The ornamental design for a hydraulic greasecoupler, as shown and described.
1.-2. Hydraulic grease couplers
1.1 : Perspective
1.2 : Left
1.3 : Top
1.4 : Bottom
1.5 : Front
1.6 : Back
2.1 : Perspective
2.2 : Left
2.3 : Top
2.4 : Bottom
2.5 : Front
2.6 : Back
Design 1 shows a hydraulic grease coupler (with a rotary connection) to couple an outlet of a grease gun and a grease nipple; design 2 shows a hydraulic grease coupler (with a rotary connection) to couple an outlet of a grease gun and a grease nipple.
The portions of the hydraulic grease couplers shown in broken lines form no part of the claimed design.