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GB/T 3871.7-2025: Agricultural tractors - Test procedures - Part 7: Operator field of vision to the front
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 3871.7-2025	English	279	Add to Cart	3 days [Need to translate]	Agricultural tractors - Test procedures - Part 7: Operator field of vision to the front
GB/T 3871.7-2006	English	259	Add to Cart	3 days [Need to translate]	Agricultural tractors -- Test procedures -- Part 7: Operator field of vision
GB/T 3871.7-1993	English	199	Add to Cart	2 days [Need to translate]	Test methods for agricultural wheeled and tracklaying tractors. Part 7: Measurements of operatorfield vision

GB/T 3871.7-2025: Agricultural tractors - Test procedures - Part 7: Operator field of vision to the front

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ICS 65.060.10 CCST61 National Standards of the People's Republic of China Replaces GB/T 3871.7-2006 Agricultural Tractor Testing Procedures Part 7.Driver's Forward Visibility Released on October 31, 2025; to be implemented on May 1, 2026. State Administration for Market Regulation The State Administration for Standardization issued a statement.

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 7 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 supersedes GB/T 3871.7-2006 "Test Procedures for Agricultural Tractors Part 7.Driver's Visibility". This document is consistent with... Compared with GB/T 3871.7-2006, apart from structural adjustments and editorial changes, the main technical changes are as follows. a) The standard range has been changed to "driver's forward field of vision" (see Chapter 1, Chapter 1 of the.2006 edition); b) Terms and definitions have been changed (see Chapter 3, Chapter 3 of the.2006 edition); c) The requirements for viewpoint location have been changed (see 4.2, Chapter 5 of the.2006 edition); d) General requirements and acceptance criteria were added (see 5.1 and 5.3), and the term "Test Procedure" was changed to "Test Specification" (see 5.2,.2006). Version 6.4); e) The requirements for test sites, test equipment, and tractors in the practical testing methods have been removed (see 6.1, 6.2, and 6.3 of the.2006 edition); In addition to the experimental procedures for the posterior and superior visual field angles (see 6.4.1 and 6.4.2 in the.2006 edition), the field of view was expanded. Verification (see 5.2.1); f) The mathematical calculation method for occlusion shadows in binocular vision has been modified (see 5.2.2, Chapter 7 of the.2006 edition); g) Additional testing and equivalent procedures have been added (see 5.2.3 and 5.2.4); h) The test report requirements have been revised, and the field of view angle has been removed (see Chapter 6, Chapter 8 of the.2006 edition); i) The requirements for the summary table of visual field measurement results have been changed (see Appendix A, Appendix A of the.2006 edition). This document is modified to adopt ISO 5721-1.2013 "General requirements, test procedures and acceptance criteria for driver's visibility of agricultural tractors". Part 1.Forward Visual Field. Compared with ISO 5721-1.2013, this document has undergone the following structural adjustments. a) The order of terms in Chapter 3 has been adjusted; 3.2, 3.3, 3.4, 3.5, and 3.9 now correspond to 3.1.1, 3.2, 3.3, 3.4, 3.5, and 3.9 in ISO 5721-1.2013, respectively. 3.1.2, 3.2, 3.4, 3.8; b) The order of Figures 1 and 2 has been adjusted. Figures 1 and 2 correspond to Figures 2 and 1 in ISO 5721-1.2013, respectively. The technical differences between this document and ISO 5721-1.2013, and the reasons therefor, are as follows. a) Added normative reference GB/T 6960.1 (see Chapter 3) to improve the standard's usability; b) Change the terms and definitions of “forward field of view (top) sector” and “forward field of view (ground) sector” to “forward field of view sector” (see 3.6) Meets the requirements for using this document; c) The terminology and definition of "viewpoint location" have been added (see 3.8) to meet the requirements of this document; d) ISO 5353 (see 4.2) has been replaced with the normatively referenced GB/T 6236, increasing operability; e) ISO 5006 (see 5.1.5) has been replaced with the normatively referenced GB/T 16937 to adapt to my country's technical conditions and increase operability. Acting. The following editorial changes have been made to this document. ---The standard name has been changed; ---A test report format has been added (see Appendix A). 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. First Tractor Co., Ltd., Jiangsu Coastal Agricultural Machinery Testing Co., Ltd., and the Ministry of Agriculture and Rural Affairs. Mechanization General Station, Luoyang Xiyuan Vehicle and Power Inspection Institute Co., Ltd., and Luoyang Tractor Research Institute Co., Ltd. The main drafters of this document are. Yang Yin, Xu Juan, Peng Peng, Jia Fang, Chen Song, Guo Hui, Ruan Wencheng, Li Bo, and Guo Ruiyu. This document was first published in 1983, revised for the first time in.1993, revised for the second time in.2006, and this is the third revision.

Introduction

Testing methods are an important means of verifying the performance of products. Different testing methods yield different test results, and it is essential to develop testing method standards. The goal of this standard is to achieve a single standard, a single inspection, and industry-wide acceptance. Tractors, as the power source for mobile agricultural machinery, operate in harsh environments. Furthermore, since there are many requirements regarding personal safety and environmental hygiene, a series of testing methods are needed to verify whether its performance meets the requirements. 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. This revision of GB/T 3871.7 mainly considers supplementing the passability standards for tractors' forward visibility and introducing new testing technologies, thereby improving the testing... To improve the efficiency and adaptability of standards, better serve technological development, and promote trade, exchange, and technological cooperation. Agricultural Tractor Testing Procedures Part 7.Driver's Forward Visibility

1 Scope

This document specifies the general requirements, test procedures, and acceptance criteria for determining the forward visibility of agricultural tractor drivers. This document applies to agricultural wheeled tractors 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 6236 Driver's Seat Markings for Agricultural and Forestry Tractors and Machinery GB/T 6960.1 Tractor Terminology Part 1.Complete Machine GB/T 16937 Test methods and performance criteria for the visibility of earthmoving machinery drivers

3 Terms and Definitions

The terms and definitions defined in GB/T 6960.1 and the following terms and definitions apply to this document. 3.1 field of vision The range of views from the seated driver's point of view. 3.2 direct field of vision The area of direct visible vision obtained by light emitted from a light source. 3.3 The visible field of view with the aid of mirrors or other visual aids (such as closed-circuit television images). 3.4 On a horizontal surface, draw a semicircle with a radius of 12m, centered on the vertical projection point of the viewpoint. When facing the direction of travel... At that time, the semicircular arc is located directly in front of the tractor, and the boundary line of the semicircle is perpendicular to the longitudinal axis of the tractor, as shown in Figure 1. 3.5 Masking effects Within the semicircle of vision, due to obstructions from structural components such as the roof pillars, air intake pipes, exhaust pipes, and windshield frame, the driver's field of vision is obstructed. The chord length of the forward field of view sector that cannot be seen from the current location. 3.6 The field of vision extends outward from the outer region of the foreground semicircle corresponding to the 9.5m chord length, and the 9.5m chord length on this foreground semicircle is perpendicular to... ...