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THE COMMISSION OF THE EUROPEAN COMMUNITIES,
Having regard to the Treaty establishing the European Economic Community,
Having regard to Council Directive 74/ 150/EEC of 4 March 1974 on the approximation of the laws of the Member States relating to the type-approval of wheeled agricultural or forestry tractors(1), as last amended by Directive 79/694/EEC(2), and by the Act of Accession of Greece, and in particular Article 11 thereof,
Having regard to Council Directive 78/764/EEC of 25 July 1978 on the approximation of the laws of the Member States relating to the driver's seat on wheeled agricultural or forestry tractors(3),
Whereas experience gained and the current state of the art now make it possible to supplement certain requirements and bring them more into line with actual test conditions; whereas it has proved necessary to amend the wording of certain items in some language versions so as to ensure alignment with the other language versions;
Whereas this first set of amendments may be followed by others concerning, initially, a procedure for the inspection of the driver's seat on tractors whose mass exceeds 5 tonnes, in particular by means of test-stand examinations and, subsequently, as soon as technical conditions so permit, the replacement of track tests by test-stand inspections and, if possible, of test personnel by mechanical devices (for example, dummies);
Whereas the measures provided for in this Directive are in accordance with the opinion of the Committee for the Adaptation to Technical Progress of the Directives on the Elimination of Technical Barriers to Trade in Agricultural or Forestry Tractors,
HAS ADOPTED THIS DIRECTIVE:
Annexes I, 11 and IV to Directive 78/764/EEC are hereby amended in accordance with the Annex to this Directive.
1.With effect from 1 October 1983, no Member State may:
refuse to grant EEC type-approval, to issue the document referred to in the last indent of Article 10 (1) of Directive 74/150/EEC or to grant national type-approval in respect of a type of tractor, or
prohibit the entry into service of tractors,
if the driver's seat of this type of tractor or of these tractors complies with the provisions of this Directive.
2.With effect from 1 October 1984, Member States:
shall no longer issue the document referred to in the last indent of Article 10 (1) of Directive 74/150/EEC in respect of a type of tractor in which the driver's seat does not comply with the provisions of this Directive,
may refuse to grant national type-approval in respect of a type of tractor in which the driver's seat does not comply with the provisions of the present Directive.
Member States shall bring into force the provisions necessary to comply with this Directive by 30 September 1983 at the latest. They shall forthwith inform the Commission thereof.
This Directive is addressed to the Member States.
Annex I to Directive 78/764/EEC is hereby amended as follows:
Item 9 shall be replaced by the following:
“Suspension travel” means the vertical distance between the highest position and the position at a given moment of a point situated on the seat surface 200 mm in front of the seat reference point in the median longitudinal plane.’
Item 10: The English version shall remain unchanged.
Item 13 shall be deleted.
Item 14 shall become Item 13,and the following definitions shall be added:
=
rms value of the weighted seat vibration acceleration measured during a bench test or a standard roadway test;
=
rms value of the weighted vibration acceleration measured at the seat attachment during a bench test;
=
rms value of the weighted vibration acceleration measured at the seat attachment during a standard roadway test.’
Item 15 shall become Item 14. The English version shall remain unchanged.
Item 16 shall become Item 15.
Item 17 shall become Item 16 and shall be replaced by the following:
“Category A tractor” means a tractor which can be assigned to a given vibration class by reason of similar design features.’
Items 17.1 and 17.2 shall become Items 16.1 and 16.2 respectively.
Item 18 shall be deleted, together with its sub-items.
Item 19 shall become Item 17 and shall be replaced by the following:
“Category B tractor” means a tractor which cannot be assigned to a vibration class in Category A.’
Item 20 shall become Item 18 and its sub-items shall become sub-Items 18.1, 18.2, 18.3 and 18.4.
Annex II to Directive 78/764/EEC is hereby amended as follows:
Item 1.3.1. The English version shall remain unchanged.
Item 1.6.2. In the last line ‘+ 0,1 bar’ shall be replaced by ‘± 0,1 bar’ in all language versions except the Danish.
1.7.1. The English version shall remain unchanged.
1.7.2. The English version shall remain unchaged.
Item 1.7.3 shall be replaced by the following:
After Item 1.7.3, the following new item shall be added:
Item 1.8: In the English version only, the repetition of the words ‘locked in a position’ shall be deleted.
