... device which can be used for mast lifting and laying down, also for hoisting the max. weight of ... 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 ... compoundDiesel power× number810KW×2810KW×3810KW×3810KW×4 drilling rig,land drilling rigs,drilling rig equipment