1978L0764 — EN — 01.01.1981 — 001.001 — 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
►A1Act of Accession of Greece L 291 17 19.11.1979
▼B
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's seat;
Whereas the requirements differ 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 was the subject of Council Directive 74/150/EEC of 4 March
1974 on the approximation of the laws of the Member States relatingto the type-approval of wheeled agricultural or forestry tractors(
3)t o
be introduced in respect of eachtype of tractor;
Whereas the rules relating to driver's seats cover 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 eachMember State to ch eck compliance withthe common construction and testing requirements and to inform theother Member States of its findings by sending a copy of the compo-
nent type-approval certificate completed for eachtype of driver's seat;
whereas the placing of an EEC component type-approval mark on alldriver's seats manufactured in conformity withth e 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. EachMember State sh all grant EEC component type-approval for
any type of driver's seat which satisfies the construction and testing
requirements laid down in Annexes I and II.
2. The Member State which has granted 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-
rities in the other Member States, that production models conform 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 — 01.01.1981 — 001.001 — 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's seats bearing 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 authorities of each Member State shall within one
month send to the competent authorities of the other Member States acopy of the component type-approval certificates, an example of whichis given in Annex III, completed for eachtype of driver's seat wh ichthey approve or refuse to approve.
Article 5
1. If the Member State which has granted 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 models conform 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 authorities of another Member
State of suchfailure to conform.
2. The competent authorities of the Member States shall 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 this Directive to refuse or withdraw EEC component type-approval for a driver's seat or to prohibit its placing 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 remedies available to him under the laws in
force in the Member States and of the time limits allowed for the exer-cise of suchremedies.
Article 7
No Member State may refuse to grant EEC type-approval or national
type-approval for a tractor on grounds relating to its driver's seat ifthis bears the EEC component type-approval mark and is fitted inaccordance withth e requirements laid 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 withth e requirements set out in Annex IV.1978L0764 — EN — 01.01.1981 — 001.001 — 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. This Directive shall apply only to tractors defined in paragraph 1
which are fitted with pneumatic tyres and which have two axles and amaximum design speed of between 6 and 25 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 adopted
in accordance withth e procedure laid down in Article 13 of Directive
74/150/EEC.
Article 11
1. Member States shall bring into force the provisions necessary in
order to comply with this Directive within 18 months of its notificationand 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 this Directiveare communicated to the Commission.
Article 12
This Directive is addressed to the Member States.1978L0764 — EN — 01.01.1981 — 001.001 — 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's back when seated.
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's arms when he is seated.
5.Seatreference point(S)
‘Seat reference point (S)’ means the point of intersection 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 distance from the highest to the lowest
position in the suspension system.
10.Vibration
‘Vibration’ means the vertical movement up and down of the driver's seat.
11.Vibrationacceleration (a)
‘Vibration acceleration (a)’ means the second differential of the vibration
displacement withrespect to time.
12.Rmsvalueoftheacceleration (aeff)
‘Rms value of the acceleration (aeff)’ means the square root of the mean
square of the accelerations.1978L0764 — EN — 01.01.1981 — 001.001 — 5
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13.Spectralpowerdensity (Ø)
‘Spectral power density (Ø)’ means the square of the root mean square of
the accelerations (aeff) measured withtertiary filters, divided by th e band-
widthof th ose filters.
14.Weightedvibrationacceleration (aw)
‘Weighted vibration acceleration (aw)’ means the weighted vibration accel-
eration determined with the help of a weighting filter in accordance with
2.5.3.3.5.2 of Annex II.
15.Vibrationratio
‘Vibration ratio’ means the ratio of the weighted vibration acceleration
measured on the driver's seat to that measured at the seat attachment in
accordance with2.5.3.3.2 of Annex II.
16.Vibrationclass
‘Vibration class’ means the class or group of tractors which show the
same vibration characteristics.
17.CategoryAtractor
‘Category A tractor’ means a tractor whose characteristics enable it to be
included in a given vibration class because of similar constructional
features.
17.1. 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.
17.2. 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 5000 kg unladen mass.
18.Reference tractor
‘Reference tractor’ means a tractor whose vibration behaviour is specific
for establishing the set values for the test stand testing of a seat for a
given vibration class of tractors.
18.1. The spectral power density of the vertical acceleration at the point of the
seat attachment of the reference tractor must satisfy the conditions in
Appendices 9 and 10 to Annex II.
18.2. The reference tractor should — provided the requirements of 18.1 are
complied with — meet the requirements set out in the following table:
Class I Class II Tolerances (1)
Unladen mass in kg 3 040 4750 ± 5 %
— front axle in kg 1 300 1830 ± 5 %— rear axle in kg 1 740 2920 ± 5 %Front tyres 7·50-18 12·4/11-28Rear tyres 16·9/14-34 16·9/14-38Front tyre pressure in bar (
2) 2·0 1·5 + 0·1 bar
Rear tyre pressure in bar (2) 1·1 1·3 + 0·1 bar
Wheelbase in mm 2 125 2590 ± 10 %
(1) These tolerances may only be exceeded when it is necessary to meet the requirement specified in 18.1.
(2) These values are applicable to diagonal-ply tyres; if radial-ply tyres are used, the pressure must be
increased by 15 %.1978L0764 — EN — 01.01.1981 — 001.001 — 6
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19.CategoryBtractor
‘Category B tractor’ means a tractor whose characteristics are such that it
cannot be included in a class in category A.
20.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:
20.1. dimensions;
20.2. position and inclination of the backrest;
20.3. inclination of the seat surface;20.4. longitudinal and vertical adjustment of the seat.1978L0764 — EN — 01.01.1981 — 001.001 — 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 withth is 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 withth e 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: + 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.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, locked in a position, locked in a position parallel withth e
median longitudinal plane of the tractor.
1.9. The seat undergoing the above tests must possess the same charac-
teristics withrespect to construction and fittings as th e 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.
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.1978L0764 — EN — 01.01.1981 — 001.001 — 8
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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 the width of the surface of seats intended for tractors
in which the rear wheel track width does not exceed 1 150 mm may
be reduced if the construction of the tractor does not enable the
requirements of 2.1.1 and 2.1.2 to be complied with, namely, not
more than 300 mm for the depth and not more than 400 mm for
the width.
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 towards the rear (see 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 by a
minimum distance of:
— 150 mm for tractors with a rear wheel track width of more than
1 150 mm,
— 60 mm for tractors witha rear wh eel track widthof 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 tractors with a rear wheel track width of more than
1 150 mm,
— 30 mm for tractors witha rear wh eel track widthof 1 150 mm
or less.1978L0764 — EN — 01.01.1981 — 001.001 — 9
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2.5.Seattests
2.5.1. Test to determine the suspension characteristics and the range of
adjustment to the driver's mass
2.5.1.1. The suspension system characteristics are determined by a static
test. This must be carried out with the seat adjusted to accommodate
a driver of a mass of 50 kg and one of a mass of 120 kg.