Item 2.1.3: The English version only shall be replaced by the following:
Item 2.4.1: The English version only shall be replaced by the following:
150 mm for tractors with a minimum rear-wheel track width of more than 1 150 mm,
60 mm for tractors with a minimum rear-wheel track width of 1 150 mm or less.’
Item 2.4.2: The English version only shall be replaced by the following:
60 mm for tractors with a minimum rear-wheel track width of more than 1 150 mm,
30 mm for tractors with a minimum rear-wheel track width of 1 150 mm or less.’
Item 2.5.1 shall be replaced by the following:
Item 2.5.1.1 shall be replaced by the following:
Item 2.5.1.2: The second sentence shall be replaced by the following:
‘The measuring error for the suspension travel shall not exceed ± 1 mm.’
Item 2.5.1.3 shall be replaced by the following:
Items 2.5.1.4, 2.5.1.4.1 and 2.5.1.4.2 shall be replaced the following:
Items 2.5.1.4.3 and 2.5.1.4.4 shall be deleted.
[X1Item 2.5.1.5: In the Danish and French versions only, an adjective corresponding to ‘ full ’ shall be inserted to qualify the word corresponding to ‘ travel ’ .
Editorial Information
X1 Substituted by Corrigendum to Commission Directive 83/190/EEC of 28 March 1983 adapting to technical progress Council Directive 78/764/EEC on the approximation of the laws of the Member States relating to the driver's seat on wheeled agricultural or forestry tractors (Official Journal of the European Communities L 109 of 26 April 1983).
Item 2.5.1.6: The words ‘ in the mean position of the suspension system ’ shall be inserted after the word ‘ load ’ .
Item 2.5.1.7 shall be replaced by the following:]
Item 2.5.2 shall be replaced by the following:
‘2.5.2.Determination of lateral stability’
Item 2.5.2.1 shall be replaced by the following:
Item 2.5.3 shall be replaced by the following:
‘2.5.3.Determination of the vertical vibration characteristics’
Item 2.5.3.1.1 shall be replaced by the following:
The transition from the end of the sequence of acceleration signals recorded on the standard roadway in the first run to the start of the second run must be smooth and jolt-free. The measurements must not be made during the first run of the set values or of the acceleration signals. More values than the 700 laid down in Appendices 4 and 5 to Annex II may be used if these values were calculated, for example, with a cubic Spline function from the original 700 values.’
Item 2.5.3.1.3 shall be replaced by the following:
Item 2.5.3.2.1 shall be replaced by the following:
The roadway must be firmly set in the ground and the distance between the strips must deviate only slightly over its entire length; the tractor's wheels must be fully supported at all times. Where the strips are formed of blocks, these must be 6 to 8 cm thick, with a distance of 16 cm between the centres of the blocks. The length of the standard roadway shall be 100 m.
The measurements must begin as soon as the axis of the rear axle of the tractor is perpendicular to point D = 0 on the roadway, and end as soon as the axis of the front axle of the tractor is perpendicular to point D = 100 of the test roadway (see the table in Appendix 3 to this Annex).’
Item 2.5.3.2.2 shall be replaced by the following:
The prescribed speed must be maintained without the use of brakes. The vibrations must be measured on the seat and at the point where the seat is attached to the tractor, with a light and a heavy driver.
The speed of 12 km/h must be reached after a run-up track has been traversed. The surface of this run-up track must be flat and must join the standard roadway without any change in level.’
Item 2.5.3.3.1 shall be replaced by the following:
The tests must be carried out with two drivers: one with a total mass of 59 ± 1 kg, of which not more than 5 kg may be carried in a weighting belt around the body; the other with a mass of 98 ± 5 kg with a maximum mass of 8 kg in the weighting belt.’
Item 2.5.3.3.2 shall be replaced by the following:
To measure the vibrations transmitted to the driver, an accelerometer is fixed on a flat plate with a diameter of 250 ± 50 mm, the central part of which must be rigid up to a diameter of 75 mm and must include a rigid device to protect the accelerometer. This plate must be placed in the middle of the seat surface between the seat and the driver and have a non-slip surface.
To measure the vibrations at the seat attachment, an accelerometer must be fixed near to this attachment at a point not more than 100 mm from the median longitudinal plane of the tractor and not outside the vertical projection of the seat surface on the tractor.’
Item 2.5.3.3.3: In the English version only, the symbol ‘Hz’ shall be inserted after the figure ‘80’ to indicate the unit of measurement.
Item 2.5.3.3.5.3: In the German and Danish versions only, the symbol ‘aw’ used in the I formula must be placed in brackets.
