IS 4931 : Part 3 : 2024/ISO 500-3 : 2014 Agricultural Tractors - Rear-Mounted Power Take-off Types 1, 2, 3 and 4 - Part 3 Main PTO Dimensions and Spline Dimensions, Location of PTO
NATIONAL FOREWORD
This Indian Standard (Part 3) (Fourth Revision) which is identical to ISO 500-3 : 2014 'Agricultural tractors - Rear-mounted power take-off types 1, 2, 3 and 4 - Part 3: Main PTO dimensions and spline dimensions, location of PTO' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Agricultural Machinery and Equipment Sectional Committee and approval of the Food and Agriculture Division Council.
IS 4931 was first published in 1968 and subsequently revised in 1977 and 1984. In the third revision in 1995, the standard was aligned with corresponding ISO standard, ISO 500 :1991 and the tolerance on diameter of shaft profile of Type 1 PTO shaft, requirements of hardness, location of PTO and dimension of master shield were modified. Also, the safety requirements as per IS 12239 (Part 1) : 1988 ' Guide for safety and comfort of operator of agricultural tractors and power tillers Part 1 General requirements' and alternate clearance zone were included.
Subsequently, ISO 500 was revised in 2004 splitting it into three parts under the general title 'Agricultural tractors - Rear-mounted power take-off types 1, 2, and 3'. Further, Part 1 and Part 3 of ISO 500 were revised in 2014 with the modification of the general title as 'Agricultural tractors - Rearmounted power take-off types 1, 2, 3 and 4'. In this fourth revision of IS 4931, the Indian Standard is also being split into three parts as given below:
Part 1 General specifications, safety requirements, dimensions for master shield and clearance zone
Part 2 Narrow-track tractors, dimensions for master shield and clearance zone
Part 3 Main PTO dimensions and spline dimensions, location of PTO
The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'; and
b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.