Slewing Houses Driven by Gear Racks in Hydraulic Cylinders

Hello @ all,

last few weeks I'm intensive searching for producers of ready finished slewing houses, driven by gear racks in hydraulic cylinders.

This slewing house is to be used for forestry cranes. Mainly used for lifting / pulling / moving boles / log.

Who knows producers / manufacturers?

It is very difficult to find because the main problem could be that I maybe don't know the english word which is used for this gear rack driven slewing houses.

Please help me. I thank you very much in advance for your hints!

Best regards,

Armin