HDU 15/25


HDU 15/25 PV is a fine filter for offline oil filtration in hydraulic power transmission, lubrication, cooling, and small quench-oil systems.

Particularly useful for filtering high-viscosity lubricants in gear boxes on wind turbine transmissions.

The filter is a 3-micron absolute filter with a high dirt-holding capacity and a cellulose-based filter insert that removes particles, retains oil degradation products (oxidation, resin/sludge, varnish), and absorbs dissolved/emulsified and free water from oil.
Special inserts, which do not absorb water, are available on request. 

Special Feature
Retrofit of HDU 15/25 turning it into a 
PTU 15/25

As the HDU 15/25 is designed as a modular system, it is possible to turn a HDU 15/25 into a PTU 15/25 by retrofitting the separate coalescer housing and changing the insert type to BLA 15/25. This process changes the water separation method from absorption to coalescing, which is suitable for larger amounts of water and resulting in a reduction of maintenance costs!

HDU 15/25 PV is available in one size only with one filter insert. CJC® oil maintenance systems are available in a range of design configurations including pre-heaters, drip pans, tank, control boxes, coalescers.

The HDU 15/25 PV Filter is ideal for:

  • small hydraulic power packs
  • gear boxes, in particular wind turbine transmissions 
  • tap changers 
  • injection moulding machines
  • and similar industrial and marine applications etc.
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Product Sheets



Fine Filter brochure