Liuzhou National VI Dongfeng 3308 mm Wheelbase Sewage Treatment Vehicle Government Procurement Case: In-depth Analysis of Spare Parts Procurement-Based Cost Control and After-Sales Support Located in central Guangxi, Liuzhou experiences high summer temperatures and heavy rainfall, resulting in demanding urban drainage network maintenance requirements. This procurement focused on National VI Dongfeng 3308 mm wheelbase sewage treatment vehicles, with key functional requirements including rapid sewage suction, filtration, and transfer; maneuverability in narrow urban streets; and corrosion-resistant anti-rust coating to withstand the humid, tropical environment. According to publicly available tender information, the vehicle unit price ranged between RMB 250,000–320,000, with a total budget capped at RMB 3.37 million for 10 units. Chengli’s solution utilized the Dongfeng 3308 mm wheelbase chassis, compliant with the CLW5070GSSD6 model type-approval (referencing MIIT certification parameters). The superstructure featured a high-strength stainless-steel tank, enhanced with additional anti-rust coating specifically tailored for Liuzhou’s climatic conditions. Per local procurement practice, vehicles were required to meet National VI emission standards and be accompanied by a complete list of wear-and-tear parts and an official spare parts price schedule—aimed at minimizing long-term operational and maintenance costs. I. Project Background and Vehicle Selection II. Core of the Spare Parts Procurement-Based Strategy: Wear-and-Tear Parts List and Price Transparency In government procurement, spare parts price transparency directly impacts total lifecycle cost. Chengli provided the Liuzhou client with a detailed wear-and-tear parts list and published reference prices—preventing exorbitant post-warranty repair costs. Below is a summary of the wear-and-tear parts list and reference prices (RMB), compiled from knowledge base data, public tender documents, and industry-standard pricing: Wear-and-Tear Parts List and Reference Prices (Unit: RMB) | Part Name | Applicable Model | Reference Unit Price (incl. tax) | Replacement Interval (months) | Notes | |---------------------------|------------------------|-----------------------------------|-------------------------------|-----------------------------------------------------------------------| | Sewage Pump Seal Kit | CLW5070GSSD6 | 120–180 | 6–8 | Recommend shortening to 6 months in humid, tropical environments | | Tank Anti-Rust Coating Repair Agent | All Dongfeng 3308 mm wheelbase models | 350–500 per tank | 12–18 | Frequent rainy season in Liuzhou; annual inspection recommended | | Hydraulic Oil Hose | CLW5070GSSD6 | 200–300 | 12–24 | Oil-resistant and high-temperature resistant type | | Filter Cartridge | All sewage treatment vehicles | 80–120 | 3–6 | Replacement frequency adjusted according to water quality | | Rear Tire | Dongfeng 3308 mm wheelbase | 800–1,200 per piece | 24–36 | Replace earlier under challenging road conditions | | Sealing Gasket | CLW5070GSSD6 | 50–80 | 3–6 | Prone to aging in humid, tropical environments | All listed prices are based on publicly disclosed tender data and official Chengli quotations. Compared with authorized 4S channel pricing, equivalent configurations offer savings of approximately RMB 8,990–16,800 per vehicle.