By mastering these points, novices can use the concrete leveling machine easily !

    Selecting a second-hand polishing machine is a job that requires a lot of experience and skills. It can help you obtain a practical device at a lower cost, but if you make a wrong judgment, the subsequent maintenance and delayed construction period may cause you to lose more than you gain. The following is a detailed list of key points for choosing a second-hand polishing machine and common methods to avoid pitfalls. We hope it can be of great help to you. Fuselage structure Chassis (grinding disc) : This is the most crucial part. Check if it is flat and free of deformation. Slight wear and tear is normal, but if the wear is severe, there are pits or obvious deformation, it will lead to poor polishing effect and higher replacement cost. Blade (scraper) : Check if there is still sufficient thickness. If the metal substrate has been worn out, it needs to be replaced immediately, and this cost should be included in the cost. Protective cover: Check for any damage or severe deformation, as this is related to operational safety. Overall framework: Check for any signs of welding, cracks or repairs, which could be a sign of severe impact or drop. Engine (heart) Brand: Give priority to well-known brands such as Honda, Kohler, Briggs & Stratton, etc. Spare parts are easy to find and maintenance is convenient. Appearance: Check for any cracks in the engine casing, especially in the base and radiator sections. Check for obvious oil stains or carbon deposits. This might be a sign of oil leakage or poor maintenance. Air filter: You can ask to remove the air filter to have a look. If the inside is very dirty or even soaked with oil, it indicates that the previous owner might not have paid much attention to maintenance. Engine oil: You can pull out the oil dipstick to check. If the engine oil is black, viscous or contains metal debris, it indicates that the engine wear may be relatively severe and the maintenance condition is poor. Transmission system Gearbox: Check if there are any signs of oil leakage on the gearbox housing. Rotate the drive shaft by hand to feel if it is smooth, and if there is any jamming or abnormal noise. Belt/chain: Open the protective cover and check if the belt has cracks, wear or looseness. Check if the chain is loose and free of oil and rust. Be sure to ask the seller to start the machine for testing! Startup performance Cold start is the most illustrative. Observe whether the rope pulling is smooth and whether the machine can start smoothly within one to three rope pulls. If it is difficult to start, there may be problems (such as carburetors, spark plugs, insufficient compression, etc.). Engine sound After starting, listen to the sounds of the engine idling and accelerating. The operation should be smooth. A regular "tap-tap" sound is normal (valve sound). If there are loud "clicking" sounds, knocking sounds or irregular noises, it indicates that there is severe wear inside. Transmission system sound Let the trowel run idle and listen for any abnormal "clattering" sounds from the gearbox and transmission parts. The voice should be even and deep. Vibration condition When the machine is running, it should be smooth and the vibration should be within a reasonable range. If the vibration is abnormally severe, it may be due to deformation of the chassis, unbalanced installation of the blades or problems with the engine base Purchase time and source: Inquire about the specific year and channel of purchase of the machine to determine its service life. Usage frequency and scenarios: Is it for occasional household use or long-term high-intensity use by professional teams? The latter naturally wears out more severely. Maintenance and repair history: This is of Paramount importance. Has there been any major overhaul? (Such as engine cylinder opening, gearbox replacement When was the last time the engine oil, air filter and spark plugs were changed? Have there been any accidents (such as tipping over or collision)? A reliable seller will tell the truth, while a evasive one needs to be on guard. If possible, conduct a brief load test (such as grinding it on the ground). Observe after the load is applied: Whether the engine is prone to stall and whether the power is sufficient. Check for any slippage or abnormal noise in