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Ref. No.: IS0 / R 500 - 1966 (E)
IS0
I NT E RN AT IO NA L O RG A N IZAT I O N FOR STA N DARD IZ AT I O N
IS0 RECOMMENDATION
R 500
POWER TAKE-OFF AND DRAWBAR
FOR AGRICULTURAL TRACTORS
1st EDITION
September 1966
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organkations.
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BRIEF HISTORY
The IS0 Recommendation R 500, Power Take-of and Drawbar .for Agricultural
Tractors, was drawn up by Technical Committee ISO/TC 22, Automobiles (Section
ISO/TC 22 (T) -Agricultural Tractors), the Secretariat of which is held by the Association
Française de Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1952 and led, in 1961,
to the adoption of a Draft IS0 Recommendation.
In May 1962, this Draft IS0 Recommendation (No. 503) was circulated to all the
IS0 Member Bodies for enquiry. It was approved, subject to a few modifications of an
editorial nature, by the following Member Bodies :
Australia Greece Romania
Austria Ireland Spain
Belgium Italy Sweden
Chile Japan Switzerland
Czechoslovakia Netherlands United Kingdom
France New Zealand Yugoslavia
Germany Portugal
Four Member Bodies opposed the approval of the Draft:
Canada
Poland
U.S.A.
U.S.S.R.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in September 1966, to accept it as an IS0 RECOMMENDATION.
TABLE OF CONTENTS
Page
3
1. Purpose. .
2.Scope . 3
3. Power take-off . 3
4
3.1 Dimensions .
3.2 Speed of rotation . 4
4
3.3 Direction of rotation .
5
3.4 Location .
4. Clearance round the power take-off. Location of the drawbar in relation to the power
take-off .
5. Drawbar .
6. Power take-off master guard .
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4
IS0 / R 500 - 1966 (E)
September 1966
IS0 Recommendation R 500
POWER TAKE-OFF AND DRAWBAR
FOR AGRICULTURAL TRACTORS
1. PURPOSE
This IS0 Recommendation deals with international standardization of the main power take-off
on agricultural tractors. The recommended type of shaft is the splined shaft of 35 mm for which
the following characteristics are specified :
- dimensions,
- speed of rotation,
- direction of rotation,
- height above the ground,
- distance to the mid-plane.
Further, this IS0 Recommendation also relates to
- the clearance round the power take-off,
- location of the drawbar in relation to the power take-off,
- certain dimensional characteristics for the drawbar,
- the power take-off master guard.
2. SCOPE
The requirements recommended for 35 mm power take-off shafts apply to agricultural tractors.
They do not apply to single-axle tractors, known as motor-cultivators.
The 35 mm (1 in) shaft is recommended for powers up to 45 hp * at the power take-off, at the
standard power take-off speed of rotation (540 r.p.m. (revolutions per minute)).
The indications relating to the positions of the power take-off and the drawbar, and the specifica-
tions relating to the drawbar, apply to all tractors, but not to single-axle tractors, known as
motor-cultivators.
3. POWER TAKE-OFF
The recommended specifications for the main power take-off on agricultural tractors deal with
dimensions, speed and direction of rotation and location.
* 1 hp = 0.146 kW.
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IS0 / R 500 - 1966 (E)
3.1 Dimensions
Figure 1 below shows the recommended dimensions (') for the power take-off on agri-
cultural tractors.
r= 0.7
w
Dimensions in millimetres
Enlarged view of spline
(with inch equivalents)
General dimensions Spline on shaft Spline on hub
I
-
I - -
-
I
mm in
__
1.373 max. 34.93 1.375
Nominal diameter 1.380 D max. 34.87
min. 34.82 1.366 min. 34.90 1.374
E Pinhole diameter 0.327
(shaft and hub)
Diameter of correspond-
1.108 max. 29.72 1.170
n max. 28.14
0.31 1
ing pin
min. 27.89 1 .O98 min. 29.67 1.168
Chamfer length 0.275
B
G Side radius 0.264
1.160 W max. 8.64 0.340 max. 8.74 0.344
F Groove bottom diameter
1.155 min. 8.59 0.338 min. 8.69 0.342
-
-
* Quenched Rockwell C.
** Effective portion of the spline.
*** The spherical space of radius R = 83 mm should remain clear; no fixed part of the tractor should lie within this
sphere of centre O. The shaft may
...