The sequential four-ball wear test methodology was developed to simulate the mode of wear and lubricant failure in a full-scale 3 5VQ35 pump stand test used to predict hydraulic fluid performance in off-highway vehicles. The merits of using bench test to develop and screen lubricants, in this case hydraulic fluids, stem from the high cost of research and development prior to the acceptance of hydraulic fluids for equipment or vehicular service. To supplement previous studies on a variety of fluids, including mineral oil, water-glycol and phosphate ester-based hydraulic fluids, this study evaluates the performance of new and used fluids from pump stands and vehicles to determine the potential for extending the use of the fliuds in the system. A total of eight new (unused) fluids and six used fluids were evaluated and compared to baseline fluids. In addition to wear, scuffing loads were also evaluated. With improvement in scuffing resistance, extension of the use of the fluids from 2000 to at least 5000 hours is suggested.
|Original language||English (US)|
|Number of pages||7|
|Specialist publication||Lubrication Engineering|
|State||Published - May 1 1996|
All Science Journal Classification (ASJC) codes
- Industrial and Manufacturing Engineering