First of all, we must analyze the principle of the hydraulic system of the fine stone concrete pumping truck. At this time, we will find that each leg hydraulic cylinder of the concrete pump truck is protected by a two-way brake valve. Even if the oil supply pipe is removed, the cylinder cannot be removed. The hydraulic oil in the rod cavity is released, and the two-way brake valve is connected to the rodless chamber inlet of the hydraulic cylinder, and cannot be disassembled without removing the two-way brake valve, and the leg can not be recovered. Only find a way on the two-way brake valve. There is a large nut on the two-way brake valve on the leg. The analysis two-way brake valve is composed of two controllable check valves. One of the nuts is one of them. The cap has hydraulic oil oozing out. The controllable Finally, the legs are taken up by a crowbar, etc., and they are reinforced with iron wires, and the other three legs are retracted and closed in a similar manner.ck valve is ejected when it is loosened to three or four turns.
To sum up the experience of handling this fault, the jack should be lifted up by the jack, the oil pressure in the cylinder should be released, and then the two-way brake valve should be removed, so there is no danger. The piston is generally made of polyurethane material, which is more elastic and wear-resistant, and the inner wall of the conveying cylinder is also plated with wear-resistant material. There are two kinds of lubrication methods between the piston and the conveying cylinder: one is automatic lubrication, one for each pumping, the fueling system automatically adds one lubricating oil; the other is a manual refueling system, which requires manual refueling. For the automatic refueling system, it is necessary to regularly check whether the oil passage is unblocked, otherwise the piston and the conveying cylinder will be sharply worn once the oil passage is blocked; for the manual refueling system, the operator should replenish the lubricating oil regularly according to the working environment, usually 1 Times / h. Remember: When refueling, be sure to jog the piston to the lower part of the vertical refueling point so that the lubricant just enters the oil groove in the middle of the piston.
