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Because it is the only way to hold the connection between swivel or fitting to stand the pressure of hydraulic oil being delivered inside the hose. Avoid leakage
A hydraulic hose can only be used if there is a fitting on the end. It is the method of getting this fitting on to the hose which is referred to as crimping or swaging. It is a straightforward compression method, using different sized die and a compression collar.
To make secure a leak proof connection between a metallic connector and rubber hose. that is required in the hydraulic circuit to prevent leakage other wise pressure will drop due to leakage and power will not be transmitted properly.
because there is high fluid pressure in the hoses if not crimping joints will free..
Assembling all types of connectors on the fixed hoses