The limits of the range of adjustment of the seat to the driver's mass
are calculated from the suspension system characteristics.
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 means of a special device; this
load must not differ by more than 5 N from the nominal load. The
depression of the suspension system must be measured with an
accuracy of not less than ± 1 mm. The load must be applied in
accordance withth e procedure laid down in section 3 of Appendix
1.1978L0764 — EN — 01.01.1981 — 001.001 — 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 depres-
sion of the suspension system is measured must not exceed 100 N;
at least eight measurement points must be plotted at approximately
equal intervals in the movement of the suspension system. The point
taken as the maximum load should either be that at which no further
spring depression can be recorded, or a load of 1500 N. After the
load has been applied or withdrawn, the vertical depression of the
suspension system must be measured 200 mm in front of the seat
reference point (S); after the 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 without fixed weight adjustment limits, the
settings are to be so selected that:
2.5.1.4.1. for the lightest driver, the seat returns to the top of the suspension
travel when the load is removed; and
2.5.1.4.2. for the heaviest driver, the load of 1 500 N just depresses the seat to
the lowest limit of the suspension travel.
2.5.1.4.3. The range of adjustment thus determined by using the loads
prescribed in 2.5.1.4.1 and 2.5.1.4.2 must be deemed greater than
the range required in 3.1.1.
2.5.1.4.4. If the seat is equipped with a progressive lower spring stop, the
lowest position of the suspension travel (see section 9 of Annex I)
may be defined as the position which the seat assumes under a load
of 1 000 N, in the setting for the lightest driver.
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 limits of the adjustment range as a function of the
driver's mass, the values of sections A and B (see Appendix 2)
established in accordance with 2.5.1.6 must be multiplied by 1·3.
2.5.2. Test to determine the lateral stability
2.5.2.1. The seat must be set for the maximum permissible driver's mass and
connected to the test stand or to the tractor in such a way that its
base plate rests on a fixed 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. Test to determine the vibration
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's seat.
The vibrations are generated by means of an electro-hydraulic
device. The set values to be used are either those specified in
Appendices 4 and 5 for the class of tractor in question, or the
double-integrated acceleration signals recorded at the seat attach-
ment of a Category B tractor moving at a speed of 12 ± 0·5 km/h
on a standard roadway as defined in 2.5.3.2.1. The vibrations must
be transmitted to a platform which roughly corresponds in its
dimensions to the driver's cab of a tractor. To generate the vibra-
tions, an uninterrupted double run of the set values or the double-
integrated acceleration signals must be used, recorded at the seat1978L0764 — EN — 01.01.1981 — 001.001 — 11
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attachment of a Category B tractor moving on a standard roadway.
The measurements must not be made during the first run of the set
values or of the acceleration signal.
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 its bearings and guides must have no more than the
technically necessary clearance. If the platform is carried on a
vibrating arm, the dimension R must be at least 2000 mm (see
Appendix 6).
The test stand must be capable of simulating sinusoidal vibrations,
as shown in Appendix 7, when a mass of 150 kg is applied.
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. The surface may be cast in smoothly
surfaced concrete, or it may be formed of wood or concrete blocks
set in a basic structure. The surface of each track strip is defined by
the ordinates of elevation in relation to a base line; these ordinates
are shown in the tables in Appendix 3. With regard to the roadway,
the elevation is defined at intervals of 16 cm along each strip.
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 must be 100 m. The measure-
ments 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 table in Appendix 3 to Annex II).
2.5.3.2.2. The vertical vibrations transmitted are determined 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 this equipment is not required. It must not carry
any ancillary equipment. Moreover, there must be no ballast on the
wheels or 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.
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-
ments are as laid 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's mass
The tests must be carried out with two drivers: one with a total
mass of 55 kg (± 10 %), of which not more than 5 kg may be1978L0764 — EN — 01.01.1981 — 001.001 — 12
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carried in a weighting belt around the body; the other with a mass
of 98 kg (± 10 %), witha maximum mass of 8 kg in th e belt.
2.5.3.3.2. Position of the accelerometer
To measure the vibrations transmitted to the driver, an acceler-
ometer is fixed on a rigid and flat plate witha 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 protective 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
natural or synthetic foam-rubber covering about 20 mm thick.
To measure the vibrations at the seat attachment, an accelerometer
must be fixed at 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 withan r.m.s. value of
0·05 m/s2, and be capable of measuring vibrations withan 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 H.
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. Vibrations of more than 10 Hz may be disregarded. It is therefore
permissible to connect upstream of the measuring instrument a
low-pass filter witha 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)
aweff¼ﬃﬃﬃﬃﬃﬃﬃ
I=Tp
¼ﬃﬃ
Ip
ﬃﬃﬃ
Tp
The overall inaccuracy in the r.m.s. value of the weighted accelera-
tion calculated in this way must be within ± 5 %.
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 withth e direct-reading vibration meter
specified in 2.5.3.3.5.
2.5.3.3.7.2. The report must give the arithmetic mean value of the corrected seat
vibration acceleration for the light driver and also the arithmetic
mean value of the corrected seat vibration acceleration for the heavy
driver. The test report must also contain the ratio of the weighted
vibration acceleration on the driver's seat to that measured at the
seat attachment. This ratio shall be given to two decimal places.1978L0764 — EN — 01.01.1981 — 001.001 — 13
▼B
2.5.3.3.7.3. The range of ambient temperature during the tests must be
measured and shown in the report.
2.5.4. Vibration tests to be carried out on tractor seats depending on 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 witha tractor of th at 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 withth e requirements of
2.5.4.2. In this case, 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 seat vibration on seats intended
for Category A tractors
2.5.5.1. The vibration behaviour of the reference tractor, which is the
critical factor in the test on the driver's seat, is defined by the spec-
tral power density of the vertical acceleration (Appendices 9 and
10) recorded at the seat attachment of the reference tractor during
a run on the standard roadway in accordance with the requirements
of 2.5.3.2.
2.5.5.2. The value awBactually present at the seat attachment during the
measurement run must be within the following ranges:
Class I reference tractors:
awB= 1·9 to 2·2 m/s2
Class II reference tractors:
awB= 1·6 to 1·8 m/s2
and must be corrected to meet the reference value of:
aw/C3B¼2/C105 m =s2for class I
aw/C3B¼1/C17m =s2for class II,
the acceleration of awsmeasured on the driver's seat being corrected
in accordance withth e relation:
aw/C3s¼awsaw/C3B
awB
2.5.5.3. In the case of the test carried out on the stand, the set value signals
for the generation of the vertical movement of the seat attachment
must have been determined by double integration of the acceleration
signals recorded at the seat attachment of the Class I or II reference
tractors being tested during a run on the standard roadway. These
set value signals are given in Appendices 4 and 5.
