The stage and characteristics of the mechanical failure of the thin cylinder hydraulic system have different characteristics according to different stages of use.

(1) The characteristics of faults in the early stage of the use of thin cylinder hydraulic system mechanical machinery. During the initial period of use (corresponding to the turn-around period), the failure of the construction machinery is from high to low (fall curve). The use of early failure rate is related to the use of manufacturing or maintenance quality and the use of walking time. If the quality of construction machinery manufacturing or repair High and can be used and maintained properly. Then, the initial failure rate is low. Otherwise, the early failure rate will be high. The early faults are mostly the loosening or loosening of the connection bolts; loosening or loosening of the pipe joints: residual metal chips or foundry sands tend to clog oil passages or trapped in relative motion friction (such as actuator cylinders in hydraulic systems). Causes oil leakage, changes in the adjusted clearance or pressure, so that the machine can not perform the specified ability, some joints leak due to bolts are not tight, leaking oil, leaks and so on.

(2) The characteristics of the faults in the normal use phase of the thin cylinder hydraulic system mechanical machinery. After the completion period of construction machinery, it enters the normal use phase. The construction machinery is operated in this stage. As long as it is maintained and used correctly according to regulations, failure will not occur. Even if a failure occurs, it is also a random failure (this kind of failure is hidden, it is not easy to find during maintenance or inspection), so the failure rate is Very low, the curve slightly rises slightly. If the construction machinery fails during normal use, it is mostly accidental or due to improper use or maintenance.

(3) Thin-cylinder hydraulic systems Mechanical machinery uses fault features that are close to the overhaul phase. When the construction machinery is used near the overhaul period, the loss of each component increases, and the technical condition deteriorates. Failure characteristics at this stage are characterized by high failure rates and generality. Most of these failures are caused by wear and tear and parts aging. The phenomenon of blockage, leakage, and bad appearance in the oil circuit occurs more often.

(4) Failure characteristics of mechanical machinery in thin cylinder hydraulic systems in different seasons. The failure rate of construction machinery is related to the season. When using machinery at low temperatures in winter, the failure rate is higher than in summer. For example, fuel supply systems are often poorly atomized due to low temperatures in winter. The fuel is easy to be solidified and the oil circuit is blocked and difficult to start, or when the engine is running, the flameout and other faults occur. The lubricant has poor fluidity and accelerates the wear of the components. The battery leakage may cause the engine not to start, the brake to be unreliable, and the fluid transmission to be abnormal.