Sync Maschine & Traktor 2 in 2 Computers ( PC & Mac )

i tried, and they always lost sync..i cant really have a pure sync...
please help in the steps below to make a good sync .

PC Have the Maschine
MAC have the Traktor 2 in S4

Thanks Brothers ;)

Are you using a MIDI cable to connect them? or how are you hooking them up?

yes, i use a midi cable