37 servicing of pumps, hydraulic installations, hydraulic devices, namely conveyors, cylinders, circuits, drives, machines, motors and engines; installation of pumps, hydraulic installations, hydraulic devices, namely conveyors, cylinders, circuits, drives, machines, motors and engines; maintenance of pumps, hydraulic installations, hydraulic devices, namely conveyors, cylinders, circuits, drives, machines, motors and engines; assembly of pumps, hydraulic installations, hydraulic devices, namely conveyors, cylinders, circuits, drives, machines, motors and engines; retrofitting of pumps, hydraulic installations, hydraulic devices, namely conveyors, cylinders, circuits, drives, machines, motors and engines; repair of pumps, hydraulic installations, hydraulic devices, namely conveyors, cylinders, circuits, drives, machines, motors and engines; over-haul of pumps, hydraulic installations, hydraulic devices, namely conveyors, cylinders, circuits, drives, machines, motors and engines; cleaning of pumps, hydraulic installations, hydraulic devices, namely conveyors, cylinders, circuits, drives, machines, motors and engines; replacement of pumps, hydraulic installations, hydraulic devices, namely conveyors, cylinders, circuits, drives, machines, motors and engines; adjustment of pumps, hydraulic installations, hydraulic devices, namely conveyors, cylinders, circuits, drives, machines, motors and engines; attaching pumps, hydraulic installations, hydraulic devices, namely conveyors, cylinders, circuits, drives, machines, motors and engines to existing machinery; painting and varnishing services, namely coating and surface finishing of machines; heavy equipment cleaning services; all the above-mentioned services especially in the field of hydraulics