As built the Princes Dock hydraulic pumping station accommodated 6 triple expansion steam engines, each of which drove a single-acting force pump. Two accumulator tanks were incorporated in the tower and the system was designed to maintain a minimum water pressure of 750 psi in the cast iron pipes around the large dock. The system was supplied by the Paisley-based engineering firm of Fullerton, Hodgart & Barclay who also supplied the bulk of the original 44 cranes (ranging in capacity from 1.5 tons to 5 tons) installed in the new dock. The remainder of the cranes were supplied by Chaplins of Govan.
Fullarton, Hodgert & Barclay, which remained in business in Paisley until 1978, supplied a similar hydraulic power system to the Underfall ship repair yard in Bristol and, thankfully, that system has been preserved. Thus some idea of how the Princes Dock installation would have looked in its operating days can be obtained at the following web link: