1978L0764 — EN — 29.06.1987 — 005.001 — 1
This document is meant purely as a documentation tool and the institutions do not assume any liability for its contents
►B COUNCILDIRECTIVE
of25July1978
on the approximation of the laws of the Member States relating to the driver's seat on wheeled
agricultural orforestrytractors
(78/764/EEC)
(OJ L 255, 18.9.1978, p. 1)
Amended by:
Official Journal
No page date
►M1Council Directive 82/890/EEC of 17 December 1982 L 378 45 31.12.1982
►M2Commission Directive 83/190/EEC 28 March 1983 L 109 13 26.4.1983
►M3Council Directive 87/354/EEC of 25 June 1987 L 192 43 11.7.1987
Amended by:
►A1Act of Accession of Greece L 291 17 19.11.1979
►A2Act of Accession of Spain and Portugal L 302 23 15.11.1985
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COUNCILDIRECTIVE
of25July1978
on the approximationof the lawsofthe Member States relating to
thedriver'sseatonwheeledagricultural orforestrytractors
(78/764/EEC)
THE COUNCIL OF THE EUROPEAN COMMUNITIES,
Having regard to the Treaty establishing the European Economic
Community, and in particular Article 100 thereof,
Having regard to the proposal from the Commission,Having regard to the opinion of the European Parliament(
1),
Having regard to the opinion of the Economic and Social
Committee(2),
Whereas the technical requirements which tractors must satisfy
pursuant to national laws relate inter alia to the driver'ss eat;
Whereasthe requirementsdiffer from one Member State to another;
whereas it is therefore necessary that all Member States adopt thesame requirements either in addition to or in place of their existingrules, in order, in particular, to allow the EEC type-approval procedure
which wasthe s ubject of Council Directive 74/150/EEC of 4 March
1974 on the approximation of the lawsof the Member Statesrelatingto the type-approval of wheeled agricultural or forestry tractors(
3)t o
be introduced in respect of each type of tractor;
Whereasthe rulesrelating to driver'ss eatscover not only the require-
ments for their installation on tractors but also the construction of theseats; whereas a harmonized component type-approval proceduremakes it possible for each Member State to check compliance withthe common construction and testing requirements and to inform theother Member Statesof itsfindingsby s ending a copy of the compo-
nent type-approval certificate completed for each type of driver'ss eat;
whereasthe placing of an EEC component type-approval mark on alldriver'ss eatsmanufactured in conformity with the approved type obvi-ates any need for technical checks on those driver's seats in the otherMember States,
HAS ADOPTED THIS DIRECTIVE:
Article 1
1. Each Member State shall grant EEC component type-approval for
any type of driver's seat which satisfies the construction and testing
requirementslaid down in AnnexesI and II.
2. The Member State which hasgranted EEC component type-
approval shall take the measures required in order to verify, in so faras is necessary and if need be in cooperation with the competent autho-
ritiesin the other Member States , that production modelsconform to
the approved type. Such verification shall be limited to spot checks.
Article 2
Member States shall, for each type of driver's seat which they approve
pursuant to Article 1, issue to the manufacturer or to his authorized
representative, an EEC component type-approval mark conforming tothe model shown in 3.5 of Annex II.
Member States shall take all appropriate measures to prevent the use of
marks liable to create confusion between driver's seats which have been1978L0764 — EN — 29.06.1987 — 005.001 — 2
(1) OJ No C 299, 12. 12. 1977, p. 61.
(2) OJ No C 84, 8. 4. 1978, p. 11.
(3) OJ No L 84, 28. 3. 1974, p. 10.
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granted component type-approval pursuant to Article 1 and other
devices.
Article 3
1. No Member State may prohibit the placing on the market of
driver's seats on grounds relating to their construction if they bear theEEC component type-approval mark.
2. Nevertheless, a Member State may prohibit the placing on the
market of driver'ss eatsbearing the EEC component type-approval
mark which consistently fail to conform to the approved type.
That State shall forthwith inform the other Member States and the
Commission of the measures taken, specifying the reasons for its deci-sion.
Article 4
The competent authoritiesof each Member State s hall within one
month send to the competent authorities of the other Member States acopy of the component type-approval certificates, an example of whichisgiven in Annex III, completed for each type of driver'ss eat whichthey approve or refuse to approve.
Article 5
1. If the Member State which hasgranted EEC component type-
approval finds that a number of driver's seats bearing the same EECcomponent type-approval mark do not conform to the type which it
has approved, it shall take the necessary measures to ensure that
production modelsconform to the approved type. The competentauthorities of that State shall advise those of the other Member Statesof the measures taken, which may, if necessary, where there is seriousand repeated failure to conform, extend to withdrawal of EEC compo-nent type-approval. The said authorities shall take the same measures if
they are informed by the competent authoritiesof another Member
State of such failure to conform.
2. The competent authoritiesof the Member Statess hall inform each
other within one month of any withdrawal of EEC component type-approval, and of the reasons for such a measure.
Article 6
Any decision taken pursuant to the provisions adopted in implementa-
tion of thisDirective to refus e or withdraw EEC component type-approval for a driver'ss eat or to prohibit itsplacing on the market oruse, shall set out in detail the reasons on which it is based. Such deci-sions shall be notified to the party concerned, who shall at the same
time be informed of the remediesavailable to him under the lawsin
force in the Member Statesand of the time limitsallowed for the exer-cise of such remedies.
Article 7
No Member State may refuse to grant EEC type-approval or national
type-approval for a tractor on groundsrelating to itsdriver'ss eat ifthisbearsthe EEC component type-approval mark and isfitted inaccordance with the requirementslaid down in Annex IV.
Article 8
No Member State may refuse or prohibit the sale, registration, entry
into service or use of any tractor on grounds relating to the driver'sseat if this bears the EEC component type-approval mark and is fittedin accordance with the requirementss et out in Annex IV.1978L0764 — EN — 29.06.1987 — 005.001 — 3
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Article 9
1. For the purpose of this Directive, ‘agricultural or forestry tractor’
means any motor vehicle, fitted with wheels or endless tracks, having
at least two axles, the main function of which lies in its tractive power
and which is specially designed to tow, push, carry or power certaintools, machinery or trailers intended for agricultural or forestry use. Itmay be equipped to carry a load and passengers.
2. ThisDirective s hall apply only to tractorsdefined in paragraph I
which are equipped with pneumatic tyresand have at leas t two axles
and a maximum design speed of between 6 and 30 km/h.
Article 10
Any amendments necessary to adjust the requirements of the Annexes
to this Directive to take account of technical progress shall be adoptedin accordance with the procedure laid down in Article 13 of Directive74/150/EEC.
