1、fim Designation:D 4862-88 An American National Standard AMERICAN SOCIETY FOR TESTING AND MATERIALS 1916 Race St.,Philadelphia,Pa.19103 Reprinted from the Annual Book of ASTM Standards,Copyright ASTM If not listed in the current combined index,will appear in the next edition.Standard Test Method for
2、Evaluating Hydraulic Transmission Fluid Antiwear Properties This standard is issued under the fixed designation D 4862;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the y
3、ear of last reapproval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope 1.1 This test method covers a procedure to determine the antiwear properties of a hydraulic transmission fluid by assessing the condition of a specimen cam ring(3.1.3)used in a
4、special apparatus to test the fluid.1.2 The values stated in SI units are to be regarded as the standard.1.3 This standard-may involve hazardous materials,oper-ations,and equipment.This standard does not purport to address all o f the safety problems associated with its use.It is the responsibility
5、o f the wer o f this standard to establish appropriate safety and health practices and determine the applicability o f regulatory limitations prior to use.2.Referenced Documents 2.1 ASTM Standards:D 235 Specification for Mineral Spirits(Petroleum Spirits)(Hydrocarbon Drycleaning Solvents)2 3.Termino
6、logy 3.1 Descriptions o f Terms Specific 50 This Standard:3.1.1 grinding pattern-distinctive,wavy-lined finish of the inner surface of the pump cam ring.See Annex A 1,3.i.2 pressure plate-end plate that serves as a diffuser for fluid discharged from the ring-vane-rotor assembly.3.1.3 pump cam ring-h
7、ousing for rotating elements of the power steering pump.3.1.4 rotor-rotating element fitted with vanes.3.1.5 test power steering pump-positive-displacement vane-type pump that provides hydraulic pressure for the power steering mechanism.3.1.6 thrust plate-end plates that absorb hydraulic thrust load
8、 imposed by rotating vanes.3.1.7 vanes-rectangular paddles that fit into slots of the pump rotor to direct fluid within the cam ring.ASTM D48b2 88 m 0759510 0037753 O m 4.Summary of Test Method 4.1 The fluid is evaluated using a motor-driven power steering pump(5.1.2)at a speed of 2950 r/min,pump ou
9、tlet pressure at 5200 kPa,and pumpout fluid temperature of 145 to 150C for 50 test hours.The antiwear performance of the fluid is evaluated at the end of the test by disassembling the pump and visually inspecting it for evidence of scuffing,scoring,or chatter wear on the specimen cam ring(3.1.3).5.S
10、ignificance and Use 5.1 This test method is intended to be used to aid in determining the acceptability of a fluid for use in a transmis-sion application.5.2 This test method can also be used for other hydraulic transmission applications where fluid-related wear effects are of concern.6.Apparatus 6.
11、1 Test Stand-The test stand is built typically with welded structural steel components by the individual user and the components are assembled in accordance with Fig.1.6.2 Test Power Steering Pump-The test power steering pump shall be equipped with the following:6.2.1 Relief Valve,9300-to-10 O00 kPa
12、 and a 3.56-mm venturi3 6.2.2 The pump may be modified by replacing the drive shaft bushing with needle bearings.6.2.3 Rotating Group Assembly,a new assembly for each 6.2.4 Remove the plastic dipstick from the cap by cutting 6.3 Drive Assembly-The drive assembly shall consist of 6.3.1 Induction Moto
13、r,1 1-kW,60-Hz having a speed of 6.3.2 Pulley,mounted on the motor shaft.6.3.3 Pulley,mounted on the pump drive shaft.6.3.4 V-Belt,9.5 mm drive.6.3.5 Device(mechanical,hydraulic,or pneumatic)to 6.4 FilterYs 40 pm throwaway elements with Vitron A 6.5 Pressure Regulator,relief valve pressure regulator
14、,O to test:flush with the inside cap surface before using the test.the following:3480 r/min.provide the proper belt load during the test.SealS.14 O00 kPa range.6 Model 135 Test Power Steering Pump with 9300 to 10 o00 kPa relief,3.56 mm venturi available from Product Engineering Experimental Procurem
15、ent,Saginaw Div.,GM,3900 Holland Rd.(Plant 3),Saghaw,MI 48605,or equivalent has been found satisfactory for this purpose.4Special Test Assembly Cam Ring and Kit No.L-76707,available from Product Engineering Experimental Procurement,Saginaw Div.,GM,3900 Holland Rd.(Plant 3),Saginaw,MI48605,or equival
16、ent has been found satisfactory for this purpose,Bendix Filter No.28070-0 or No.037812-00-60 A 4471,or equivalent has been found satisfactory for this purpose.Pressure Regulator,available from Fluid Control,Inc.,Po Box 4 0,Mentor,OH,has been found satisfactory for this purpose.An equivalent may be used.T h i s test method is under the jurisdiction of ASTM Committee D-2 on Petroleum Products and Lubricants and is the direct responsibility of Subcom-mittee W2.B on Automotive Lubricants.Current edi
