S278.7 ANSI/ASAE JUL03 (ISO 11001-1 1993) Agricultural wheeled tractors and implements -- Threepoint hitch couplers -- Part 1: U-frame coupler
S T A N D A R D
ASABE is a professional and technical organization, of members worldwide, who are dedicated to advancement of engineering applicable to agricultural, food, and biological systems. ASABE Standards are consensus documents developed and adopted by the American Society of Agricultural and Biological Engineers to meet standardization needs within the scope of the Society; principally agricultural field equipment, farmstead equipment, structures, soil and water resource management, turf and landscape equipment, forest engineering, food and process engineering, electric power applications, plant and animal environment, and waste management. NOTE: ASABE Standards, Engineering Practices, and Data are informational and advisory only. Their use by anyone engaged in industry or trade is entirely voluntary. The ASABE assumes no responsibility for results attributable to the application of ASABE Standards, Engineering Practices, and Data. Conformity does not ensure compliance with applicable ordinances, laws and regulations. Prospective users are responsible for protecting themselves against liability for infringement of patents. ASABE Standards, Engineering Practices, and Data initially approved prior to the society name change in July of 2005 are designated as `ASAE', regardless of the revision approval date. Newly developed Standards, Engineering Practices and Data approved after July of 2005 are designated as `ASABE'. Standards designated as `ANSI' are American National Standards as are all ISO adoptions published by ASABE. Adoption as an American National Standard requires verification by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by ASABE. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. CAUTION NOTICE: ASABE and ANSI standards may be revised or withdrawn at any time. Additionally, procedures of ASABE require that action be taken periodically to reaffirm, revise, or withdraw each standard. Copyright American Society of Agricultural and Biological Engineers. All rights reserved. ASABE, 2950 Niles Road, St. Joseph, MI 49085-9659, USA ph. 269-429-0300, fax [phone], [e-mail]
ANSI/ASAE S278.7 JUL03 (ISO 11001-1 1993) Approved September 2003 by American National Standards Institute
Agricultural wheeled tractors and implements -- Threepoint hitch couplers -- Part 1: U-frame coupler
Proposed by Advisory Engineering Committee of Farm and Industrial Equipment Institute; approved by ASAE Power and Machinery Division Technical Committee; adopted by ASAE December 1964; revised December 1965, June 1967; reconfirmed December 1971; revised April 1974, February 1975; corrected editorially April 1977; revised December 1978, March 1980; reconfirmed December 1984; revised editorially and reconfirmed December 1989; reaffirmed December 1994; revised editorially February 1995; reaffirmed December 1999, January 2001, December 2001, February 2003. Adoption with modification of ISO 11001-1:1993 (E) and addition of ASAE Forward with deviations July 2003. Approved by ANSI September 2003. clearance envelope in this area (the ASAE document was incomplete in this regard). The PTO to hitch dimensions are not made in the ISO document, as they are in paragraph 3.2.4 in ASAE, they are contained in the referenced ISO 730-1. 0.3 The responsible committee has reviewed the normative references listed in ISO 11001-1 and no additional documentation or deviations are required. 0.4 This standard had been approved as an American National Standard by ANSI (American National Standards Institute). ASAE technical content was provided as the original basis for this ISO standard. 0.5 ASAE technical deviations from ISO 11001-1 are: 0.5.1 Special category 3N narrow hitch coupler. The dimensions of special category 3N shall be as follows: 0.5.1.1 Dimension l1 , l3 , l4 , l5 , l6 and l7 in Table 1 shall be in accordance with Category 2. All other dimensions shall be in accordance with Category 3. 0.5.1.2 Dimensions l1 and l2 in Table 2 shall be in accordance with Category 2. All other dimensions shall be in accordance with Category 3. 0.5.2 Special category 4N narrow hitch coupler. The dimensions of special Category 4N shall be as follows: 0.5.2.1 Dimension l1 , l3 , l4 , l6 and l7 in Table 1 shall be: l1 = 925-930mm (36.42-36.61 in.) l3 = 858mm (33.78 in.) l4 = 1174mm (46.22 in.) l6 = 858mm (33.78 in.) l7 = 1174mm (46.22 in.) All other dimensions shall be in accordance with Category 4. 0.5.2.2 Dimension l1 in Table 2 shall be 919-922mm (36.18-36.30 in.). Dimension l2 in Table 2 shall be in accordance with Category 3. All other dimensions shall be in accordance with Category 4.
