Patent ID: 7788778

Claim:
A device for positioning a piston on a shaft, wherein the shaft includes a groove that houses a lip seal, and wherein an installation force is required to position the piston overtop the lip seal when the lip seal is properly positioned, the device comprising: a cylinder moveable between a plurality of positions to exert a first force; a weight member in contact with the piston and having an annular portion circumscribing the cylinder, wherein a plurality of pins are attached to the annular portion, and wherein the plurality of pins transfer a total force to the piston; and a spring disposed between the cylinder and the weight member, wherein the spring includes a first end in contact with the cylinder and a second end in contact with the weight member, wherein the spring is operable to transmit the first force from the cylinder to the weight member, wherein if the total force does not exceed the installation force then the spring does not compress greater than a first distance indicative of a properly positioned lip seal, and wherein if the total force does exceed the predetermined installation force then the spring does compress greater than the first distance, indicative of an improperly positioned lip seal.