Abstract: A quick connect-disconnect coupling for joining two drive shafts on a common axis for simultaneous movement where one drive shaft extends from a prime mover and the other from a piece of equipment. The coupling includes a first mating member mounted on one of the drive shafts that has socket means and drive pin means, and a second mating member on the other of said drive shafts that has a ball member matable with said socket and pin engaging means to receive said pins which when said pins are rotated will impart rotation to the first mating member for simultaneous rotation.

Abstract: An improvement in a hydraulic motor for use with an airless paint sprayer system which includes releasable stop means that lock a spool means within said motor to a surrounding sleeve which stop means signal the end of upper and lower strokes of a reciprocating piston associated with said sleeve. In addition, hydraulic fluid anti shock means are provided to prevent the rupture of outlet filter means.