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1、International Standard ( 789/ 5 0 % 4 4, ,NTERNAT,ONAL ORGANlZATlON FOR STANDARDIZATION*MEXYHAPO,3,HAR OPi-AHWAL,b,R n0 CTAH,JAPTK3AL,MWORGANlSATlON INTERNATIONALE DE NORMALISATION Agricultural tractors - Test procedures - Part 5: Partial power PTO - Non-mechanically transmitted power Tracteurs agri
2、coles - Mkthodes d essai - Partie 5: Puissance partielle de la prise de force (puissance transmise non mkaniquementl First edition - 1983-12-01 iii UDC 631.372 : 62143.018 Ref. No. IS0 789/5-1983 (E) 3 7 Descriptors : agricultural equipment, agricultural tractors, tests, power measurement, power tak
3、e-off. g s Price based on 3 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 22:39:36 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword IS0
4、ithe International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of developing International Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee h
5、as been authorized has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval be
6、fore their acceptance as International Standards by the IS0 Council. International Standard IS0 7B9/5 was developed by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, and was circulated to the member bodies in October 1982. It has been approved by the member bodie
7、s of the following countries: Australia Austria Belgium Bulgaria Czechoslovakia China Denmark Egypt, Arab Rep. of Finland France Iran Italy Korea, Dem. P. Rep. of New Zealand Poland Portugal Romania South Africa, Rep. of No member body expressed disapproval of the document. Spain Sweden Switzerland
8、Thailand Turkey United Kingdom USA USSR 0 International Organization for Standardization, 1983 0 Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 22:39:36 M
9、DTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 789/5-1983 (E) Agricultural tractors - Test procedures - Part 5: Partial power PTO - Non-mechanically transmitted power 0 Introduction IS0 789 specifies test procedures for agricultural tractors. This
10、 part of IS0 789 deals with the partial power PTO (non- mechanically transmitted power). Other parts will be as follows: Part 1 : Power tests. Part 2: Hydraulic power and lifting capacity. Part 3: Turning ability. Part 4: Exhaust smoke measurement. Part 6: Centre of gravity. Part 7: Power and torque
11、 of the drive wheels. 3.2 deviation from rated PTO speed : This is the rotational frequency per unit of time (min-l) of the PTO output shaft above or below the rated (standard) PTO rotational frequency of the system. 4 Permissible measurement tolerances Measurements shall have the tolerances as give
12、n in clause 4 of IS0 789/l. 5 General requirements 5.1 Measurements Part 8: Engine air cleaner. 5.1.1 Temperature measurement 1 Scope and field of application This part of IS0 789 specifies test procedures for determining the power available for power take-off systems on agricultural tractors, of th
13、e wheeled, track laying or semi-track laying type, in which power transmission is accomplished by means other than a direct mechanical coupling between the engine and the PTO output shaft. NOTE - For drawbar performance tests, see IS0 789/l. For specifica- tions, see IS0 500. 2 References IS0 500, A
14、gricultural tractors - Power take-off and drawbar - Specification. IS0 78911, Agmultural tractors - Test procedures - Part 7: Power tests. 3 Definitions For the purpose of this part of IS0 789, the following defini- tions apply: 3.1 non-mechanical drive system : A system which has a non-mechanical c
15、oupling between the engine and the power take-off. A fluid or electrical power transmission system is considered to be non-mechanical. A cooling component may be included. A means shall be provided for measuring the temperature(s) of any non-mechanical components which couple the engine to the PTO s
16、ystem. 5.1.2 Fuel consumption See IS0 789/l. 5.2 Specifications 5.2.1 Tractor to be tested The tractor tested shall conform to the specification in the test report and shall be used in accordance with the manufacturer s recommendations for normal operation. 5.2.2 Fuels and lubricants See IS0 789/l.
