How to choose a concrete leveling machine

    Unexplained stalling of a power trowel is a common but headache-inducing problem. To conduct a systematic investigation, one can follow the principle of "from simple to complex and from outside to inside". The following is a detailed investigation of multiple possibilities. You can start checking from the simplest and most likely cause: Possibility: The fuel has expired and deteriorated (gelatinized), water has been mixed in, the fuel grade is incorrect or the fuel quality is too poor. Investigation and resolution: Check the color and smell of the fuel. Fresh gasoline is transparent, while spoiled gasoline will turn yellow or have a pungent smell. Immediately empty the old fuel tank completely and then refill it with clean, fresh unleaded gasoline of grade 92 or above. It is recommended that the fuel tank not be filled with oil for a long time. Possibility: The vent hole of the fuel tank cap is blocked, causing a vacuum to form inside the fuel tank and preventing the fuel from flowing down. Troubleshooting and resolution: When the engine is turned off, immediately open the fuel tank cap to listen for a "sizzling" sound of air intake. Or next time when the engine is turned off, try loosening the fuel tank cap to see if it returns to normal. Clean the vent of the fuel tank cap or replace the fuel tank cap. Possibility: The main fuel gauge hole, idle fuel gauge hole and other parts inside the carburetor are blocked by impurities and gum, resulting in poor fuel supply. Troubleshooting and resolution: Check if the fuel filter (if any) is dirty. Try repeatedly pressing the "oil bubble" on the carburetor (if any). Cleaning the carburetor is the most efficient solution. The carburetor needs to be removed and all oil lines and measuring holes thoroughly rinsed with carburetor cleaner. For old machines, the cost of directly replacing a new carburetor is not high either. Possibility: The air filter was severely clogged with dust and cement powder, causing the engine to "suffocate", resulting in insufficient air intake and stalling. Troubleshooting and resolution: Remove the air filter and observe if it is so dirty that the original color cannot be seen clearly. Clean or replace the air filter. On construction sites with a lot of dust, air filters should be cleaned more frequently (after each shift). When cleaning, use compressed air to blow from the inside out. Possibilities: Severe carbon deposits on the spark plugs, improper electrode gap, cracked porcelain body or mismatched model. Troubleshooting and resolution: Remove the spark plug and check the condition of its top. The normal one should be brown or light gray. If there is black carbon deposit, it indicates incomplete combustion. Clean the carbon deposits, adjust the gap with a feeler gauge to the requirements of the manual (usually 0.6-0.7mm), or directly replace it with a new spark plug of the same model. Possibility: The flameout wire (usually a thin wire) connected to the spark plug has poor contact, short circuit or open circuit, causing the spark plug to accidentally shut off. Troubleshooting and resolution: Check whether the connection of the flameout wire is loose and whether the insulation is damaged. You can try temporarily disconnecting the flameout wire (to keep the switch in operation), and then pull the rope to start it (pay attention to safety and ensure the machine is stable). If it doesn't flameout, the problem lies in the flameout switch or the circuit. Reconnect or replace the flameout wire/switch. Possibility: It is relatively rare, but the ignition coil malfunctions internally after the engine heats up, causing the spark to weaken or disappear. Troubleshooting and resolution: Usually, the machine starts up normally when cold, but suddenly shuts down after working for a period of time due to overheating, and it is difficult to restart immediately. The machine can be started again after it has cooled down. Professional maintenance personnel are required to test the resistance of the ignition coil. After confirmation, it should be replaced. Possibility: The radiator is clogged with cement or oil stains, resulting in poor engine cooling. High temperatures can cause expansion, cylinder seizure or trigger thermal protection, leading to engine stalling. Troubleshooting and resolution: Check whether the heat sinks around the cylinder are clean. Thoroughly clean the blockages on the heat sink. At the same time, check the oil level and quality to ensure normal lubrication. Possibility: After long-term use, the valve clearance changes (usually becomes smaller), causing the valves to not close tightly when the engine is hot, resulting in a decrease in the compression ratio and stalling. Troubleshooting and resolution: The cold start and low-speed operation are normal, but the engine stalls as soon as the accelerator is increased or after working for a period of time. Professional maintenance workers need to use a feeler gauge to check and adjust the intake and exhaust valve clearances to the specified values. Step 1: Check the fuel -> Change to new oil! Step 2: Check the air filter -> Clean or replace! Step 3: Check the spark plugs -> Clean/Adjust/replace! Step 4: Check the fuel tank cap -> Try loosening it! Step 5: Clean the carburetor -> This is the most likely cause! If none of the above steps can solve the problem, then the issue might be more difficult to handle (such as ignition coil or valve problems). It is recommended to contact professional maintenance services.   Note: The parameters provided in this document are for reference only and are not mandatory. Due to differences in technical characteristics between different brands and models of laser levelers, please consult the manufacturer for a suitable solution before actual operation. This reference document assumes no responsibility for any issues arising from failure to follow the manufacturer's instructions.    

