Abstract: The invention relates to a pneumatically controlled pressure transducer for operating hydraulic work tools having a dual operating cylinder, on one side of which a pneumatically operable piston, on the other side a hydraulically operable piston is provided and, to the hydraulic side of which a hydraulically operable working tool can be joined.The essence of the invention resides in that a control valve is provided which is coupled with the primary space located in front of the piston of the pneumatically operable cylinder of the operating cylinder and, which is connected into an operating relationship with a starting valve, and wherein the control valve is connected over a throttle-check valve to a further valve on one side, while on the other side, over a quick exhaust valve, is connected with a hydraulic container, respectively, over a valve with the secondary space of the pneumatically operable cylinder.