According to the fault display, hydraulic cam and groove coupling fault can be divided into two kinds

　　According to the fault display, hydraulic cam and groove coupling fault can be divided into two kinds.

　　Functional failure. If some part of the cam and groove coupling has failure, loss of function and not to work called functional failure. This failure of cam and groove coupling is that the operator or the repair personnel can judge out. Because of this failure is real, it is also known as the actual fault.

　　Potential failure. Associated with the progressive fault, fault in the development, operation index decreased, but not loss of function, and at the same time close to the fault germination stage, when the fault diagnosis, which is considered as a potential fault phenomenon, commonly known as work. For example, cam and groove coupling vibration is gradually growing, sealing system oil leakage signs, it belongs to the potential failure.

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