Government Procurement Case Study and Bid-Winning Solution Analysis of the Guo-VI Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle in Yancheng In government procurement, after-sales support—especially for frontline sewage treatment vehicles—is often the top concern for buyers. In a public tender conducted in 2025 by a district Urban Management Bureau in Yancheng, a batch of Guo-VI emission-standard sewage treatment vehicles was planned for routine maintenance of urban sewage pipelines and pumping stations. After comprehensive evaluation, two specialized sewage treatment vehicles built on the Dongfeng 3308 mm wheelbase chassis were ultimately delivered. This article analyzes the case from four perspectives: after-sales clause design in contracts, common dispute types, Chengli Special Purpose Vehicle’s lifetime after-sales policy, and FAQs—to help procurement entities better understand how clearly defined after-sales terms can reduce operational risks. I. How to Draft After-Sales Clauses in Contracts? Key Insights from the Yancheng Case In the Yancheng tender documents, after-sales service clauses were placed prominently within the technical proposal section. According to feedback from the procuring entity, the final contract’s after-sales clauses centered on three core points: 1. Separate Warranty for Chassis and Superstructure: The Dongfeng chassis is covered under the original manufacturer’s nationwide warranty, valid for 2 years or 50,000 km (whichever comes first); the superstructure—including sewage pumps, separation systems, etc.—is covered by Chengli Special Purpose Vehicle with lifetime service. 2. Response Time and Spare Parts Availability: Suppliers must provide a resolution plan within 2 hours of receiving a repair request and deliver replacement parts or dispatch technicians onsite within 24 hours. The contract explicitly stipulates “standard spare parts shipped directly within 24 hours” to prevent vehicle downtime caused by part shortages. 3. Training and Acceptance: On-site operator training lasting no fewer than three days must be provided upon delivery, including troubleshooting guides for common faults. Third-party inspection reports are required during acceptance to verify that separation efficiency meets design specifications. These provisions effectively prevent post-delivery disputes arising from ambiguous responsibility between chassis and superstructure. During tender preparation, the procuring entity also referenced comparable cases provided by Chengli Special Purpose Vehicle—including 10 units of 5-cubic-meter water-sprinkling trucks supplied to a Henan sanitation department and 4 units of cleaning/suction-sewer trucks delivered to a Sichuan municipal authority—to ensure practical enforceability of the clauses. II. Common After-Sales Dispute Types: How Procurement Entities Can Avoid Pitfalls In sanitation vehicle procurement, after-sales disputes primarily fall into three categories: 1. Ambiguous Responsibility Allocation: When failures occur in chassis components (e.g., engine or transmission), the chassis manufacturer and the superstructure modifier often shift blame. For example, Dongfeng chassis issues require service at authorized Dongfeng service stations, whereas superstructure-related problems must be addressed by the modifier—leaving the buyer navigating between both parties. 2. Untimely Spare Parts Supply: Some smaller modifiers maintain no local inventory; critical wear-and-tear items—such as sewage pumps and filter screens—must be shipped from distant locations, causing multi-day vehicle outages. In the Yancheng case, the buyer explicitly mandated “spare parts shipped directly within 24 hours” precisely to mitigate this risk. 3. Inadequate Technical Training: Operators unfamiliar with equipment may inadvertently damage key components through improper operation. For instance, failure to follow prescribed cleaning procedures for high-pressure pumps on sewage treatment vehicles can e