由油箱、动力机构、换向阀、卸压阀、泵油机构组成，泵油机构由油泵体、高、低压油出油孔、偏心轴、偏心轴承、从动齿轮和一对高压油泵以及一低压油泵构成，油泵体悬固于油箱盖上，高、低压油出油孔开设在油泵体上，与卸压阀油路连接，偏心轴呈纵向设置，上端枢置于油泵体中央，下端固设偏心轴承，从动齿轮固置在偏心轴顶部，与动力机构联结，高、低压油泵悬固在油泵体上，各具一与偏心轴承相触的作动件，高、低压油泵的泵腔分别与高、低压油出油孔相通。优点：将泵油机构与动力机构的连接为垂直连接，可充分利用空间而小化占地面积，有利于作业及运输；将高、低压油泵的泵油形式变为偏心轴承的作动形式，具有结构简单、零部件少而利于装配。
It is composed of oil tank, power mechanism, reversing valve, pressure relief valve and pump oil mechanism. The pump oil mechanism consists of oil pump body, high and low pressure oil outlet hole, eccentric shaft, eccentric bearing, driven gear, a pair of high pressure oil pump and a low pressure oil pump. The oil pump body is suspended on the oil tank cover, and the high and low pressure oil outlet hole is opened on the oil pump body. Connecting with the oil circuit of the relief valve, the eccentric shaft is longitudinally arranged, the upper pivot is placed in the center of the oil pump body, the lower end is fixed with eccentric bearing, the driven gear is fixed on the top of the eccentric shaft, and is connected with the power mechanism. The high and low pressure oil pumps are suspended on the oil pump body, and each has a mover touching the eccentric bearing, and the pump chambers of the high and low pressure oil pumps are separately arranged. It is communicated with high and low pressure oil outlet holes. Advantages: Connecting the pump oil mechanism with the power mechanism vertically can make full use of the space and reduce the occupied area, which is conducive to operation and transportation; transforming the pump oil form of high and low pressure oil pump into the action form of eccentric bearing, which has simple structure, fewer parts and components and is conducive to assembly.