17、5.2.3 Ancillary equipment See IS0 78911. 5.2.4 Ballasting and tyre pressures See IS0 789/l. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 22:39:36 MDTNo reproduction or netwo
18、rking permitted without license from IHS -,-,- IS0 789/5-1983 (El 5.3 Tractor preparation 5.3.1 Running-in and preliminary adjustments The tractor shall be run-in prior to the test. For spark ignition engines fitted with a means for the operator to vary the ratio of the fuel/air mixture, the tests s
19、hall be carried out with the set- tings recommended for normal operation. The adjustment of the carburettor or the injection pump shall conform to the manufacturer s specification. The governor or the throttle shall be set to give maximum power at rated engine speed. 5.3.2 Operating conditions See I
20、S0 78911. 6 Test procedures 6.1 Operate the system at rated power with the tractor speed control lever at maximum position for a period sufficient to establish stabilized conditions but not less than 2 h. The PTO system will be considered stable when two consecutive temperature readings taken 10 min
21、 apart do not differ by more than 1 “ C. 6.2 Carry out maximum available PTO power test at engine rotational frequency in accordance with 6.1 for a period of 1 h. Record sufficient data as outlined in IS0 78911 and calculate the deviations in 6.2.1 and 6.2.2. 6.2.1 Record the deviation in PTO rotati
22、onal frequency (min- 1 above and below the rated (standard) PTO rotational frequency. 6.2.2 Record the deviation in (maximum and minimum) engine rotational frequency above and below the calculated average engine rotational frequency observed in 6.2. 6.2.3 Record the temperatures observed at the crit
23、ical PTO system components. 6.3 Carry out a maximum power test at the PTO power level observed in 6.2 at the lowest engine rotational frequency which will maintain the maximum available power at the rated PTO rotational frequency for a period not less than 1 h. Record re- quired data as outlined in
24、6.2. 6.4 Carry out a part (variable) load PTO power test at the engine rotational frequency determined under 6.3. The loading shall be imposed as follows: 6.4.1 6.4.2 6.4.3 85 % of torque at maximum power Zero torque One-half of 85 % of torque at maximum 6.4.4 Maximum power 6.4.5 One-quarter of 85 %
25、 of torque at maximum power 6.4.6 Three-quarters of 85 % of torque at maximum power 20 min 20 min 20 min 20 min 20 min 20 min Record data for each of the 20 min periods as outlined in 6.2. 7 Test report 7.1 Power take-off test The test report shall be in accordance with the annex. 7.2 Abnormalities
26、Any observation of abnormality made during the test shall be reported. NOTE - Data shall be considered irregular if they differ from those defined by the applicable International Standards for PTO operation. Copyright International Organization for Standardization Provided by IHS under license with
27、ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 22:39:36 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 789/5-1983 (El Annex Report form - PTO test Engine PTO rotational rotational Fuel consumption* Temperature Station Power frequency freq
28、uency Engine - baromete kW (calculated (calculated PTO cooling Wet DV pressure average) average) I/h kg/kWh kWh/l system ? * medium bulb bulb (critical) kPa min-1 min-1 T OC T Test a rated PTO rotational frequency (540 or 1 000 min-1) - Maximum speed control lever setting - 1 h Test a rated PTO rota
29、tional frequency (1 000 min-1) - Minimum speed control lever setting - 1 h Varying load test - Minimum speed control lever setting - 2 h ? Relative density and temperature of fuel used should be noted, and be in accordance with the manufacturer s recommendations. ? * Significant PTO system temperatu
30、re to be identified and recorded. Observed rotational frequency variation table max. min. max. I Full Full Full Full Minimum Minimum 85% 85% Minimum Minimum 314 x 85 % 314 x 85 % Minimum Minimum l/2 x 85% l/2 x 85% Minimum Minimum 1/4x 85% 1/4x 85% Minimum Minimum 3 Copyright International Organizat
31、ion for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 22:39:36 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under l
32、icense with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 22:39:36 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standar
33、ds 1/9972545001 Not for Resale, 04/26/2007 22:39:36 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 22:39:36 MDTNo reproduction or networking permitted without license from IHS -,-,-