GB/T 3871.4-2025Agricultural tractors - Test procedures - Part 4: Rear three-point linkage lifting capacity (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is Part 4 of GB/T 3871 "Test procedures for agricultural tractors". GB/T 3871 has been published in the following parts.

--- Part 1: General requirements;

--- Part 2: Measurement of whole machine parameters;

--- Part 3: Power take-off shaft power test;

--- Part 4: Lifting capacity of rear three-point hitch;

--- Part 5: Turning circle and passing circle diameter;

--- Part 6: Determination of braking performance of agricultural and forestry vehicles;

--- Part 7: Driver's front field of view;

--- Part 8: Noise measurement;

--- Part 9: Traction power test;

--- Part 10: Low temperature starting;

--- Part 11: High temperature performance test;

--- Part 12: Operational test;

--- Part 13: Exhaust smoke measurement;

--- Part 14: Power take-off shafts for partial power output without mechanical transmission;

--- Part 15: Center of mass;

--- Part 16: Determination of shaft power;

--- Part 17: Engine air filters;

--- Part 18: Hydraulic power at the interface between tractor and implement;

--- Part 19: Steering performance of wheeled tractors;

--- Part 20: Bump test;

--- Part 21: Stability.

This document replaces GB/T 3871.4-2006 "Agricultural tractor test procedures Part 4: Rear three-point hitch lifting capacity".

Compared with GB/T 3871.4-2006, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) The scope has been changed (see Chapter 1, Chapter 1 of the 2006 edition);

b) Added the requirements for test prototypes (see 5.1);

c) Added the requirements for instruction manual (see 5.3);

d) Added maintenance requirements (see 5.4);

e) Added technical specification requirements (see 5.5);

f) Added the requirements for atmospheric pressure of environmental conditions (see 5.7.1);

g) The general requirements for the test procedure have been changed (see 6.1, 6.1.1 of the 2006 edition);

h) The lifting force of the lower suspension point has been changed (see 6.2, 6.1.2 of the 2006 edition);

i) The lifting force on the frame has been changed (see 6.3, 6.1.3 of the 2006 edition);

j) Added the method for determining the lifting time (see 6.4);

k) The requirements for static settlement test have been changed (see 6.4, 6.2 of the 2006 edition);

l) The test report requirements have been changed (see Chapter 7, 6.1.4 and 6.2.5 of the 2006 edition);

m) The test report format has been changed (see Appendix A of the 2006 edition).

This document is modified to adopt ISO 789-2:2018 "Agricultural tractor test procedures Part 2: Rear three-point hitch lifting device ability".

This document has the following structural adjustments compared to ISO 789-2:2008.

--- Added normative Appendix A.

The technical differences between this document and ISO 789-2:2018 and their reasons are as follows.

a) The scope (see Chapter 1) has been changed to meet the needs of domestic industry;

b) The terms and definitions (see Chapter 3) have been changed to meet the needs of this document;

c) The pressure unit has been changed (see Chapter 4) to be consistent with GB/T 3871.18;

d) The normative reference GB/T 1593 replaces ISO 730:2009 (see Chapters 5 and 6) to facilitate the use of the standard;

e) The requirements for running-in and commissioning (see 5.2) have been modified to adapt to the technical characteristics of products currently on the market and to ensure the repeatability of the test. Renaturation;

f) The requirements of the technical specifications (see 5.5) have been changed to maintain consistency in the content of the technical specifications;

g) The normative reference GB/T 3141 replaces ISO 3448:1992 (see 5.6.1) to facilitate the use of the standard;

h) The maximum performance in the general requirements (see 6.1 of ISO 789-2:2018) has been deleted to avoid ambiguity;

i) The adjustment requirements (see 6.1.2) have been changed to meet the test needs;

j) The lifting force of the lower suspension point has been changed (see 6.2) to meet the needs of domestic industry use;

k) The lifting force on the frame has been changed (see 6.3) to meet the needs of domestic industry;

l) The lifting time determination and static settlement test methods (see 6.4) have been added to meet the needs of domestic industry use;

m) The test report requirements (see Chapter 7) have been changed to unify the standards for ease of use;

n) Added the test report format (see Appendix A) to unify the standards for ease of use.

The following minimal editorial changes have been made to this document.

--- Change the name of the standard to "Agricultural tractor test procedures Part 4: Rear three-point hitch lifting capacity" to make it consistent with the current Some standardized documents are coordinated.

Introduction

The test method is an important means to test the performance of products. Different test methods can produce different test results.

The purpose of the standard is to achieve a standard, a single test, and industry-wide recognition. As the power source of mobile agricultural machinery, tractors have a harsh working environment.

It is poor and involves many requirements in terms of personal safety and environmental hygiene, so a series of test methods are needed to check whether its performance meets the requirements.

In this regard, my country has established a complete set of tractor test methods by studying and referring to international standards and foreign advanced standards.

GB/T 3871 aims to establish test procedures for inspecting tractor performance indicators and is intended to consist of 22 parts.

