Cleaning Procedures for Hydraulic Hose Assemblies

Hydraulic Hose Assemblies

Anyone who works in the hydraulic industry knows how important it is to reduce contamination. Dust particles, debris, dirt, and even water that enters equipment may wreak havoc and result in hydraulic system failure. Therefore, it is critical to keep all these contaminants out of the system by thoroughly cleaning the hoses before installation. After the hoses have been cut and the fittings crimped, rubber debris, as well as metal particles resulting from the assembly process, are likely to enter the hydraulic system if you don’t. Some of these possible contamination sources include:

      • Mandrel lubricant that is used in hose manufacture may not be properly cleaned out of the hose at the point of manufacture. Mandrel lubrication is used to ensure that the hose does not adhere to the mandrel during the vulcanization and curing process.
      • When cutting hydraulic hose to the specific lengths required by the customer, rubber dust is injected into the hose
      • The crimping process can cause minute metal shards to fall off and become lodged in the hose.
      • Simply leaving a complete hose open to the air allows for the potential of air-borne contamination. Airborne contamination can occur in the shop where the hose is cut or during transport.

All of the above can potentially take place before the hose is even mounted in place for its new application. Failing to install a clean hose can lead to the hydraulic fluid becoming contaminated and breaking down, leading to potentially costly and dangerous situations.

To prevent these contamination concerns, there are three common methods used for removing contaminants from hydraulic hose assemblies:

High-Pressure Air:

This is the most convenient cleaning procedure for short hoses. In long hoses, air pressure is less likely to remove the dust particles as they may get caught within the hose assemblies. Cleaning with high-pressure air works well with almost all types of hose assemblies, no matter the brand. You can choose this simple yet effective way to keep your hose assemblies clean and contaminant-free.

Fluid Flushing:

In this method, a clean fluid compatible with the hose assembly’s inner tube is flushed through it to generate a turbulent flow. This high-pressure fluid quickly removes contaminants from the hose’s inner tube wall. Before fluid flushing, you also need to make sure that the inside of the hose is dry.


The use of foam projectiles is one of the most effective methods to clean hose assemblies. The projectiles are shot through the hose assemblies via any inert clean gas or dry compressed air. To ensure that the projectiles completely travel through the hose and aren’t left behind in it, special hand-held/bench-top launchers are used. Also, the projectiles should be 20%-30% larger than the Inside diameter of the hoses, to allow them to compress against the hose assembly wall to grab the dust and dirt particles. For the best results, use the foam projectiles from both ends of the hose assemblies, and then cap the ends to make sure they remain contaminant-free.

If you need assistance with selecting the right high-pressure hydraulic hose fittings or other parts for your hydraulic system, contact us today! We have the experience and knowledge in-house to provide you with the best consulting, logistics, installation and hydraulic hose repairs. If you have any question, call us @1-877-302-6283

Seaway Fluid Power (SFP), was established in 1976. Based in St. Catherines, Ontario, SFPG provides its customers with quality fluid power products and services. SFPG carries an extensive parts inventory of fluid power products such as hydraulics, pneumatics, hose and fittings, stainless steel fittings, instrumentation and compressed air.

"When there’s no time for downtime."

Sea Way Fluid Power Group