ISO 789-7:1991 農業用トラクター—テスト手順—パート7：車軸出力の決定 | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75% of the member bodies casting a vote.

International Standard ISO 789-7 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, Sub-Committee SC 2, Common tests.

ISO 789 consists of the following parts, under the general title Agricultural tractors — Test procedures:

• Part 1: Power tests for power take off
• Part 2: Rear three-point linkage lifting capacity
• Part 3: Turning and clearance diameters
• Part 4: Measurement of exhaust smoke
• Part 5: Partial power PTO — Non-mechanically transmitted power
• Part 6: Centre of gravity
• Part 7: Axle power determination
• Part 8: Engine air cleaner
• Part 9: Power tests for drawbar
• Part 10: Measurement of hydraulic power — Tractor/implement interface
• Part 11: Steering capability — Wheeled tractors

Annex A forms an integral part of this part of ISO 789. Annexes B, C, D and E are for information only.

1 Scope

This International Standard specifies test procedures for determining the power available at the axle or axles of wheeled or track-laying agricultural tractors having one or two driven axles.

2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 789. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 789 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.

3 Definitions

For the purposes of this part of ISO 789, the following definitions apply.