What kind of hydraulic fluid

Choose the adequate contamination control and monitoring properties to secure the lifetime of hydraulic components and fluid. Check on special requirements or regulations such as the use of fire-resistant or environmentally friendly hydraulic fluids. Often these conditions will have influence on the hydraulic fluid type. Ask Suggest a topic. Related Posts. General Industry Henry is the answer for the highest demanding hydraulics 14 June Read article.

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A ZDDP concentration of at least parts per million can be beneficial in mobile applications. If you have considered all of the above questions, it is a good idea to review the OEM's original equipment manufacturer's specifications.

However, in some applications, especially those with extremes of temperature or other unusual operating conditions, using something different than what the manufacturer recommends may increase hydraulic system performance and reliability. If you do not have the proper training to make such a decision, it's a good idea to talk with a technical specialist , preferably one that is vendor-neutral, because this will truly give you the best recommendation for your needs.

How to Combat Leaking Hydraulic Connections. Mannesmann Rexroth. We encourage you to read our updated Privacy Policy Hide. Toggle navigation Toggle search. Magazine Subscribe Today! Current Issue Archive Advertise. What is the Right Viscosity Grade? Table 1. For mobile hydraulic equipment users, this translates to reduced fuel consumption.

When to Use a Monograde Hydraulic Oil If the hydraulic system has a narrow operating temperature range and it is possible to maintain optimum fluid viscosity using a monograde oil, it is recommended not to use a multigrade for the reasons stated above. About the Author Brendan Casey. Brendan Casey has more than 20 years experience in the maintenance, repair and overhaul of mobile and industrial equipment. For more information on reducing the operating cost and increasing the Read More.

Related Articles. Liquid-cooled heat exchanger liquid to liquid. Immersion and direct circulation type chillers for hydraulic oil are also available on the market the Apiste VSC Series consists of direct circulation type chillers. Oil chillers offer the advantages that they are compact and installation is simple, so they can be introduced quickly. Direct cooling by chiller. Previous item: Cutting oils. For oil chiller product information, click here.

Customers thinking about buying an Apiste product Customers who already own an Apiste product. Precision airconditioners equipment PAU Precision air conditioner. Cooling liquid to control temperature at the manufacturing site Hydraulic oil.

Temperature control equipment. What is hydraulic oil? The role of hydraulic oil Hydraulic pumps, hydraulic actuators, electromagnetic valves, etc. It should have a suitable viscosity and the viscosity should not change much with changes in temperature lubricity and wear resistance. It should not corrode metal and should have a rust prevention effect. It should not affect the materials used in the hydraulic device's parts rubber, coatings, etc. It should not oxidize even at high temperatures. It should not compress.

It should be highly water-separable low emulsifiability, lower specific gravity than water Moisture mixing with the hydraulic oil harms the non-compressibility of the hydraulic oil and its rust prevention and lubricating characteristics. It should be fire resistant. Types of hydraulic oils There are three main types of hydraulic oils, as described below. General hydraulic oils These are designated hydraulic oils used in general hydraulic devices. Abrasion resistant hydraulic oils These are designated hydraulic oils that are suited for high pressure, high speed hydraulic devices.

Fire resistant hydraulic oils These are hydraulic oils used in hydraulic systems in which general petroleum base hydraulic oil risks igniting and causing fires. Types and characteristics of fire resistant hydraulic oils One problem of hydraulic oil is that it can burn. Table 1 - Classification of fire resistant hydraulic oils With phosphate-ester oils, it is necessary to check whether the seals and packings in the hydraulic cycle are compatible.

Why hydraulic oils must be cooled The power source for operating hydraulic actuators is a motor. Most of the power of the motor is transmitted as motion or force for operating the actuators, but part of it is lost as heat which increases the temperature of the oil. As shown on the diagram below, the major source of heat is friction in the pump and piping.