Hydraulic fluid (HF) specifications for mobile construction equipment called JCMAS HK and HKB have been established by the Fuels and Lubricants Technical Committee of Japan Construction Mechanization Association (JCMA). The specifications are composed by two viscosity categories of single grade and multigrade. Each category has ISO VG32 and 46. The JCMAS HK oils are effective to use in hydraulic systems designed to pressurize up to 34.3MPa and to heat hydraulic fluid up to 100 degrees Celsius. These oils also provide performances for controlling wear, friction coefficient, oxidation, rust, seal swelling and filterability. Two piston pomp test procedures were developed to evaluate lubricating performance of these oils under high pressure conditions. The JACMAS HKB oils are environmental friendly oils due to the additional requirement for biodegradability.
展开▼
