1. First, the main hydraulic control valve before and after the end of the valve closed.
2. The main hydraulic control valve cover screw loose fittings, pressure release valve.
3. Remove all the screws, including the necessary control of brass nut.
4. Take the valve cover and spring of the hydraulic control valve.
5. The shaft core, diaphragm, piston and so on, do not damage the diaphragm.
6. All these things out, check the diaphragm and] - ring is damaged; do not be divided without damage to the internal parts on their own struggle
7. Detailed view of the main valve internal hydraulic control valve seat, shaft core, if there is damage, if other debris within the main valve to clean out. Found hydraulic control valve diaphragm or O-shaped ring is damaged, please the nut loose core shaft, gradually break down the patch or ring, after removing the back and put on the new diaphragm or O-shaped ring.
8. Remove all the screws, including the necessary control of brass nut.
