The advantage of using couplers rather than threaded connections is that you can quickly make and break hydraulic connections. The disadvantage of using couplers
is that they are frequently the point at which dirt enters a hydraulic system.
OBSERVE THE FOLLOWING WHEN USING COUPLERS:
• Make sure couplers are clean before making any connections. Use dust caps to keep couplers clean. If a dust cap was not used, clean the coupler by carefully blowing the dirt out with compressed air.
• Tighten couplers hand tight only; do not use wrenches. The threads must be fully engaged to allow for proper oil flow. A partially connected, checked-off, coupler is shown below along with a properly connected coupler.