Hydraulic mount with gas spring supported decoupler

A hydraulic mount for an operating component of a vehicle comprising:

• first and second mounting members;
• a body connected to one of the mounting members and a base connected to the other of the mounting members;
• an orifice plate assembly;
• a pumping chamber formed between said body and said orifice plate assembly and a reservoir formed between said orifice plate assembly and a member interposed said orifice plate assembly and said base;
• a decoupler supported by said orifice plate assembly and in fluid communication with said pumping chamber, wherein said orifice plate assembly includes a first orifice plate including a plurality of openings therein for providing fluid communication between said pumping chamber and said decoupler and a second orifice plate, a recess between said orifice plates for receiving said decoupler, said decoupler being secured in said recess in fluid tight sealing engagement with a wall delimiting said recess;
• a gas cushion formed between said decoupler and said orifice plate assembly and operable to damp relatively low amplitude vibrations in a predetermined frequency range;
• and
• a plug removably mounted on said second orifice plate for communicating gas to a space formed between said decoupler and said second orifice plate, wherein said plug includes a part operable to secure a hub of said member interposed said orifice plate assembly and said base between said plug and said second orifice plate.