--- Part 1: General requirements. The purpose is to standardize the acceptance, running-in, test general requirements and test Report writing format.

--- Part 2: Measurement of complete machine parameters. The purpose is to standardize the test procedures for measuring complete 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 of agricultural tractors.

--- Part 4: Lifting capacity of rear three-point hitch. The purpose is to standardize the lifting capacity of the lower suspension point of the three-point hitch of agricultural tractors. Test procedures for maximum lifting force, maximum lifting force on the frame, lifting time and static settlement.

--- Part 5: Turning circle and passing circle diameter. The purpose is to standardize the measurement of turning circle and passing circle diameter of agricultural wheeled tractors program.

--- Part 6: Determination of braking performance of agricultural and forestry vehicles. The purpose is to standardize agricultural tractors and self-propelled agricultural vehicles and trailers and test procedures for braking performance of trailed agricultural machinery.

--- Part 7: Driver's front field of view. The purpose is to standardize the general requirements, test procedures and verification of the driver's front field of view of agricultural tractors. Collection criteria.

--- Part 8: Noise measurement. The purpose is to standardize the noise at the driver's operating position and dynamic environmental noise of agricultural and forestry tractors. Sound test procedures.

--- Part 9: Traction power test. The purpose is to standardize the test procedure for the traction power of agricultural tractors.

--- Part 10: Low temperature starting. The purpose is to standardize the test procedure for the low temperature starting performance of agricultural tractors.

--- Part 11: High temperature performance test. The purpose is to standardize the test procedures for the adaptability of agricultural tractors to use in high temperature environments.

--- Part 12: Operational test. The purpose is to standardize the operation test of agricultural tractors under actual conditions of use. program.

--- Part 13: Exhaust smoke measurement. The purpose is to standardize the test of exhaust smoke density of agricultural tractor engines at steady speed. Verification procedures.

--- Part 14: Non-mechanical transmission of partial power output power take-off shaft. The purpose is to standardize the non-mechanical connection of agricultural tractors Test procedure for the power take-off system of a tractor.

--- Part 15: Centre of mass. The purpose is to standardize the test procedure for measuring the centre of mass position of agricultural tractors.

--- Part 16: Determination of shaft power. The purpose is to standardize the test method for determining the shaft power of agricultural tractors with one or two drive shafts. Verification procedures.

--- Part 17: Engine air filters. The purpose is to standardize the test procedures for engine air filters for agricultural tractors.

--- Part 18: Hydraulic power at the interface between tractors and implements. The purpose is to standardize the external hydraulic power at the interface between agricultural tractors and implements. Test procedures for hydraulic pressure and hydraulic power on output devices.

--- Part 19: Steering performance of wheeled tractors. The purpose is to specify the steering performance of agricultural wheeled tractors with at least two axles in normal and Test procedures for steering conditions in emergency situations.

--- Part 20: Bump test. The purpose is to standardize the test procedure for the bump test of agricultural tractors.

--- Part 21: Stability. The purpose is to specify the test procedures for the longitudinal and lateral stability of wheeled tractors on ramps.

--- Part 22: Driver's side and rear vision. The purpose is to standardize the general side and rear vision of agricultural tractors. Requirements, test procedures and acceptance criteria.

The lifting capacity of the rear three-point hitch is an important performance indicator of the tractor. The test results of the lifting force of the lower hitch point and the lifting force on the frame are as follows.

It can be used as a reference indicator for selecting supporting agricultural implements. The lifting time and static settlement test can reflect the response speed and stability of the tractor lifting system. Qualitative.

1 Scope

This document specifies the determination of the maximum lifting force at the lower suspension point, the maximum lifting force on the frame, and the lifting force at the rear three-point hitch of an agricultural tractor. Test procedure for time and static settlement.

This document applies to wheeled and tracked agricultural tractors.

Note: This document also applies to front three-point hitch systems.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document.

GB/T 1593 Rear-mounted three-point hitch for agricultural wheeled tractors, categories 0, 1N, 1, 2N, 2, 3N, 3, 4N and 4 (GB/T 1593-2015, ISO 730:2009, MOD)

GB/T 3141 Industrial liquid lubricants - ISO viscosity classification (GB/T 3141-1994, ISO 3448:1992, eqv)

GB/T 6960.1 Tractor terminology Part 1: Complete machine

3 Terms and Definitions

The terms and definitions defined in GB/T 6960.1 and the following apply to this document.

4 Measurement units and errors

This document uses the following measurement units and tolerances.

a) Speed. The unit is revolutions per minute (r/min), with an allowable error of ±0.5%;

b) Time. The unit is second (s), with an allowable error of ±0.2s;

c) Distance. The unit is meter or millimeter (m or mm), with an allowable error of ±0.5%;

d) Force. The unit is Newton (N), with an allowable error of ±1%;

e) Mass. The unit is kilogram (kg), with an allowable error of ±0.5%;