... and laying down, also for hoisting the max. weight of drill string while the main drive fails; there ... gear box and cardan shaft.drilling rig,land drilling rigs,drilling rig equipment..Parameter Model, drilling rig ZJ30L ZJ40LZJ50LZJ70LNominal drilling depth, 127mm(5)DP, m30004000500007000Max ... power× number810KW×2810KW×3810KW×3810KW×4 drilling rig,land drilling rigs,drilling rig equipment