Concrete mixer trucks are widely used in construction projects to transport and mix concrete efficiently. Because they often work in harsh environments such as construction sites, dusty roads, high-temperature areas, and long-distance transportation routes, regular maintenance is essential.
Proper maintenance can help reduce equipment failure, extend the service life of the truck, improve working efficiency, and ensure safer operation. This article introduces key maintenance tips for concrete mixer trucks, including mixing drum cleaning, hydraulic system care, engine maintenance, chassis inspection, tire pressure checks, water supply system maintenance, and summer operation precautions.
1. Clean the Mixing Drum Regularly
The mixing drum is one of the most important parts of a concrete mixer truck. Since concrete can harden quickly and may corrode steel and paint surfaces, cleaning the drum and the inlet and outlet areas after use is a necessary daily maintenance task.
Before each loading, rinse the feeding port with clean water to keep it moist. This helps reduce concrete adhesion during the loading process. While loading concrete, fill the cleaning water tank with water so that the truck can be cleaned in time after unloading.
After loading, wash the feeding port again and remove any remaining concrete near the inlet. After unloading at the construction site, rinse the discharge chute and add about 30 to 40 liters of clean water into the mixing drum. When the vehicle returns, keep the mixing drum rotating slowly in the forward direction to clean the inside of the tank.
Before the next loading, remember to drain the sewage from the drum. At the end of each working day, thoroughly clean the mixing drum, feeding port, discharge port, and the surrounding areas to ensure that there are no cement deposits or hardened concrete lumps.
2. Maintain the Hydraulic Drive System
The hydraulic system is the core system that drives the rotation of the mixing drum. To ensure stable operation, the hydraulic oil level of the oil radiator and reducer should be checked before starting the vehicle. The oil level should remain within the proper range.
It is also important to keep the hydraulic oil clean. Concrete mixer trucks often work in dusty and muddy environments, so sewage, sand, and dust must be prevented from entering the hydraulic system. Contaminated hydraulic oil may cause system failure or damage hydraulic components.
Hydraulic oil should be replaced regularly according to the maintenance manual. If water, sand, or other impurities are found in the hydraulic oil, the truck should be stopped immediately. The hydraulic system must be cleaned, and the hydraulic oil should be replaced.
The hydraulic oil radiator should also be cleaned regularly to prevent blockage caused by cement, dust, or mud. At the same time, check whether the electric fan of the radiator is working normally to avoid excessive hydraulic oil temperature.
3. Check the Mixing Drum Transmission System
The transmission system of the mixing drum directly affects the rotation and mixing performance of the truck. During the initial use of a new mixer truck, the bolts of the tank body and related parts should be checked after about 50 working hours to ensure that they are not loose.
Before daily operation, check the lubrication condition of the supporting wheel and raceway. The wheel cover should be opened regularly, the internal oil should be cleaned, and lubricating grease should be added when necessary.
The universal rotating part is also a common area where faults may occur. Grease should be added on time, and the wear condition should be checked frequently. If serious wear or abnormal noise is found, the component should be repaired or replaced in time.
4. Maintain the Water Supply System
The water supply system is used for cleaning the drum, feeding port, and discharge chute. It should be kept in good working condition at all times.
The water tank should be filled properly, but it is usually not recommended to keep it completely full for a long time. The valve body should be checked regularly to make sure it is not blocked and works normally.
When the mixer truck is used in cold areas where freezing may occur, the stored water in the water supply system must be drained after work. This helps prevent the pipeline, water pump, or valves from cracking due to freezing.
When the vehicle is driving, the valves in the waterway system should be closed to avoid affecting the braking performance or causing unnecessary water leakage.
5. Engine Maintenance
The engine is the power source of the concrete mixer truck. Regular engine maintenance is necessary to ensure reliable operation, especially when the vehicle works under heavy load or in hot weather.
Engine oil and oil filters should be replaced according to the engine maintenance manual, usually every 5,000 to 10,000 kilometers, depending on the working environment and vehicle usage.
The air filter should also be checked regularly. If the truck works in dusty construction sites, the air filter element should be cleaned or replaced more frequently. A blocked air filter may reduce engine power and increase fuel consumption.
The cooling system should be inspected regularly, including the radiator, thermostat, water pump, fan, coolant level, and cooling pipelines. If coolant is insufficient or the radiator is blocked, the engine may overheat.