    Black smoke emitted by a Power Trowel during operation is a typical malfunction phenomenon. The fundamental cause lies in incomplete fuel combustion, which leads to the direct discharge of tiny carbon particles. The following is a detailed analysis of the causes and handling measures, listed in the common order of investigation. Cause analysis: Engine combustion requires sufficient air. When the air filter is severely clogged with dust and debris, the intake volume is insufficient, resulting in the fuel injected into the cylinder not being able to mix with enough air, causing a "rich fuel" state. Unburned carbon particles then form black smoke. Handling measures Stop the machine immediately for inspection. Remove the air filter element. For paper filter elements, check by shining a flashlight. If the light transmission is poor or the surface is covered with dust, they need to be replaced. For sponge filter elements, they can be thoroughly cleaned with neutral detergent, completely dried, and then a few drops of engine oil should be added and kneaded evenly before being reinstalled. Note: In construction sites with a lot of dust, the air filter should be cleaned every day or every shift. Cause analysis: Excessive fuel supply or poor fuel quality. Handling measures Check the fuel: Use fresh and clean standard-grade gasoline. Inferior or deteriorated gasoline will affect combustion. Check the oil level: Pull out the oil dipstick and check if the oil level is between the upper and lower limits. Excessive oil filling will increase the pressure in the crankcase, causing the oil to seep into the combustion chamber and participate in combustion, generating blue-black smoke. Check the dampers: The dampers are used to thicken the mixed gas during cold machine startup. If the machine remains in the off state during hot operation or normal operation, it will cause the mixture to be too rich and black smoke to be emitted. Please ensure that after the machine is started and preheated, the choke door is fully opened to the "Running" position. Clean or inspect the carburetor: If all the above three points are normal, the problem is likely to lie with the carburetor itself. Excessive mixture: If the oil level in the float chamber inside the carburetor is too high, the main orifice is worn or blocked, or the needle valve is stuck, it can all lead to excessive fuel injection. Handling: The carburetor needs to be disassembled. Thoroughly clean all oil passages and measuring holes with carburetor cleaner. This is a highly technical operation. It is recommended that it be carried out by professional maintenance personnel or that the carburetor assembly be replaced directly. Cause analysis: Ignition system failure leads to incomplete combustion. Handling measures Check the spark plugs Remove the spark plug and observe the electrode part. If the carbon deposits are severe and appear black and velvety, it indicates poor combustion. Clean the carbon deposits with spark plug cleaner or a wire brush. Use a feeler gauge to check and adjust the electrode gap to the range specified in the equipment manual (usually 0.6-0.8mm). If the ceramic part of the spark plug is cracked or the electrode is severely eroded, please replace it with a new one directly.   Cause analysis: When the concrete material is too soft, the operator presses down too deeply, or the flattening head is stuck by foreign objects, the engine will be forced to output more power due to a sharp increase in load. The control system will automatically thicken the mixture, and at this time, black smoke may be emitted briefly. Handling measures Master the correct construction timing: Start the smoothing operation when the concrete reaches the initial setting state (when a person stands on it and sinks by about 5-10mm). Standard operation: According to the hardening condition of the concrete, gradually switch from high speed and large Angle to low speed and small Angle to avoid excessive downward pressure in the initial stage.   Safety Notice: All inspections and repairs must be carried out after the engine has been completely turned off and cooled down. Preventive maintenance recommendations Regular maintenance: Replace the air filter, engine oil, spark plugs and fuel filter strictly in accordance with the user manual. Use high-quality oils: Use clean gasoline and engine oil of the recommended grade. Form good habits: Conduct a simple visual inspection before each operation, pay attention to the engine sound during operation, and stop the machine immediately if any abnormality is found. By following the principle of starting from the simple to the complex for investigation, most black smoke problems can be solved by cleaning the air filter and checking the choke.   Note: The parameters provided in this document are for reference only and are not mandatory. Due to differences in technical characteristics between different brands and models of laser levelers, please consult the manufacturer for a suitable solution before actual operation. This reference document assumes no responsibility for any issues arising from failure to follow the manufacturer's instructions.    

Detailed explanation of concrete laser leveling machine pouring leveling construction and leveling control matters 1. Preparation 1.1 After the base layer is processed, the equipment of the laser paver is debugged, and the fixed reference level point is drawn according to the original level point; the non-woven fabric is laid, the side formwork is supported, the laser transmitter is erected, and the ground level is introduced according to the original level point. Laser leveling machine. 1.2 Conveying concrete Commercial concrete is used, and the commercial concrete is transported to the entrance and exit of the garage by tank truck, and then transported to the construction site by a three-wheel dump truck. 1.3 Standard calibration Use a hand-held laser receiver to check the elevation of the floor, introduce the elevation into the laser paver, and adjust the reference point (±0.00) on the leveling machine. 2. Concrete paving Pouring steps: (1) After the formwork is supported, the warehouse should be cleaned one day in advance before pouring concrete, rinsed and soaked with water. When pouring is approaching, drain the open water and sweep the cement slurry or interface agent. At this time, no obvious water accumulation is strictly prohibited. If there is, it must be resolutely removed before paving concrete. (2) After the concrete is put down, it should be preliminarily leveled, and the leveling height should be 3 cm thicker than the elevation. Then level it with a laser paver. The corners that cannot be leveled can be leveled with a gasoline leveler or manually. (3) When the warehouse near the wall is being poured, after the leveling machine walks over, it must be scraped with a scraper in time. and so on. (4) For areas where concrete mixer trucks cannot be driven to the site, tractors should be used to transfer concrete. After the pouring is completed, the floor finishing construction begins when the concrete is initially set. (5) When the warehouse near the wall is being poured, it must be leveled with a scraper in time after the leveling machine has passed by. and so on. (6) For areas where concrete mixer trucks cannot be driven to the site, tractors should be used to transfer concrete. After the pouring is completed, the floor finishing construction begins when the concrete is initially set. 3. During construction, the laser signal received by the receiver of the laser paver (frequency of 10 times per second) automatically adjusts the elevation in real time to ensure that the construction elevation is always at the set standard. Because the laser transmitter is fixed after being set up, it can ensure that the construction of a large area of ground does not produce cumulative errors. 4. During the construction, the operator uses a hand-held laser receiver to detect the ground after the machine is constructed, and again ensures that the flatness error is within the controllable range. If there is anything you don't understand, you can consult us, and we will continue to answer for you.