The test stand must be so adjusted that the seat attachment is
subjected to a weighted acceleration of:
awB= 1·9 to 2·2 m/s2
for Category A tractors in Class I, and
awB= 1·6 to 1·8 m/s2
for Category A tractors in Class II.The value a
wBactually present at the seat attachment during
measurement must be determined. In case of deviation from the
reference value of:
aw/C3B¼2/C105 m =s2for Category A tractors in Class I
aw/C3B¼1/C17m =s2for Category A tractors in Class II,
the acceleration of awsmeasured at the driver's seat being corrected
in accordance withth e following equation:1978L0764 — EN — 01.01.1981 — 001.001 — 14
▼B
aw/C3s¼awsaw/C3B
awB
2.5.5.4. For the test on the stand, the requirements of 2.5.3.1 apply, and the
vibration must be generated in accordance withth e requirements of
2.5.5.2.
For each of the two drivers referred to in 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 Annex II). At least two test
runs must be carried out. The measured values must not deviate
from the arithmetic mean by more than ± 5 %.
2.5.6. Procedure used for determining the seat vibration on seats intended
for Category B tractors
2.5.6.1. In accordance with the requirements of 2.5.4.2, the seat vibration
tests are not applicable to a group or 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 requirements of 2.5.3.2 and 2.5.3.3. In this case, the vibration
acceleration measured on the driver's seat (aws) need not be
corrected and is accordingly identical to the reference value a w/C3s:
2.5.6.3. The testing on the test stand must be carried out in association with
a standard roadway test in accordance withth e requirements of
2.5.3.1 and 2.5.3.3.
The set values for the vibration rig drive unit must be determined
by double integration of the vibratory movement acceleration signal
recorded in accordance with2.5.3.1.1.
2.5.6.4. In the determination of the set values obtained in accordance with
2.5.6.3, the weighted vibration acceleration (awp) recorded on the
test stand at the seat attachment must not deviate by more
than ± 10 % from the value (awF) recorded on the standard roadway
in accordance with the requirements of 2.5.6.3 (first paragraph). In
the event of deviation from 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 as follows:
aw/C3s¼awsawF
awp
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 %.
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.
3.2.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 eachtype of driver's seat, th e application must be accompanied
by:1978L0764 — EN — 01.01.1981 — 001.001 — 15
▼B
3.2.2.1. a brief technical description, stating in particular the type of tractor
or tractors for which it is intended;
3.2.2.2. drawings in triplicate, sufficiently 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's trade name or mark, clearly and indelibly inscribed.
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
drawings referred to in 3.2.2.2.
3.4.EECcomponenttype-approval
3.4.1. If th e seat submitted in accordance with3.2 complies withth e
requirements of 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 Germany,
2 for France,3 for Italy,4 for the Netherlands,
6 for Belgium,
11 for the United Kingdom,13 for Luxembourg,
18 for Denmark,
IRL for Ireland,
E for Greece,
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 seat is intended. This is to be shown as
follows:
— for Category A tractors in Class I: I.
— for Category A tractors in Classes I and II: I and II.
If no indication is given above the rectangle, the seat is intended 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 is given 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 — 01.01.1981 — 001.001 — 16
▼A1
▼B
▼B
Appendix 1
Methodofdeterminingtheseatreference point(S)
1. DEFINITION OF THE REFERENCE POINT (S)
‘Seat reference point’ (S) means the point of intersection 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 Figures 1 and 2, which simulates loading 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 parts of the backrest
lightly pressed tangentially against the padded backrest.
If it is not possible to determine definite tangents to eacharea of th e 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 — 01.01.1981 — 001.001 — 17
▼B
Figure 1
Devicefordeterminingtheseatreference point(S)
1978L0764 — EN — 01.01.1981 — 001.001 — 18
▼B
Figure 2
Deviceinposition
1978L0764 — EN — 01.01.1981 — 001.001 — 19
▼B
Appendix 2
Testtodeterminethecharacteristics ofthesuspensionsystem
Hysteresis curves to determine the load adjustment range (2.5.1)
1978L0764 — EN — 01.01.1981 — 001.001 — 20
▼B
Appendix 3
Testonstandardroadway
Table of elevation ordinates in relation to an arbitrary basic level defining the
surface of eachstrip of th e roadway (2.5.3.2.1)
D = distance from starting point (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
7·84 115 110
8·00 115 100
8·16 125 110
8·32 110 100
8·48 110 100
8·64 110 951978L0764 — EN — 01.01.1981 — 001.001 — 21
▼B
DLR
8·80 110 95
8·96 110 95
9·12 110 100
9·28 125 90
9·44 120 100
9·60 135 95
9·76 120 95
9·92 120 95
10·08 120 95
10·24 115 85
10·40 115 90
10·56 115 85
10·72 115 90
10·88 120 90
11·04 110 75
11·20 110 75
11·36 100 85
11·52 110 85
11·68 95 90