6. Prevent Engine Overheating in Summer
Summer is a challenging season for concrete mixer trucks. High temperatures can easily cause the engine to work under greater pressure, especially during long-distance transportation or continuous operation.
Drivers should check the water temperature gauge regularly and pay attention to temperature changes. If the water temperature exceeds 100°C, the truck should be stopped immediately in a cool or shaded place for inspection and cooling.
When cooling the engine, let it idle and open the engine hood to help dissipate heat. Do not continue driving when the engine is overheated, as this may cause serious engine damage.
In summer, the engine cooling system should be inspected more frequently. Cooling water or coolant should be added in time, and the radiator should be kept clean to ensure good heat dissipation.
7. Battery Maintenance in Hot Weather
High temperatures can accelerate the evaporation of water in the battery electrolyte. If the battery loses too much water, it may affect starting performance or even damage the battery.
In summer, the battery liquid level should be checked frequently. If the liquid level is too low, distilled water should be added in time to keep it within the proper range.
The battery terminals should also be kept clean and tight. Loose or corroded terminals may cause starting problems or unstable electrical performance.
8. Tire Pressure and Tire Safety
Tire pressure is very important for the safe operation of concrete mixer trucks. Since mixer trucks often carry heavy loads, incorrect tire pressure may increase tire wear, reduce driving stability, and even cause tire failure.
In summer, high road temperatures may cause tires to overheat. Tire pressure should be checked regularly, preferably at least once every two weeks. Long-distance continuous driving should be avoided when the tire temperature is too high.
If the truck has driven through water, it is better to wait until the tire temperature drops properly before continuing to drive. This helps reduce sudden temperature changes that may affect tire performance.
It is also important not to apply grease to tire bolts and nuts. Some drivers may think lubrication can prevent rust, but this is dangerous. Lubricating oil can reduce the self-locking ability of bolts and nuts, which may cause them to loosen during operation and create safety risks.
9. Vehicle Body and Chassis Maintenance
After transporting concrete, the vehicle body should be cleaned in time with a high-pressure water gun and suitable cleaning liquid. This helps remove concrete, mud, and dust from the truck body and prevents corrosion of the paint surface and structure.
The chassis should be inspected regularly, especially the suspension system, transmission system, steering system, springs, shock absorbers, drive shaft, steering tie rod ball joints, and brake components. If any abnormal wear, looseness, or damage is found, it should be repaired or replaced in time.
Lubrication points such as universal joints, steering joints, and brake-related moving parts should be lubricated regularly to reduce friction and extend component service life.
10. Regular Instrument and Electrical System Checks
High temperatures and heavy working conditions may cause abnormal operation of electrical components and instruments. Drivers should regularly check whether the dashboard instruments work normally.
The motor, electrical appliances, wiring, and related components should be inspected for overheating, abnormal noise, or loose connections. Any problem should be handled immediately to avoid further damage.
The intake pipe and air filter element should also be cleaned regularly. Engine oil, filters, and other consumable parts should be replaced on time according to the maintenance schedule.
11. Rational Use of Concrete Additives
During construction, the proper use of external additives can help improve concrete performance and reduce cement consumption.
For example, water-reducing agents can reduce water usage while maintaining concrete workability. Fly ash can also be used to replace part of the cement in suitable applications.
For long-distance transportation, retarders can be used to control the setting time of concrete. However, the dosage must be accurate. Excessive or insufficient use of retarders may affect the quality, strength, and performance of the concrete.
12. Avoid Directly Washing Sensitive Parts with Water
Although cleaning is important, some parts of the concrete mixer truck should not be washed directly with large amounts of water.
The internal structure of some body areas is complex, with grooves, holes, and small gaps. If water remains inside these areas and cannot dry quickly, it may cause rust or electrical problems.
When cleaning the truck, avoid directly spraying sensitive electrical components, connectors, bearings, and sealed areas with high-pressure water. Cleaning should be done carefully according to the vehicle maintenance requirements.
Conclusion
Concrete mixer truck maintenance is not only about keeping the vehicle clean. It is a complete process that includes mixing drum cleaning, hydraulic system care, engine inspection, chassis lubrication, tire pressure checks, water system maintenance, and summer operation management.
Good maintenance habits can reduce breakdowns, improve working efficiency, extend the service life of the truck, and provide better safety for drivers and construction projects.
For mixer trucks working in hot, dusty, or heavy-duty environments, maintenance should be carried out more frequently. By following a regular maintenance plan, concrete mixer trucks can maintain stable performance and support the smooth progress of construction projects.