the transmission system. Whether the machine moves smoothly and if it deviates. Trap description: Merchants thoroughly clean and paint the machines to make their appearance look as good as new, thereby covering up internal wear and tear and malfunctions. Avoidance methods Pay special attention to the screws and interfaces: It is very difficult for a refurbished machine to have no signs of any screws being turned. Check whether there are any signs of wear on the engine fixing screws, chassis screws, etc. Paint surface consistency: The original factory paint surface is usually uniform. If you find that the paint color of some parts does not match the overall color or the paint layer is too thick, it might be due to later spraying. Don't judge a machine by its appearance: Don't be deceived by a clean exterior. The key is to check its operating status and internal wear. Trap description: The machine was once sold after its chassis and frame were deformed due to a fall or collision. It was sold after simple repairs. Avoidance methods Check the flatness: Place the machine on a flat ground and observe from the side whether the chassis is fully in contact with the ground and if there is any warping. Check the welding points: Carefully inspect each connection point of the rack to see if there are any irregular or rough welding points in the later stage. Running test: During no-load operation, observe whether the machine is stable and if there is any regular swinging. This might be a sign of an uneven chassis. Trap description: Piecing together a complete machine with "good" parts from different scrapped machines, which has poor compatibility and stability. Avoidance methods Brand consistency: Check whether the brand, model and newness of the main components such as the engine and fuselage match. Assembly machines often give the impression of being "mismatched". Check the nameplate: Whether the information on the body nameplate (such as model and production date) is consistent with the seller's description. Poor comprehensive operation: When the assembly machine is in operation, various minor problems may occur frequently, making it feel "not smooth". Trap description: The machine performs okay when it is cold or unloaded, but once it is heated up or loaded, problems become apparent (such as insufficient power, severe abnormal noises, and engine stalling). Avoidance methods Persist in long-term testing: Let the machine run for 10 to 15 minutes and observe whether the state is stable after warming up. Load testing is required: This is the best way to verify the true state of the machine. Check the engine oil: After warming up the machine, stop it immediately and check the engine oil. If there are many small bubbles (emulsions) in the engine oil, it might be that the cylinder gasket is being washed away, which is a big problem. Before deciding to purchase, quickly check the following list: Inspection items Qualification standard Be cautious/give up Fuselage chassis Smooth, evenly worn, and without deformation Deformation, cracks, wear limit Engine Well-known brand, smooth start-up, stable operation, pure sound, no oil leakage Difficult to start, severe abnormal noise, oil leakage, and heavy smoke Transmission system The rotation is smooth without any abnormal noise, and the belt/chain is not aged There is abnormal noise, jamming and oil leakage Seller Description Be honest, answer all questions, and keep clear maintenance records Vague and evasive, concealing history Price In line with market conditions (approximately 30% to 50% of a new model) Far below the market price (" There's no such thing as a free lunch ") Test run situation The hot and cold units start well and operate stably under no-load or load conditions Any test is unqualified Final suggestion: If possible, bring along an experienced master craftsman or mechanic. Their experience can help you discover many problems that beginners fail to notice. When making a purchase, it is best to sign a simple written agreement with the seller, clearly stating the condition of the machine, and keep the payment voucher for unexpected needs. Remember, the primary principle when purchasing second-hand equipment is "It's better to miss out than to buy wrongly." Wish you could find a sturdy and durable good machine!   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.    

