GB/T 15370.3-2025Agricultural tractors — General requirement — Part 3: Over 130 kW wheeled tractors (English PDF)

4.1 General requirements

4.1.1 Tractors shall be manufactured in accordance with product drawings and technical

documents approved through the prescribed procedures.

4.1.2 Parts and components connected by fasteners on the tractor shall be securely

connected as required. There shall be no looseness. Exposed fasteners shall be treated with rust prevention.

4.1.3 When the tractor is working normally, there shall be no abnormal noises from any system. There shall be no leakage of fluid, air, or electricity.

4.1.4 When the tractor is working normally, there shall be no mud or water seeping into the machine body.

4.1.5 The appearance quality of the tractor shall comply with the provisions of JB/T 6712.

4.1.6 The engine shall be able to operate stably throughout its entire speed range. It shall be able to stop directly by commanding the fuel cut-off. The hand throttle control shall be able to reliably stop at any position, unaffected by foot throttle operation.

4.1.7 The maximum opacity of tractor exhaust smoke shall not exceed 0.5 m-1.

4.1.8 The operation of all tractor control mechanisms shall be smooth, flexible, and with appropriate tension. The stroke adjustment of each mechanism shall conform to the specifications in the instruction manual. All control mechanisms with automatic return function shall automatically reset after the operating force is removed. Control mechanisms without automatic return function shall reliably stop at the selected position. The maximum operating force of each control mechanism shall conform to GB/T 19407.The direction of operation shall conform to GB/T 20341.

4.1.9 The clutch shall engage smoothly and disengage completely.

4.1.10 When the tractor gearbox is working, the gearbox shall not have any gear shifting failures such as random shifting or disengaging.

4.1.11 The rear-mounted power take-off shaft shall conform to the requirements of

GB/T 1592 (all parts). The front-mounted power take-off shaft shall conform to the requirements of GB/T 10916 (all parts).

4.1.12 The toe-in of the front wheels shall conform to the specifications in the instruction manual. The front drive axle shall conform to GB/T 21958.

4.1.13 When the tractor is parked in a straight-line driving position, the maximum free travel of the steering wheel shall not exceed 25°; the tractor shall be able to steer smoothly throughout the entire range; there shall be no discontinuous operation or impact phenomena. Manual steering shall be possible even if the tractor stalls or the power steering device malfunctions during operation. Steering performance shall comply with the requirements of GB/T 19040.

4.1.14 When a tractor is traveling in a straight line on a hard surface, the front wheels shall not exhibit any visible swaying.

4.1.15 Rear-mounted hydraulic suspension devices shall comply with the provisions of

GB/T 1593.Front-mounted suspension devices shall comply with the provisions of GB/T 10916 (all parts).

4.1.16 Tractor-mounted trailers shall comply with the relevant provisions of GB/T

19408 (all parts). Hydraulic quick-connect couplings shall comply with GB/T 5862.

4.1.17 The fully open pressure of the hydraulic system safety valve shall be consistent with the value specified in the instruction manual.

4.1.18 The electrical equipment of the tractor shall function normally. The electrical

equipment shall comply with the provisions of JB/T 6697.

4.1.19 The tractor's electronic control system shall function normally. The electronic

control system shall have Controller Area Network (CAN) bus communication capabilities. The tractor's power transmission system messages shall comply with GB/T 35381.8 The tractor's control mechanism bus shall comply with GB/T 35381 (all parts).

4.1.20 The electronic control system shall have fault diagnosis function, and the

diagnostic connector shall be a 9-pin connector conforming to GB/T 35381.2 or a 16- pin diagnostic connector conforming to GB/T 34589.

4.1.21 Tractors shall be equipped with at least a device for displaying engine speed, engine coolant temperature, engine operating hours, fuel tank level, engine control system malfunctions, after-treatment regeneration status and after-treatment malfunctions, as well as the status of the on-board terminal. The on-board terminal shall comply with the provisions of HJ 1322.

4.1.22 Tractor headlights shall comply with the provisions of JB/T 6701.LED

headlights shall comply with the provisions of JB/T 13488.

4.1.23 The hydraulic suspension system of the tractor shall be equipped with an

electronic control system.

4.1.24 The electromagnetic compatibility of tractors shall comply with the provisions

of GB/T 21398.

4.1.25 Lighting and lighting signal devices shall comply with the provisions of GB/T

30464.

4.1.26 The dimensions of the tractor cab doorway, emergency exit, and driver's working

position shall conform to the provisions of GB/T 6238.

4.1.27 There shall be no leakage at any sealing surface or pipe joint of the tractor.

4.1.28 Tractors shall be equipped with horns that have a continuous sound output

function. The sound pressure level range shall be 90 dB(A)~115 dB(A).

4.1.29 The air conditioning system for ventilation, cooling and/or heating of the

enclosed cab of a tractor shall comply with the provisions of GB/T 13877.2.Tractors with a power of 220 kW and above shall be equipped with an enclosed cab.

4.1.30 The quality of lubricating oil for tractors shall not be lower than that specified in JB/T 7282.

4.1.31 Components of the tractor's precision transmission and hydraulic system shall

be thoroughly cleaned before assembly. The cleanliness of the hydraulic system and its components shall comply with the requirements of JB/T 12675.

4.1.32 Tractor control symbols shall comply with the provisions of GB/T 4269.1, GB/T

4269.2 and GB/T 20341.