Article 11
1. Member States shall bring into force the provisions necessary in
order to comply with thisDirective within 18 monthsof itsnotificationand shall forthwith inform the Commission thereof.
2. Member States shall ensure that the texts of the main provisions
of national law which they adopt in the field covered by thisDirective
are communicated to the Commission.
Article 12
This Directive is addressed to the Member States.1978L0764 — EN — 29.06.1987 — 005.001 — 4
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ANNEX I
DEFINITIONS
1.Driver's seat
‘Driver's seat’ means that seat capable of accommodating one person only,
provided for the use of the driver when driving the tractor.
2.Seatsurface
‘Seat surface’ means the almost horizontal area of the seat which supports
the driver when seated.
3.Backrest
‘Backrest’ means the almost vertical area of the seat supporting the
driver'sback when s eated.
4.Lateral seatsupports
‘Lateral seat supports’ means the devices or forms of the seat surface
which prevent the driver from sliding sideways.
4.1.Seatarmrests
‘Seat armrests’ means the devices on either side of the seat which support
the driver'sarmswhen he iss eated.
5.Seatreference point(S)
‘Seat reference point (S)’ meansthe point of inters ection in the median
longitudinal plane of the seat between the tangential plane at the base of
the padded backrest and a horizontal plane. This horizontal plane inter-
sects the lower surface of the seat 150 mm in front of the seat reference
point (S) (see Appendix 1 to Annex II).
6.Depthoftheseatsurface
‘Depth of the seat surface’ means the horizontal distance between the seat
reference point (S) and the front edge of the seat surface.
7.Widthoftheseatsurface
‘Width of the seat surface’ means the horizontal distance between the
outside edges of the seat surface measured in a plane perpendicular to
the median plane of the seat.
8.Loadadjustmentrange
‘Load adjustment range’ means the range between the two loads corre-
sponding to the mean positions in the suspension system curves plotted
for the heaviest and lightest driver.
9.Suspensiontravel
‘Suspension travel’ means the vertical distance between the highest posi-
tion 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 long-
itudinal plane.
10.Vibration
‘Vibration’ meansthe vertical movement up and down of the driver'ss eat.
11.Vibrationacceleration (a)
‘Vibration acceleration (a)’ meansthe s econd differential of the vibration
displacement with respect to time.1978L0764 — EN — 29.06.1987 — 005.001 — 5
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12.Rmsvalueoftheacceleration (aeff)
‘Rmsvalue of the acceleration (aeff)’ meansthe s quare root of the mean
square of the accelerations.
►M213.◄Weightedvibrationacceleration (aw)
‘Weighted vibration acceleration (aw)’ meansthe weighted vibration accel-
eration determined with the help of a weighting filter in accordance with
2.5.3.3.5.2 of Annex II.
awS= rms value of the weighted seat vibration acceleration measured
during a bench test or a standard roadway test;
awB= rmsvalue of the weighted vibration acceleration meas ured at
the seat attachment during a bench test;
awB*= reference rmsvalue of the weighted vibration acceleration
measured at the seat attachment;
awS*= corrected rmsvalue of the weighted s eat vibration acceleration
measured during a bench test;
awF*= rmsvalue of the weighted vibration acceleration meas ured at
the seat attachment during a standard roadway test.
►M214.◄Vibrationratio
‘Vibration ratio’ meansthe ratio of the weighted vibration acceleration
measured on the driver's seat to that measured at the seat attachment in
accordance with 2.5.3.3.2 of Annex II.
►M215.◄Vibrationclass
‘Vibration class’ means the class or group of tractors which show the
same vibration characteristics.
16.CategoryAtractor
‘Category A tractor’ means a tractor which can be assigned to a given
vibration class by reason of similar design features.
►M216.1.◄The characteristics of these tractors are as follows:
Number of axles: two.
Load distribution:
— front axle: 30 to 45 % of unladen weight of the tractor,
— rear axle: 70 to 55 % of unladen weight of the tractor.Tyres: front smaller than rear (ratio of tyre radii ≤4: 5).
Track width: smallest adjustable track width greater than 1 150 mm.Suspension: rear axle unsprung.Horizontal position of seat: between rear axle and centre of gravity of
tractor.
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M216.2.◄Category A tractors are subdivided into two classes:
Class I: 1 400 to 3 600 kg unladen mass.
Class II: more than 3 600 to 5 000 kg unladen mass.
17.CategoryBtractor
‘Category B tractor’ means a tractor which cannot be assigned to a vibra-
tion class in Category A.
►M218.◄Seatsofthesametype
‘Seats of the same type’ means seats which do not differ in any essential
respects; the only aspects in which the seats may differ being as follows:1978L0764 — EN — 29.06.1987 — 005.001 — 6
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►M218.1.◄dimensions;
►M218.2.◄position and inclination of the backrest;
►M218.3.◄inclination of the seat surface;
►M218.4.◄longitudinal and vertical adjustment of the seat.1978L0764 — EN — 29.06.1987 — 005.001 — 7
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ANNEX II
CONSTRUCTION ANDTESTING REQUIREMENTS — EEC COMPO-
NENTTYPE-APPROVALANDMARKINGREQUIREMENTS
1. GENERAL REQUIREMENTS
1.1. The driver's seat must be designed to ensure a comfortable position
for the driver when controlling and manoeuvring the tractor, and to
afford him the utmost protection as regards health and safety.
1.2. The seat must be adjustable in the longitudinal direction and in the
height without the use of a tool.
1.3. The seat must be designed to reduce shocks and vibration. It must
therefore be well sprung, have good vibration absorption and
provide adequate support at the rear and sides.
The lateral support is considered adequate if the seat is designed to
prevent the driver's body from slipping sideways.
1.3.1. The seat must be adjustable for persons of different mass. Any
adjustment necessary in order to comply with this requirement,
must be carried out without the use of tools.
1.4. The seat surface, the backrest, the lateral supports and, where fitted,
the removable, folding or fixed armrests, must be padded.
1.5. The seat reference point (S) must be calculated in the manner speci-
fied in Appendix 1 to Annex II.
1.6. Save as otherwise provided, the measurements and tolerances must
comply with the following requirements:
1.6.1. the measurements given must be expressed in whole units, if neces-
sary rounded off to the nearest whole number of units;
1.6.2. the instruments used for making measurements must enable the
measured value to be rounded off to the nearest whole unit and
must be accurate within the following tolerance limits:
— for length: ± 0·5%,
— for angle measurements: ± 1º,— for determination of the mass of the tractor: ±20 kg,
— for measurement of tyre pressure: ►
M2± 0,1 bar ◄;
1.6.3. for all data relating to dimensions, a tolerance of ± 5% is allowed.1.7. The seat must undergo the following tests, carried out on the same
seat and in the order indicated below:
1.7.1. determination of the suspension characteristics and the range of
adjustment to the driver's mass;
1.7.2. determination of lateral stability;
1.7.3. Determination of vertical vibration characteristics.
1.7.4. Determination of the damping characteristics in the resonance
range.
