NOVELTY - Hydraulic pump drive unit includes a generator to supply electric power to an electrical motor. The generator comprises an electric power generation module including an electrolyte film (46) disposed between an anode-side electrode plate (47) and a cathode-side electrode plate (48). The anode-side electrode plate comprises platinum supported by sintered compact of zeolite, coral sand and fine particle powder of carbon black. The cathode-side electrode plate comprises ruthenium supported by sintered compact of fine particle powder of zeolite and carbon black.    USE - Drive unit is used for driving hydraulic pump of hydraulic drive mechanism of a machine for construction operation, e.g. hydraulic-drive-type back hoe. The drive unit may be used for electric vehicle.    ADVANTAGE - The low-noise drive unit is small, has high electric power generation efficiency compared with the conventional fuel cell, and drives an electrical motor using a generator which can obtain high output.    DETAILED DESCRIPTION - Hydraulic pump drive unit comprises an electrical motor. A generator supplies electric power to the electrical motor and comprises an electric power generation module including an electrolyte film disposed between an anode-side electrode plate to which the liquid fuel for hydrogen generation is supplied and a cathode-side electrode plate to which oxygen is supplied. The anode-side electrode plate comprises platinum supported by sintered compact of zeolite, coral sand and fine particle powder of carbon black. The cathode-side electrode plate comprises ruthenium supported by sintered compact of fine particle powder of zeolite and carbon black. INDEPENDENT CLAIMS are included for:    (a) a machine for hydraulic operation; and    (b) a generator.    DESCRIPTION OF DRAWING(S) - The figure shows an exploded perspective view of an electric power generation module.    Tightening boards (41)    Electrode assembly (42)    Gaskets (43,47a,48a)    Partition plates (44)    Current-collection boards (45)    Electrolyte film (46)    Anode-side electrode plate (47)    Cathode-side electrode plate (48)