1. Sudden Shutdown of the Floor Grinding Machine: The first step is to check if the power supply and machine connections are in order When the floor grinding machine suddenly shuts down. If the power supply is intact, assess whether there are any signs of motor burnout. If everything appears normal but the machine still fails to operate, inspect whether it's due to stretched wiring or thin power lines causing insufficient voltage.

2. Deterioration or Damage to Rubber Pads: During operation, the floor grinder may experience severe shaking due to impacts from materials such as reinforcement bars, leading to damage or deformation of rubber pads. Additionally, prolonged use can cause plastic rubber pads to oxidize, losing their elasticity. Therefore, it is necessary to replace the rubber pads, typically annually under normal circumstances.

3. Uneven Grinding Disc: An uneven grinding disc can cause severe vibration during machine operation, resulting in uneven flooring. This may be caused by loose screws connecting the grinding disc to the top. The solution is to adjust the fixed screws of the grinding disc to change its height, ensuring even distance between any three points of each disc and the bottom of the gearbox.

4. Incorrect Shaft Alignment: The varying heights of grinding materials from different brands and models, coupled with differing levels of friction between different surfaces and materials, can alter the machine's balance point.

5. Damage to Grinding Bed Bearings: Damaged bearings manifest as loud noises during machine operation, shaft output shaking, and overall instability of the gearbox. This situation typically arises due to bearing overload and damage caused by aged gearbox oil or uneven grinding discs after prolonged machine operation. If bearings are damaged, it is necessary to open the gearbox to identify the affected bearing components for replacement.