We use cookies

We use cookies to analyze traffic, remember preferences and improve the usability of the website. To give your consent, click on the "I Agree" button.

Settings I agree

You can refuse consent at any time.

Skip to content Skip to menu

Our company is a specialist in field of magnetic separation

We develop, produce and apply devices for magnetic separation. Our magnetic separators are designed and manufactured exactly in a made-to-measure way as per your needs.

Today

Black Particles in Hydraulic Oil: Causes, Risks and How to Remove Them Effectively

The pump makes unusual noise, the valve loses precision, the cylinder moves jerkily. The service technician replaces the worn part — and three months later the situation repeats itself.

The cause is usually still in the oil. Specifically in what cannot be seen with the naked eye.

Where do metal particles come from

A hydraulic system is an environment of constant motion, pressure and friction. Metal microparticles enter the oil mainly from three sources:

  • Component wear — piston rods, bearings and pump gears release particles of 1–50 µm in size with each working cycle.
  • Corrosion — moisture penetrating the oil through condensation or inadequate sealing creates small ferromagnetic fragments.
  • Running-in of new components — a newly installed pump or cylinder produces significantly more wear particles in the first hundreds of operating hours.

The result is oil that looks normal to the eye — but under a microscope resembles a fine abrasive grinding paste.

Why standard filtration is not enough and where a magnetic filter helps

Most hydraulic systems are equipped with mechanical filters with a nominal filtration of 10–25 µm. The most dangerous ferromagnetic particles are precisely in the range of 1–10 µm — below the capture threshold of a standard filter. They slip through, continue circulating and act as abrasive exactly where tolerances are tightest.

 

A flow-through magnetic filter installed directly in the hydraulic pipeline captures these ferromagnetic fragments directly from the flowing oil — regardless of their size. It operates continuously, without pressure loss and without electrical power.

 

Not sure which magnetic filter version is suitable for your hydraulic system? Contact us.

Top