Case Study and Bid-Winning Solution Analysis of the CN6 Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle Procured by Xuzhou Municipal Government In sanitation vehicle procurement, failure rate and after-sales support are critical determinants of long-term operational cost. This article analyzes a real-world case — the purchase of Chengli special-purpose vehicles’ Dongfeng 3308 mm wheelbase sewage treatment vehicles by a municipal sanitation department in Xuzhou — based on three years of actual maintenance records and publicly available tender information. It provides an in-depth breakdown of fault type distribution, Chengli’s after-sales response time, and spare parts supply reliability, offering valuable insights for peer selection and tender evaluation. I. Case Background and Procurement Overview In 2023, a municipal sanitation department in Xuzhou procured a batch of CN6-emission-compliant sewage treatment vehicles through public tender, driven by increased local sewage treatment demand. Following multiple rounds of evaluation, Chengli Special Purpose Vehicle Co., Ltd. was selected as the supplier, providing the Dongfeng 3308 mm wheelbase model (reference chassis model: CLW5070GSSD6). A total of 10 units were delivered at an average unit price of approximately RMB 280,000 (per publicly disclosed tender data), with the total budget capped at RMB 3.213 million. Customer feedback indicated that Chengli was chosen primarily due to its comprehensive official announcements (enabling nationwide registration), factory-direct sales (eliminating intermediaries), and rapid delivery enabled by local production in Suizhou. II. Three-Year Actual Maintenance Records and Fault Distribution As of 2026, these vehicles have been in operation for approximately three years, accumulating 150,000–200,000 km per unit. Based on repair work orders recorded in Chengli’s after-sales system, the primary fault categories are summarized below: Fault Category | Occurrence Count (Unit-Times) | Percentage | Typical Symptoms ---|---|---|--- Sewage Treatment System | 12 | 40% | Suction pump seal aging, pipeline blockage, valve jamming Chassis & Powertrain System | 8 | 26.7% | Clutch wear, engine belt looseness, excessive brake pad wear Electrical System | 5 | 16.7% | Sensor failures, abnormal control panel display, loose lighting wiring Body & Accessories | 3 | 10% | Cracked frame welds, aged sealing strips, hydraulic hose leakage Others | 2 | 6.6% | Insufficient air-conditioning cooling, tire punctures Data Source: Chengli After-Sales Maintenance Records (2023–2026). Note: Fault counts are recorded per unit per repair incident; repeated occurrences across multiple units are counted separately. Analysis: The sewage treatment system accounts for the highest proportion of faults (40%), attributable to frequent exposure to highly corrosive wastewater. Chassis and powertrain issues predominantly occur after exceeding 100,000 km, reflecting normal wear-and-tear. Electrical faults are relatively infrequent and mostly involve consumable components such as sensors. Overall, vehicle reliability meets the demanding requirements of sanitation operations, with no major structural defects observed. III. Chengli After-Sales Response Time and Spare Parts Supply Assurance Over the three-year period, the Xuzhou sanitation department has rated Chengli’s after-sales service highly. Key performance metrics are as follows: Response Time: Average telephone response within 2 hours of reporting; on-site technician dispatch within 24 hours. For urgent failures (e.g., complete suction pump failure), on-site arrival is guaranteed within 4 hours. Repair Turnaround: Routine faults (e.g., pipeline blockage, valve replacement) are typically resolved within 1–2 days; repairs requiring chassis subassembly replacements (e.g., engine-related components) take 5–7 days. However, chassis components benefit from Dongfeng’s nationwide warranty network, enabling coordinated local support.