How to clean hydraulic hose assembly before putting it into use

How to clean hydraulic hose assembly before putting it into use

Prior to use, hydraulic hoses have a certain amount of dust, dirt, and debris adhered to the inner wall of the pipe. There are also contaminants produced when hydraulic fittings are assembled, and hydraulic hoses produce debris when they are cut, as tiny rubber and dirt particles could enter the hydraulic system and cause damage.

Moisture adhering to the inner wall during production, transit, and storage is another key source of pollutants.

If these pollutants are not eliminated, they can impair the life of the hydraulic system and perhaps cause irreparable damage.

Clean hydraulic hose
Clean hydraulic hose

Therefore, prior to use, the hydraulic assembly must be cleaned. The procedure entails removing all debris adhered to the inner wall of the hydraulic hose and making it dry and clean on the inside, primarily through the use of three distinct methods: fluid flushing, compressed gas flushing, and foam debris flushing.

compressed air

The pressurized air or inert gas must be dry, clean, and contaminant-free; this method is appropriate for short hoses. With longer hoses, it is possible that any contaminant particles driven through will become trapped within the assembly.

The most effective method is to blow each end of the hydraulic unit. This procedure is simple, effective, economical, and suitable for the majority of applications; the blowing process should persist for tens of seconds or minutes until no contaminants remain.

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Hydraulic fittings

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fluid flushing

The fluid being used must meet several conditions:

first, the fluid being used must be compatible with the inner wall of the rubber hose, not corroding the inner wall of the hose;

second, it should not contain any impurities, so it must be filtered before use.

Third, because water is a pollutant, there must be no moisture in the fluid; moisture in the hydraulic system will cause damage to the hydraulic system and shorten its life;

finally, for the sake of safety, it is best to blow dry the hydraulic hose with dry compressed air after fluid flushing clean.


Foam projectiles are the most effective way. Foam projectiles are created by blasting foam fragments via a hose assembly using dry compressed air or another inert clean gas.

Because the projectiles compress against the hose assembly’s wall to “catch” any dirt and debris, they must be 20 to 30 percent larger than the ID of the hose tube.

Hand-held or bench-top style launchers are required to shoot dry compressed air and fire foam projectiles from one side of the hose to the other.

To get the best results, shoot foam projectiles through the tube from both ends to make sure everything is gone.


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