  – Correct starting position: When starting the trowel, it is important to place it in an area where the concrete surface is flat and has been preliminarily processed (such as vibrated and scraped). If it is started in an uneven place or with debris, the trowel will be subject to uneven resistance at the beginning, which may cause the trowel blade to jump, thereby affecting the trowel effect. For example, on the newly poured concrete floor, if there are protruding stones or uncompacted parts, after starting the trowel, the trowel blade is likely to vibrate here, causing wavy patterns on the surrounding ground. – Stable starting speed: Starting the trowel smoothly can avoid the trowel blade suddenly accelerating and causing impact on the ground. For electric trowels, avoid quickly connecting the power supply to cause the motor to run at a high speed instantly; for gasoline trowels, when starting, you should follow the operating procedures and slowly pull the starting rope to allow the engine to gradually reach the working speed. If the starting speed is too fast, the impact force between the trowel and the ground is too large, which may leave scratches on the ground or cause partial peeling of the mortar layer on the concrete surface.   – Travel speed control: The travel speed of the trowel directly affects the quality and efficiency of the trowel. If the speed is too fast, the trowel will stay in each area for too short a time, and the concrete surface cannot be fully compacted and smoothed, which can easily cause the ground to be rough and uneven. If the speed is too slow, although the trowel effect can be more refined, it will reduce work efficiency. For example, when troweling a large area of ​​industrial plant floor, it is generally more appropriate to keep the travel speed at 3-5 meters per minute, which can not only ensure the quality of troweling, but also improve work efficiency to a certain extent. – Travel track planning: A reasonable travel track can make the trowel effect more uniform. Usually, a zigzag, circular or spiral travel track is used. The zigzag track is suitable for narrow and long areas, so that the trowel can fully cover every corner; the circular and spiral tracks are suitable for large circular or square areas, which can ensure that the trowel can evenly trowel from the center to the periphery or from the periphery to the center. If the walking track is chaotic, such as turning randomly or repeatedly over-troweling in certain areas, it will cause uneven troweling of the ground, high and low differences or local over-troweling.   – Adjust pressure according to stage: Different pressures need to be applied at different stages during the troweling process. In the rough grinding stage after the initial setting of concrete, a larger pressure can be appropriately applied to compact the concrete surface and eliminate bubbles and pores. In the fine grinding stage, the pressure should be reduced so that the trowel slides gently on the ground, mainly used to improve the finish of the ground. For example, during rough grinding, the hand-held trowel can increase the pressure by pressing the operating handle appropriately; during fine grinding, the handle is relaxed to let the trowel contact the ground naturally. If the pressure is not properly controlled, excessive pressure during the fine grinding stage may damage the ground that has been initially leveled, resulting in new scratches and unevenness. – Importance of even pressure: Ensure that pressure is evenly distributed on the trowel blade, whether in the rough or fine grinding stage. Uneven pressure can cause some parts of the trowel blade to exert too much force on the ground, while other parts exert insufficient force, resulting in local unevenness and inconsistent gloss on the ground. Operators need to achieve even pressure through skilled operation and good control of the trowel.   – Special tools or techniques for corners: For areas such as corners and edges that are difficult for the trowel to cover directly, operating skills are particularly critical. You can use a small handheld trowel or a special corner trowel tool for processing. When using a handheld trowel, keep it perpendicular to the corner or edge and rotate it slowly with a small radius to ensure that the concrete in the corner can be fully compacted and smoothed. Without the correct corner treatment skills, these areas can easily be overlooked, resulting in uneven and rough corners, affecting the finishing quality of the entire floor.

  This includes: Daily maintenance: Before and after operation, check the laser system, screed head, tires/tracks, fuel/battery level, and lubrication status, and clean concrete debris from the equipment surface.   Weekly maintenance: Check the vibration system bolt tightness, hydraulic oil level, and cleanliness, replace the air filter element, and lubricate key joints.   Monthly maintenance: Thoroughly inspect the hydraulic line seals and electrical connections, test the laser transmitter accuracy, and inspect the screed head for wear.   Quarterly/every 500 hours: Replace the hydraulic oil, engine oil, and filter element, perform a thorough overhaul of core components such as the engine and vibration motor, and calibrate the laser control system.   Regular maintenance can extend the life of the equipment and ensure construction accuracy. It is recommended to adjust the frequency based on the equipment manual and actual operating conditions.   Also, be sure to carefully read the manufacturer's product manual and consult with the manufacturer's professional technicians to accurately understand the maintenance frequency and intensity required for your specific equipment model, so that you can perform professional and standardized maintenance on your concrete laser screed. This process ensures that the maintenance plan is highly compatible with the equipment characteristics, minimizes the risk of failure due to improper maintenance, and provides reliable protection for the long-term stable operation of the equipment.   Click the below to jump immediately!!!     ARMOUR JOINT CONCRETE LASER LEVELING MACHINE LIGHT TOWER POWER TROWEL SLIPFORM MACHINE STEEL FIBER TOPPING SPREADER TRACKED MINI DUMPER