Quick couplers are easily overlooked as simple, passive components, but they are an important part of a hydraulic system.
A neglected quick coupler can easily become a point of failure.
Using contaminated (dirty) hydraulic fluid is the quickest way to shorten the life of a hydraulic system.
One of the easiest ways to introduce contaminants is through the quick couplers.
This is why the cap should be replaced on a quick coupler whenever it is not in use.
More importantly, the quick coupler needs to be sprayed with lubricant, or wiped down with a clean cloth before it is connected.
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