMDA3C : O represents the F-type O-ring, R represents the inch thread form, and
3/4 represents the thread specification G3/4; According to O 22L R3/4, the torque value can be
selected from Table 2, i.e. 160 N•m;
3) GE O 20 S R OMDCF: S indicates the heavy pressure type, and the torque value selected
according to O 20 S R is: 160 N•m;
2.2 Specification and tightening torque of nuts and bolts
Table 3: Tightening torque of metric-threaded nuts (Unit: N•m)
Pipe
diameter
Thread
specification
Tightening
torque
Pipe
diameter
Thread
specification
Tightening torque
N·m
06L
M12X1.5
16
06s
M14X1.5
27

Service Manual of Telescopic boom Mobile
Elevating Work Platform
12
08L
M14X1.5
22
08s
M16X1.5
42
10L
M16X1.5
32
10s
M18X1.5
53
12L
M18X1.5
42
12s
M20X1.5
63
15L
M22X1.5
58
14s
M22X1.5
80
18L
M26X1.5
90
16s
M24X1.5
85
22L
M30X2
115
20s
M30X2
125
28L
M36X2
135
25s
M36X2
180
35L
M45X2
220
30s
M45X2
260
42L
M52X2
345
38s
M52X2
370
Note:
1) Al error of + 10% is allowed for the torque in Table 2;
2) The torque value in Table 3 is determined according to the fact that the connected part is made of
steel. The tightening torque of connected part made of aluminum is to be determined according to
60% of values in Table 1.After calculation, the value is to be rounded off to the integer position.
3) For Parker hose, right-angle fitting and tee fitting, the torque value should be selected according to
name and spec., and for common hose, right-angle fitting and tee fitting, the torque value should be
selected according to thread specification.
Example:
1) F481 CACF 2815 16: F481 represents the form of buckling and rubber hose, CACF represents the
form of joint at both ends, CA represents the 24 °cone O-type seal ring rotation nut, CF represents
the 90 °elbow of 24 °cone O-type seal ring rotation nut , and 2815 represents the connection spec.
of joint at both ends of the rubber hose. Based on this, the torque is selected: the torque at the 28
end is 135 N •m, and the torque at the 15 end is 58 N •m;
2) F412 SN CACF 1210 06: SN stands for heavy pressure hose, the torque at end 12 is 63N•m, and
the torque at end 10 is 53N•m;
3) EW15 LOMDA3 C: EW indicates right-angle combined joint, and the torque value selected from
table 1 according to 15 L is 32 N•m.
Table 4: Tightening torque of ordinary bolts (unit: N•m)
Bolt strength grade
Yield strength N/MM2
Nominal diameter of bolt mm
6
8
10
12
14
Tightening torque N·m
4.6
240
4～5
10～12
20～25
36～45
55～70
5.6
300
5～7
12～15
25～32
45～55
70～90
6.8
480
7～9
17～23
33～45
58～78
93～124
8.8
640
9～12
22～30
45～59
78～104
124～165
10.9
900
13～16
30～36
65～78
110～130
180～210
12.9
1080
16～21
38～51
75～100
131～175
209～278
Bolt strength grade
Yield strength N/MM2
Nominal diameter of bolt mm
16
18
20
22
24
Tightening torque N·m
4.6
240
90～110
120～150
170～210
230～290
300～377
5.6
300
110～140
150～190
210～270
290～350
370～450
6.8
480
145～193
199～264
282～376
384～512
488～650
8.8
640
193～257
264～354
376～502
521～683
651～868
10.9
900
280～330
380～450
540～650
740～880
940～1120
12.9
1080
326～434
448～597
635～847
864～1152
1098～1464
Bolt strength grade
Yield strength N/MM2
Nominal diameter of bolt mm
27
30
33
36
39
Tightening torque N·m
4.6
240
450～530
540～680
670～880
900～1100
928～1237
5.6
300
550～700
680～850
825～1100
1120～1400
1160～1546
6.8
480
714～952
969～1293
1319～1759
1694～2259
1559～2079
8.8
640
952～1269
1293～1723
1759～2345
2259～3012
2923～3898
10.9
900
1400～1650
1700～2000
2473～3298
2800～3350
4111～5481
12.9
1080
1606～2142
2181～2908
2968～3958
3812～5082
4933～6577