What oil is added to the hydraulic pump? Comprehensive analysis of hydraulic oil selection and common problems
As the core component of the hydraulic system, the hydraulic pump is inseparable from suitable hydraulic oil for its normal operation. This article will combine recent hot topics and technical discussions to provide you with a detailed analysis of what oil should be added to the hydraulic pump and provide structured data reference.
1. Recent hot topics related to hydraulic oil (last 10 days)
| topic | heat index | Main discussion points |
|---|---|---|
| Hydraulic oil winter selection | 85 | Low temperature fluidity, antifreeze performance |
| Environmentally friendly hydraulic oil | 78 | Biodegradability, environmental certification |
| Hydraulic oil mixing problem | 92 | Compatibility, performance impact |
| Synthetic Hydraulic Oil Advantages | 76 | Service life, high temperature performance |
2. Commonly used oil types for hydraulic pumps
The oils used in hydraulic pumps are mainly divided into the following categories:
| Oil type | Viscosity grade | Applicable temperature range | Main features |
|---|---|---|---|
| Mineral oil type hydraulic oil | ISO VG 32/46/68 | -20℃～80℃ | Affordable and versatile |
| Anti-wear hydraulic oil (HM) | ISO VG 32/46/68 | -30℃～100℃ | Contains anti-wear additives to protect the pump body |
| Low temperature hydraulic oil (HV) | ISO VG 22/32/46 | -40℃～50℃ | Excellent low temperature fluidity |
| Synthetic hydraulic oil (HS) | ISO VG 32/46/68 | -50℃～120℃ | Good high temperature stability and long life |
3. How to correctly choose hydraulic pump oil
The following key factors need to be considered when selecting hydraulic pump oil:
1.Operating temperature range: Hydraulic oil with appropriate viscosity grade should be selected according to the equipment working environment temperature. Low-viscosity oils should be used in low-temperature environments, while high-viscosity oils are required in high-temperature environments.
2.Hydraulic pump type: Hydraulic pumps with different structures have different oil requirements. For example:
| Pump type | Recommended oil | Things to note |
|---|---|---|
| gear pump | HM32/46 | Pay attention to anti-wear performance |
| vane pump | HM32/46 | The viscosity should not be too high |
| plunger pump | HM46/68 | Requires high viscosity index oil |
3.Equipment manufacturer recommendations: Priority should be given to the oil recommendations in the equipment manual to ensure the use of hydraulic oil that meets the requirements.
4.Environmental requirements: Equipment operating in environmentally sensitive areas should consider using biodegradable hydraulic oil.
4. Frequently Asked Questions about Hydraulic Oil Use
1.Can different brands of hydraulic oil be mixed?
It is not recommended to mix hydraulic oils from different brands, even if they have the same viscosity grade. Different brands of additives may have different formulations, and mixing may result in reduced performance or precipitation.
2.How often does hydraulic oil need to be replaced?
Conventional mineral oil-type hydraulic oil is recommended to be replaced every 2,000 working hours or once a year, and synthetic oil can last up to 4,000-6,000 working hours. The actual replacement cycle should also take into account the working environment and oil test results.
3.How to judge whether the hydraulic oil needs to be replaced?
| Judgment index | normal range | Exceeding performance |
|---|---|---|
| viscosity change | Within ±10% | Liquidity changes significantly |
| Acid value | <0.5mgKOH/g | Seriously oxidized oil |
| Moisture content | <0.1% | Oil is turbid |
| pollution degree | ISO 4406 18/16/13 | Increased particulate matter |
5. The latest development trends of hydraulic oil technology
1.Long life hydraulic oil: Using advanced additive technology, the oil change cycle is extended to more than 8,000 hours.
2.Intelligent monitoring technology: Real-time monitoring of oil status through sensors to achieve on-demand maintenance.
3.Green and environmentally friendly: The market share of vegetable oil-based hydraulic oil is increasing year by year, and the biodegradation rate can reach more than 90%.
Correct selection and maintenance of hydraulic oil can not only extend the service life of the hydraulic pump, but also improve the efficiency of the system. It is recommended that users choose appropriate oil products based on actual working conditions and establish a standardized oil management system.
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