Case Study and Bid Solution Analysis of Zibo's CN6 Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle Government Procurement Under increasingly stringent environmental policies, sewage treatment equipment has become a mandatory requirement for municipal sanitation departments. This article takes the procurement case of a CN6 Dongfeng 3308 mm wheelbase sewage treatment vehicle by a sanitation unit in a district of Zibo as its entry point, focusing on analyzing the design logic of after-sales clauses in government procurement contracts, common dispute types, and how Chengli Special Purpose Vehicle Co., Ltd. resolves industry pain points through its 'Lifetime After-Sales Service' model. I. Case Background: Procurement Practice of a Zibo Municipal Sanitation Unit In 2025, a municipal sanitation department in Zibo planned to procure a batch of sewage treatment vehicles to enhance urban drainage system maintenance efficiency, with a budget capped at approximately RMB 390,000 (based on publicly available tender information). After multiple rounds of comparison, it ultimately selected the CN6 Dongfeng 3308 mm wheelbase model manufactured by Chengli Special Purpose Vehicle Co., Ltd. This model features a Dongfeng chassis, a 3308 mm wheelbase, and complies with China VI emission standards. Its official type-approval model number is CLW5070GSSD6 (per MIIT type-approval parameters). Key functions include sewage suction, solid-liquid separation, sludge dewatering, and transport—suitable for applications such as urban pipeline cleaning and river remediation. Customer Feedback: Following delivery, the vehicle has been deployed locally in Zibo for municipal sewage treatment operations, achieving a daily processing capacity exceeding 60 cubic meters, with excellent equipment stability. The procuring party commented: 'The vehicle offers outstanding cost-performance ratio—especially the clearly defined after-sales terms, which significantly reduce concerns regarding subsequent operation and maintenance.' Mr. Zhang Yue, Chengli Sales Manager (Tel: ), was fully responsible for technical coordination and contract detail negotiations. II. Key Design Elements of After-Sales Clauses in the Contract In government procurement contracts, after-sales clauses are central to risk mitigation and long-term operational assurance. Based on the Zibo case, typical after-sales clauses should include the following: Warranty Period and Scope: Chassis components (e.g., Dongfeng chassis) follow the original manufacturer’s warranty standards—typically 2 years or 60,000 km; upper-body components (e.g., sewage tank, separation system) are covered by Chengli’s lifetime service—free repairs during warranty period; post-warranty repairs incur only material cost. Response Timeframe: Clear commitment to provide telephone technical guidance within 24 hours of fault reporting; on-site technician dispatch within 48 hours if required. Spare Parts Supply: Guaranteed same-day shipment (within 24 hours) of commonly used spare parts to ensure uninterrupted equipment operation. Training and Technical Support: Free operator training and comprehensive maintenance manuals included in the contract. In the Zibo case, the procuring party specifically stipulated that 'after-sales terms must not be ambiguous.' Chengli’s draft contract explicitly stated: 'Chassis covered under nationwide Dongfeng warranty (via Dongfeng service network); upper-body covered by Chengli’s lifetime service (via Chengli’s dedicated after-sales team); spare parts pricing fully transparent.' This directly alleviated the customer’s concerns regarding 'difficult repairs' and 'overpriced parts.' III. Common After-Sales Dispute Types and Chengli’s Solutions In special-purpose vehicle procurement, after-sales disputes primarily fall into the following three categories: Dispute Type | Typical Issue | Chengli’s Solution ---|---|--- Ambiguous Responsibility Between Chassis and Upper Body | Engine fa