Hydraulic Fluid

(redirected from Hydraulic oil)
Also found in: Acronyms.

hydraulic fluid

[hī′drȯ·lik ′flü·əd]
A low-viscosity fluid used in operating a hydraulic mechanism.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Hydraulic Fluid


a fluid used in machines and mechanisms to transmit forces. Hydraulic fluids should have a high resistance to oxidation, low frothing, inertness with respect to materials in the components of hydraulic systems, a flat viscosity curve, a low freezing point, and a high flash point. The petrochemical industry produces over 20 kinds of oils that are used in hydraulic systems (see Table 1).

Certain industrial and motor oils are utilized in a number of cases as hydraulic fluids. The majority of hydraulic fluids contain antioxidants, antifoamants, and other additives.


Nefteprodukty: Spravochnik. Edited by B. V. Losikov. Moscow, 1966.
Motornye i reaktivnye masla i zhidkosti, 4th ed. Edited by K. K. Papok and E. G. Semenido. [Moscow, 1964.]


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
As a result of the test at EVCO, Mobil DTE 10 Excel is believed to be the first hydraulic oil to qualify as an energy-efficient technology under a statewide incentive program.
The new Mobilcut series, alongside proven products such as Mobilmet neat cutting oils, Mobil DTE hydraulic oils and Mobil Vactra slideway oils, are in use at the McLaren Technology Centre in Woking, helping the team to realise new component designs and machine new metals and compounds.
The daily quoted its news sources as saying that MAS does not use the brand of hydraulic oil found, which is used by most foreign airlines.
I have to dispose of several hundred gallons of old hydraulic oil Now, instead of hazardous waste, I have heating oil for my shop!
The handler's monitoring system checks coolant, hydraulic oil, engine oil, and air-filter status, alerting the operator to areas requiring attention.
Features include the hydraulic digging chain drive, a hydraulic oil cooler that requires less hydraulic fluid and a direct drive (not electric) hydraulic cooling fan.
To raise the capsule through the water, pumps shift about a cup of hydraulic oil from a reservoir in the cylinder to a small external bladder.
diameter bore model is capable of displacing 0.60 cu.in./rev of hydraulic oil and the 1.063 in.
[check] The viscosity of the hydraulic oil is incorrect.
The manufacturer's latest model, which includes automatic hydraulic brakes and a built-in hydraulic oil cooler, has been designed to offer an extended lifetime in tough operating conditions.