11·84 95 90
12·00 95 85
12·16 100 95
12·32 100 90
12·48 95 85
12·64 95 85
12·80 95 90
12·96 85 90
13·12 85 85
13·28 75 90
13·44 75 95
13·60 75 90
13·76 70 75
13·92 70 90
14·08 70 100
14·24 70 110
14·40 65 95
14·56 65 100
14·72 65 90
14·88 65 90
15·04 65 85
15·20 55 85
15·36 65 85
15·52 65 85
15·68 55 75
15·84 55 85
16·00 65 75
16·16 55 85
16·32 50 75
16·48 55 75
16·64 65 75
16·80 65 75
16·96 65 85
17·12 65 70
17·28 65 65
17·44 65 75
17·60 65 75
17·76 50 75
17·92 55 85
18·08 55 85
18·24 65 85
18·40 70 75
18·56 75 75
18·72 95 75
18·88 90 75
19·04 90 70
19·20 95 70
19·36 85 70
19·52 85 751978L0764 — EN — 01.01.1981 — 001.001 — 22
▼B
DLR
19·68 75 85
19·84 85 85
20·00 75 90
20·16 85 85
20·32 75 70
20·48 70 75
20·64 65 75
20·80 70 75
20·96 65 75
21·12 70 75
21·28 70 85
21·44 70 85
21·60 70 90
21·76 75 95
21·92 75 95
22·08 75 90
22·24 85 90
22·40 85 95
22·58 90 85
22·72 90 85
22·88 95 85
23·04 95 85
23·20 100 85
23·36 100 75
23·52 110 85
23·68 110 85
23·84 110 85
24·00 100 75
24·16 100 75
24·32 95 70
24·48 100 70
24·64 100 70
24·80 115 75
24·96 110 75
25·12 110 85
25·28 100 75
25·44 110 95
25·60 100 95
25·76 115 100
25·92 115 10026·08 110 95
26·24 115 95
26·40 110 95
26·56 100 95
26·72 100 9526·88 100 100
27·04 100 95
27·20 100 95
27·36 110 90
27·52 115 9027·68 115 85
27·84 110 90
28·00 110 85
28·16 110 85
28·32 100 8528·48 100 90
28·64 90 85
28·80 90 75
28·96 75 90
29·12 75 7529·28 75 75
29·44 70 75
29·60 75 75
29·76 75 85
29·92 85 7530·08 75 75
30·24 85 751978L0764 — EN — 01.01.1981 — 001.001 — 23
▼B
DLR
30·40 75 75
30·56 70 75
30·72 75 75
30·88 85 75
31·04 90 75
31·20 90 85
31·36 100 75
31·52 100 75
31·68 120 85
31·84 115 75
32·00 120 85
32·16 120 85
32·32 135 90
32·48 145 95
32·64 160 95
32·80 165 90
32·96 155 90
33·12 145 90
33·28 140 95
33·44 140 85
33·60 140 85
33·76 125 75
33·92 125 75
34·08 115 85
34·24 120 75
34·40 125 75
34·56 115 85
34·72 115 75
34·88 115 90
35·04 115 100
35·20 120 100
35·36 120 100
35·52 135 95
35·68 135 95
35·84 135 95
36·00 135 90
36·16 120 75
36·32 115 75
36·48 110 70
36·64 100 65
36·80 110 55
36·96 115 55
37·12 100 50
37·28 115 50
37·44 110 50
37·60 100 65
37·76 90 55
37·92 95 55
38·08 90 35
38·24 90 35
38·40 110 35
38·56 100 35
38·72 115 35
38·88 100 35
39·04 100 35
39·20 110 30
39·36 110 45
39·52 110 50
39·68 100 55
39·84 110 50
40·00 90 55
40·16 85 55
40·32 90 65
40·48 90 65
40·64 90 70
40·80 95 75
40·96 95 75
41·12 95 751978L0764 — EN — 01.01.1981 — 001.001 — 24
▼B
DLR
41·28 90 90
41·44 90 95
41·60 85 95
41·76 85 100
41·92 90 100
42·08 90 95
42·24 85 100
42·40 85 110
42·56 95 110
42·72 95 115
42·88 95 115
43·04 100 100
43·20 100 95
43·36 100 95
43·52 100 90
43·68 110 95
43·84 100 100
44·00 110 90
44·16 100 85
44·32 110 90
44·48 110 85
44·64 100 85
44·80 100 90
44·96 95 90
45·12 90 95
45·28 90 100
45·44 95 100
45·60 90 90
45·76 85 90
45·92 75 90
46·08 85 90
46·24 75 90
46·40 75 90
46·54 75 90
46·72 85 90
46·88 85 85
47·04 90 85
47·20 75 85
47·36 65 75
47·52 70 7047·68 70 75
47·84 70 75
48·00 75 85
48·16 90 95
48·32 95 9548·48 100 120
48·64 110 100
48·30 115 100
48·96 115 115
49·12 120 11549·28 120 110
49·44 115 95
49·60 115 90
49·76 115 90
49·92 110 9550·08 110 100
50·24 100 110
50·40 100 120
50·56 95 120
50·72 95 11550·88 95 120
51·04 95 120
51·20 90 135
51·36 95 125
51·52 95 12051·68 100 120
51·84 100 1201978L0764 — EN — 01.01.1981 — 001.001 — 25
▼B
DLR
52·00 100 120
52·16 100 125
52·32 110 125
52·48 110 125
52·64 100 125
52·80 100 120
52·96 100 120
53·12 110 115
53·28 100 110
53·44 110 110
53·60 95 110
53·76 95 110
53·92 100 110
54·08 95 100
54·24 100 100
54·40 100 100
54·56 100 100
54·72 95 100
54·88 100 100
55·04 100 115
55·20 110 115
55·36 100 110
55·52 110 100
55·68 100 110
55·84 100 110
56·00 100 110
56·16 95 115
56·32 90 110
56·48 95 110
56·64 95 110
56·80 90 100
56·96 100 100
57·12 100 95
57·28 95 100
57·44 100 100
57·60 95 115
57·76 85 110
57·92 90 115
58·08 90 110
58·24 90 100
58·40 85 95
58·56 90 95
58·72 85 90
58·88 90 90
59·04 90 95
59·20 90 115
59·36 90 115
59·52 90 115
59·68 85 110
59·84 75 110
60·00 90 115
60·16 90 120
60·32 90 120
60·48 90 120
60·64 95 120
60·80 95 120
60·96 90 120
61·12 90 115
61·28 95 110
61·44 95 110
61·60 100 100
61·76 110 100
61·92 100 100
62·08 100 100
62·24 95 100
62·40 95 100
62·56 95 100
62·72 90 1001978L0764 — EN — 01.01.1981 — 001.001 — 26
▼B
DLR
62·88 90 100
63·04 90 100
63·20 90 90
63·36 90 90
63·52 85 90
63·68 85 90
63·84 75 85
64·00 75 85
64·16 75 75
64·32 75 75
64·48 70 75
64·64 70 70
64·80 70 55
64·96 70 45
65·12 65 55
65·28 65 55
65·44 65 65
65·60 55 70
65·76 55 75
65·92 55 75
66·08 55 75
66·24 55 85
66·46 55 85
66·56 65 90
66·72 70 90
66·88 70 110
67·04 65 100
67·20 55 100
67·36 65 100
67·52 50 100
67·68 50 85
67·84 50 90
68·00 50 100
68·16 55 100
68·32 55 95
68·48 65 90
68·64 50 85
68·80 50 70
68·96 50 70
69·12 50 6569·28 50 55
69·44 45 50
69·60 35 50
69·76 35 55
69·92 35 6570·08 35 65
70·24 35 65
70·40 35 55
70·58 45 55
70·72 50 5570·88 50 50
71·04 50 45
71·20 50 45
71·36 50 50
71·52 45 4571·68 45 55
71·84 55 65
72·00 55 65
72·16 70 65
72·32 70 7572·48 75 85
72·64 75 85
72·80 75 90
72·96 85 95
73·12 90 10073·28 90 110
73·44 90 1151978L0764 — EN — 01.01.1981 — 001.001 — 27
▼B
DLR
73·60 90 120
73·76 90 115
73·92 90 115
