Hydraulic coupling device

A hydraulic coupling arrangement comprising a multi-line hose, a coupling device surrounding an end portion of said multi-line hose and having a plurality of plug pins, a holder for holding the plug pins, said coupling device including an internconnected casing and sleeve means, and means connecting said holder to said casing means, and a connector having a plurality of sockets, each plug pin hydraulically connecting a respective line of the hose, and the plug pins each mating with a respective socket of the connector, wherein one of the plug pins is longer, and has a larger diameter than the other plug pins and constitutes an alignment pin for accurately aligning all of the plug pins with the corresponding sockets of the connector, and wherein said one plug pin is connected to a return line of the hose, and said other plug pins are each connected to a respective pressure line of the hose, said plug pins being positioned on a common pitch circle of the holder, said one plug pin being rigidly attached to the holder, and each of the other plug pins being attached to the holder in a manner such as to permit limited movement in any direction, and said casing and connector having cooperating connecting means therebetween.