1、BRITISH STANDARD BS4742-6: 1988 Hydraulic equipment for agricultural machinery Part6: Specification for dimensions and location of agricultural tractor hydraulic return to sump porting UDC 631.372:629.114.2578.4BS4742-6:1988 This British Standard, having been prepared under the directionof the Agric
2、ultural Machinery and Implements Standards Committee, was published under the authority ofthe Board of BSI and comes intoeffect on 31August1988 BSI10-1999 The following BSI references relate to the work on this standard: Committee reference AGE/25 Draft for comment87/70762 DC ISBN 0 580 16656 2 Comm
3、ittees responsible for this British Standard The preparation of this British Standard was entrusted by the Agricultural Machinery and Implements Standards Committee (AGE/-) to Technical Committee AGE/25, upon which the following bodies were represented: AFRC Institute of Engineering Research Agricul
4、tural Engineers Association British Fluid Power Association Local Authority Organizations National Farmers Union Amendments issued since publication Amd. No. Date of issue CommentsBS4742-6:1988 BSI 10-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions
5、1 3 Dimensions 1 4 Performance 2 Figure 1 Basic dimensions for port connection and stud coupling 1 Figure 2 Dimensions of the zone of clearance around the port connection 3 Figure 3 The location of the port connection on tractor 4 Table 1 Basic dimensions for port connection and stud coupling 2 Publ
6、ications referred to Inside back coverBS4742-6:1988 ii BSI 10-1999 Foreword This Part of BS4742 has been prepared under the direction of the Agricultural Machinery and Implements Standards Committee. Increasingly hydraulic motors and other external hydraulic services are being used with agricultural
7、 equipment having a tractor external hydraulic power source which is provided with a low pressure hydraulic return to sump port connection to the agricultural tractor. This Part of BS4742 specifies the performance, dimensions and location for such hydraulic return to sump porting. A British Standard
8、 does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an
9、inside front cover, pagesi andii, pages1 to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS4742-6:1988 BSI 10-1999 1 1 Scope This Part of
10、BS4742 specifies the requirements for location, dimensions, zone of clearance and performance of the low pressure return to sump port connection on agricultural tractors for use with agricultural equipment incorporating hydraulic equipment powered from a tractor external hydraulic service. The low p
11、ressure return connection is intended for use in conjunction with external systems which require minimal return to sump oil flow restriction, for example, hydraulic motors. NOTEThe titles of the publications referred to in this Part of BS4742 are listed on the inside back cover. 2 Definitions For th
12、e purposes of this Part of BS4742, the following definitions apply. 2.1 sump the tractor void, typically the rear axle housing, which serves as the reservoir from which the hydraulic power source draws hydraulic fluid 2.2 external hydraulic service a source of hydraulic power, derived from the hydra
13、ulic system of an agricultural tractor, available for use on equipment mounted on, coupled to, or otherwise used in conjunction with the agricultural tractor 3 Dimensions 3.1 The basic dimensions of the stud coupling and of the port connection after plating shall be in accordance with Table 1 and Fi
14、gure 1. Thread designation G 1 / 2shall be used for oil flows up to30L/min and G 3 / 4for oil flows from30L/min to80L/min. 3.2 The zone of clearance of the port connection shall be as shown in Figure 2. 3.3 The location of the port connection on the agricultural tractor shall be as shown in Figure 3
15、. NOTEReference should be made to BS5380 for enlarged details for thread undercut and seal recess. Figure 1 Basic dimensions for port connection and stud couplingBS4742-6:1988 2 BSI 10-1999 Table 1 Basic dimensions for port connection and stud coupling (seealso Figure 1) 4 Performance Where connecte
16、d to external hydraulic equipment and with the tractor hydraulic system operating, the pressure at the return to sump connection port shall not exceed0.25bar 1)when no hydraulic oil flow is occurring. The resistance to return oil flow shall not exceed1.0bar at a flow of80L/min forG 3 / 4size and30L/
17、min for G 1 / 2size at15 C to20 C with oil viscosity rating as specified by the manufacturer of the agricultural tractor. Thread designation d 1 Thread length L 1(stud) max. L 2(port) min. Counterbore ? D 1 min. h 1max. (seenote3) h 2min. Spigot ? D 2max. G 1 / 2 G 3 / 4 mm 15.0 16.3 mm 27 33 mm 0.8
18、 1.1 mm 2.5 2.5 mm 26 32 NOTE 1The maximum bore d 1is that bore specified in the relevant Part of BS4368 or BS5200. NOTE 2Details of thread runouts are given in BS1936. NOTE 3Counterbore ? D 1may be a spotface if desired. NOTE 4Thread designations are taken from BS5380. 1) 1bar =100kPa=0.1MPa.BS4742
19、-6:1988 BSI 10-1999 3 Figure 2 Dimensions of the zone of clearance around the port connectionBS 4742-6:1988 4 BSI 10-1999 Figure 3 The location of the port connection on tractorBS4742-6:1988 BSI 10-1999 Publications referred to BS1936, Specification for undercuts and runouts for screw threads. BS193
20、6-2, ISO metric screw threads. BS4368, Compression couplings for tubes. BS4368-1, Specification for heavy series couplings (metric). BS5200, Specification for dimensions of hydraulic connectors and adaptors. BS5380, Specification for hydraulic port and stud coupling using “O”-ring sealing and “G” se
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