Daily Maintenance and Standard Operating Procedures for Sanitation Vehicles Compiled by: Chengli After-Sales Service Department Date: May 2026 Preface Sanitation vehicles operate under significantly different conditions compared to standard trucks, necessitating maintenance routines based on actual operating hours. Upon vehicle delivery, it is recommended to replace engine oil and transmission gear oil once each, and perform routine maintenance on chassis accessories. I. Lubricant Selection Standards (A) Chassis Lubricants 1. Engine: Diesel engines require diesel engine oil; gasoline engines require gasoline engine oil. Viscosity grade shall be selected according to local climate conditions and the chassis operation manual. 2. Transmission and Rear Axle: Standard gear oil is suitable for normal operating conditions; in harsh environments (e.g., extreme temperatures, high dust levels), select gear oil with an appropriate viscosity grade. 3. Drive Shaft: Grease regularly; use grease with a specified grade suitable for local environmental conditions (e.g., low-temperature or high-load variants). 4. Brake Fluid and Power Steering Hydraulic Fluid: Select viscosity grade based on ambient temperature. (B) Body-Mounted Equipment Lubricants 1. Power Take-Off (PTO): Use gear oil. 2. Drive Shaft, Gear Pump, and Hydraulic Cylinders: Apply grease and hydraulic fluid. In central China regions, standard-grade products are acceptable; for demanding applications (e.g., heavy-duty cycles, extreme temperatures), higher-grade fluids/greases are recommended. II. Scheduled Maintenance Intervals 1. Engine Oil: Inspect and replace every 2–3 months under high utilization. 2. Transmission + PTO Gear Oil: Inspect and replace every 1.5–2 months under high utilization. 3. Gear Pump Hydraulic Oil: Replace after cumulative operation of 35–50 hours. 4. Drive Shaft (Splined Yoke): Grease regularly. III. Daily Maintenance Tasks 1. Radiator and Sewage Tank Anti-Freeze & Corrosion Protection • During non-operation or long-term parking: Drain all water via drain ball valves in piping systems and sewage tank drain valve; store vehicle in a sheltered, heated facility. • Corrosion Prevention: After daily operation, thoroughly rinse the sewage tank with a high-pressure water jet; once dry, apply waterproof, leak-proof sealant. • Ball Valve Maintenance: After draining, rotate valve to 45° position to prevent freezing and seizing; if difficult to operate, inject grease and cycle valve repeatedly to restore function. 2. Critical Bolt Tightening • Within first 2–3 days of operation: Tighten all major frame U-bolts, pipeline flange bolts, and frame connection plate bolts. • Routine checks: Regularly inspect and tighten bolts securing the PTO and gear pump housing. 3. Hydraulic and Drivetrain Maintenance • Grease all hydraulic system grease fittings at scheduled intervals. • Inspect CAN-based intelligent control display, PLC bus control wiring, and control cabinet—ensure seals remain intact, no physical damage or short circuits exist. • Periodically inspect and tighten all hydraulic line connections and mounting bolts. IV. Correct Operating Procedures 1. Start the vehicle and ensure safe parking before operation. 2. Power on the electronic control system and connect the wireless remote control panel. 3. Execute required functions via the CAN intelligent display or PLC bus control system. V. Special Instructions for Compactor Garbage Trucks (A) Hydraulic System Standard Pressure Settings • Maximum System Protection Pressure: 16 MPa (set by pressure relief valve). • Normal Operating Pressure Range: 15–25 MPa (25 MPa represents absolute upper limit). • Recommended Pressure by Wheelbase:  – 2.8–3.3 m: 15–16 MPa  – 3.8–4.5 m: 16–18 MPa  – ≥5.0 m / tandem rear axle: 18–19 MPa  – Two- or three-axle tractor semi-trailers: 19–25 MPa (B) Hydraulic System Operating Principle Engine