Luoyang City’s 3308 Sewage Treatment Vehicle EHY5045TWCE6 Government Procurement Case and Failure Rate Analysis. In municipal sewage treatment, the reliability and after-sales support of special-purpose vehicles directly impact the operational efficiency of urban infrastructure. In 2023, a municipal sanitation department in Luoyang City procured three EHY5045TWCE6 sewage treatment vehicles manufactured by Chengli Special Purpose Automobile Co., Ltd. via public tender for emergency treatment of river and pipeline sewage within its jurisdiction. This article presents an in-depth analysis—based on authentic maintenance records over three years (data current as of January 2026)—covering failure type distribution, after-sales response time, and spare parts supply assurance, while also referencing the government procurement plan to provide guidance for future acquisitions. I. Procurement Background and Vehicle Configuration The department previously operated multiple aging vacuum trucks, which suffered from low processing efficiency and frequent failures. In early 2023, following a public tender process, Chengli Special Purpose Automobile delivered three EHY5045TWCE6 sewage treatment vehicles at an approximate unit price of RMB 320,000 (per publicly available tender information). The vehicle is built upon a Dongfeng chassis, complies with China VI emission standards, and carries the official model designation CLW5070GSSD6 (per MIIT announcement parameters). It features a sewage separation system, high-pressure cleaning pump, and storage tank, with a designed treatment capacity of 20 m³/hour. At delivery and acceptance, key vehicle parameters included: chassis wheelbase of 3,308 mm, engine power of 85 kW, and effective tank volume of approximately 4.5 m³ (per CLW5070GSSD6 announcement parameters). The department reported that, immediately after initial deployment, the vehicles were deployed to address an emergency sewage leakage incident along a tributary of the Luo River—operating continuously for 72 hours without shutdown—thus preliminarily validating the equipment’s stability. II. Three-Year Authentic Maintenance Records and Failure Type Distribution Based on the department’s maintenance records (March 2023–January 2026), the three vehicles accumulated approximately 4,500 operating hours and experienced a total of 12 maintenance events. Failure type distribution is as follows: EHY5045TWCE6 Sewage Treatment Vehicle – Three-Year Failure Type Distribution Failure Type | Occurrence Count | Percentage | Typical Manifestation Hydraulic System Leakage | 4 | 33.3% | Oil seepage at hose fittings; hydraulic pump seal ring aging Sewage Pump Blockage | 3 | 25.0% | Impeller jammed due to ingestion of hard debris Electrical Control Faults | 2 | 16.7% | Control panel signal anomalies; sensor failure Chassis Engine Faults | 2 | 16.7% | Coolant leakage; fuel line blockage Tank Seal Aging | 1 | 8.3% | Minor leakage at tank flange joint Data shows hydraulic system leakage and sewage pump blockage are the predominant issues, collectively accounting for 58.3%. This correlates closely with the vehicle’s operating environment—prolonged exposure to sand, grit, and debris in sewage accelerates seal wear. Only two chassis engine faults occurred (16.7%), indicating that the Dongfeng chassis (model CLW5070GSSD6) demonstrates reliability above the industry average. Analysis of Representative Failure Cases In July 2024, Hydraulic pump oil hose on Unit #1 ruptured unexpectedly during operation, causing substantial hydraulic oil leakage.