74·08 110 115
74·24 100 100
74·40 100 110
74·56 100 110
74·72 95 115
74·88 95 120
75·04 95 125
75·20 95 135
75·36 100 135
75·52 100 140
75·68 100 140
75·84 100 140
76·00 110 135
76·16 100 125
76·32 100 125
76·48 100 125
76·64 110 125
76·80 115 125
76·96 120 125
77·12 120 125
77·28 120 135
77·44 110 125
77·60 100 125
77·76 120 135
77·92 120 125
78·03 120 125
78·24 115 125
78·40 115 120
78·56 115 120
78·72 110 120
78·88 100 120
79·04 100 120
79·20 95 120
79·36 95 120
79·52 95 125
79·68 95 125
79·84 100 120
80·00 95 125
80·16 95 125
80·32 95 125
80·48 100 120
80·64 100 125
80·80 100 125
80·96 110 125
81·12 115 135
81·28 110 140
81·44 115 140
81·60 110 140
81·76 115 140
81·92 110 140
82·08 110 140
82·24 110 135
82·40 110 135
82·56 100 125
87·72 110 125
82·88 110 125
83·04 100 125
83·20 100 120
83·36 100 125
83·52 100 120
83·68 100 135
83·84 95 140
84·00 100 135
84·16 110 140
84·32 110 1401978L0764 — EN — 01.01.1981 — 001.001 — 28
▼B
DLR
84·48 110 140
84·64 110 140
84·80 120 155
84·96 115 145
85·12 115 155
85·28 120 160
85·44 120 165
85·60 120 160
85·76 125 165
85·92 135 160
86·08 135 160
86·24 125 155
86·40 125 155
86·56 120 145
86·72 120 145
86·98 110 140
87·04 110 140
87·20 110 140
87·36 110 140
87·52 110 140
87·68 100 135
87·84 100 135
88·00 100 135
88·16 100 125
88·32 110 120
88·48 115 120
88·64 110 120
88·80 110 125
88·96 100 125
89·12 100 125
89·28 95 125
89·44 95 125
89·60 100 120
89·76 100 135
89·92 110 140
90·08 110 135
90·24 110 140
90·40 100 145
90·56 100 155
90·72 110 15590·88 110 155
91·04 100 155
91·20 110 155
91·36 110 160
91·52 115 16091·68 110 155
91·84 115 155
92·00 115 140
92·16 115 155
92·32 120 15592·48 125 145
92·64 125 155
92·80 125 155
92·96 120 155
93·12 120 14593·28 120 145
93·44 115 145
93·60 120 145
93·76 115 140
93·92 115 14094·08 115 140
94·24 115 140
94·40 115 140
94·56 115 140
94·72 115 13594·88 115 135
95·04 110 1351978L0764 — EN — 01.01.1981 — 001.001 — 29
▼B
DLR
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 — 01.01.1981 — 001.001 — 30
▼B
Appendix 4
Set-value signals for the test-stand testing of driver's seats for Category A
tractors inClassI(2.5.3.1.1)
PS = set point
a = amplitude of the required value signal in 10−4m,
t = measurement time in seconds
These signals are shown in the table for 701 required points.They can be stored numerically and, after passing through a low-pass filter with
a cut-off frequency of about 10 Hz and high-frequency attenuation of 12 dB/octave, they show the amplitude of the set value for the electro-hydraulically
controlled test stand. The set-value signals must be repeated without interrup-
tion.
PS Noa
10−4mt
s
0 0 000 0
1 0 344 0·04
2 0 333 0·08
3 0 272
4 0 192
5 0 127
6 0 115
7 0 169
8 0 243
9 0 298
10 0 320
11 0 270
12 0 191
13 0 124
14 0 057
15 0 027
16 0 004
17 −0013
18 −0039
19 −0055
20 −0056
21 −0059
22 −0068
23 −0104
24 −0134
25 −0147 1·0
26 −0144
27 −0143
28 −0155
29 −0179
30 −0181
31 −0155
32 −0139
33 −0141
34 −0170
35 −0221
36 −0259
37 −0281
38 −0268
39 −0258
40 −0285
41 −0348
42 −0437
43 −0509
44 −0547
45 −0562
46 −0550
47 −0550
48 −0576
49 −0622
50 −0669 2·0
51 −0689
52 −0634
53 −0542
54 −0429
55 −03141978L0764 — EN — 01.01.1981 — 001.001 — 31
▼B
PS Noa
10−4mt
s
56 −0282
57 −030858 −037359 −044660 −046961 −0465
62 −0417
63 −035264 −026265 −021166 −018067 −018268 −021069 −022270 −0210
71 −0186
72 −014173 −008874 −003375 0 000 3·076 0 00177 −004078 −009879 −0130
80 −0115
81 −006882 −003683 −003284 −005085 −005286 −003987 −001188 0 014
89 0 041
90 0 05491 0 04092 0 00693 −000094 0 02595 0 06596 0 07697 0 05498 −0016
99 −0066
100 −0048 4·0101 −0011102 0 061103 0 131104 0 168105 0 161106 0 131107 0 086
108 0 067
109 0 088110 0 110111 0 148112 0 153113 0 139114 0 119115 0 099116 0 091
117 0 078
118 0 059119 0 062120 0 072121 0 122122 0 155123 0 191124 0 184125 0 143 5·0
126 0 087
127 0 029128 0 010129 0 0251978L0764 — EN — 01.01.1981 — 001.001 — 32
▼B
PS Noa
10−4mt
s
130 0 074
131 0 106132 0 115133 0 090134 0 048135 0 038
136 0 066
137 0 116138 0 180139 0 229140 0 212141 0 157142 0 097143 0 055144 0 073
145 0 175
146 0 287147 0 380148 0 406149 0 338150 0 238 6·0151 0 151152 0 080153 0 090
154 0 146
155 0 196156 0 230157 0 222158 0 184159 0 147160 0 115161 0 114162 0 140
163 0 198
164 0 257165 0 281166 0 276167 0 236168 0 201169 0 167170 0 145171 0 135172 0 165
173 0 242
174 0 321175 0 399 7·0176 0 411177 0 373178 0 281179 0 179180 0 109181 0 094
182 0 136
183 0 206184 0 271185 0 267186 0 203187 0 091188 0 009189 0 006190 0 074
191 0 186
192 0 280193 0 342194 0 330195 0 265196 0 184197 0 118198 0 105199 0 128
200 0 174 8·0
201 0 215202 0 229203 0 2211978L0764 — EN — 01.01.1981 — 001.001 — 33
▼B
PS Noa
10−4mt
s
204 0 199
205 0 164206 0 162207 0 174208 0 210209 0 242
210 0 270
211 0 285212 0 285213 0 258214 0 223215 0 194216 0 165217 0 132218 0 106
219 0 077
220 0 065221 0 073222 0 099223 0 114224 0 111225 0 083 9·0226 0 026227 −0028
228 −0052
229 −0069230 −0077231 −0067232 −0095233 −0128234 −0137235 −0144236 −0131
237 −0155
238 −0208239 −0266240 −0285241 −0276242 −0205243 −0110244 −0020245 0 041246 0 053
247 0 020
248 0 016249 0 041250 0 090 10·0251 0 136252 0 151253 0 123254 0 070255 0 034
256 −0001