4.1.33 The tractor instruction manual shall comply with the provisions of GB/T 9480.

4.2 Safety and environmental requirements

4.2.1 The safety requirements for tractors shall comply with the provisions of GB

18447.1.

4.2.2 The environmental protection requirements for tractor engines shall comply with

the provisions of GB 20891.

4.2.3 The environmental protection requirements for the tractor as a whole shall comply

with the provisions of HJ 1014.

not exceed 4% of the lifting stroke at the loading point. During the lifting process, the lifting mechanism shall not exhibit vibration, creeping, or abnormal noise. The hydraulic system shall not leak oil or have the safety valve open.

4.3.5.3 The ratio of the tractor's maximum effective hydraulic power to the engine's

rated power (12 h) shall not be less than 12%.

4.3.6 Performance of automated driving assistance systems

The automatic driving assistance system for tractors shall comply with the provisions of GB/T 43478.

4.3.7 Reliability

The mean time between failures (MTBF) for tractor reliability testing shall be no less than 250 h. The overall failure-free performance score shall be no less than 70 points.

5.1 The structure, function, certificate of conformity and inspection report of the tractor

and its parts shall be inspected by visual inspection, measurement with measuring tools or actual operation.

5.2 The mud and water sealing performance of the tractor shall be tested according to the method specified in GB/T 24645.

5.3 The appearance quality of the tractor shall be inspected by visual inspection.

5.4 The performance of the engine fuel supply control mechanism was checked through

actual operation.

5.5 The maximum opacity of tractor exhaust smoke shall be tested according to the method specified in GB/T 3871.13.

5.6 The maximum operating force of each control mechanism shall be checked using

measuring instruments. The operation and direction of control of each control mechanism shall be checked through actual operation.

5.7 The engagement and disengagement function of the main clutch was checked

through actual operation.

5.8 The function of the tractor gearbox is checked through actual operation.

5.9 The steering performance of the tractor shall be tested according to the method specified in GB/T 19040.

5.10 The braking performance of the tractor shall be tested according to the method

5.21 The ventilation, cooling and heating air conditioning system of the tractor's

enclosed cab shall be tested according to the method specified in GB/T 13877.2.

5.22 The cleanliness of the hydraulic system and its components shall be tested

according to the method specified in JB/T 12675.

5.23 Visually inspect tractor control symbols.

5.24 Check the tractor's instruction manual.

5.25 Tractor safety items shall be tested according to the methods specified in GB 18447.1.

5.26 The tractor safety starting device is inspected through actual operation.

5.27 Visually inspect the label on the tractor's engine. The environmental protection

requirements for the entire tractor shall be tested according to the methods specified in HJ 1014.

5.28 The performance of the power take-off shaft shall be tested according to the method specified in GB/T 3871.3.

5.29 Traction performance shall be tested according to the method specified in GB/T

3871.9.

5.30 Starting performance shall be tested according to the method specified in GB/T

3871.10.

5.31 High-temperature performance shall be tested according to the method specified

in GB/T 3871.11.

5.32 The performance of the hydraulic suspension shall be tested according to the

method specified in GB/T 3871.4.

5.33 The hydraulic output power shall be tested according to the method specified in GB/T 3871.18.

5.34 The tractor automatic auxiliary driving system shall be tested according to the

method specified in GB/T 43478.

5.35 Tractor reliability shall be tested according to the methods specified in GB/T

24648.1 or GB/T 35218.

6.1 Exit-factory inspection

6.2 Type inspection

6.2.1 Timing of type inspection

Type inspection shall be conducted under any of the following circumstances.

a) When a newly developed tractor is finalized and approved;

b) When the design is improved after formal production, with significant changes to the structure, principle, and important components;

c) Every 5 years after formal production;

d) When production resumes after a 12-month hiatus;

e) When the exit-factory inspection results differ significantly from the previous type inspection.

6.2.2 Inspection items

6.2.2.1 For tractors falling under the category of 6.2.1 a), type inspection shall include all machine parameter measurements, performance tests, and machine usage tests, or component bench durability tests and machine reliability tests may be used in place of machine usage tests.

If the design falls under the tractor series, all models with different power outputs shall undergo overall parameter measurement and performance testing. The inspection items shall conform to JB/T 6294.Other tests, such as overall machine usage testing and reliability assessment, may be conducted only on the model with the highest power output. Engines installed in other models shall meet the engine reliability requirements.

NOTE 1.Tractor series design refers to the design of a group of tractor models that use the same chassis (transmission system) but have optional other systems. All models use the same series number.

NOTE 2.If the tractor's performance indicators do not change when replacing the engine with a different brand or power, then the test data results of the tractor model with the same series of engines but equipped with other brands or power shall be used.

6.2.2.2 For tractors falling under the category of 6.2.1 b), type inspection shall include full machine performance testing and bench durability testing or overall machine reliability testing of significantly improved components.

6.2.2.3 The type inspection of tractors falling under the conditions c)~e) in 6.2.1 shall be carried out according to the items listed in Table 1.

6.2.3 Non-conformity classification

Any item inspected that does not meet the requirements stipulated in Chapter 4 is considered a nonconformity. Based on the degree of impact on product quality, nonconformities are classified into Category A, Category B, Category C, and Category D. See Table 1 for the nonconformity classifications.

6.2.4 Sampling plan

6.2.4.1 Sampling shall be conducted according to the provisions of Tables B.1 and B.2 in GB/T 2828.11-2008.Generally, the total number of products inspected is 10 units.

The specific sampling plan is shown in Table 2. ......