25 Micron Hydraulic Filter 5I8670 HF35519 KHJ17730 HC9901

Applications:

BOBCAT  CT 335CT 4045 HSTCT 4050 HSTCT 4058 HSTCT 440 HSTCT 445 HSTCT 450 HSTCT 4545 HSTCT 4558 HSTCT 5545 E-HSTCT 5550 E-HSTCT 5555 E-HSTCT 5558 E-HST
CASE  CX 130 B TIER 3CX 135 SR TIER 3CX 225 SRCX 230 B TIER 3CX 235 SRCX 240 B TIER 3CX 350 B NLC
CATERPILLAR  307307 B307 C/CR307 L308 C/CR308 D/CR308 E/CR311 CU311 D LRR311 F LRR312 BL312 C312 D312 D312 D312 E/LCR313 B313 F314 C/LCR314 D/LCR314 D/LCR314 D/LCR314 D

Professional 25 Micron Hydraulic Filter 5I8670 HF35519 KHJ17730 HC9901

Q: What is a hydraulic filter?

Hydraulic filter is a key device used in hydraulic systems to intercept solid particles, gum and other pollutants in oil, ensuring the service life of components and stable operation of the system. Its working principle is usually that the oil flows from the outside of the filter element to the inside , particles larger than the pores are intercepted, and clean oil flows out; When the filter element is clogged and the pressure difference is too large, the bypass valve opens to prevent the filter element from breaking or the oil supply from being interrupted.

Core Definition and Composition

• Essence: An instrument that uses porous materials, fine gaps, or magnetic adsorption principles to separate pollutants from circulating hydraulic oil.
• Structure: It mainly consists of two parts: the shell and the filter element (filter screen), some of which are equipped with differential pressure transmitters or bypass valves. Some are also in the form of filter cartridges.
• Function: To prevent impurities from causing valve core jamming, oil film damage, component wear, and oil deterioration; According to statistics, over 75% of hydraulic system failures are caused by oil contamination.

Main classification methods

1. According to the filtering principle: surface type (mesh type, wire gap type, interception surface), depth type (paper core, sintered metal, internal tortuous channel interception), spin-on type.
2. According to installation position: oil suction filter (coarse filter, anti pump cavitation), pressure pipeline filter (fine filter, protecting downstream components), return oil filter, bypass independent filtration system.

3. According to accuracy level: coarse filtration (d ≥ 0.1mm), ordinary filtration (d ≥ 0.01mm), fine filtration (d ≥ 0.005mm), and special fine filtration (d ≤ 0.001mm).

Key performance indicators

• Filtering accuracy: The minimum particle size that can be filtered out (unit: μ m or mm).
• Pollutant holding capacity: The maximum amount of impurities that can be contained before the filter element becomes clogged.
• Differential pressure characteristics: initial differential pressure and blockage limit differential pressure (requiring the cooperation of safety valves or alarm devices).
• Mechanical strength: the ability to withstand system working pressure and impact without breaking.

Q: Where is the hydraulic filter located?

The hydraulic filter has no fixed position and must be installed in the suction port, pressure pipeline, return pipeline, or bypass circulation system according to its function. ‌‌

• At the pump suction port: coarse filter to prevent large particles from entering the hydraulic pump, ensuring high flow capacity to avoid cavitation.
• Pump outlet pressure pipeline: High-pressure filter, protects downstream valves and actuators, must withstand system impact pressure.
• System Return Oil Line: The return oil filter intercepts contaminants generated by wear of components, maintaining the cleanliness of the oil in the tank.
• Dedicated Bypass Recirculation Circuit: designed for continuous purification with high cleanliness requirements, ensuring no interference with the main oil circuit operation. ‌‌

The specific location depends on the system design objectives (such as focusing on pump protection, precision component protection, or overall oil maintenance), and multiple location configurations are often combined within the same system.