The generally necessary viscosity grade for oil for most hydraulic tools, equipment, and machines is ISO-VG32, 46, and 68, which is normally depending on the machine's normal working temperature. The higher the grade, the more heat it can withstand without changing its characteristics.
There are two types of hydraulic oils: castor oil and mineral oil. Both have similar properties when it comes to lubrication and resistance to heat; they differ only in their odor and price. Castor oil is less expensive but also less durable than mineral oil. It will quickly become toxic if exposed to air or water. Mineral oil, on the other hand, is more resistant to heat and soil contamination. However, it is also more expensive than castor oil.
ISO standards define four levels of quality for hydraulic oils: first class, second class, third class, and ungraded (the lowest quality level). First class oils are suitable for use with machinery designed for maximum operating temperatures of 120 degrees Celsius. These oils have high viscosities at low temperatures and remain stable at high temperatures. They also have good oxidative stability and do not contain any sulfur compounds that might cause corrosion to metal parts.
Second class oils should be used in machinery operated between 100 and 120 degrees Celsius.
S1.53.101 (E), Table E, USS 224, David Brown. ISO 68, 100, 150, 220, 320, 460, 680, and 800 viscosity grades are available for Industrial Gear Oil. Industrial Gear Oil is a high-load-carrying, high-pressure gear oil developed with Sulfur Phosphorus additive technology. It provides longer drain intervals for your equipment and increases the life of your transmission system.
The quality of industrial gear oil varies according to its grade. The higher the grade, the better the quality. Each grade has different properties designed to fit specific applications. For example, if you plan to use the oil under extreme conditions (high temperatures, large loads), then an industrial gear oil with a high rating (such as SAE 30 or SN) will last longer and require fewer changes than if it were used regularly on ordinary machinery (SAE 20 or SN).
You should always buy industrial gear oil based on its grade, not its name. Some brands that claim to be "industrial" gear oils are actually regular engine oils with additives added to them. These products may look like industrial gear oils but they won't perform properly under these conditions. Be sure to read the label to make sure you're getting what you need.
As far as viscosity is concerned, industrial gear oils can be divided into five groups: SAE 30, SAE 40, SAE 50, SAE 60, and SN.
Organizational Standards Viscosity Grade.
This is the highest quality grade of hydraulic oil that we sell. It provides good performance under most conditions. When used as a main transmission fluid, it should be changed regularly (every 5,000 miles).
It has very high viscosity standards to meet. The different grades have different levels of viscosity based on the degree of polymerization and how many branches there are on the polyethylene molecules.
The higher the number, the more viscous the fluid will be. This means it will provide better heat protection for your transmission components.
It also works well as a gear lubricant when cooling system temperatures allow. However, if you use an anti-wear agent with it, you won't need to change the oil as often.
There are two types of hydraulic oils: synthetic and conventional. Synthetic oils are considered the best oil because they provide excellent wear resistance and can withstand extreme temperatures. They do cost more than conventional oils, but they last longer too.
Conventional oils contain only mineral ingredients and are derived from petroleum products.
The viscosities and densities of ISO- and SAE-grade oils
| ISO Grade | Equivalent SAE Grade | Viscosity |
|---|---|---|
| centiStokes | ||
| 32 | 10W | 5.4 |
| 46 | 20 | 6.8 |
| 68 | 20W | 8.7 |
According to a short Internet search, the viscosity of Hy-Tran is similar to SAE 10W30. In addition to any hydraulic fluid use, I'd use it in any non-high-temperature SAE 30 oil application. The other fluids listed here are all recommended for general industrial use.
Hy-Tran is a synthetic oil developed for use in commercial truck and tractor applications. It provides good lubrication protection and prevents corrosion when used in combination with diesel engines and transmission systems.
The hydride form of tricresyl phosphate is added to protect against oxidation. The oil also contains anti-wear additives such as zinc dithiophosphate and molybdenum disulfide. These additives provide extreme pressure and wear prevention performance under high load conditions. It also includes demulsifiers to prevent pump problems during engine shutdowns.
Hydraulic oils must be able to withstand heat without breaking down. If the oil breaks down at elevated temperatures, it will cause premature failure of the system. Hy-Tran meets this requirement because its base oil has a very high flash point (350 degrees F). This means that it will not break down or smoke at normal operating temperatures.
The oil has low vapor pressure so it does not evaporate quickly at room temperature.
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