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Vehicle description:
The 753.7 diesel locomotive is designed for freight service on 1,435 mm gauge track at speeds of up to 100 km/h. The bogie assembly, underframe, driver’s cab and hoods are retained from the original 740 class locomotive. The upgrade consists chiefly in the replacement of the expensive-to-run and unreliable ČKD K 12 V 230 DR engine with the Caterpillar 3512 B DITA. The auxiliary drives and cooling block have also been redesigned. The locomotive is compliant with the UIC 505 loading gauge and fitted with an electrodynamic brake.
The bogies and underframe are taken from the original locomotive. Necessary changes have been made in order to mount the new engine. The mounting of the body assembly on the bogies has also been redesigned, with the installation of rubber-metal columns. To increase the level of protection and also the resistance of the underframe, the buffer beams have been modified to include the option of installing crumple zones. The traction hook is sprung by rubber-metal lamellae. The drive unit consists of a Caterpillar 3512 B DITA diesel engine connected directly to a Siemens Drásov 1FC2 569-6 traction alternator via a spacer.
New driver’s desks have been installed in the original cab, with integrated drive and brake control with Lekov controllers. The locomotive is fitted with a DAKO DK-GP electronically controlled automatic and direct-acting air brake and a hand brake. The compressed air source is a Mattei C 90 hydrostatically driven rotary vane compressor. The electric power transmission is AC/DC with a regulator supplied by NES Nová Dubnica. The electrodynamic brake allows inclination/gradient and stopping mode braking with a maximum output of 1,710 kW, and parking brake mode. The EDB block is mounted in the engine compartment in the forward driver’s cab.
The locomotive is fitted with a master-slave unit allowing any locomotive engine to be started and stopped, a driver’s vigilance device, Tribos-system lubrication of wheel flanges with plastic lubricant, a Metra electronic speedometer, cab air-conditioning, a VS 47 radio and a driver’s safety device.
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