Practical! Maintenance and common troubleshooting of pavers

(1) When using new machines, it is essential to attach great importance to the maintenance during the running-in period. Do not neglect the maintenance during the running-in period just to catch up with the project schedule. Otherwise, it will accelerate the abnormal wear of some components and leave hidden dangers for machine malfunctions. After the running-in period is over, necessary compulsory maintenance must be carried out. In daily use, it is essential to strictly follow the maintenance manual for timely maintenance and repair. The maintenance of the machine mainly involves lubrication, including timely addition and replacement of engine oil, grease, gear oil and hydraulic oil, etc. If the engine oil is not changed in time or substandard oil is used, it may cause the engine to burn oil. In addition, timely cleaning or replacement of the air filter element, idling for 3 to 5 minutes when starting and stopping the engine, and using qualified diesel are all necessary measures to prevent the machine from burning oil.

For systems that use automatic lubrication at key lubrication points, when the temperature is below around 20℃, No. 2 grease should be used. The automatic lubrication pump and the progressive distributor are equipped with plunger pairs, which fit very precisely. Therefore, the cleanliness of the grease is required to be very high, and there must be no solid impurities. Otherwise, it will cause faults such as wear of the lubrication pump plunger, jamming of the check valve, bending of the plunger, motor burnout, and jamming of the distributor. If the spare grease nipple of the automatic lubrication point leaks oil, a new one with good reverse sealing performance should be found and replaced. High-temperature grease is only necessary when laying asphalt materials.

(2) Lubrication of the scraper feeding chain: The scraper feeding chain comes into contact with the material and works in a harsh environment. If it is not lubricated, it will lead to rust, material adhesion, chipping, accelerated wear of the feeding chain and the bottom plate, and even material jamming and chain breakage. It is recommended to use a mixture of various waste lubricating oils and diesel for the lubrication of the scraper conveyor chain. Diesel has strong permeability and is conducive to entering the interior of the chain. Before lubrication, the material transfer and distribution switch should be opened first to clear the material in the gap, and then the cover plate in front of the hopper should be lifted. Pour the mixed oil onto the chain. Lubricate once every 1 to 3 days, after each construction.

(3) Regularly check whether there are any abnormal sounds during the paving operation of each working device, whether the engine, mechanical transmission system and hydraulic system of the paver are overheating, and whether there is any slippage during the operation of the paver.

(4) Analysis and elimination of some common faults.

1) The engine dropped speed during the laying process

Check whether the load of the paver is uneven, whether there is any rupture or leakage in the fuel supply circuit, whether the intake circuit and filter are clogged, whether the fuel of the engine is qualified and whether it contains water.

The system does not work without hydraulic oil output.

Check whether the hydraulic pump is rotating; Is the fuel in the fuel tank sufficient? Check if the oil suction filter and pipelines are clogged. Check the vacuum gauge of the oil suction filter. Replace the filter when the pressure is 25 kPa. Measure the pressure on the pressure circuit. If the pressure is very low, check and replace the relief valve. The pump does not discharge oil. Replace the pump or pipeline. Pressure fluctuation, eliminate the air intake phenomenon of the suction pipe.

2) The output hydraulic oil fails to reach the preset parameters

Check the pressure of each branch pipe and the output pressure of the oil pump, and measure the rotational speed of the oil pump and the motor. Connect the pressure gauge to measure the pressure. If the pump or motor is damaged, replace them.

3) Excessively high oil temperature

Check the oil level in the fuel tank; The contamination condition of the oil filter element; The operating status of the pump and motor. Refueling; Replace the oil filter element; Check the working condition of the relief valve and replace it as needed. Replace the damaged parts of the pump and motor.

4) Loud noise

Check if there are any bubbles in the oil tank. Check if the pipe fixation points are loose. The working status of the pump and motor. If the fuel is insufficient, add more oil. Reinforce loose connections to prevent resonance; Damaged components should be replaced in a timely manner. Expel the gas in the hydraulic circuit.

Of course, with the application and improvement of new technologies, most of the current pavers are equipped with computer fault diagnosis systems, which can accurately and promptly detect fault phenomena and locate the source of the fault. Coupled with the fault diagnosis experience accumulated during use, it can basically ensure the normal and continuous operation of the paver, and when mechanical faults occur. Early detection and elimination can fully ensure that the paver can play its due role in a large number of highway construction projects.