1.8. If the seat is manufactured so that it can revolve about a vertical
axis then tests are carried out with the seat facing the forward posi-
tion,►
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median longitudinal plane of the tractor.
1.9. The seat undergoing the above tests must possess the same charac-
teristics with respect to construction and fittings as the seats in
series production.
1.10. Before the tests are carried out, the seat must have been run in by
the manufacturer.
1.11. A test report, which confirms that the seat has completed all the
specified tests without damage and which includes details of the
seat vibration characteristics, must be prepared by the test labora-
tory.1978L0764 — EN — 29.06.1987 — 005.001 — 8
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1.12. Seats tested for Class I tractors are suitable only for tractors of that
class, whereas seats tested for Class II tractors are suitable for Class
I or Class II tractors.
2. SPECIAL REQUIREMENTS
2.1.Seatsurfacedimensions
2.1.1. The depth of the seat surface, measured parallel to and at a distance
of 150 mm from the median longitudinal plane of the seat, must be
400 ± 50 mm (see figure below).
2.1.2. The width of the seat surface, measured perpendicular to the median
plane of the seat, 150 mm in front of the seat reference point (S)
and at not more than 80 mm above that point, must be at least
450 mm (see figure below).
2.1.3. The depth and width of the surface of seats intended for tractors in
which the minimum rear-wheel track width doesnot exceed
1 150 mm may be reduced to not less than 300 and 400 mm respec-
tively if the design of the tractor prevents compliance with the
requirementsof Items2.1.1 and 2.1.2.
2.2.Positionandinclinationofthebackrest
2.2.1. The upper edge of the backrest of the seat must be at least 260 mm
above the seat reference point (S) (see figure below).
2.2.2. The backrest must have an inclination of 10 ± 5º (see figure below).
2.3.Inclinationoftheseatsurface
2.3.1. The inclination towardsthe rear (s ee angle αin the figure below) of
the surface of the loaded cushion must be 3 to 12º in relation to the
horizontal, measured with the loading device in accordance with
Appendix 1.
2.4.Seatadjustment (see figure below)
2.4.1. The seat must be adjustable in the longitudinal direction over a
minimum distance of:
— 150 mm for tractorswith a minimum rear-wheel track width of
more than 1 150 mm,
— 60 mm for tractorswith a minimum rear-wheel track width of
1 150 mm or less.
2.4.2. The seat must be adjustable in the vertical direction over a
minimum distance of:
— 60 mm for tractorswith a minimum rear-wheel track width of
more than 1 150 mm,
— 30 mm for tractorswith a minimum rear-wheel track width of
1 150 mm or less.1978L0764 — EN — 29.06.1987 — 005.001 — 9
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2.5.Seattests
2.5.1. Determination of the suspension characteristics and the range of
adjustment to the driver's mass
2.5.1.1. The suspension characteristics are determined by a static test. The
range of adjustment to the driver's mass is calculated from the
suspension characteristics. These calculations are not necessary in
the case of seats that cannot be manually adjusted to the driver's
mass.
2.5.1.2. The seat is mounted on a test stand or on a tractor and a load
applied to it, either directly or by meansof a s pecial device; this
load must not differ by more than 5 N from the nominal load.
►M2The measuring error for the suspension travel shall not
exceed ± 1 mm. ◄The load must be applied in accordance with
the procedure laid down in section 3 of Appendix 1.1978L0764 — EN — 29.06.1987 — 005.001 — 10
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2.5.1.3. A complete characteristic curve representing the deflection of the
suspension system must be plotted from zero load to maximum
load, and back to zero. The load graduations at which the suspen-
sion travel is measured must not exceed 100 N; at least eight
measurement points must be plotted at approximately equal inter-
vals in the suspension travel. The point taken as the maximum
load should be either that at which no further suspension travel can
be measured, or a load of 1 500 N. After each application or
removal of the load, the suspension travel must be measured
200 mm in front of the seat reference point in the median longitu-
dinal plane of the seat surface. After application or removal of the
load, the seat must be allowed to return to its at-rest position.
2.5.1.4. In the case of seats with a mass adjustment scale, the characteristic
curves representing the deflection of the suspension system areplotted at mass adjustments for drivers having a mass of 50 and
120 kg. In the case of seats without a mass adjustment scale and
with adjustment stops, measurements are taken at the lowest and
the highest mass adjustment. In the case of seats without a mass
adjustment scale or adjustment stops, the adjustment must be so
selected that:
2.5.1.4.1. for the lower mass adjustment limit, the seat just returns to the top
of the suspension travel when the load is removed, and
2.5.1.4.2. for the upper mass adjustment limit, the load of 1 500 N depresses
the seat to the lowest limit of the suspension travel.
2.5.1.5. The mean position of the suspension system is the position which
the seat assumes when it is depressed by half the full travel of the
suspension system.
2.5.1.6. Since the characteristic curves of the suspension system are gener-
ally hysteresis loops, the load must be determined by drawing a
centre line through the loop (see section 8 of Annex I, and sections
A and B of Appendix 2 to Annex II).
2.5.1.7. To determine the limitsof the adjus tment range asa function of the
driver's mass, the vertical forces determined in accordance with
Item 2.5.1.6 for pointsA and B (s ee Appendix 2 to thisAnnex)
must be multiplied by the scale factor 0,13 kg/N.
2.5.2. Determination of lateral stability
2.5.2.1. The seat must be set for the upper limit of the weight adjustment
and connected to the test stand or to the tractor in such a way that
its base plate rests on a rigid plate (test stand) not smaller than the
base plate itself.
2.5.2.2. A test load of 1 000 N is applied to the surface or cushion of the
seat. The point of application must lie 200 mm in front of the seat
reference point (S) and alternately on the two sides 150 mm from
the plane of symmetry through the seat.
2.5.2.3. During application of the load, the variation in the lateral angle of
inclination of the seat surface is measured in the end settings for
horizontal and vertical seat adjustment. The permanent deformation
close to the point of application of the load is not to be taken into
consideration.
2.5.3. Determination of the vertical vibration characteristics
The seat vibration is determined by tests on a test stand and/or a
standard roadway depending on whether the seat is intended for a
class (or classes) of Category A tractor or for a Category B tractor.