257 −0010258 −0031259 −0061260 −0086261 −0104262 −0103263 −0093264 −0074
265 −0056
266 −0039267 −0000268 0 033269 0 067270 0 097271 0 085272 0 034273 0 002
274 −0050
275 −0080 11·0276 −0096277 −01211978L0764 — EN — 01.01.1981 — 001.001 — 34
▼B
PS Noa
10−4mt
s
278 −0116
279 −0092280 −0060281 −0018282 −0011283 −0052
284 −0143
285 −0241286 −0330287 −0343288 −0298289 −0235290 −0203291 −0249292 −0356
293 −0448
294 −0486295 −0444296 −0343297 −0240298 −0215299 −0277300 −0399 12·0301 −0527
302 −0585
303 −0569304 −0479305 −0363306 −0296307 −0299308 −0374309 −0466310 −0528
311 −0520
312 −0432313 −0320314 −0244315 −0237316 −0310317 −0413318 −0462319 −0456320 −0351
321 −0181
322 −0045323 0 013324 −0037325 −0160 13·0326 −0247327 −0258328 −0187329 −0069
330 0 044
331 0 078332 0 061333 −0012334 −0102335 −0127336 −0103337 −0045338 0 039
339 0 094
340 0 107341 0 058342 −0011343 −0078344 −0093345 −0068346 −0025347 0 021
348 0 008
349 −0016350 −0038 14·0351 −00241978L0764 — EN — 01.01.1981 — 001.001 — 35
▼B
PS Noa
10−4mt
s
352 0 041
353 0 135354 0 196355 0 171356 0 053357 −0111
358 −0265
359 −0348360 −0336361 −0258362 −0155363 −0059364 −0056365 −0123366 −0187
367 −0218
368 −0136369 0 012370 0 149371 0 212372 0 153373 0 021374 −0104375 −0160 15·0
376 −0142
377 −0027378 0 099379 0 186380 0 174381 0 085382 −0031383 −0086384 −0069
385 0 012
386 0 103387 0 164388 0 129389 0 047390 −0055391 −0097392 −0056393 0 043394 0 162
395 0 220
396 0 205397 0 129398 0 053399 0 022400 0 052 16·0401 0 114402 0 175403 0 191
404 0 172
405 0 138406 0 092407 0 052408 0 051409 0 025410 0 001411 −0026412 −0065
413 −0073
414 −0038415 −0001416 0 029417 0 030418 −0005419 −0045420 −0068421 −0093
422 −0075
423 −0067424 −0051425 −0049 17·01978L0764 — EN — 01.01.1981 — 001.001 — 36
▼B
PS Noa
10−4mt
s
426 −0059
427 −0077428 −0107429 −0143430 −0141431 −0142
432 −0106
433 −0080434 −0050435 −0030436 −0014437 −0017438 −0031439 −0037440 −0068
441 −0113
442 −0167443 −0203444 −0191445 −0135446 −0047447 0 028448 0 032449 −0031
450 −0108 18·0
451 −0157452 −0155453 −0081454 −0012455 0 053456 0 085457 0 054458 0 002
459 −0026
460 −0034461 −0014462 0 031463 0 061464 0 098465 0 123466 0 103467 0 078468 0 046
469 0 042
470 0 044471 0 072472 0 109473 0 133474 0 138475 0 125 19·0476 0 095477 0 105
478 0 129
479 0 181480 0 206481 0 200482 0 168483 0 140484 0 149485 0 186486 0 237
487 0 242
488 0 207489 0 130490 0 055491 0 015492 0 014493 0 036494 0 054495 0 056
496 0 022
497 −0032498 −0076499 −01081978L0764 — EN — 01.01.1981 — 001.001 — 37
▼B
PS Noa
10−4mt
s
500 −0099 20·0
501 −0029502 0 051503 0 138504 0 199505 0 213
506 0 184
507 0 139508 0 062509 0 027510 0 030511 0 067512 0 146513 0 247514 0 314
515 0 330
516 0 289517 0 224518 0 179519 0 184520 0 216521 0 229522 0 210523 0 130
524 0 062
525 0 006 21·0526 −0004527 0 004528 0 018529 0 031530 0 020531 0 014532 −0011
533 −0022
534 −0029535 −0042536 −0066537 −0120538 −0188539 −0241540 −0252541 −0243542 −0212
543 −0183
544 −0170545 −0189546 −0233547 −0286548 −0311549 −0280550 −0215 22·0551 −0128
552 −0038
553 −0018554 −0024555 −0052556 −0055557 −0033558 0 013559 0 061560 0 079
561 0 060
562 0 024563 −0013564 −0027565 −0018566 0 011567 0 064568 0 111569 0 171
570 0 238
571 0 285572 0 295573 0 2611978L0764 — EN — 01.01.1981 — 001.001 — 38
▼B
PS Noa
10−4mt
s
574 0 201
575 0 145 23·0576 0 142577 0 163578 0 222579 0 284
580 0 334
581 0 342582 0 301583 0 240584 0 205585 0 216586 0 257587 0 326588 0 363
589 0 380
590 0 358591 0 303592 0 273593 0 341594 0 249595 0 252596 0 245597 0 244
598 0 225
599 0 212600 0 180 24·0601 0 160602 0 130603 0 118604 0 104605 0 081606 0 040
607 −0004
608 −0040609 −0057610 −0049611 −0021612 0 011613 0 033614 0 038615 0 027616 0 019
617 0 024
618 0 040619 0 069620 0 082621 0 086622 0 068623 0 056624 0 036625 0 006 25·0
626 −0015
627 −0049628 −0071629 −0075630 −0078631 −0074632 −0069633 −0094634 −0116
635 −0150
636 −0178637 −0188638 −0198639 −0194640 −0187641 −0170642 −0161643 −0154
644 −0140
645 −0115646 −0055647 0 0011978L0764 — EN — 01.01.1981 — 001.001 — 39
▼B
PS Noa
10−4mt
s
648 0 049
649 0 085
650 0 094 26·0
651 0 071
652 0 039
653 −0001
654 −0027
655 −0025
656 0 000
657 0 028
658 0 045
659 0 019
660 −0032
661 −0101
662 −0162
663 −0198
664 −0193
665 −0149
666 −0096
667 −0075
668 −0086
669 −0151
670 −0246
671 −0329
672 −0382
673 −0392
674 −0340
675 −0286 27·0
676 −0249
677 −0245
678 −0298
679 −0348
680 −0366
681 −0330
682 −0247
683 −0175
684 −0135
685 −0149
686 −0165
687 −0178
688 −0142
689 −0097
690 −0067
691 −0051
692 −0071
693 −0101
694 −0110
695 −0091
696 −0043
697 0 020
698 0 061
699 0 064
700 0 036 28·01978L0764 — EN — 01.01.1981 — 001.001 — 40
▼B
Appendix 5
Set-value signalsfor thetest standinspectionofdriver's seatsforCategory
AtractorsinClassII(2.5.3.1.1)
PS = set point
a = amplitude of the required value signal in 10−4m
t = measurement time in seconds
These signals are shown in the table for 701 set points.They can be stored numerically and, after passing through a low-pass filter with
a cut-off frequency of abour 10 Hz and high-frequency attenuation of 12 dB/octave, they show the amplitude of the set value for the electro-hydraulically
controlled test stand. The set-value signals must be repeated without interrup-
tion.