The last sentence shall read as follows:
‘The inaccuracy of the entire system for measuring the rms value of the acceleration must not exceed ± 5% of the measured value.’
Item 2.5.3.3.7.1 shall be replaced by the following:
Item 2.5.3.3.7.2 shall be replaced by the following:
Item 2.5.3.3.7.3 shall be replaced by the following:
Item 2.5.4 shall be replaced by the following:
‘2.5.4.Vibration test for tractor seats in accordance with their intended use’
Item 2.5.4.2: In the German version only, ‘Schwingungsprüfung’ shall be replaced by ‘Prüfung auf dem Schwingungsprüfstand’.
Item 2.5.5 shall be replaced by the following:
‘2.5.5.Procedure used for determining the weighted vibration acceleration of seats intended for Category A tractors’
Items 2.5.5.1 and 2.5.5.2 shall be deleted.
Item 2.5.5.3 shall become Item 2.5.5.1 and read as follows:
The acceleration awS measured at the driver's seat must be corrected in accordance with the following equation:
Item 2.5.5.4 shall become Item 2.5.5.2 and read as follows:
Item 2.5.5 shall be replaced by the following:
‘2.5.6.Procedure used for determining the weighted vibration acceleration of seats intended for Category B tractors.’
Item 2.5.6.1 shall be replaced by the following:
Item 2.5.6.2 shall be replaced by the following:
Item 2.5.6.3 shall be replaced by the following:
Item 2.5.6.4 shall be replaced by the following:
In the event of deviations from the value (
) measured at the seat attachment during the test run, the weighted vibration acceleration recorded at the driver's seat during the test on the test stand must be corrected as follows:
Each of the tests on the test stand must be carried out twice. The measured values must not deviate from the arithmetic mean by more than ± 5%.’
After Item 2.5.6.4, the following new items shall be added:
is to be determined in the frequency range from 0,5 to 2,0 Hz at intervals no greater than 0,05 Hz.
After Item 3.1.3, the following new Item 3.1.4 shall be added:
Appendix 2 is hereby replaced by the following:
Appendix 3 is hereby amended as follows:
In the table heading, ‘an arbitrary’ shall be replaced by ‘a’
.
The existing definition of D shall be replaced by the following:
=
distance from the beginning of the standard roadway (in metres).’
Appendix 4 is hereby replaced by the following:
Set-value signals for the test-stand inspection of the driver's seat on Category A (Class I) tractors (Item 2.5.3.1.1):
=
set point;
=
amplitude of the set-value signal (in 10-4 m);
=
measurement time (in seconds).
When the sequence of signals is repeated in the table for 701 points, points 700 and 0 coincide in time at an amplitude of a = 0:
PS No | a10-4 m | ts |
---|---|---|
0 | 0 000 | 0 |
1 | 0 089 | . |
2 | 0 215 | . |
. | . | . |
. | . | . |
. | . | . |
699 | 0 023 | . |
700 | 0 000 | 28,0’ |
Appendix 5 is hereby replaced by the following:
Set-value signals for the test-stand inspection of the driver's seat on Category A (Class II) tractors (Item 2.5.3.1.1):
=
set points;
=
amplitude of the set-value signal (in 10-4 m);
=
measurement time (in seconds).
When the sequence of signals is repeated in the table for 701 points, points 700 and 0 coincide in time at an amplitude of a = 0:
PS No | a10-4 m | ts |
---|---|---|
0 | 0 000 | 0 |
1 | 0 022 | . |
2 | 0 089 | . |
. | . | . |
. | . | . |
. | . | . |
699 | 0 062 | . |
700 | 0 000 | 28,0’ |
The title of Appendix 6 shall be replaced by the following:
‘Test stand (Item 2.5.3.1); example of construction (dimensions in mm)’
Appendices 7, 9 and 10 shall be deleted.
Appendices 8 and 11 shall become Appendices 7 and 8 respectively.
The following shall be added to Item 11 of Annex III:
‘This note must be sent to the competent authorities of the other Member States if they so request.’
The English version only of Annex IV to Directive 78/764/EEC shall be amended as follows:
Item 3 shall be replaced by the following:
depth of seat surface: 300 mm;
width of seat surface: 400 mm.
This provision is applicable only if the values specified for the depth and the width of the seat surface (i.e. 400 ± 50 mm and at least 450 mm respectively) cannot be adhered to on grounds relating to the tractor.’
Item 4: In the French version only, ‘Annex I’ shall be replaced by ‘Annex V’.