The choice of the right hydraulic fluid is essential to the longevity and efficiency of your machine. One of the more commonly used types you'll come across is the AW-32 and the AW-46 hydraulic oil. The main distinction between the two is the viscosity, which is what will determine their optimal operating environment and the best use for them.
Understanding the Grades: Viscosity is Key
Its "AW" in the name refers to Anti-Wear, which means that both oils have additives that protect the pumps and other hydraulic components from wear and tear. The numbers 32 and 46 32 and 46 are referring to an oil's ISO Viscosity Grade (VG). It is a measurement of the oil's kinematic viscosity as measured by centistokes (cSt) at a standard temperature of around 40C (104°F).
1. AW-32 Hydraulic Oil: The Cold-Weather Performer
A-32 can be described as the most thin among the two. The lower viscosity of AW-32 allows it to flow smoothly and quickly, particularly in colder temperatures.
Key Characteristics & Applications:
More efficient cold flow. Because of its thin structure, AW-32 provides excellent cold start capabilities, decreasing resistance while allowing for swif,t smooth operation in low-temperature conditions. It also improves the energy efficiency of cooler systems.
Maximum Temperature range It is ideal for hydraulic systems that operate in cooler temperatures, indoor applications that have steady, low temperatures (like manufacturing lines) as well as during the winter and fall season.
Common uses: Workshop equipment, machinery for manufacturing in the indoor environment, hydraulic systems in warm conditions, and equipment that operates under less load.
2. AW-46 Hydraulic Oil: The High-Heat Protector
A-46 is denser than the AW-32. The higher viscosity creates an extra-thick protection for the oil film. This is crucial when the system is heating up.
Key Characteristics & Applications:
Superior Film Strength This oil is thicker and offers better protection and lubrication against more pressures, loads, and temperatures. It's less likely to thin out when heated and prevents metal-to-metal contacts and wear.
Maximum Temperature Range: Perfect for systems that operate in warmer temperatures in the summer season, as well for applications that produce significant internal heat as a result of excessive pressure or constant use.
Common Usage: Heavy-duty mobile equipment like wheel loaders, excavators, tractors, dump trucks, is utilized in agriculture, construction and forestry. These are areas where the machinery is exposed to harsh conditions and extreme temperatures.
Always verify the recommendations of your equipment's manufacturer before you do so. They specify the appropriate ISO VG for your equipment in accordance with the design, operating pressure and expected environment. The wrong grade of viscosity as well as mixing various grades, can cause problems for your system's performance and drastically reduce its lifespan.
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