2.5.3.1. Testing on the test stand
2.5.3.1.1. The test stand must simulate the vertical vibrations at the point of
attachment of the driver'ss eat. The vibrationsare generated by
meansof an electro-hydraulic device. The s et valuesto be us ed are1978L0764 — EN — 29.06.1987 — 005.001 — 11
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either those specified in Appendices 4 and 5 to Annex II for the
class of tractor in question or the double-integrated acceleration
signals recorded at the seat attachment of a Category B tractor
moving at a speed of 12 ± 0,5 km/h on a standard roadway as
defined in Item 2.5.3.2.1. To generate the vibrations, an uninter-
rupted double run of the set values must be used.
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 accelera-
tion 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.
2.5.3.1.2. Besides an attachment for the test seat, the platform must contain a
steering wheel and footrest. Its configuration must be as shown in
Appendix 6.
2.5.3.1.3. The test stand must have a high degree of flexural and torsional
rigidity and itsbearingsand guidesmus t have no more than the
technically necessary clearance. If the platform is carried on an
oscillating arm, the dimension R must be not less than 2 000 mm
(see Appendix 6). The magnitude of the vibration ratio at frequen-
ciesbetween 0,5 and 5,0 Hz s hall be within the range 1,00 ± 0,05,
measured at intervals not exceeding 0,5 Hz. The phase shift shall
not vary by more than 20º throughout the same frequency range.
2.5.3.2. Testing on a standard roadway
2.5.3.2.1. The roadway consists of two parallel strips spaced according to the
wheel track of the tractor. Both strips must be made of a rigid mate-
rial, such as wood or concrete, and be formed either of blocks set in
a base structure or of a continuous smooth surface. The longitudinal
profile of each track strip is defined by the ordinates of elevation in
relation to a base level; these ordinates are shown in the tables in
Appendix 3. With regard to the roadway, the elevation isdefined
at intervalsof 16 cm along each s trip.
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 isperpendicular to point D = 0 on the roadway, and end
ass oon asthe axisof the front axle of the tractor isperpendicular to
point D = 100 of the test roadway (see the table in Appendix 3 to
thisAnnex).
2.5.3.2.2. Measurements shall be taken at a speed of 12 ± 0,5 km/h.
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.
2.5.3.2.3. The seat must be set for the driver's mass in accordance with the
manufacturer's instructions.
2.5.3.2.4. The tractor must be fitted with a protective frame and/or cab unless
of a type for which thisequipment isnot required. It mus t not carry
any ancillary equipment. Moreover, there must be no ballast on the
wheelsor framework, and no fluid in the tyres .
2.5.3.2.5. The tyres used during the test must have the standard dimensions
and ply-rating, as specified in the manufacturer's instructions. The
depth of the tread must not be less than 65 % of the depth of a
new tread.1978L0764 — EN — 29.06.1987 — 005.001 — 12
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2.5.3.2.6. The side-walls of the tyres must not be damaged. The pressure of
the tyre must correspond to the arithmetical mean of the reference
pressures recommended by the tyre manufacturer. The wheel track
must correspond to that used under normal working conditions for
the tractor model on which the seat is fitted.
2.5.3.2.7. The measurements at the point of seat attachment and on the seat
itself must be made during the same run.
For measuring and recording the vibrations, an accelerometer, a
measuring amplifier and a magnetic tape recorder or direct-reading
vibration meter shall be used. The specifications for these instru-
mentsare aslaid down in 2.5.3.3.2 to 2.5.3.3.6.
2.5.3.3. Specifications for tests on roadway and test stand
2.5.3.3.1. Driver'smas s
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.
2.5.3.3.2. Position of the accelerometer
To measure the vibrations transmitted to the driver, an acceler-
ometer isfixed 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.
2.5.3.3.3. Measurement of vibration acceleration
The accelerometer and the associated amplifying and transmitting
equipment must respond to vibrations with an r.m.s. value of
0·05 m/s2, and be capable of measuring vibrations with an r.m.s.
value of 5 m/s2and a crest factor (ratio of peak to r.m.s. value) of
3 without distortion and with a maximum error of ± 2·5 % over the
range 1 to 80 ►M2Hz◄.
2.5.3.3.4. Magnetic tape recorder
If a tape recorder is used, it must have a maximum reproduction
error of ± 3·5 % in a frequency range of 1 to 80 Hz, including
change of tape speed during replay for analysis.
2.5.3.3.5. Vibration meter
2.5.3.3.5.1. Vibrationsof more than 10 Hz may be dis regarded. It istherefore
permissible to connect upstream of the measuring instrument a
low-pass filter with a cut-out frequency of about 10 Hz and an
attenuation of 12 dB per octave.
2.5.3.3.5.2. This instrument must incorporate an electronic weighting filter
between the sensor and the integrator device. The filter must corre-
spond to the curve shown in Appendix 8 and the margin of error
must be ± 0·5 dB in the 2 to 4 Hz frequency band and ± 2 dB for
the other frequencies.
2.5.3.3.5.3. The electronic measuring device must be capable of indicating
either:
— the integral (I) of the square of the weighted vibration accelera-
tion (aw) for a test time (T)
I¼ZT
oawðÞ2dt
— or the square root of that integral
— or directly the r.m.s. value of the weighted vibration acceleration
(aweff)1978L0764 — EN — 29.06.1987 — 005.001 — 13
▼M2
▼B
▼B
aweff¼ﬃﬃﬃﬃﬃﬃﬃ
I=Tp
¼ﬃﬃ
Ip
ﬃﬃﬃ
Tp
The inaccuracy of the entire system for measuring the rms value of
the acceleration must not exceed ± 5% of the measured value.
2.5.3.3.6. Calibration
All instruments must be regularly calibrated.
2.5.3.3.7. Evaluation of vibration tests
2.5.3.3.7.1. During each test, the weighted vibration acceleration for the whole
test time must be determined with the vibration meter specified in
Item 2.5.3.3.5.
2.5.3.3.7.2. The test report must give the arithmetic mean value of the rms
valuesof the weighted s eat vibration acceleration (awS) for both the
light driver and the heavy driver. The test report must also give the
ratio of the arithmetic mean of the rmsvaluesof the weighted
vibration acceleration measured on the seat (awS) to the arithmetic
mean of the rmsvaluesof the weighted vibration acceleration
measured at the seat attachment (awB). Thisratio s hall be given to
two decimal places.
2.5.3.3.7.3. The ambient temperature during the vibration test must be measured
and shown in the report.
2.5.4. Vibration test for tractor seats in accordance with their intended
use
2.5.4.1. A seat intended for use on a class (or classes) of Category A trac-
tors must be tested on a vibration stand using the appropriate set
value signals.
2.5.4.2. A seat intended for use on a type of Category B tractor must be
tested on a standard roadway with a tractor of that type. However,
a simulation test may also be carried out using a set value signal
corresponding to the acceleration curve which was determined
during the standard roadway test with the type of tractor for which
the seat is intended.
