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Agricultural tractors - Test procedures - Part 15: Centre of gravity
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GB/T 3871.15-2025
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Agricultural tractors -- Test procedures -- Part 15: Centre of gravity
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GB/T 3871.15-2006
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Basic data | Standard ID | GB/T 3871.15-2025 (GB/T3871.15-2025) | | Description (Translated English) | Agricultural tractors - Test procedures - Part 15: Centre of gravity | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | T61 | | Classification of International Standard | 65.060.10 | | Word Count Estimation | 34,392 | | Date of Issue | 2025-10-31 | | Date of Implementation | 2026-05-01 | | Older Standard (superseded by this standard) | GB/T 3871.15-2006 | | Issuing agency(ies) | State Administration for Market Regulation and Standardization Administration of China | GB/T 3871.15-2025: Agricultural tractors - Test procedures - Part 15: Centre of gravity---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 65.060.10
CCST61
National Standards of the People's Republic of China
Replaces GB/T 3871.15-2006
Agricultural Tractor Testing Procedures
Part 15.Center of Mass
Part 6.Centre of Gravity (MOD)
Published on 2025-10-31
Implemented on May 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface III
Introduction V
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Test Equipment 1
5 General Requirements 2
6.Test Methods 2
7 Test Report 8
Appendix A (Informative) Structure Numbering Comparison Table 9
Appendix B (Normative) Determination of Vertical Coordinate h---Inclination Method (Calculation Method) 11
Appendix C (Informative) Test Report Format 24
Appendix D (Informative) Example of determining the vertical coordinate h---tilt method (calculation method) 25
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document is Part 15 of GB/T 3871, "Test Procedures for Agricultural Tractors". GB/T 3871 has already published the following parts.
---Part 1.General Requirements;
---Part 2.Measurement of Overall Machine Parameters;
---Part 3.Power Take-Off Shaft Power Test;
---Part 4.Lifting Capacity of Rear Tri-Point Suspension System;
---Part 5.Turning Circle and Through Circle Diameter;
---Part 6.Determination of Braking Performance of Agricultural and Forestry Vehicles;
---Part 7.Driver's Forward Visibility;
---Part 8.Noise Measurement;
---Part 9.Traction Power Test;
---Part 10.Low Temperature Start-up;
---Part 11.High-Temperature Performance Testing;
---Part 12.Usage Testing;
---Part 13.Exhaust Smoke Measurement;
---Part 14.Non-mechanical power output shaft;
---Part 15.Center of Mass;
---Part 16.Shaft Power Measurement;
---Part 17.Engine Air Filter;
---Part 18.Hydraulic Power at the Tractor-Implement Interface;
---Part 19.Steering Performance of Wheeled Tractors;
---Part 20.Bump Test;
---Part 21.Stability.
This document replaces GB/T 3871.15-2006 "Test Procedures for Agricultural Tractors Part 15.Center of Gravity", and is consistent with GB/T 3871.15-
Compared to.2006, aside from structural adjustments and editorial changes, the main technical changes are as follows.
a) Specialized equipment for the tilting method and the mass cycle method has been added (see 4.2.2 and 4.2.3);
b) Added requirements for the driver's seat weight and tractor counterweight status (see 5.2);
c) The requirement for non-linear states of the hinge mechanism has been removed (see 5.4,.2006 edition);
d) The requirement for suspension locking has been added (see 5.5);
e) Requirements for outdoor test wind speed, wheels, transmission, and parking brake have been added, and measures to prevent abnormal rolling have been added (see 5.7 and...).
5.8);
f) Added requirements for the unit of angle measurement and permissible error (see 5.9);
g) A method for calculating the lateral coordinate of the center of gravity when there are differences in the wheel track between each axle of a wheeled tractor has been added (see 6.2);
h) When determining the vertical coordinate using the tilt method, an elevation method can be used (see 6.3.1.1);
i) The determination of vertical coordinates has been added—the tilt method (calculation method) (see 6.3.1.3, Appendix B);
j) The determination of vertical coordinates has been added—the tilt method (see 6.3.2);
k) Added the determination of vertical coordinates---mass cycle method (see 6.3.3);
This document is modified to adopt ISO 789-6.2019 "Test procedures for agricultural tractors - Part 6.Center of mass".
Compared with ISO 789-6.2019, this document has undergone many structural adjustments. A comparison table of the structural numbering changes between the two documents is provided.
See Appendix A.
The technical differences between this document and ISO 789-6.2019, and the reasons therefor, are as follows.
a) Descriptions of the test methods in the standard have been added (see Chapter 1), corresponding to the test methods added in this document;
b) The terms and definitions of "agricultural tractor" and "wheelbase" have been deleted, and the normative reference GB/T 6960.1 (see page 3) has been added.
