A GJW111 type excavator in the working process of the whole machine work slow, weak fault phenomenon. The cause of the problem is: the hydraulic pump wear, servo regulator binding, provides system of hydraulic oil flow is insufficient, the main safety valve failure, insufficient engine power output and the guide system pressure, etc. In the process of fault inspection, whether light or homework, engine speed is normal, no smoke phenomenon; The pressure and flow rate of the primary system in the calibration range. Failure analysis and focus on the main relief valve and hydraulic pump. Based on the principle of easy after the first difficult, first the main safety valve, no obvious improvement; Second decomposition, cleaning the main safety Industrial Valves, found the main relief valve parts without obvious wear, spring break, still reassemble adjusted failures; Finally replaced a new master safety valve, but also do not have any improvement, system pressure is still in 18 Between 24 mpa ( Set pressure of 30 mpa) ; Inspect the hydraulic oil and filter are normal, and that of hydraulic pump failure is less likely. Repair personnel in the process of inspection of commissioning, has no intention to stop the brake handle in braking position, the malfunction phenomenon disappear completely. Base on the principle analysis, the problem of stop brake valve is mainly stop brake valve adjustment does not reach the designated position. Brake lifting, stopping brake valve stem is not in place to make the guide part of oil flow into the brake cylinder downtime, part of the stopping brake valve flow back to the fuel tank, and the guide system pressure is insufficient. It makes distributing valve stem is not in place, in the process of operation of the main system plays a role of throttling or leakage flow, hence unable to work, dynamic slow fault phenomenon. Remove the stop brake valve, found that the push rod adjustment bolt looseness, push rod length is shorten, adjusted fault phenomenon disappear completely. In this paper, the keyword search: valve supply information
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