Hydraulic Oil Care in the Offline Flow, Winch | Tug Bot

Customer Case

Hydraulic system, winch

Vessel: Tug boat “BEAUFORT”, 2010 built by Damen shipyard in the Netherlands
Hydraulic oil: Shell Tellus 46
Oil volume: 1.200 Litres


High temperatures put an extreme strain on the hydraulic oil of the winches and accelerate oil ageing processes with immense consequences for the entire hydraulic system. To value the oil more precisely, an oil sample was taken and analysed by an independent laboratory. Result of the analyses: high varnish and particle content; the oil was so dirty that the exact number of particles was not countable; black filter test membrane. The hydraulic system was extremely dirty.

At that point, the Dublin Port Company had already installed a CJC® Hydraulic filter 27/108 in the offline flow on their RoRo Ferry ram hydraulic system. Because of the excellent results on the ferry, the ship owner decided to test such a CJC® filter for the tug boat’s winch hydraulic system.

hydraulic oil care in the offline flow, winch, tug boat

Tug boat “BEAUFORT”


A CJC® Hydraulic filter 27/27 was installed. The installation in the offline circuit ensures continuous fine and depth filtration, drying and care of the oil.

Filter material: 100% natural fibres
Filtration degree: 3 µm absolute, retention rate < 1 µm
Dirt holding capacity: approx. 2 kg
Water holding capacity: approx. 0.9 Litres

hydraulic oil care in the offline circuit, hydraulic filter installed at the hydraulic winch system , tug boat

CJC® Hydraulic Filter 27/27 installed at the hydraulic winch system of the tug boat.

Result with CJC® Hydraulic Filter

The oil sample, which revealed that the oil was extremely dirty, was taken in December – the oil cleanliness level according to ISO 4407 was estimated to be approx. 22/20/14. The oil was so contaminated and dark that an exact particle number was not countable and impeded the ISO Code’s classification. The CJC® Hydraulik Filter was installed shortly after the report of the laboratory. Already after the first filter pass, a second oil sample was taken – the oil cleanliness level improved to 15/14/11 (acc. to ISO 4407). Four months after the installation of the CJC® Hydraulic Filter, a further analyses was taken and documented the ISO Code 13/12/7 – perfect condition for optimum system reliability. No problems were seen on the winch system anymore. According to Noria Corporation, the estimated lifetime for hydraulic components is 10-times longer when the oil cleanliness (ISO Codes) can be improved in such impressive magnitude.

Oil samples

without care

With CJC®
after 1st filter pass

With CJC®
after 4 months

Savings & Benefits for our Customer

Due to the installation of the CJC® Hydraulic Filter, our customer obtained the following benefits:

  • Risk of losing charter reduced (coming off-hire)
  • reliable, functional winch due to a consistently clean hydraulic system — pumps, valves and pistons optimally protected
  • 10-times longer lifetime for hydraulic components possible
  • Oil change avoided, and 1,200 Litres of hydraulic oil saved
  • CO2 emissions reduced — 3,120 kg CO2 are saved per avoided oil change *)

*) The thermal disposal of waste oil causes approx. 2.6 kg CO2 per 1 Litre.

Improving the CO2 footprint

Longer oil change intervals lead to high savings and, at the same time, protect the environment and resources:

  • less fresh oil
  • less waste oil and CO2

Development of the particle content in the hydraulic system

Oil analyses by Filtrex Services, particle content in 100 ml

Zero sample
With CJC® Hydraulic filter
after 1st filter pass

With CJC® Hydraulic filter
after 4 months

Particles > 2 µm
not exactly measurable 16.780 7.804
Particles > 5 µm
not exactly measurable 10.995 2.496
Particles > 15 µm
not exactly measurable 1.950 77
ISO Code 4407 *) 22/20/14 15/14/11 13/12/7
*) Information on the determination of cleanliness classes and oil analyses available on request.

Customer comment

Technical Supervisor, Dublin Port Company:

„I would highly recommend talking to CJC! Especially if you are experiencing any oil condition problems, this system works!“

Contact your maritime technical salesperson now

You would like to know more about the customer case? Let us start a conversation

Receive detailed information on the oil analyses, savings and calculations and a personal consultation specifically on your winch, your hydraulic oil and your requirements and goals.

Write or call me.

Andreas Mann
Andreas MannKey Account Manager - Marine Segment
Mobile: +49 (0)151 12 88 38 05
Fax: +49 (0)40 855 04 79 – 20