2.5.4.3. A seat intended for use only on a particular type of Category A
tractor may also be tested in accordance with the requirements of
2.5.4.2. In thiscas e, component type-approval will be granted only
for the type of tractor for which the test seat is intended.
2.5.5. Procedure used for determining the weighted vibration acceleration
of seats intended for Category A tractors
2.5.5.1. The test on the vibration test stand shall be carried out in accor-
dance with Item 2.5.3.1. the value awBactually occurring at the seat
attachment during measurement must be determined. In the case of
deviationsfrom the reference value:
awB*= 2,05 m/s2for Category A tractorsin Clas sI;
awB*= 1,7 m/s2for Category A tractorsin Clas sII.
The acceleration awSmeasured at the driver's seat must be corrected
in accordance with the following equation:
a/C3
wS¼awSa/C3
wB
awB
2.5.5.2. For each of the two driversreferred to in Item 2.5.3.3.1, the
weighted vibration acceleration must be measured at the seat over
a period of 28 seconds. The measurement must begin at the set-
value signal corresponding to t = 0 seconds and end at the set-value
signal t = 28 seconds (see Appendices 4 and 5 to this Annex). At1978L0764 — EN — 29.06.1987 — 005.001 — 14
▼M2
▼B
▼M2
▼B
▼M2
▼M2
least two test runs must be carried out. The measured values must
not deviate from the arithmetic mean by more than ± 5 %. Each
complete sequence of set points must be reproduced in a time of
28 ± 0,5 sec.
2.5.6. Procedure used for determining the weighted vibration acceleration
of seats intended for Category B tractors
2.5.6.1. In accordance with the requirementsof Item 2.5.4.2, the s eat vibra-
tion tests are not applicable to a class of tractors, but only to each
tractor type for which the seat is intended.
2.5.6.2. The standard roadway test must be carried out in accordance with
the requirementsof Items2.5.3.2 and 2.5.3.3. The vibration accel-
eration measured on the driver's seat (awS) need not be corrected.
At least two test runs must be carried out on the standard roadway.
The measured values must not deviate from the arithmetic mean by
more than ± 10%.
2.5.6.3. If a bench test is conducted, it must be carried out in association
with a standard roadway test pursuant to the requirements of Items
2.5.3.1 and 2.5.3.3.
2.5.6.4. The vibration test stand shall be adjusted in such a way that the rms
value of the weighted vibration acceleration recorded at the seat
attachment (awB) deviatesby les sthan ± 5 % from the rmsvalue of
the weighted vibration acceleration at the seat attachment recorded
on the standard roadway (a*wF).
In the event of deviationsfrom the value (awF*) 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 asfollows :
a/C3
wS¼awSa/C3
wF
awB:
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%.
2.5.7. Test for determining the damping characteristics in the resonance
range
2.5.7.1. This test is carried out on the test stand as specified in Item 2.5.3.1.
However, account must be taken of the following:
2.5.7.2. Instead of the set values specified in the second paragraph of Item
2.5.3.1.1 (see Appendices 4 and 5 to this Annex), sinusoidal oscilla-
tionsof ± 15 mm amplitude with a frequency of 0,5 to 2 Hz are
generated. The frequency range isto be run through with a cons tant
rate of frequency change in not less than 60 seconds or at intervals
no greater than 0,05 Hz with increasing frequency, and in an iden-
tical manner with decreasing frequency. During this measurement, it
is permissible to filter the signals emitted by the accelerometers
through a bandpass filter with cut-off frequencies of 0,5 and 2,0 Hz.
2.5.7.3. The seat is to be loaded with a ballast of 40 kg in the first test and
with a mass of 80 kg in the second test; the ballast is to be applied
on the device illustrated in Figure 1 of Appendix 1, with the same
line of action of the force aswhen determining the s eat reference
point.
2.5.7.4. The ratio of the rmsvaluesof the vibration acceleration on the s eat
surface awSto those at the seat attachment awB:
V¼awS
awB
isto be determined in the frequency range from 0,5 to 2,0 Hz at
intervalsno greater than 0,05 Hz.1978L0764 — EN — 29.06.1987 — 005.001 — 15
▼M2
2.5.7.5. The ratio measured must be given in the test report to two decimal
places.
3. EEC COMPONENT TYPE-APPROVAL AND MARKING
REQUIREMENTS
3.1.Conditions necessary for EEC component type-approval of a
seat
To be granted EEC component type-approval, a seat must, in addi-
tion to fulfilling the requirements set out above, satisfy the
following conditions:
3.1.1. the range of adjustment as a function of the driver's mass must
extend from at least 50 to 120 kg;
3.1.2. the change in the angle of inclination measured during the lateral
stability test must not exceed 5º;
3.1.3. neither of the two values described in 2.5.3.3.7.2 must exceed
1·25 m/s2.
3.1.4. The ratio referred to in Items2.5.7.4 and 2.5.7.5 s hall not exceed
the value of 2.
3.2.ApplicationforEECcomponenttype-approval
3.2.1. The application for EEC component type-approval must be
submitted by the owner of the trade name or mark or by his author-
ized representative.
3.2.2. For each type of driver's seat, the application must be accompanied
by:
3.2.2.1. a brief technical description, stating in particular the type of tractor
or tractorsfor which it isintended;
3.2.2.2. drawingsin triplicate, s ufficiently detailed to permit identification
of the type of seat and showing in particular its dimensions, its
weight, its suspension system and its means of attachment;
3.2.2.3. at least one seat;
3.2.2.4. one tractor (if necessary) representative of the type of tractor for
which the seat is intended.
3.3.Inscriptions
3.3.1. The seat submitted for EEC component type-approval must bear the
applicant'strade name or mark, clearly and indelibly ins cribed.
3.3.2. On each seat there must be a space large enough for the EEC
component type-approval mark; this space must be shown on the
drawingsreferred to in 3.2.2.2.
3.4.EECcomponenttype-approval
3.4.1. If the seat submitted in accordance with 3.2 complies with the
requirementsof 3.1 and 3.3, EEC component type-approval is
granted and a component type-approval number allocated.
3.4.2. This number must not be allocated to any other type of seat.
3.5.Marking
3.5.1. Every seat conforming to a type approved in pursuance of this
Directive must bear an EEC component type-approval mark.
