A hydraulic thruster for vessel. The hydraulic thruster is intended for incorporation into a modular vessel thruster system, and is easily installed onto, and removed from, a vessel having such system. A housing is tiltably attached to a bracket, which in turn is removably mounted to a vessel. A cylinder is rigidly attached to the housing, and a tube is extensibly and rotatably disposed within the cylinder. A thrust means is disposed at a lower end of the tube. The instant thruster incorporates positive redundant down-tilt stop means, increased extension/retraction range, reduced shipping size, and means for securely and removably attaching the thruster to a vehicle deck.