In-depth interpretation of the government procurement case and bidding proposal for the Xuchang Dongfeng Yizhan-style sewage treatment vehicle: In municipal sanitation applications, sewage treatment vehicles serve as critical equipment for addressing urban sewer network blockages, emergency pumping and drainage, septic tank cleaning, and similar scenarios—procurements that typically entail stringent technical specifications and after-sales service requirements. In 2024, a municipal sanitation department in Xuchang procured a batch of Dongfeng Yizhan-style sewage treatment vehicles via public tender, with Chengli Special Purpose Vehicle Co., Ltd. emerging as the winning bidder and completing delivery. This article provides an in-depth analysis of this case across four dimensions: contract after-sales clause design, common after-sales disputes, Chengli’s lifetime after-sales service system, and frequently asked questions—offering valuable reference for peer procurement entities. I. How Are After-Sales Clauses Designed in Contracts? In government procurement contracts, after-sales clauses constitute the core mechanism ensuring stable operation throughout the equipment’s lifecycle. Taking the Xuchang case as an example, the tender documents explicitly stipulated the following: • Chassis Warranty: The Dongfeng chassis must provide nationwide joint warranty service, with a minimum warranty period of 12 months or 30,000 km (whichever occurs first), covering core components including the engine, transmission, and axle assemblies. • Superstructure Warranty: The specialized sewage treatment vehicle superstructure (e.g., vacuum pump, separation system, piping) must offer lifetime service; non-user-induced failures are repaired free-of-charge during the warranty period, while only material cost is charged post-warranty. • Emergency Response: Upon fault reporting, the supplier must respond by phone within 2 hours and dispatch technical personnel to the site for resolution within 48 hours. • Spare Parts Supply: Commonly used spare parts must be shipped directly within 24 hours to minimize equipment downtime. In its bid proposal, Chengli provided explicit commitments addressing each of the above requirements: leveraging Dongfeng’s nationwide service network for chassis joint warranty, and relying on Chengli’s proprietary after-sales team and spare parts warehouse for the superstructure—guaranteeing “lifetime service and direct 24-hour spare parts shipment.” This comprehensive solution contributed significantly to Chengli’s high evaluation score during bid assessment. According to publicly available tender information, the Xuchang project’s budget ceiling was approximately RMB 1.368 million, with the final winning unit price around RMB 185,000 per unit. A total of six Dongfeng Yizhan-style sewage treatment vehicles were delivered (reference model: CLW5070GSSD6 chassis-based conversion). II. Common After-Sales Disputes and Mitigation Strategies In special-purpose vehicle procurement, after-sales disputes commonly arise in the following areas: • Ambiguous Responsibility Allocation Between Chassis and Superstructure: Some manufacturers deflect responsibility for chassis faults to Dongfeng service stations and attribute superstructure faults to subcontracted suppliers—leaving end users navigating between multiple parties. Chengli adopts a clear “original-equipment manufacturer (OEM) chassis joint warranty + lifetime superstructure service” model, defining responsibility boundaries unambiguously to prevent finger-pointing. • Untimely Spare Parts Delivery: Non-standard or discontinued parts may require extended lead times. Leveraging its position as China’s largest special-purpose vehicle manufacturing base (Suizhou, Hubei Province), Chengli maintains its own spare parts warehouse and guarantees direct shipment of commonly used parts within 24 hours. • High Post-Warranty Repair Costs: Some suppliers impose steep on-site service fees and labor c