According to the abnormal faults of CINRAD/SC weather radar volume scanning time, the faults can be divided into the following two categories: first, the rotation speed of azimuth motor and pitch motor is slow; second, the pitch motor does not rise and fall in time. In view of different fault phenomena, this paper analyzes the abnormal volume scanning time from the aspects of radar servo system, signal processing and network transmission, and introduces the fault causes, troubleshooting and processing methods in detail. Due to many factors leading to abnormal volume scanning time, some fault reasons are highly hidden, which has a great impact on radar maintenance. The introduction of this paper can provide reference for front-line maintenance personnel to quickly find and deal with abnormal volume scanning radar.