ISO INTERNATIONAL STANDARD 4253 Secondedition 1993-09-15 Agricultural tractors - Operator's seating accommodation - Dimensions Tracteurs agricoles -Poste de conduite pour conducteur assis - Dimensions ISO Reference number ISO42531993(E) ISO4253:1993(E) 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)onall mattersof electrotechnical standardization. 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. Interriational StandardISO4253wasprepared byTechnicalCommittee ISO/TC23 3, Tractors and machinery for agriculture and forestry,Sub- Committee Sc 3, Safety and comfort of the operator. This second edition cancels and replaces the first edition (sO 4253:1977),of which it constitutes a full revision and extension. ISO 1993 All rights reserved No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without per- mission in writing from the publisher International OrganizationforStandardization Case Postale 56.CH-1211Geneve 20·Switzerland Printed in Switzerland ISO 4253:1993(E) INTERNATIONAL STANDARD Agricultural tractors Operator's seating accommodation Dimensions 1 Scope centreline) to the vertical transverse plane containing the seat index point. This International Standard lays down dimensions for the operator's seat and the location of specific con- 3.2 width of seat cushion: Width measured along trols relative to the Seat Index Point (SiP) within the the transverse plane through the seat index point. seating accommodation on agricultural tractors with a track width greater than 1 150 mm. The controls 3.3 pedal(s): Any or all of the clutch, brake and included are the steering-wheel, clutch pedal, brake throttie pedals. pedal(s), and throttle pedal. Standardized dimensions and locations will assist the 4Adjustment of pedals and future design of operator's seating accommodation on agricuitural tractors. steering-wheel The pedals shail be adjusted in accordance with the manufacturer's instructions. Measurements of the pedal position shall be made before any force is ap- 2 Normative reference plied to move the pedals. The following standard contains provisions which, The measurement point of a pedai is where the through reference in this text, constitute provisions longitudinal and transverse centrelines of the pedal of this International Standard. At the time of publi- tread surface intersect. cation, the edition indicated was valid. All standards are subject to revision, and parties to agreements The measurement point for the steering-wheel is the based on this International Standard are encouraged point where the centreline through the steering-wheel to investigate the possibility of applying the most re- axis intersects with the upper plane of the steering- cent edition of the standard indicated below. Mem- wheel rim. bers of IEC and isO maintain registers of currently valid International Standards. 5 Lateral arrangement of pedals IsO5353:1978,Earth-movingmachinery,and tractors and machinery for agriculture and forestry - Seat The pedals shall be placed in the following order from index point. the ieft-hand side to the right-hand side: ciutch (oper- ated by the left foot), brake(s) (operated by the right foot) and, if installed, the foot throttle (operated by the right foot). 3 Definitions NOTE1 This arrang