After you create a hose assembly, you need to clean the hose. If you are a large company that has a lot of hydraulic machinery and a lot of highly trained hydraulic individuals, you know how important it is to have clean hydraulic oil. One of the sources of hydraulic contamination is from ingression. Ingression happens anywhere where it’s added to the system through just plain dirt dropping in your reservoir, from steel filings or from anywhere outside the system. You don’t want to be additive to that if you’re doing hydraulic hose assembly.
You need to clean the hose, so that the particles from cutting and skiving and crimping—the entire assembly process—doesn’t add to the contamination of the system, especially if you’re trying to adhere to a particular ISO code of cleanliness. You need to use only approved cleaning apparatus, and there are a couple of companies out there that do it. After you clean the hose, you must immediately cap the hose to protect from environmental contamination. They may go in a shipping area, or they maybe go to an area on a machine integrator where they build the machine where there’s grinding and welding, you want these hoses laying around with the ends open or everything just falls right into it, so then you’ll cap it.
Some cleaning apparatuses use foam pellets that are fired through the hose, picking up all the contamination. The idea is to fire this in both directions. Typically, you fire it after the hose assembly is manufactured. Shoot it out the other end, and then cap it. This protects it from any ingress contamination, and then you have yourself a complete hose.