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This have nothing to do with the external hydraulic connectors.
That works only for the internal hydraulic for the rear lift arms.
The flip-lever is called reaction speed lever and that means the oil flow setting for your lift arms.
3320, 3340, 4320, 4340, 5320, 5340, 5340 Horal. 6320, 6320 Turbo, 6340, 6340 Horal, 6340 Turbo. Zetor Tractors Models PDF Format CD. THIS MANUAL IS CD FORMAT ON CD-ROM.