HYDRAULIC FILTER KNOWLEDGE 

Use of Hydraulic Filters 

For the use of hydraulic filters, hydraulic oil filters such as those in the Komatsu PC200-8 hydraulic filter or the Kobelco hydraulic filter (SK200-8 hydraulic filter) and other heavy equipment used in areas with dusty machine operation, the operation of components or parts of the hydraulic system that rub against each other can generate fine metal or non-metal particles, and the hydraulic oil acts as a lubricant and cleaner. All of this mixes together and causes contamination of the oil. 

image-hydraulic-filter

In using a hydraulic filter to remove dirt from oil, the oil that becomes dirty is not only due to the factors mentioned above, but also caused by other sources due to chemical reactions in the oil resulting from the presence of water, air, heat, and pressure, which lead to sludge. 

Sludge itself does not cause abrasion, but it will coat moving parts, causing the clogging of fine channels and passages commonly referred to as orifices, and it will jam components that have very precise tolerances (such as valve spools moving within their housings) or the seating of ball or poppet valves. 

A hydraulic filter functions to separate or filter fluids (oil) from all dirt and contaminants, ensuring that the cleanliness and quality of the oil are maintained. 

Price of Hydraulic Oil Filters 

The price of hydraulic oil filters depends on the brand of the heavy equipment unit as well as the type of unit, such as the Komatsu PC200-8 hydraulic filter compared to the Kobelco hydraulic filter (SK200-8 hydraulic filter), and the prices of the hydraulic filters are also different. 

The price of oil for the hydraulic system is quite high (expensive), and in one replacement cycle it uses more oil compared to oils for other components in the engine system. Therefore, a significant amount of cost must be spent on the maintenance of the equipment and the replacement of the hydraulic oil. 

So, the overall benefit of a hydraulic filter or strainer is that it is expected to maintain the quality (cleanliness) of the oil. Damage to engine components (hydraulic system) can be minimized as much as possible, ensuring that the engine's performance remains in accordance with the manufacturer's specifications. 

Hydraulic Filter Filtration Capability 

The degree of hydraulic filter filtration capability and types of hydraulic filters. The filtration capability of a hydraulic filter is very important in a hydraulic system, as it indicates how large or small dirt particles or contaminants can be retained or filtered by the hydraulic filter. 

In general, the measurement or size used to determine the degree of a hydraulic filter's filtration capability is Micron (one-thousandth of a millimeter). Some manufacturers have specified the density or size of a material that can be filtered in microns, according to the hydraulic system designed for the respective machine. 

Based on the hydraulic filter's function as mentioned above, there are several types or kinds of filters that are associated with the size they can retain and the placement of the filter within the hydraulic system. 

Types of Hydraulic Filters 

Types of hydraulic filters, among the various kinds or types, are distinguished by what is called surface filters and depth filters. 

1. Surface Filter A surface filter is a hydraulic filter that has a single surface, which can catch and remove dirt particles that are larger than the holes of the hydraulic filter itself. The dirt is filtered and separated from the oil and held on the outer side of the filter, while clean oil continues to pass through the holes of the filter. All dirt that does not pass through the filter holes accumulates in the filter container or attaches directly to the filter, causing the filter to become clogged or blocked, which must be cleaned or replaced immediately. 

2. There are two types of surface filters, namely: Pleated Paper Filter, which is a filter made from sheets of paper that are pleated, with the paper material made from cellulose (or plant fibers) and pressed into filter paper. Because there are also differences in pressure in the system, the filter is given a frame during manufacturing. Metal Edge Filter, which is a filter that has plates shaped like rings and magnetic. When arranged in a cylindrical form with gaps, the outer part is framed with paper or wire mesh filter. Oil flows through the gaps between each plate, and fairly large dirt particles get trapped, while metal particles (in fine particle form) can be attracted by the magnets in the metal ring plates. 

Hydraulic Filter Construction 

For hydraulic filter components, most hydraulic filters are cylinder-shaped with openings for hydraulic oil input and output on opposite sides of the filter. The hydraulic oil is usually directed through channels in the filter housing and passes through the filter media. The media then collects contaminants, and the oil is cleaned as it passes through a central channel within the filter media, making its way to the output. 

Contaminants will remain trapped in the filter media. Then, when the filter reaches full capacity, a switch often triggers an LED or other visual indicator to announce that the filter is clogged and needs to be replaced with a new hydraulic filter. 

A cross-sectional image of the filter is shown below; in this case, the clogged filtering status is indicated by the position of a simple piston.

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