3.5.2. This mark must consist of:
3.5.2.1. a rectangle surrounding the lower-case letter ‘e’ followed by the
distinguishing number or letters of the Member State which has
granted the component type-approval:
1 for Germany1978L0764 — EN — 29.06.1987 — 005.001 — 16
▼B
▼M2
▼B
▼A2
▼A2
2 for France
3 for Italy4 for the Netherlands6 for Belgium
9 for Spain
11 for the United Kingdom13 for Luxembourg
DK for Denmark
EL for Greece
IRL for Ireland
P for Portugal
3.5.2.2. the EEC component type-approval number which corresponds to the
number of the EEC component type-approval certificate issued for
the type of seat, below and close to the rectangle; and
3.5.2.3. the indication, above and close to the rectangle, of the type of Cate-
gory A tractor for which the s eat isintended. Thisisto be s hown as
follows:
— for Category A tractorsin Clas sI: I.
— for Category A tractors in Classes I and II: I and II.
If no indication isgiven above the rectangle, the s eat isintended for
a Category B tractor.
3.5.3. The EEC component type-approval mark must be affixed to the seat
in such a way that it is indelible and clearly legible even when the
seat is mounted on the tractor.
3.5.4. An example of the component type-approval mark isgiven in
Appendix 11.
3.5.5. The dimensions of the various parts of this mark must not be
smaller than the minimum dimensions specified for marking as illu-
strated in Appendix 11.1978L0764 — EN — 29.06.1987 — 005.001 — 17
▼M3
▼A2
▼B
▼B
Appendix 1
Methodofdeterminingtheseatreference point(S)
1. DEFINITION OF THE REFERENCE POINT (S)
‘Seat reference point’ (S) meansthe point of inters ection in the median long-
itudinal plane of the seat between the tangential plane at the base of the
padded backrest and a horizontal plane. This horizontal plane intersects the
lower surface of the seat 150 mm in front of the seat reference point (S).
2. DEVICE FOR DETERMINING THE SEAT REFERENCE POINT (S)
The device illustrated in Figure 1 consists of a seat pan board and backrest
boards. The lower backrest boards must be hinged in the region of the
ischium humps (A) and the loin (B), the hinge (B) being adjustable in height.
3. METHOD OF DETERMINING THE SEAT REFERENCE POINT (S)
The seat reference point (S) must be obtained by using the device illustrated
in Figures1 and 2, which s imulatesloading by a human occupant. The
device must be positioned on the seat. It must then be loaded with a force
of 550 N at a point 50 mm in front of hinge (A) and two partsof the backres t
lightly pressed tangentially against the padded backrest.
If it is not possible to determine definite tangents to each area of the padded
backrest (below and above the lumbar region) the following procedure must
be adopted:
(a) where there is no possibility of defining the tangent to the lowest
possible area, the lower part of the backrest board in a vertical position
must be lightly pressed against the padded backrest;
(b) where there is no possibility of defining the tangent to the highest
possible area, if the lower part of the backrest board is vertical, the hinge
must be fixed at a height of 230 mm above the seat reference point (S).
The two parts of the backrest board in a vertical position must then be
lightly pressed tangentially against the padded backrest.1978L0764 — EN — 29.06.1987 — 005.001 — 18
▼B
Figure 1
Devicefordeterminingtheseatreference point(S)
1978L0764 — EN — 29.06.1987 — 005.001 — 19
▼B
Figure 2
Deviceinposition
1978L0764 — EN — 29.06.1987 — 005.001 — 20
▼M2
Appendix 2
Determination of the characteristic curves of the suspension system and the load adjustment range
(Item 2.5.1)
1978L0764 — EN — 29.06.1987 — 005.001 — 21
▼B
Appendix 3
Testonstandardroadway
Table of elevation ordinatesin relation to ►M2a◄basic level defining the
surface of each strip of the roadway (2.5.3.2.1)
D = distance from the beginning of the standard roadway (in metres)
L = ordinate of the left-hand strip (mm)
R = ordinate of the right-hand strip (mm)
DLR
0 115 140
0·16 110 125
0·32 110 140
0·48 115 135
0·64 120 135
0·80 120 125
0·96 125 135
1·12 120 125
1·28 120 115
1·44 115 110
1·60 110 100
1·76 110 110
1·92 110 110
2·08 115 115
2·24 110 110
2·40 100 110
2·56 100 100
2·72 95 110
2·88 95 95
3·04 90 95
3·20 90 100
3·36 85 100
3·52 90 100
3·68 90 115
3·84 95 110
4·00 90 110
4·16 90 95
4·32 95 100
4·48 100 100
4·64 100 90
4·90 90 90
4·96 90 90
5·12 95 90
5·28 95 70
5·44 95 65
5·60 90 50
5·76 95 50
5·92 85 50
6·08 85 55
6·24 75 55
6·40 75 55
6·56 70 65
6·72 75 75
6·88 65 75
7·04 65 85
7·20 65 90
7·36 75 95
7·52 75 100
7·68 95 95
7·84 115 1101978L0764 — EN — 29.06.1987 — 005.001 — 22
▼M2
▼B
▼B
DLR
8·00 115 100
8·16 125 110
8·32 110 100
8·48 110 1008·64 110 95
8·80 110 95
8·96 110 959·12 110 1009·28 125 909·44 120 100
9·60 135 95
9·76 120 959·92 120 95
10·08 120 9510·24 115 85
10·40 115 90
10·56 115 8510·72 115 9010·88 120 9011·04 110 75
11·20 110 75
11·36 100 8511·52 110 8511·68 95 9011·84 95 90
12·00 95 85
12·16 100 9512·32 100 9012·48 95 8512·64 95 85
12·80 95 90
12·96 85 9013·12 85 8513·28 75 9013·44 75 95
13·60 75 90
13·76 70 7513·92 70 9014·08 70 10014·24 70 110
14·40 65 95
14·56 65 10014·72 65 90
14·88 65 90
15·04 65 85
15·20 55 85
15·36 65 8515·52 65 8515·68 55 7515·84 55 85
16·00 65 75
