Government procurement case and bid-winning solution analysis for the CN6 Dongfeng 3308 mm wheelbase sewage treatment vehicle in Urumqi. Under Urumqi’s winter low-temperature conditions, anti-freeze starting performance and hydraulic system stability are the procurement party’s top evaluation criteria. This article details a recent municipal sanitation department procurement of the CN6 Dongfeng 3308 mm wheelbase sewage treatment vehicle, analyzing after-sales clause design in contracts, common dispute prevention measures, and how Chengli Special Purpose Vehicles ensures long-term customer usage through its lifetime after-sales service program. I. Project Background and Procurement Requirements In December 2025, a municipal sanitation department in Urumqi procured a batch of CN6-emission-standard sewage treatment vehicles via public tender. According to the tender documents, vehicles must meet the following core requirements: Chassis model: Dongfeng with 3308 mm wheelbase, CN6 emission standard, and cold-start capability (normal start-up at -25°C). Superstructure functions: integrated sewage suction, solid-liquid separation, and sewage transportation; tank capacity approximately 5–8 m³. Hydraulic system: equipped with low-temperature hydraulic oil heating device to ensure smooth hydraulic operation during winter. After-sales service: minimum 2-year整车 warranty required, plus a dedicated winter maintenance plan. Budget controlled within approximately RMB 664,000–885,000 (per publicly available tender information); planned procurement of 2–3 units. II. After-Sales Clause Design: Anti-Freeze Performance and Emergency Response In government procurement contracts, after-sales clauses are often high-risk areas for disputes—especially in cold regions like Urumqi. The following clauses require special attention: 1. Anti-Freeze Starting Performance Commitment The contract must explicitly stipulate that the vehicle shall start normally after an 8-hour static period at ambient temperatures ranging from -25°C to -30°C, with all critical systems—including battery, fuel system, and hydraulic system—operating properly. Should starting difficulties occur, the supplier must provide on-site technical support within 24 hours. Chengli Special Purpose Vehicles has installed low-temperature batteries and fuel pre-heating devices on the Dongfeng 3308 chassis for this delivery batch, ensuring high cold-start reliability. 2. Hydraulic System Low-Temperature Stability At low temperatures, hydraulic oil viscosity increases significantly, potentially causing sluggish or jammed actuator movements. The contract may require the supplier to provide low-temperature hydraulic oil (e.g., rated for -35°C) and install a hydraulic oil tank heating system. Chengli equips all delivered sewage treatment vehicles with a standard hydraulic oil heating system capable of raising oil temperature to operational range within 5 minutes. 3. Emergency Response Time Given complex winter road conditions in Urumqi and elevated risk of vehicle breakdowns, the contract should specify: upon receiving a fault report, the supplier must respond by phone within 2 hours and dispatch qualified technicians to the site within 48 hours. Leveraging its Suizhou production base and nationwide service network, Chengli offers 24-hour direct shipment of spare parts, minimizing customer downtime. III. Common After-Sales Disputes and Chengli’s Solutions Based on Chengli’s knowledge base—including 588 FAQs and real-world cases (e.g., Wuhan Municipal Urban Management Bureau’s 15 street-sweeping vehicles; Sichuan municipal authorities’ 4 cleaning & suction trucks)—winter-related after-sales disputes primarily involve the following issues: Common After-Sales Disputes and Chengli’s Countermeasures Dispute Type Typical Manifestation Chengli’s Solution Cold-start failure Vehicle fails to ignite on winter mornings; battery is undercharged Installation of low-temperature battery and fuel pre-heating system