PS Noa
10−4mt
s
0 0 000 0
1 0 156 0·04
2 0 147 0·08
3 0 144
4 0 162
5 0 210
6 0 272
7 0 336
8 0 382
9 0 404
10 0 408
11 0 376
12 0 324
13 0 275
14 0 226
15 0 176
16 0 141
17 0 126
18 0 144
19 0 180
20 0 205
21 0 198
22 0 184
23 0 138
24 0 102
25 0 068 1·0
26 0 050
27 0 055
28 0 078
29 0 120
30 0 184
31 0 209
32 0 224
33 0 206
34 0 157
35 0 101
36 0 049
37 −0002
38 −0038
39 −0068
40 −0088
41 −0100
42 −0110
43 −0151
44 −0183
45 −0234
46 −0303
47 −0364
48 −0410
49 −0407
50 −0367 2·0
51 −0289
52 −0180
53 −0081
54 −0000
55 −00111978L0764 — EN — 01.01.1981 — 001.001 — 41
▼B
PS Noa
10−4mt
s
56 −0070
57 −016858 −025659 −030760 −030261 −0249
62 −0157
63 −005664 0 01365 0 04466 0 02567 −002668 −007769 −011570 −0131
71 −0102
72 −003173 0 03574 0 07875 0 057 3·076 0 00077 −006978 −012479 −0143
80 −0129
81 −009182 −004583 −000484 −000485 −001686 −004787 −008088 −0083
89 −0080
90 −006091 −002992 −001393 −000494 −003995 −010096 −017197 −021898 −0226
99 −0190
100 −0116 4·0101 −0054102 −0001103 −0001104 −0045105 −0126106 −0191107 −0223
108 −0206
109 −0168110 −0122111 −0095112 −0101113 −0114114 −0161115 −0212116 −0254
117 −0273
118 −0258119 −0211120 −0169121 −0125122 −0115123 −0127124 −0156125 −0185 5·0
126 −0232
127 −0256128 −0260129 −02601978L0764 — EN — 01.01.1981 — 001.001 — 42
▼B
PS Noa
10−4mt
s
130 −0247
131 −0228132 −0204133 −0192134 −0179135 −0144
136 −0128
137 −0117138 −0131139 −0154140 −0164141 −0160142 −0128143 −0059144 0 015
145 0 074
146 0 034147 0 042148 −0034149 −0101150 −0147 6·0151 −0141152 −0091153 −0031
154 0 017
155 0 027156 −0012157 −0058158 −0127159 −0151160 −0125161 −0049162 0 045
163 0 104
164 0 122165 0 104166 0 046167 −0018168 −0047169 −0036170 0 016171 0 145172 0 257
173 0 330
174 0 330175 0 258 7·0176 0 138177 0 034178 −0037179 −0030180 0 026181 0 141
182 0 216
183 0 243184 0 188185 0 079186 −0015187 −0047188 −0008189 0 091190 0 230
191 0 340
192 0 381193 0 332194 0 225195 0 099196 0 014197 −0012198 0 033199 0 131
200 0 247 8·0
201 0 335202 0 348203 0 3141978L0764 — EN — 01.01.1981 — 001.001 — 43
▼B
PS Noa
10−4mt
s
204 0 239
205 0 161206 0 124207 0 139208 0 218209 0 328
210 0 405
211 0 426212 0 403213 0 314214 0 191215 0 088216 0 025217 0 030218 0 087
219 0 173
220 0 240221 0 274222 0 250223 0 182224 0 077225 −0019 9·0226 −0075227 −0061
228 −0033
229 0 011230 0 042231 0 025232 −0021233 −0078234 −0142235 −0197236 −0225
237 −0217
238 −0196239 −0133240 −0038241 0 052242 0 128243 0 168244 0 164245 0 169246 0 170
247 0 188
248 0 210249 0 220250 0 210 10·0251 0 185252 0 149253 0 100254 0 057255 0 035
256 0 006
257 −0000258 0 010259 0 034260 0 047261 0 047262 0 031263 0 028264 0 036
265 0 072
266 0 125267 0 188268 0 216269 0 189270 0 119271 0 031272 −0026273 −0059
274 −0052
275 −0009 11·0276 0 039277 0 0811978L0764 — EN — 01.01.1981 — 001.001 — 44
▼B
PS Noa
10−4mt
s
278 0 107
279 0 079280 0 023281 −0044282 −0121283 −0168
284 −0172
285 −0147286 −0119287 −0114288 −0155289 −0217290 −0287291 −0243292 −0341
293 −0289
294 −0217295 −0157296 −0150297 −0193298 −0248299 −0319300 −0371 12·0301 −0378
302 −0354
303 −0309304 −0264305 −0241306 −0236307 −0264308 −0262309 −0282310 −0275
311 −0278
312 −0285313 −0302314 −0318315 −0316316 −0293317 −0238318 −0154319 −0070320 −0021
321 −0029
322 −0075323 −0138324 −0189325 −0193 13·0326 −0153327 −0095328 −0012329 0 033
330 0 069
331 0 064332 0 000333 −0074334 −0147335 −0164336 −0142337 −0067338 −0001
339 0 057
340 0 080341 0 040342 −0010343 −0096344 −0148345 −0164346 −0134347 −0060
348 0 038
349 0 136350 0 195 14·0351 0 1701978L0764 — EN — 01.01.1981 — 001.001 — 45
▼B
PS Noa
10−4mt
s
352 0 077
353 −0067354 −0212355 −0321356 −0356357 −0339
358 −0277
359 −0189360 −0119361 −0100362 −0124363 −0170 14·0364 −0193365 −0173366 −0105
367 −0000
368 0 075369 0 092370 0 074371 0 011372 −0049373 −0082374 −0076375 −0039 15·0
376 0 010
377 0 053378 0 078379 0 068380 0 033381 0 004382 −0000383 −0013384 −0003
385 0 000
386 −0001387 −0010388 −0023389 −0019390 0 014391 0 060392 0 093393 0 117394 0 137
395 0 123
396 0 098397 0 075398 0 055399 0 062400 0 087 16·0401 0 113402 0 126403 0 139
404 0 119
405 0 080406 0 023407 −0043408 −0099409 −0121410 −0090411 −0009412 0 072
413 0 120
414 0 111415 0 049416 −0021417 −0098418 −0136419 −0117420 −0072421 −0020
422 0 038
423 0 061424 0 026425 −0016 17·01978L0764 — EN — 01.01.1981 — 001.001 — 46
▼B
PS Noa
10−4mt
s
426 −0090
427 −0151
428 −0171
429 −0150
430 −0080
431 −0001
432 0 064
433 0 113
434 0 109
435 0 089
436 0 016
437 −0040
438 −0098
439 −0142
440 −0147
PS
Noa
10−4mt
s
441 −0112
442 −0028
443 0 058
444 0 118
445 0 124
446 0 080
447 0 006
448 −0052
449 −0068
450 −0050 18·0
451 −0000
452 0 063
453 0 129
454 0 155
455 0 156
456 0 111
457 0 069
458 0 049
459 0 036
460 0 056
461 0 100
462 0 143
463 0 178
464 0 193
465 0 178
466 0 136
467 0 087
468 0 050
469 0 041
470 0 067
471 0 117
472 0 165
473 0 188
474 0 178
475 0 171 19·0
476 0 154
477 0 141
478 0 137
479 0 146
480 0 177
481 0 231
482 0 282
483 0 314
484 0 287
485 0 222
486 0 138
487 0 050
488 −0003
489 0 001
490 0 041
491 0 095
492 0 124
493 0 112
494 0 0601978L0764 — EN — 01.01.1981 — 001.001 — 47
▼B
PS
Noa
10−4mt
s
495 −0022
496 −0112497 −0161498 −0153499 −0087500 0 030 20·0
501 0 127
502 0 197503 0 203504 0 147505 0 060506 −0027507 −0103508 −0096509 −0026
510 0 062
511 0 198512 0 275513 0 293514 0 244515 0 149516 0 056517 0 005518 −0001
