1. Engine System: Cooling and Overheat Prevention

1. Cooling System Deep Maintenance

• Check the antifreeze freezing point (should be ≤-15℃ in summer), replace expired coolant, and clean the radiator surface of catkins and dust to ensure heat dissipation efficiency.

• Regularly activate the fan clutch to test high-speed operation and prevent overheating caused by silicone coupler failure.

2. Fuel System Vapor Lock Prevention

• Inspect fuel pipeline tightness to avoid vaporization under high temperatures; keep the fuel tank at over 80% capacity to reduce fuel pump temperature.

2. Hydraulic System: Temperature Control and Aging Prevention

1. Hydraulic Fluid Condition Monitoring

• Maintain hydraulic oil temperature below 80℃. If exceeded, check for radiator blockages and replace contaminated oil (below NAS 8 level).

• Replace the fuel tank breather filter to prevent moisture-induced oil emulsification.

2. Pipeline Joint Inspection

• Prioritize checking the chrome plating on cylinder pistons, repairing scratches promptly; tighten high-pressure oil pipe clamps to avoid leakage under high temperatures.

3. Electrical System: Moisture and Short Circuit Prevention

1. Wiring Harness Insulation Enhancement

• Wrap engine compartment wiring with high-temperature-resistant tape. Check battery electrolyte density (1.26–1.28g/cm³) and maintain charging voltage within 14.5V.

• Clean dust from the distribution box and test relay contact resistance to prevent high temperatures from poor contact.

2. Sensor Protection

• Seal speed sensor and temperature sensor interfaces with waterproof silicone to avoid signal anomalies from rainwater ingress.

4. Chassis and Travel System: Wear and Looseness Prevention

1. Track/Tire Maintenance

• Protect rubber tracks from direct sunlight by covering them with a sunshade when parked; maintain tire pressure at 90% of the standard value to prevent high-temperature blowouts.

• Inspect idler wheel oil seals, replace aged O-rings, and apply lithium-based grease (NLGI 2 grade).

2. Structural Connection Check

• Retighten slewing ring bolts with a torque wrench (per manual specifications) and apply threadlocker to prevent vibration-induced loosening.

5. Cab and Air Conditioning System: Cleaning and Antibacterial Care

1. Air Conditioning Deep Maintenance

• Replace the AC filter, clean the evaporator with antibacterial agent, and run the internal circulation for 15 minutes to eliminate mold odor; check compressor belt tension (deflection 10–15mm).

2. Operating Environment Optimization

• Replace aged seals and place silica gel desiccants under the dashboard to prevent moisture-induced button malfunctions.

Summer Maintenance Schedule

Emergency Handling Points

• If engine water temperature exceeds 95℃, idle for 5 minutes to cool down—never add cold water directly.

• For hydraulic system leaks, use high-temperature-resistant sealant (≤120℃) temporarily and seek repair promptly.

• Disconnect the battery negative terminal during thunderstorms to prevent lightning damage to the ECU.

Targeted maintenance can reduce summer construction machinery failure rates by 40% and extend key component life by over 25%.