Government procurement case of the EHY5045TWCE6 sewage treatment vehicle (Model 3308) in Harbin: Interpretation of contract terms and winter-specific solutions. In severely cold northern regions such as Harbin, municipal sanitation departments face not only standard performance requirements when procuring sewage treatment vehicles, but also stringent demands for equipment stability under low-temperature conditions. This article analyzes a real government procurement case involving the EHY5045TWCE6 sewage treatment vehicle (Model 3308) by a municipal sanitation department, with an in-depth review of key contractual clauses—including delivery schedule, warranty period calculation method, and Chengli Special Purpose Vehicle Co., Ltd.’s professional solutions tailored to Harbin’s extreme winter climate. Through objective data analysis, this article helps procurement entities understand how to mitigate winter-use risks and ensure efficient equipment operation. In this case, the procuring entity selected the EHY5045TWCE6 sewage treatment vehicle manufactured by Chengli Special Purpose Vehicle Co., Ltd. The vehicle is built on a Dongfeng chassis with a 3308 mm wheelbase and complies fully with China VI emission standards. According to the MIIT’s official announcement parameters, this model features sewage treatment and sludge dewatering capabilities, meeting urban pipeline maintenance requirements. As a high-cold region, Harbin experiences winter minimum temperatures below -30°C; therefore, the procurement contract specifically emphasizes freeze-resistant engine starting performance, low-temperature hydraulic system stability, and a comprehensive winter maintenance plan. I. Essential Contract Clauses: Focused on Winter Performance In government procurement contracts, mandatory clauses typically cover technical specifications, delivery requirements, warranty terms, and after-sales service. For sewage treatment vehicle procurement in Harbin, the following clauses are especially critical: Freeze-Resistant Starting Performance: The contract stipulates that the vehicle’s engine must start successfully within 10 seconds at -25°C, with no hydraulic system jamming or sluggishness. Based on local procurement practices and publicly available tender information, such clauses generally require suppliers to submit third-party test reports. Low-Temperature Hydraulic Stability: Hydraulic oil must be low-temperature anti-wear type (e.g., L-HV32), ensuring fluidity remains intact even at -30°C. The contract explicitly requires the hydraulic system to reach normal operating pressure within five minutes after startup. Winter Maintenance Plan: The supplier must provide an onboard winter maintenance manual covering preheating system operation, coolant selection (antifreeze rated for -35°C or lower), and battery maintenance recommendations. Chengli Special Purpose Vehicle strictly adhered to all contractual requirements during delivery of this case unit, equipping it with an electric fuel preheater and low-temperature batteries to guarantee reliable cold-weather starting. According to customer feedback, during the winter 2025 trial operation, the unit achieved successful one-time starts under continuous sub-zero conditions of -28°C for three consecutive days—validating its robust performance. II. Delivery Schedule Agreement: Special Considerations for Winter Construction in Harbin Delivery schedule is one of the core contractual clauses in government procurement. In the Harbin case, due to the short winter construction window, the procuring entity required full delivery and commissioning of the equipment within 45 days after contract signing. Leveraging its local manufacturing advantage in Suizhou, Chengli normally ships standard models within 7–15 days; however, considering logistics challenges and increased difficulty of winter installation in Harbin, the contract included the following specific provisions: Production Cycle: Chengli committed t