Anyone who works in the hydraulic industry knows the importance of reducing contamination. Particles, dirt, debris and even water that enter a system can quickly wreak havoc, causing system failure and even possibly destroying a component or machine. This is why it is essential to keep these contaminants out.
To ensure hydraulic fluid remains contaminant free, it is imperative to clean all new hoses before installation. If contaminants are left in a hose after it has been shipped to a user or has been cut and crimped, those rubber and dirt particles will easily end up in the reservoir and flow throughout the entire system.
Three common methods are used to remove contaminants from the inner tube of a hydraulic hose: high-pressure air, fluid flushing and projectiles.
Air — High-pressure air can be blown through a hydraulic hose or assembly, as long as it is clean and dry. This works best with shorter, smaller hoses, as the longer the hose, the more likely particles may get caught within the assembly.
Fluid flushing — As long as the fluid is clean and compatible with the hose assembly’s inner tube, you can flush an assembly with high-pressure fluids to create turbulent flow. This will remove contaminants from the inner tube wall. However, to ensure the fluid is clean itself, you must use filtration to ensure that the fluid itself is contaminant free. Before you can install the hose, you must ensure that the inside of the hose is then dry.