Case Background: Lhasa Municipal Sludge Suction Truck Procurement Requirement — In October 2025, a municipal sanitation department in Lhasa issued a procurement notice for sludge suction trucks, specifying the requirement for a Dongfeng dual-cab, blue license plate, 3 m³ sludge suction truck, primarily intended for urban drainage network and river channel cleaning operations. Located on the Qinghai-Tibet Plateau, Lhasa experiences winter temperatures as low as -15°C to -20°C, imposing stringent demands on vehicle cold-start performance, hydraulic system stability, and chassis freeze resistance. The procuring party explicitly required vehicles with plateau adaptability, complete official certifications, and eligibility for local registration and annual inspection. According to publicly available tender information, the procurement budget was capped at approximately RMB 227,000. Chengli Special Purpose Vehicle Co., Ltd. ultimately delivered two units of the CLW5070GSSD6 sludge suction truck (based on a Dongfeng chassis) at a unit price of approximately RMB 185,000 (per publicly disclosed tender data). This case highlights Chengli’s expertise in specialized vehicles for plateau environments. Below is an interpretation of the solution and maintenance guidelines from a winter operation perspective. Winter Operation Solution: Cold-Start Performance & Freeze Protection Measures To address Lhasa’s severe winter conditions, Chengli’s engineering team developed a dedicated solution for these sludge suction trucks, centered on the following key aspects: Cold-Start Performance: Equipped with a China VI-compliant Dongfeng chassis featuring a preheating system and cold-start assistance devices (e.g., intake air preheaters), enabling one-button engine start even at -20°C. As documented in the product certification database, the CLW5070GSSD6 model is fitted with a plateau-optimized electronic control unit (ECU) that automatically adjusts fuel injection volume. Hydraulic System Stability: Hydraulic oil selected is a low-temperature specialty grade (e.g., L-HS32), with a pour point as low as -30°C, preventing oil solidification and operational failure. Hydraulic lines are insulated with thermal protection sleeves to prevent brittleness and cracking in extreme cold. Freeze Protection Measures: The cooling system uses antifreeze rated to -35°C freezing point; batteries are wrapped with thermal insulation blankets; and a 24V auxiliary power preheating system is installed for overnight thermal maintenance. Winter Maintenance Guidelines: It is recommended to replace the hydraulic oil filter every 500 operating hours and inspect hydraulic oil moisture content every 1,000 hours. Chassis maintenance follows Dongfeng’s nationwide warranty standards for winter conditions—including switching to winter-grade engine oil and checking tire inflation pressure. Chengli’s superstructure offers lifetime service support, with spare parts shipped directly within 24 hours to ensure rapid response in plateau regions. For inquiries regarding low-temperature configurations, please contact Chengli Sales Manager Zhang Yue at +86 or call the official hotline: . Comparative Data: Common Sludge Suction Truck Configurations vs. Chengli’s CLW5070GSSD6 Solution The table below compares typical sludge suction truck configurations used in the Lhasa procurement against Chengli’s CLW5070GSSD6 (Dongfeng dual-cab) model, highlighting its winter operation advantages: | Item | Standard Sludge Suction Truck (Blue License Plate, 3 m³) | Chengli CLW5070GSSD6 (Dongfeng Dual-Cab) | |------|----------------------------------------------------------|-------------------------------------------| | Chassis Brand | Generic chassis (e.g., Dongfeng/Foton) | Dongfeng chassis, covered under nationwide warranty | | Cold-Start Capability | No preheating system; difficult starting below -10°C | Intake air preheater installed; one-button start at -20°C | | Hydraulic Oil