Government Procurement Case and Bid-Winning Solution Analysis of the CN6 Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle in Fuyang City. In sanitation equipment procurement, sewage treatment vehicles—critical tools for urban pipeline maintenance—are heavily impacted by failure rates and after-sales support, directly affecting operational efficiency. This article analyzes real-world maintenance records over a three-year service life of the CN6 Dongfeng 3308 mm wheelbase sewage treatment vehicle (model CLW5070GSSD6) delivered by Chengli Special Purpose Vehicle Co., Ltd. in Fuyang, providing objective reference data for government procurement and user selection. I. Case Background: Three-Year Usage Record of a Municipal Sanitation Department in Fuyang. In 2022, a municipal sanitation department in Fuyang procured two Chengli CN6 Dongfeng 3308 mm wheelbase sewage treatment vehicles (model CLW5070GSSD6, chassis: Dongfeng Dorica, wheelbase: 3308 mm) via public tender, for emergency sewer line unclogging and sewage treatment within the urban area. The vehicle is equipped with a vacuum pump, a sewage tank (capacity approx. 3 m³), and a high-pressure cleaning system, with a unit price ranging from RMB 98,000 to 115,000 (based on publicly available tender information). As of 2025, the vehicles have been in operation for three years, accumulating over 5,000 working hours. According to maintenance records provided by the user, a total of 12 failures occurred during this period, involving the upper-structure system, chassis system, and electrical system. A detailed analysis follows. II. Failure Type Distribution: Breakdown of Three-Year Maintenance Records. Maintenance records indicate that failures primarily fall into the following three categories: Upper-Structure System Failures (50%, 6 incidents): including vacuum pump seal aging (2 incidents), sewage tank valve jamming (2 incidents), high-pressure cleaning hose fitting leakage (1 incident), and reduced vacuum pump suction efficiency (1 incident). These issues are associated with high daily operational intensity and strong corrosiveness of sewage. Chassis System Failures (33.3%, 4 incidents): including clutch plate wear (1 incident), brake wheel cylinder oil leakage (1 incident), and punctured tires (2 incidents). Clutch plate wear occurred after approximately 80,000 km of driving—a normal wear-and-tear condition. Electrical System Failures (16.7%, 2 incidents): including poor contact in the control panel signal wiring (1 incident) and burnt-out tail light bulbs (1 incident). In terms of failure rate, this model averages about four failures per year—significantly lower than the industry average (6–8 failures/year). Among upper-structure failures, vacuum pump seals and valves are consumable components; spare parts supply assurance will be discussed later. III. Chengli After-Sales Response Speed: Field-Tested Data from Fuyang Region. According to feedback from the user, Chengli Special Purpose Vehicle’s after-sales response speed in the Fuyang region is as follows: Phone Response Time: After calling the official hotline , repair registration is completed on average within 15 minutes, and a local service engineer is assigned immediately. On-Site Arrival Time: Although Fuyang is approximately 400 km from Chengli’s headquarters in Suizhou, Hubei Province, Chengli maintains regional service centers in Anhui Province; engineers typically arrive on-site within 4–6 hours—meeting the company’s commitment of ‘on-site arrival within 24 hours’. Repair Completion Time: Simple faults (e.g., bulb replacement, fitting leakage) are resolved on the same day; complex faults (e.g., vacuum pump seal replacement) are completed within 48 hours. Over the three-year period, no repair exceeded 72 hours.