519 0 023
520 0 035521 0 063522 0 034523 −0009524 −0074525 −0154 21·0526 −0203527 −0204
528 −0167
529 −0119530 −0077531 −0068532 −0094533 −0168534 −0254535 −0337536 −0383537 −0400
538 −0391
539 −0365540 −0346541 −0342542 −0372543 −0398544 −0431545 −0464546 −0459
547 −0425
548 −0354549 −0259550 −0187 22·0551 −0174552 −0182553 −0211554 −0241555 −0228
556 −0192
557 −0131558 −0066559 −0050560 −0065561 −0117562 −0164563 −0191564 −0165
565 −0109
566 −0025567 0 081568 0 1631978L0764 — EN — 01.01.1981 — 001.001 — 48
▼B
PS
Noa
10−4mt
s
569 0 191
570 0 164571 0 089572 −0004573 −0075574 −0099
575 −0054 23·0
576 0 024577 0 126578 0 203579 0 223580 0 200581 0 113582 0 026583 −0008
584 −0003
585 0 057586 0 149587 0 236588 0 290589 0 299590 0 244591 0 192592 0 145
593 0 095
594 0 090595 0 111596 0 151597 0 186598 0 185599 0 165600 0 120 24·0601 0 057
602 0 008
603 −0022604 −0044605 −0062606 −0070607 −0061608 −0057609 −0044610 −0040611 −0037
612 −0028
613 −0017614 −0006615 0 011616 0 032617 0 045618 0 050619 0 039620 0 036
621 0 027
622 0 025623 0 006624 0 000625 −0012 25·0626 −0040627 −0047628 −0058629 −0070
630 −0076
631 −0098632 −0103633 −0127634 −0158635 −0158636 −0163637 −0182638 −0177
639 −0184
640 −0201641 −0199642 −01871978L0764 — EN — 01.01.1981 — 001.001 — 49
▼B
PS
Noa
10−4mt
s
643 −0145
644 −0092
645 −0040
646 0 017
647 0 044
648 0 061
649 0 029
650 −0018 26·0
651 −0078
652 −0129
653 −0135
654 −0110
655 −0039
656 0 008
657 0 019
658 −0033
659 −0102
660 −0194
661 −0264
662 −0292
663 −0261
664 −0210
665 −0147
666 −0092
667 −0089
668 −0138
669 −0248
670 −0360
671 −0455
672 −0497
673 −0473
674 −0393
675 −0294 27·0
676 −0230
677 −0214
678 −0241
679 −0294
680 −0343
681 −0375
682 −0379
683 −0349
684 −0276
685 −0202
686 −0136
687 −0099
688 −0101
689 −0139
690 −0196
691 −0246
692 −0256
693 −0234
694 −0156
695 −0078
696 0 015
697 0 083
698 0 118
699 0 080
700 0 000 28·01978L0764 — EN — 01.01.1981 — 001.001 — 50
▼B
Appendix 6
Teststand(2.5.3.1)
1978L0764 — EN — 01.01.1981 — 001.001 — 51
▼B
Appendix 7
Travelofthevibrationteststand(2.5.3.1)
1978L0764 — EN — 01.01.1981 — 001.001 — 52
▼B
Appendix 8
Characteristic ofthefilter ofthevibrationmeasuringinstrument(2.5.3.3.5)
1978L0764 — EN — 01.01.1981 — 001.001 — 53
▼B
Appendix 9
Spectral power density of the vertical vibration acceleration at the seat
attachmentoftheClassIreference tractor(2.5.5)
The spectral power density of the vertical vibration acceleration at the seat
attachment of the Class I reference tractor can be approximately expressed by
the following relation:
Φ¼Φmaxexp/C0f/C0fm ðÞ2
2b2
where the constants have the values:
Φmax= 6·0 (m/s2)2/Hz
fm= 3·25 Hz
b = 0·33 Hz
The permitted tolerances are:
Φmax= ± 10 %
fm=±5%
The tolerance with respect to b is determined by the fact that, in accordance
with 2.5.5.2, the weighted vibration acceleration at the seat attachment must be
within the limits:
aw= 1·9 to 2·2 m/s21978L0764 — EN — 01.01.1981 — 001.001 — 54
▼B
Spectralpowerdensity Φ(f)
Approximate function for the spectral power density of the vertical vibration
acceleration at the seat attachment of the Class I reference tractor
Spectral power density Φ(f)
m
s2/C16/C172
Hz
1978L0764 — EN — 01.01.1981 — 001.001 — 55
▼B
Appendix 10
Spectral power density of the vertical vibration acceleration at the seat
attachmentoftheClassIIreference tractor(2.5.5)
The spectral power density of the vertical vibration acceleration at the seat
attachment of the Class II reference tractor can be approximately described by
the following relation:
Φ¼Φmaxexp/C0f/C0fm ðÞ2
2b2
where the constants have the values:
Φmax= 5·5(m/s2)2/Hz
fm= 2·65 Hz
b = 0·3 Hz
The permitted tolerances are:
Φmax= ± 10 %
fm=±5%
The tolerance with respect to b is determined by the fact that, in accordance
with 2.5.5.2, the weighted vibration acceleration at the seat attachment must be
within the limits:
aw= 1·6 to 1·8 m/s21978L0764 — EN — 01.01.1981 — 001.001 — 56
▼B
Spectralpowerdensity Φ(f)
Approximate function for the spectral power density of the vertical vibration
acceleration at the seat attachment of the Class II reference tractor
Spectral power density Φ(f)
m
s2/C16/C172
Hz
1978L0764 — EN — 01.01.1981 — 001.001 — 57
▼B
Appendix 11
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 — 01.01.1981 — 001.001 — 58
▼B
ANNEX III
MODELEECCOMPONENTTYPE-APPROVALCERTIFICATE
1978L0764 — EN — 01.01.1981 — 001.001 — 59
▼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 withth e 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 various controls of 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 withth e 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 sucha manner as to comply withth e installation require-
ments in this Annex.
3. Seats intended for tractors with a rear wheel track of 1 150 mm may have
the following minimum dimensions with respect to the depth and width
of the seat surface:
— depthof seat surface: 300 mm,
— widthof 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 observed on grounds relating to the construction
of 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 — 01.01.1981 — 001.001 — 60
▼B
ANNEX V
ANNEX TO THE EEC TYPE-APPROVAL CERTIFICATE FOR A TRACTOR WITH
REGARDTOTHEDRIVER'SSEAT
(Articles 4 (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 — 01.01.1981 — 001.001 — 61