ISO 789-9:2018
ISO · 2018-02-01

Agricultural tractors - Test procedures - Part 9: Power tests for drawbar

试验 ICS 65.060.10 Cited by 2

1Key Takeaways

This document specifies test procedures for determining the power available at the drawbar on agricultural tractors of the wheeled, track-laying or semi-track-laying type.

2Expert Interpretation

This article comprehensively interprets the ISO 789-9:2018 international standard for testing traction power for agricultural tractors, covering key technical requirements such as test procedures, measurement accuracy, and fuel consumption assessment. It also provides special testing solutions and implementation recommendations for CVT transmissions.

ISO 789-9:2018, the international standard for testing the traction power of agricultural tractors, primarily applies to wheeled, tracked, and semi-tracked tractors. The standard requires that during testing, the tractor must meet the manufacturer's technical specifications, and the tire tread height must remain at least 65% of that of a new tire (see Appendix A for measurement methods).

Comparison of key technical indicators

Measurement parameters Allowable error Test conditions
Engine speed ±0.5% Full throttle state
Traction ±1% Horizontal test road surface
Slip rate ≤15% Dry concrete/asphalt road surface
Fuel consumption rate ±1% 7.5km/h Calibrated Speed

Special Test Requirements for CVT Transmissions

For tractors equipped with continuously variable transmissions (CVTs), the standard stipulates that traction power testing must be conducted at six speed points: 5, 7.5, 9, 11, 13, and 16 km/h. Notes during testing:

  • Basic testing should preferably be completed in manual mode.
  • Test results in automatic mode must be recorded separately.
  • Test speed deviation must not exceed ±2% of the calibrated value.

Typical example: A certain brand of 200-horsepower CVT tractor tested at 7.5 km/h showed an 8.3% improvement in fuel efficiency in automatic mode compared to manual mode.

Standard Evolution and Implementation Recommendations

Main updates to this version of the standard (2018) include:

  1. Integration of the 1990 version and the 1993 amendment
  2. Maintaining technical coordination with OECD Code 2:2017
  3. Added a new clause for handling DPF regeneration conditions

Implementation Recommendations:

  • The tractor must be run-in for at least 50 hours before testing
  • The fuel temperature should simulate the operating conditions after 2 hours of full load operation
  • Equipment with DPF must complete regeneration before testing

3Version History

ISO 789-9:1990 older 1990-10
ISO 789-9:1990/Amd 1:1993 Amd 1/1993 older 1993-01
ISO 789-9:2018 2018-02-01

4Standard Metadata

Standard Number
ISO 789-9:2018
Status
Current (70% confidence)
Publisher
International Organization for Standardization (ISO)
Type
试验
Publication Date
2018-02-01
ICS Classification
65.060.10 (Agricultural tractors and trailed vehicles) 
Adopted Standard
BS ISO 789-9-2018,IDT

5Citation Network

2
Cite this standard
2
Referenced herein
Standards that cite ISO 789-9:2018
Agricultural tractors - Test procedures - Part 1: Power tests for power take-off Agricultural tractors - Test procedures - Part 13: Vocabulary and specimen test report
Referenced by ISO 789-9:2018
ISO 789-13:2018 ISO 789-1:2018

6Frequently Asked Questions

What is ISO 789-9:2018?
ISO 789-9:2018 — Agricultural tractors - Test procedures - Part 9: Power tests for drawbar is an international standard developed by International Organization for Standardization (ISO). This document specifies test procedures for determining the power available at the drawbar on agricultural tractors of the wheeled, track-laying or semi-track-laying type.
What does ISO 789-9:2018 cover?
This standard covers: This document specifies test procedures for determining the power available at the drawbar on agricultural tractors of the wheeled, track-laying or semi-track-laying type.
Who should use this standard?
This standard is intended for organizations, professionals, and stakeholders involved in various industries and sectors. It is applicable to manufacturers, service providers, regulatory bodies, and certification organizations.
What is the latest version of ISO 789-9:2018?
The current published version is ISO 789-9:2018, published on 2018-02-01. Always check for amendments or pending revisions.
How do I purchase ISO 789-9:2018?
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