Standard No.:	GB/T 3142-1982
English Name:	Lubricants;Determination of load carrying capacity(four balls method)
Chinese Name:	润滑剂承载能力测定法(四球法)
Chinese Classification:	E34    Lubricating oil
Professional Classification:	GB    National Standard
Issued by:	National Standards Bureau
Issued on:	1982-7-20
Implemented on:	1983-3-1
Status:	superseded
Superseded by:	GB/T 3142-2019 Standard test method for determination of load-carrying capacity of lubricants-Four-ball method
Superseded on:	2019-10-1
Superseding:	SY 2665-1977
Language:	English
File Format:	PDF
Word Count:	5000 words
Price(USD):	120.0
Delivery:	via email in 1 business day

1 Summary of Test Method The four steel balls in the four-ball tester are arranged as equilateral tetrahedron. The upper ball rotates under 1400~1500shift/min. The three balls at the lower place shall be fixed together with an oil box, in this way, the steel balls are applied with load from bottom to top by means of lever or hydraulic system. During the test process, the contact points of four steel balls shall be immersed in the lubricant. The wear scar diameter of all balls in the oil box shall be measured after the test which lasts 10 seconds for each. The test shall be repeated according to specified procedures till the assessment index of load-carrying capacity of representative lubricant is worked out.

Contents 1 Summary of Test Method 2 Definitions 3 Apparatus and Materials 4 Reagents 5 Preparation Works 6 Test Procedures 7 Calculation and Report 8 Precision Appendix A Accuracy Inspection for Four-ball Tester (Additional) Appendix B Determination Method Example for Load-carrying Capacity of Lubricant (Informative) Additional Explanation