(Chapter), to enhance the usability of this document;
c) Additional testing equipment for the tilt method and the mass cycle method (see 4.1 and 4.2) has been added to meet the needs of the new testing methods;
d) Increased requirements for fixing the weights and counterweights (see 5.2) to improve measurement accuracy;
e) Requirements for fluid-filled tires have been added (see 5.4), expanding the scope of this document;
f) Increased wind speed requirements for outdoor testing (see 5.7) to improve measurement accuracy and test safety;
g) Increased requirements for the condition of wheels, transmission, and parking brake; added measures to prevent abnormal rolling (see 5.8); and improved measurement accuracy.
Accuracy and safety of the experiment;
h) An angle measurement unit and permissible error have been added (see 5.9) to meet the angle measurement needs in the pitch and roll methods;
i) An improved method for calculating the lateral coordinate of the center of gravity when there are differences in the wheel track width per axle of a wheeled tractor (see 6.2) was added to improve the accuracy of the measurement;
j) A method for lifting the tractor has been added (see 6.3.1.1), improving the operability of the experiment;
k) A simplified calculation method for wheeled tractors has been added (see 6.3.1.3) to improve testing efficiency;
l) The determination of vertical coordinates—the tilt method (see 6.3.2)—has been added, improving experimental efficiency;
m) The determination of vertical coordinates—the mass cycle method (see 6.3.3)—has been added, improving the applicability of this document;
n) Unify the angle unit to degrees (°) (see Appendix B) to improve the practicality of this document.
The following editorial changes have been made to this document.
---The standard title "Agricultural Tractor Test Procedures Part 6.Center of Gravity" will be changed to "Agricultural Tractor Test Procedures".
Part 15.Center of Mass;
---Content related to the ISO and IEC databases for maintaining standardized terminology has been removed;
---The rectangular coordinates of the rotating perpendicular line have been changed [see Figure B.9b];
---The data description and calculation formula for "the rectangular coordinates of two points on line A when the front axle is lifted (see Figure B.9)" have been changed, as well as the data description and calculation formula for "the front axle is lifted (see Figure B.9)".
The data description of "coordinates of two points on line A when the shaft is lifted (polar coordinate transformation)" is shown in Table B.2.
---The calculation formulas for "coordinates (rectangular coordinates, see Figure B.9) of two selected points on line B when the rear axle is lifted" and "rotation angle θr2" have been modified.
The symbols and calculation formulas for "coordinates of two points on line B after rotation by θf2", and the calculation formula for "coordinates of two points on line A after rotation by θf2".
The calculation formulas for "rearrangement to rectangular coordinates" are shown in Table B.4.
---The code name for tr2 has been changed (see Table D.1).
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Tractor Standardization Technical Committee (SAC/TC140).
This document was drafted by. Luoyang Xiyuan Vehicle and Power Testing Institute Co., Ltd., Shandong Academy of Agricultural Machinery Sciences, and China YTO Group Corporation.
Group Co., Ltd., Agricultural Mechanization General Station of the Ministry of Agriculture and Rural Affairs, Anhui Provincial Agricultural Machinery Testing and Appraisal Station, Luoyang Tractor Research Institute Co., Ltd., Weifang
Chai Leiwo Smart Agriculture Technology Co., Ltd., Guangxi Hepu Huilaibao Machinery Manufacturing Co., Ltd., Guangxi University of Science and Technology, Ningbo Benye Heavy Machinery
Gongyi Co., Ltd.
The main drafters of this document are. Jia Fang, Chen Guangkuo, Jin Donghui, Song Renlong, Zhang Kai, Qiao Jianxiang, Chen Song, Zhou Guiping, Wang Lianqi, and Gao Qiaoming.
Xu Shufen, Wang Zhichao, Wang Yangguang, Xu Kai, Chang Xiongbo, Sun Panpan, Wang Xinghong, Ren Yuan, Ning Yelie.
This document was first published in.2006, and this is its first revision.
Introduction
Testing methods are an important means of verifying the performance of a product. Different testing methods may yield different test results. Therefore, it is essential to develop testing methods.
The purpose of legal standards is to achieve one standard, one inspection, and industry-wide acceptance. Tractors, as the power source for mobile agricultural machinery, operate in a specific environment...
The environment is harsh and involves many requirements regarding personal safety and environmental hygiene, necessitating a series of testing methods to determine whether its performance meets the requirements.
Testing is required. In this regard, my country has established a complete set of tractor testing methods by studying and referencing international standards and advanced foreign standards.
The standard GB/T 3871 aims to establish test procedures for verifying the performance indicators of tractors, and is proposed to consist of 22 parts.
---Part 1.General Requirements. The purpose is to standardize the general requirements and procedures for acceptance, break-in, and testing of agricultural tractor prototypes.
Report writing format.
---Part 2.Measurement of Overall Machine Parameters. The purpose is to standardize the test procedures for measuring the overall machine parameters of agricultural tractors.
---Part 3.Power Take-Off Shaft Power Test. The purpose is to standardize the test procedure for the effective power of the power take-off shaft in agricultural tractors.