16·16 55 8516·32 50 7516·48 55 7516·64 65 75
16·80 65 75
16·96 65 8517·12 65 7017·28 65 6517·44 65 75
17·60 65 75
17·76 50 7517·92 55 8518·08 55 8518·24 65 851978L0764 — EN — 29.06.1987 — 005.001 — 23
▼B
DLR
18·40 70 75
18·56 75 75
18·72 95 75
18·88 90 7519·04 90 70
19·20 95 70
19·36 85 7019·52 85 7519·68 75 8519·84 85 85
20·00 75 90
20·16 85 8520·32 75 7020·48 70 7520·64 65 75
20·80 70 75
20·96 65 7521·12 70 7521·28 70 8521·44 70 85
21·60 70 90
21·76 75 9521·92 75 9522·08 75 9022·24 85 90
22·40 85 95
22·58 90 8522·72 90 8522·88 95 8523·04 95 85
23·20 100 85
23·36 100 7523·52 110 8523·68 110 8523·84 110 85
24·00 100 75
24·16 100 7524·32 95 7024·48 100 7024·64 100 70
24·80 115 75
24·96 110 7525·12 110 85
25·28 100 75
25·44 110 95
25·60 100 95
25·76 115 10025·92 115 10026·08 110 9526·24 115 95
26·40 110 95
26·56 100 9526·72 100 9526·88 100 10027·04 100 95
27·20 100 95
27·36 110 9027·52 115 9027·68 115 8527·84 110 90
28·00 110 85
28·16 110 8528·32 100 8528·48 100 9028·64 90 851978L0764 — EN — 29.06.1987 — 005.001 — 24
▼B
DLR
28·80 90 75
28·96 75 90
29·12 75 75
29·28 75 7529·44 70 75
29·60 75 75
29·76 75 8529·92 85 7530·08 75 7530·24 85 75
30·40 75 75
30·56 70 7530·72 75 7530·88 85 7531·04 90 75
31·20 90 85
31·36 100 7531·52 100 7531·68 120 8531·84 115 75
32·00 120 85
32·16 120 8532·32 135 9032·48 145 9532·64 160 95
32·80 165 90
32·96 155 9033·12 145 9033·28 140 9533·44 140 85
33·60 140 85
33·76 125 7533·92 125 7534·08 115 8534·24 120 75
34·40 125 75
34·56 115 8534·72 115 7534·88 115 9035·04 115 100
35·20 120 100
35·36 120 10035·52 135 95
35·68 135 95
35·84 135 95
36·00 135 90
36·16 120 7536·32 115 7536·48 110 7036·64 100 65
36·80 110 55
36·96 115 5537·12 100 5037·28 115 5037·44 110 50
37·60 100 65
37·76 90 5537·92 95 5538·08 90 3538·24 90 35
38·40 110 35
38·56 100 3538·72 115 3538·88 100 3539·04 100 351978L0764 — EN — 29.06.1987 — 005.001 — 25
▼B
DLR
39·20 110 30
39·36 110 45
39·52 110 50
39·68 100 5539·84 110 50
40·00 90 55
40·16 85 5540·32 90 6540·48 90 6540·64 90 70
40·80 95 75
40·96 95 7541·12 95 7541·28 90 9041·44 90 95
41·60 85 95
41·76 85 10041·92 90 10042·08 90 9542·24 85 100
42·40 85 110
42·56 95 11042·72 95 11542·88 95 11543·04 100 100
43·20 100 95
43·36 100 9543·52 100 9043·68 110 9543·84 100 100
44·00 110 90
44·16 100 8544·32 110 9044·48 110 8544·64 100 85
44·80 100 90
44·96 95 9045·12 90 9545·28 90 10045·44 95 100
45·60 90 90
45·76 85 9045·92 75 90
46·08 85 90
46·24 75 90
46·40 75 90
46·54 75 9046·72 85 9046·88 85 8547·04 90 85
47·20 75 85
47·36 65 7547·52 70 7047·68 70 7547·84 70 75
48·00 75 85
48·16 90 9548·32 95 9548·48 100 12048·64 110 100
48·30 115 100
48·96 115 11549·12 120 11549·28 120 11049·44 115 951978L0764 — EN — 29.06.1987 — 005.001 — 26
▼B
DLR
49·60 115 90
49·76 115 90
49·92 110 95
50·08 110 10050·24 100 110
50·40 100 120
50·56 95 12050·72 95 11550·88 95 12051·04 95 120
51·20 90 135
51·36 95 12551·52 95 12051·68 100 12051·84 100 120
52·00 100 120
52·16 100 12552·32 110 12552·48 110 12552·64 100 125
52·80 100 120
52·96 100 12053·12 110 11553·28 100 11053·44 110 110
53·60 95 110
53·76 95 11053·92 100 11054·08 95 10054·24 100 100
54·40 100 100
54·56 100 10054·72 95 10054·88 100 10055·04 100 115
55·20 110 115
55·36 100 11055·52 110 10055·68 100 11055·84 100 110
56·00 100 110
56·16 95 11556·32 90 110
56·48 95 110
56·64 95 110
56·80 90 100
56·96 100 10057·12 100 9557·28 95 10057·44 100 100
57·60 95 115
57·76 85 11057·92 90 11558·08 90 11058·24 90 100
58·40 85 95
58·56 90 9558·72 85 9058·88 90 9059·04 90 95
59·20 90 115
59·36 90 11559·52 90 11559·68 85 11059·84 75 1101978L0764 — EN — 29.06.1987 — 005.001 — 27
▼B
DLR
60·00 90 115
60·16 90 120
60·32 90 120
60·48 90 12060·64 95 120
60·80 95 120
60·96 90 12061·12 90 11561·28 95 11061·44 95 110
61·60 100 100
61·76 110 10061·92 100 10062·08 100 10062·24 95 100
62·40 95 100
62·56 95 10062·72 90 10062·88 90 10063·04 90 100
63·20 90 90
63·36 90 9063·52 85 9063·68 85 9063·84 75 85
64·00 75 85
64·16 75 7564·32 75 7564·48 70 7564·64 70 70
64·80 70 55
64·96 70 4565·12 65 5565·28 65 5565·44 65 65
65·60 55 70
65·76 55 7565·92 55 7566·08 55 7566·24 55 85
66·46 55 85
66·56 65 9066·72 70 90
66·88 70 110
67·04 65 100
67·20 55 100
67·36 65 10067·52 50 10067·68 50 8567·84 50 90
68·00 50 100
68·16 55 10068·32 55 9568·48 65 9068·64 50 85
68·80 50 70
68·96 50 7069·12 50 6569·28 50 5569·44 45 50
69·60 35 50
69·76 35 5569·92 35 6570·08 35 6570·24 35 651978L0764 — EN — 29.06.1987 — 005.001 — 28
▼B
DLR
70·40 35 55
70·58 45 55
70·72 50 55
70·88 50 5071·04 50 45
71·20 50 45
71·36 50 5071·52 45 4571·68 45 5571·84 55 65
72·00 55 65
72·16 70 6572·32 70 7572·48 75 8572·64 75 85
72·80 75 90
72·96 85 9573·12 90 10073·28 90 11073·44 90 115
73·60 90 120
73·76 90 11573·92 90 11574·08 110 11574·24 100 100
74·40 100 110
74·56 100 11074·72 95 11574·88 95 12075·04 95 125
75·20 95 135
75·36 100 13575·52 100 14075·68 100 14075·84 100 140
76·00 110 135
76·16 100 12576·32 100 12576·48 100 12576·64 110 125
76·80 115 125
76·96 120 12577·12 120 125
77·28 120 135
77·44 110 125
77·60 100 125
77·76 120 13577·92 120 12578·03 120 12578·24 115 125
78·40 115 120
78·56 115 12078·72 110 12078·88 100 12079·04 100 120
79·20 95 120
79·36 95 12079·52 95 12579·68 95 12579·84 100 120
80·00 95 125
80·16 95 12580·32 95 12580·48 100 12080·64 100 1251978L0764 — EN — 29.06.1987 — 005.001 — 29
