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全平衡式宽带长冲程抽油机采用一种机械辅助换向装置。装置没有附加别的控制机构，只是把通常的整体配重分为主配重和副配重，另外增加了上、下缓冲限位器。机械辅助换向装置通过能量转换和形成力差，实现抽油杆运动的自动换向，使电动机正、反转都能在接近额定转速及空载条件下启动，保证工作可靠。ＣＹＪＤ１４—８—３７ＨＺＱ全平衡式宽带长冲程抽油机样机的厂内试验表明，反向启动电流在单边载荷为４４．７６ｋＮ时仅为额定电流的１．５倍，在连续运转条件下电动机温升不超过６０℃，能满足长冲程抽油要求。
Fully balanced broadband long-stroke pumping unit uses a mechanical auxiliary reversing device. The device is not attached to any other control mechanism, but the usual overall weight is divided into the main counterweight and vice counterweight, in addition to the upper and lower buffer limiter. The mechanical auxiliary reversing device realizes the automatic reversing of the sucker rod movement through the energy conversion and the forming force difference so that the positive and the reverse rotation of the motor can be started near the rated speed and the no-load condition to ensure the reliable operation. CYJD14-8-37HZQ fully balanced wide-band long-stroke pumping unit prototype machine tests showed that reverse start-up current in the unilateral load of only 44.76kN rated current of only 1.5 times the continuous operation of the motor Temperature rise does not exceed 60 ℃, to meet the long stroke pumping requirements.