0 Forward
0.1 This ASAE document, ANSI/ASAE S278.7, Agricultural wheeled tractors and implements -- Three-point hitch couplers -- Part 1: U-frame coupler, is equivalent to ISO 11001-1:1993 (E) except for the technical deviations as noted in the following forward sections. These technical deviations pertain to those provisions where harmonization could not be achieved between the ASAE and the International Standard. ISO 110011:1993 does not contain some technical information that has been in the content of ASAE Standard S278. The responsible ASAE technical committee considered this information relevant and important to maintain in the document. 0.2 It has been found from experience that certain large implements used with dual rear tires and narrow crop row spacing require a special category narrow hitch. The difference between ISO 11001-1 and ASAE S278 is that the Special Hitch Coupler Categories (Category 3N and 4N) were omitted from ISO 11001-1. All the dimensions in ASAE S278.6 were exactly the same in ISO 11001-1. The ASAE Table 1 footnotes are noted in Section 4 of the ISO document. The ASAE Table 2 footnotes are listed in Section 5 of the ISO document. Dimension K1 in Table 2 of ASAE is listed in paragraph 5.4 of the ISO document. Dimension b2 shown in Table 2 of the ISO document was added to completely define the
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ANSIASAE S278.7 JUL03 ,,ISO 11001-1 1993...
ASABE STANDARDS 2006
1 Scope
This of part ISO 11001 specifies the essential dimensions for the attachment of three-point hitch implements to agricultural wheeled tractors equipped with a three-point free link hitch according to ISO 730-1, ISO 730-3 or ISO 8759-2, and a U-frame hitch coupler. NOTE 1 In general, the dimensions associated with the tractor and the implement for use with hitch couplers are the same as those for the three-point linkage specified in ISO 730-1, ISO 730-3 or ISO 8759-2, and those for the clearance zone specified in ISO 23321) . The three-point hitch coupler systems constitute a special method of implement mounting. The hitch couplers are an additional component located between the three-point linkage and the implement, making it possible to hitch and unhitch from the operator's seat. Due to the special construction and function of hitch couplers, it may be necessary to vary the length of the links indicated in the referenced standards. This part of ISO 11001 applies to Categories 2, 3 and 4 of agricultural wheeled tractors as defined in ISO 730-1 and ISO 730-3.
3 Principle of frame coupler system
A frame coupler system is a one-phase implement coupler where the three-point linkage of the tractor (see ISO 730-1, ISO 730-3 or ISO 8759-2) is fitted with a U-frame and the implement has the provisions to be mounted to the frame. Hitching and unhitching can be operated from the tractor operator's seat.
4 Coupler dimensions
Coupler dimensions shall comply with figure 1 and table 1. 4.1 The upper hook offset (dimension b5 ) shall be not more than 15,75 mm greater or 6,35 mm less than the lower socket offset (dimension b1 ) 4.2 The implement shall provide clearance when attached to the coupler to permit lowering all elements of the coupler 120,9 mm minimum for categories 2 and 3, and 146 mm minimum for category 4, to ensure satisfactory attachment and detachment of the implement from the coupler. 4.3 The upper hook of the quick coupler shall be at the centre of the lower sockets within 3 mm. 4.4 The lower implement attaching point on the quick-attaching coupler shall be located in the vertical position such that the lift range, power range and levelling adjustment, as specified in ISO 730-1 and 150 730-3, are fulfilled. 4.5 Implement components, other than the hitch pins, that are in alignment with the lower socket width (dimension 1 ) shall not extend forward of the centreline of the lower socket for a distance of 203 mm above the lower socket. Components above this height, extending laterally more than 381 mm from the coupler centreline, shall not extend more than 25 mm forward of the vertical centreline through the upper hook opening. 4.6 The lower socket width ( 1 ) shall be maintained within the area defined by dimensions b2 , h6 , h7 and b9 . 4.7 The lower link to coupler pins may be recessed to provide design freedom to obtain structural integrity in the coupler frame, resulting in a common dimension for l3 and l 6 , and l 4 and l 7 , respectively.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 11001. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 11001 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 730-1: 1990, Agricultural wheeled tractors -- Rear-mounted threepoint linkage--Part 1--Categories 1, 2 and 3. ISO 730-3: 1982, Agricultural wheeled tractors--Three-point linkage-- Part 3: Category 4. ISO 8759-2:1985, Agricultural wheeled tractors -- Front-mounted linkage and power take-off --Part 2: Front linkage.
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ISO 2332: 1983, Agricultural tractors and machinery--Connections-- Clearance zone for the three-point linkage of implement...