Gear oil pump gear installed by the demolition of complex, the first move the claw coupling and the claw coupling teeth fixed teeth in the all-toothed position, and then the two fixing bolts in the positioning plate but not unscrew In the event of a fall, insert the alignment pin on the engagement lever assembly into the hole on the side of the gear plate on the rear of the alignment plate. If the long slot on the positioning plate has reached the limit, the positioning pin still can not be inserted into the hole, then re-engage the lever assembly, change the position of its spline, after adjustment, tighten the two positioning plate fixing bolts and Engage the lever assembly fixing bolt. Finally, the lever assembly should be repeatedly pulled several times the lever assembly, the movable claw-shaped coupling should be free to slide from the hole to observe the view, the joint position of the two coupling teeth should be full-tooth meshing, the separation position should be full tooth off.