Welcome to visit asparagus！
Englishen
asparagus
Englishen
Current location：front page >> mechanical

What causes hydraulic oil to turn black?

2025-11-08 06:45:24 mechanical

What causes hydraulic oil to turn black?

Hydraulic oil is an indispensable working medium in the hydraulic system, and its performance directly affects the operating efficiency and life of the equipment. However, in actual use, the blackening of hydraulic oil is a common problem. This article will analyze the causes, effects and solutions of hydraulic oil turning black, and attach relevant data for reference.

1. Common causes of hydraulic oil turning black

What causes hydraulic oil to turn black?

Blackening of hydraulic oil is usually caused by the following factors:

ReasonSpecific instructions
oxidation reactionWhen hydraulic oil is exposed to high temperatures or air for a long time, it reacts with oxygen to form oxides, causing the color to darken.
contaminants mixed inImpurities such as dust, metal particles, and moisture enter the oil and accelerate the deterioration of the oil.
Additive failureThe antioxidants, anti-wear agents and other additives in the hydraulic oil are exhausted and lose their protective effect.
High temperature operationThe equipment has been overloaded for a long time and the oil temperature is too high, resulting in carbonization.

2. The impact of hydraulic oil turning black

Blackened hydraulic fluid can cause the following problems:

influenceConsequences
Decreased lubrication performanceIncrease equipment wear and shorten the life of parts.
System cloggedSediments clog filters or valves, causing hydraulic system failure.
Reduced efficiencyChanges in oil viscosity affect the power transmission effect.

3. Solutions and preventive measures

To address the problem of hydraulic oil turning black, the following measures can be taken:

measuresOperation suggestions
Change oil regularlyAccording to the equipment manual, it is recommended to replace the hydraulic oil periodically.
Enhance filteringInstall a high-precision filter element and clean the fuel tank and pipelines regularly.
Control oil temperatureAvoid long-term overload operation and install a cooling device if necessary.
Choose high quality oilChoose hydraulic oil with better oxidation resistance and thermal stability.

4. Detection standards for blackening of hydraulic oil

The following indicators can be used to determine whether the hydraulic oil needs to be replaced:

Test itemsnormal rangeabnormal behavior
ColorTransparent or light yellowdark brown or black
viscosity change rate≤10%significantly increase or decrease
Acid value (mgKOH/g)≤0.5More than 1.0

5. Summary

The blackening of hydraulic oil is the result of a combination of factors and needs to be avoided through regular maintenance and scientific management. If any abnormality in the oil is found, it should be detected and replaced in time to ensure stable operation of the hydraulic system. Reasonable selection of oil, controlling the working environment, and strengthening filtration and maintenance are the keys to extending the service life of hydraulic oil.

(The full text is about 850 words in total)

Next article
  • What about Baxi wall-hung boiler?

    check the details
    What about Baxi wall-hung boiler?
    How about Baxi wall-hung boiler? Popular topics and in-depth analysis of the past 10 days across the InternetAs winter approaches, heating equipment has become the focus of consumers' attention. As a well-known brand, Baxi wall-mounted boilers have recently seen a significant increase in discussions on social platforms and e-commerce channels. This article will combine the hot data of the entire network in the past 1
    2025-12-21 mechanical
  • What about pre-filters?

    check the details
    What about pre-filters?
    What about pre-filters? Analysis of hot topics and hot content on the entire network in the past 10 daysAs the demand for water purification increases, pre-filters, as the first line of defense for household water use, have recently become a hot topic on the Internet. This article combines popular data in the past 10 days to provide you with an in-depth analysis from dimensions such as performance, price, and install
    2025-12-19 mechanical
  • How to lay tiles on floor heating

    check the details
    How to lay tiles on floor heating
    How to lay tiles on floor heating? Comprehensive analysis of construction key points and precautionsWith the increase in heating demand in winter, floor heating systems have become the choice of many families. However, laying ceramic tiles on floor heating requires special attention to materials and workmanship to ensure heat dissipation and stability of the ceramic tiles. This article will combine the hot topics on
    2025-12-16 mechanical
  • How to choose the number of air conditioners

    check the details
    How to choose the number of air conditioners
    How to choose the number of air conditioners? 10 days of hot topic data on the entire Internet + purchasing guideRecently, as the temperature continues to rise, the purchase of air conditioners has become a hot topic across the Internet. According to social media and e-commerce platform data in the past 10 days (as of October 2023), the search volume for keywords such as air conditioner selection, energy saving, and
    2025-12-14 mechanical
Latest articles
Recommended articles
Reading rankings
Friendly links
Dividing line