---Part 4.Lifting Capacity of Rear Three-Point Suspension System. The purpose is to standardize the lower suspension point of the three-point suspension system on agricultural tractors.
Test procedures for maximum lifting force, maximum lifting force on the frame, lifting time and static settlement.
---Part 5.Steering Circle and Through Circle Diameter. The purpose is to standardize the measurement of the steering circle and through circle diameters for agricultural wheeled tractors.
program.
---Part 6.Determination of Braking Performance of Agricultural and Forestry Vehicles. The purpose is to standardize the braking performance of agricultural tractors, self-propelled agricultural vehicles, and trailers.
Test procedures for braking performance of traction agricultural machinery.
---Part 7.Driver's Forward Visibility. The purpose is to standardize the general requirements, test procedures, and verification methods for the driver's forward visibility on agricultural tractors.
Collection criteria.
---Part 8.Noise Measurement. The aim is to standardize noise levels at the driver's operating position and dynamic environmental noise in agricultural and forestry tractors.
The experimental procedure for sound.
---Part 9.Traction Power Test. The purpose is to standardize the testing procedures for the traction power of agricultural tractors.
---Part 10.Low Temperature Starting. The purpose is to standardize the test procedures for the low temperature starting performance of agricultural tractors.
---Part 11.High-Temperature Performance Testing. The purpose is to standardize the testing procedures for the adaptability of agricultural tractors to high-temperature environments.
---Part 12.Usage Testing. The purpose is to standardize the usage testing of agricultural tractors under actual operating conditions.
program.
---Part 13.Exhaust Smoke Measurement. The purpose is to standardize the testing of exhaust smoke opacity of agricultural tractor engines at stable speeds.
Verification procedure.
---Part 14.Partial Power Output Shaft for Non-Mechanical Transmission. The purpose is to standardize non-mechanical connections in agricultural tractors.
Test procedure for the power output system of the tractor.
---Part 15.Center of Gravity. The purpose is to standardize the test procedures for measuring the center of gravity position of agricultural tractors.
---Part 16.Shaft Power Measurement. The purpose is to standardize the test procedures for measuring the shaft power of agricultural tractors with one or two drive shafts.
Verification procedure.
---Part 17.Engine Air Filters. The purpose is to standardize the testing procedures for engine air filters used in agricultural tractors.
---Part 18.Hydraulic Power at the Tractor-Implement Interface. The purpose is to standardize the external hydraulic power at the connection between agricultural tractors and implements.
Test procedures for hydraulic pressure and hydraulic power on the output device.
---Part 19.Steering Performance of Wheeled Tractors. The purpose is to standardize the steering performance of agricultural wheeled tractors with at least two axles in normal and...
Test procedures for turning in emergency situations.
---Part 20.Bump Test. The purpose is to standardize the test procedures for bump tests on agricultural tractors.
---Part 21.Stability. The purpose is to standardize the test procedures for the longitudinal and lateral stability of wheeled tractors on ramps.
---Part 22.Driver's Side and Rear View. The purpose is to standardize the driver's side and rear view for agricultural tractors.
Requirements, test procedures, and acceptance criteria.
Among various performance indicators, the center of gravity position has a significant impact on the stability and safety of the tractor during driving and operation. Accurate measurement of tractor weight...
The location of the tractor's center of gravity serves two purposes. firstly, it provides a basis for tractor design, allowing for proper weight distribution and preventing instability caused by an excessively high or offset center of gravity; and secondly, it provides a basis for tractor design, enabling the rational allocation of weight and preventing instability caused by an excessively high or offset center of gravity.
On the one hand, this phenomenon helps technicians assess the stability of the aircraft in complex terrain and different operating conditions, thus reducing the risk of accidents.
Agricultural Tractor Testing Procedures
Part 15.Center of Mass
1 Scope
This document specifies the test procedure for determining the position of the center of gravity of an agricultural tractor, and provides a method for determining the horizontal longitudinal coordinate and horizontal transverse coordinate of the center of gravity.
Methods for determining the perpendicular coordinates of the centroid. three methods.
This document applies to agricultural wheeled and tracked tractors.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 6960.1 Tractor Terminology Part 1.Complete Machine
NY/T 1877 Determination of the Center of Gravity Position of Wheeled Tractors by Mass Cycle Method
3 Terms and Definitions
The terms and definitions defined in GB/T 6960.1 apply to this document.
4.Test Equipment
4.1 General Equipment
The general testing equipment is as follows.
a) Weighbridge or force gauge;
b) Flatbed with blade-shaped support (applicable to tracked tractor testing);
c) Dimension measuring instrument;
d) Angle measuring instrument;
e) Tire pressure gauge;
f) Anemometer (for outdoor testing).
4.2 Specialized Equipment
4.2.1 Tilting Method
The specialized equipment for the tilting method is as follows.
a) Level;
b) Plumb bob;
c) Right angle ruler;
d) Lifting equipment;
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GB/T 3871.15-2025: Agricultural tractors - Test procedures - Part 15: Centre of gravity
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