Asked by: Ashot Frierdich
automotive auto parts

Are there different types of hydraulic fluid?

Last Updated: 4th June, 2020

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Most hydraulic systems will operate using a variety of fluids. These include multigrade engine oil, automatic transmission fluid and more conventional antiwear hydraulic oil.

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Considering this, what are the different types of hydraulic fluid?

Most are mineral oil or silicone based fluids, while some use automatic transmission fluid, made from synthetic base oil.

Subsequently, question is, what are the three types of hydraulic fluid? Three common varieties of hydraulic fluids found on the market today are petroleum-based, water-based and synthetics.

  • Petroleum-based or mineral-based fluids are the most widely used fluids today.
  • Water-based fluids are used for fire-resistance due to their high-water content.

In this regard, how many types of hydraulic oil are there?

3 types

Is there a difference between hydraulic oil and hydraulic fluid?

Hydraulic oil and hydraulic fluid are terms that are sometimes used interchangeably, but they are not necessarily the same. While hydraulic oil is a fluid, hydraulic fluid can also consist of other fluids, including plain water, water-oil emulsions and salt solutions.

Related Question Answers

Ene Mallorqui

Professional

What can I use instead of hydraulic fluid?

Light weight motor oils or machine oil (10/20W) could be used as a substitute for hydraulic oil. I do not have direct experience with this but I believe that vegetable oils are used as hydraulic fluid in food proccessing applications where contamination is a concern.

Wandifa Yves

Professional

What is the difference between ISO and AW hydraulic oil?

R&O stands for rust and oxidation - mineral oils with improved anti-rust and anti-oxidation properties. The ISO classification for these oils is HL. AW stands for anti-wear - R&O oils with an anti-wear additive package. The ISO classification for these oils is HM.

Chery Yalovoi

Professional

What is the difference between ISO 32 and ISO 46 hydraulic oil?

SAE 10W is equivalent to ISO 32, SAE 20 is equivalent to ISO 46 and 68, and SAE 30 is equivalent to ISO 100. As you can see, there is a bit of a difference between ISO 68 and SAE 30. The viscosity of the fluid largely determines the oil temperatures within which the hydraulic system can safely operate.

Smart Lindenkreuz

Explainer

Is hydraulic fluid and transmission fluid the same?

Transmission fluid is a type of hydraulic fluid. The transmission fluid is a medium that transmits power from the engine to the transmission. Other types of hydraulic fluid include mulitgrade engine oil and conventional, antiwear hydraulic oil.

Hosni Chic

Explainer

Can I use ATF instead of hydraulic fluid?

However, ATF is closer in quality to synthetic hydraulic fluid, and with this consideration, ATF can be seen as fairly reasonable in price. Also, many companies with large vehicle fleets stock bulk ATF purchased at reduced prices, allowing them to use one fluid for both applications.

Banesa Astiasaran

Explainer

Can hydraulic oil catch fire?

How to prevent hydraulic oil fires. 09 April 2013 Hydraulic oils are not generally considered a serious fire hazard, because they have high ignition temperatures. On factory premises, such a conflagration will unavoidably reach cables or other combustible material, which will catch fire and be rapidly destroyed.

Rodrigo Holzmuller

Pundit

Eneriz Dion

Pundit

Can I use power steering fluid in a hydraulic jack?

The automatic transmission is a hydraulic circuit, albeit a complex circuit, but it still has a pump and valves and pistons just the same as your hydraulic jack does. Power steering fluid is a good choice because it is a hydraulic fluid. If your jack needs fluid you may have a Pso problem.

Hatim Corcino

Pundit

Is it OK to mix hydraulic oil?

"Is it all right to mix an R&O hydraulic oil with an AW hydraulic oil in a hydraulic application?" Mixing oils with different additive packages is never recommended. Doing so could compromise the additive performance of both constituents, cause corrosion of component surfaces and lead to increased mechanical wear.

Lesya Torta

Pundit

What color is hydraulic fluid?

Any colored hydraulic system components are generally purple (like the fluid). The lines themselves can be labeled, but the standard for hydraulic lines is blue and yellow.

Rababe Ebertz

Pundit

Is Jack oil the same as hydraulic oil?

The stuff packaged as hydraulic jack oil is low viscosity. A lot of tractor hydraulics and some heavier earthmoving stuff uses hydraulic oil thats essentially the same viscosity as 10W motor oil. Jack oil looks about the same. The main thing is DON'T use brake fluid.

Bryam Argaluza

Teacher

How do I choose hydraulic fluid?

Selecting the best hydraulic fluid requires an understanding of each fluid's characteristics, including thermal stability, hydrolytic stability, low chemical corrosiveness, high anti-wear characteristics, low tendency to cavitate, long life, total water rejection, constant viscosity, regardless of temperature, and low

Antenor Nyenhaus

Teacher

What is AW 32 hydraulic oil used for?

AW Hydraulic Oil (ISO: 32, 46, 68, 100)
AW Hydraulic Oil is premium grade oil designed for use in all hydraulic systems where anti-wear hydraulic oil is recommended. All grades are rust and oxidation inhibited and contain an effective anti-wear additive and anti-foam additives to release entrained air rapidly.

Carmella Peixinho

Teacher

What is the density of hydraulic fluid?

Hydraulic oil, or hydraulic fluid, is available in many varieties with differing chemistries. Their densities range from 0.8 grams per milliliter (g/ml) up to about 1.0 g/ml.

Capitulina Honore

Teacher

What does HLP stand for in hydraulic oil?

Hydraulic fluids based on mineral oils and related hydrocarbons (HL- fluids can be used in hydraulic systems that do not pose any requirements as to wear protection, HLP- fluids (DIN 51524-2) are suitable for most fields of application and components provided the temperature and viscosity provisions are observed, HLPD

Xufeng Ermoso

Reviewer

Can water be used as hydraulic fluid?

The low boiling point and freezing point of water is another drawback of using water as a hydraulic fluid. In addition to the other answers, water is commonly used as a primary working fluid in industrial hydraulic systems with additives to prevent the issues mentioned above. So boiling and freezing are non-issues.

Wiktor Mayobre

Reviewer

What is the weight of hydraulic oil?

Viscosity is also most often expressed as the fluids ISO number or grade. Common ISO grades for use with hydraulic systems include 32, 46 and 68. Sometimes, 10, or 10 weight is mentioned as well.

Lovella Imorde

Reviewer

Can you use transmission fluid for hydraulic oil?

Most automatic transmission systems use automatic transmission fluid (ATF) as a hydraulic fluid, as well as a gear lubricant. Gear oils are typically less viscous than ATFs and operate at lower temperatures.

Michela Pallerinhas

Reviewer

What do the numbers on hydraulic fluid mean?

Here at Gerrard Hydraulics, we stock and sell two grades of hydraulic oil, 46 and 68. These numbers can be thought of in this way: the lower the number, the thinner the oil and the higher the number the thicker the oil. Oil viscosity changes with temperature.