▼B
DLR
80·80 100 125
80·96 110 125
81·12 115 135
81·28 110 14081·44 115 140
81·60 110 140
81·76 115 14081·92 110 14082·08 110 14082·24 110 135
82·40 110 135
82·56 100 12587·72 110 12582·88 110 12583·04 100 125
83·20 100 120
83·36 100 12583·52 100 12083·68 100 13583·84 95 140
84·00 100 135
84·16 110 14084·32 110 14084·48 110 14084·64 110 140
84·80 120 155
84·96 115 14585·12 115 15585·28 120 16085·44 120 165
85·60 120 160
85·76 125 16585·92 135 16086·08 135 16086·24 125 155
86·40 125 155
86·56 120 14586·72 120 14586·98 110 14087·04 110 140
87·20 110 140
87·36 110 14087·52 110 140
87·68 100 135
87·84 100 135
88·00 100 135
88·16 100 12588·32 110 12088·48 115 12088·64 110 120
88·80 110 125
88·96 100 12589·12 100 12589·28 95 12589·44 95 125
89·60 100 120
89·76 100 13589·92 110 14090·08 110 13590·24 110 140
90·40 100 145
90·56 100 15590·72 110 15590·88 110 15591·04 100 1551978L0764 — EN — 29.06.1987 — 005.001 — 30
▼B
DLR
91·20 110 155
91·36 110 160
91·52 115 160
91·68 110 155
91·84 115 155
92·00 115 140
92·16 115 155
92·32 120 155
92·48 125 145
92·64 125 155
92·80 125 155
92·96 120 155
93·12 120 145
93·28 120 145
93·44 115 145
93·60 120 145
93·76 115 140
93·92 115 140
94·08 115 140
94·24 115 140
94·40 115 140
94·56 115 140
94·72 115 135
94·88 115 135
95·04 110 135
95·20 110 135
95·36 110 135
95·52 115 135
95·68 100 140
95·84 95 135
96·00 100 125
96·16 95 125
96·32 95 125
96·48 95 125
96·64 110 125
96·80 95 120
96·96 95 120
97·12 95 120
97·28 95 110
97·44 100 115
97·60 110 120
97·76 110 115
97·92 100 115
98·08 95 115
98·24 100 115
98·40 95 115
98·52 100 115
98·72 100 110
98·88 110 100
99·04 95 95
99·20 90 100
99·36 90 100
93·52 75 110
99·68 75 115
99·84 75 115
100·00 75 1101978L0764 — EN — 29.06.1987 — 005.001 — 31
▼M2
Appendix 4
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):
PS = set point;
a = amplitude of the set-value signal (in 10−4m);
t = 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 Noa
10−4mt
s
0 0 000 0
1 0 089 .
2 0 215 .
.. .
.. .
.. .
699 0 023 .
700 0 000 28,01978L0764 — EN — 29.06.1987 — 005.001 — 32
▼M2
Appendix 5
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):
PS = set points;
a = amplitude of the set-value signal (in 10−4m);
t = 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 Noa
10−4mt
s
0 0 000 0
1 0 022 .
2 0 089 .
.. .
.. .
.. .
699 0 062 .
700 0 000 28,01978L0764 — EN — 29.06.1987 — 005.001 — 33
▼B
Appendix 6
Teststand(Item2.5.3.1);exampleofconstruction (dimensions in mm)
1978L0764 — EN — 29.06.1987 — 005.001 — 34
▼M2
▼B
▼M2
Appendix ►M27◄
Characteristicofthefilter ofthevibrationmeasuringinstrument(2.5.3.3.5)
1978L0764 — EN — 29.06.1987 — 005.001 — 35
▼B
▼M2
▼B
Appendix ►M28◄
ExampleofanEECcomponenttype-approvalmark(3.5)
The seat bearing the EEC type-approval mark above is a seat intended for a Category A tractor in
Class I and approved in Germany (e1) under number 1 005.1978L0764 — EN — 29.06.1987 — 005.001 — 36
▼B
ANNEX III
MODELEECCOMPONENTTYPE-APPROVALCERTIFICATE
►(1)M21978L0764 — EN — 29.06.1987 — 005.001 — 37
▼B
ANNEX IV
DRIVER'S SEAT INSTALLATION REQUIREMENTS FOR EEC TYPE-
APPROVALOFATRACTOR
1. Every driver's seat must bear the EEC component type-approval mark and
comply with the following installation requirements:
1.1. the driver's seat must be installed in such a way that:1.1.1. the driver is assured of a comfortable position for driving and
manoeuvring the tractor;
1.1.2. the seat is easily accessible;1.1.3. the driver, when seated in the normal driving position, can easily reach
the variouscontrolsof the tractor that are likely to be actuated during
operation;
1.1.4. no part of any of the seat or tractor components is likely to cause the
driver to suffer cuts or bruises;
1.1.5. where the seat is adjustable only in length or height, its plane of
symmetry must coincide or be parallel with the median longitudinal plane
of the tractor;
1.1.6. where the seat is designed to revolve round a vertical axis it must be
capable of being locked in all or certain positions and in any case in the
position mentioned in 1.1.5.
2. The holder of the EEC type-approval may request that it be extended to
other types of seat. The competent authorities must grant this extension
on the following conditions:
2.1. the new type of seat has received EEC component type-approval;
2.2. it has been designed to be installed on the type of tractor for which the
extension of the EEC type-approval has been requested;
2.3. it is installed in such a manner as to comply with the installation require-
mentsin thisAnnex.
3. Seatsintended for tractorswith a minimum rear-wheel track of not more
than 1 150 mm may have the following minimum dimensions in respect
of the depth and width of the seat surface:
— 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.
4. A certificate conforming to the model shown in Annex V is to be
attached to the EEC type-approval certificate for each type-approval or
extension of type-approval granted or refused.1978L0764 — EN — 29.06.1987 — 005.001 — 38
▼M2
▼B
▼B
ANNEX V
ANNEX TO THE EEC TYPE-APPROVAL CERTIFICATE FOR A TRACTOR WITH
REGARDTOTHEDRIVER'SSEAT
(Articles4 (2) and 10 of 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)
1978L0764 — EN — 29.06.1987 — 005.001 — 39