Fire pump for firefighting vehicle

A fire pump system comprising:

• a gear case housing having a first side and an opposite second side;
• a first shaft having a first end and a second end, the first end located outside of the gear case housing and configured to be coupled to a power source that is substantially coaxial with the first shaft, the second end extending through the first side of the gear case housing, the first shaft rotating whenever the power source is operating;
• a second shaft extending generally parallel to the first shaft, the second shaft receives rotational energy from the first shaft;
• a clutch fixed to a first end of the second shaft;
• an impeller fixed to a second end of the second shaft, the second end extending through the second side of the gear case housing;
• and
• a pump housing which encloses the impeller, supports the second shaft, and separates the impeller from the clutch, the housing including at least one fluid inlet and at least one fluid outlet;
• wherein the clutch allows the second shaft to be selectively disengaged from the rotational energy of the first shaft, and wherein the clutch and the second shaft are removable through an opening defined by the first side of the gear case housing.