Hydraulic mount assembly and a powertrain that utilizes the hydraulic mount assembly

A powertrain comprising:

• a dynamic mass;
• a structure that supports the dynamic mass;
• a hydraulic mount assembly attached to the structure and supports the dynamic mass, and wherein the assembly includes:
• a mount body defining a cavity;
• a first plate fixed relative to the mount body inside the cavity to separate the cavity into a first chamber and a second chamber;
• wherein the first plate defines a plurality of first passages that fluidly connects the first and second chambers;
• a decoupler disposed between the first chamber and the second chamber, and the decoupler overlaps the first plate;
• an actuator coupled to the first plate;
• wherein the decoupler is movable between a locked position and an unlocked position in response to actuation of the actuator;
• and
• wherein the decoupler abuts the first plate when in the locked position to prevent fluid communication through the first passages, and the decoupler is movable relative to the first plate when in the unlocked position to allow fluid communication through the first passages.