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Impactloadharmfultothehydraulicmotorofablast-holedrillZHANGYanhua我单位为二期工程投产购置一台DYQ－200型全液压式牙轮钻机。使用60天后回转液压马达噪音逐渐增大，扭矩逐渐降低，不能维持正常钻进要求（累计开机时间590h钻孔750m）.更换新马达工作58天后亦发生第一台马
Impactloadharmfultothehydraulicmotorofablast-holedrillZHANGYanhua I purchased a DYQ-200 full hydraulic cone gear drill for the second phase of the project. 60 days after the use of hydraulic motor rotation gradually increased, the torque gradually decreased, can not maintain the normal drilling requirements (590d total boot time drilling 750m.) 58 days after the replacement of the new motor also occurred the first horse