Faults and repair of vibratory plates

Vibroplate is a type of construction machinery that is utilized for compacting different types of loose materials such as soil, sand, gravel, and crushed stone mixtures. It is commonly employed in tasks like laying paving tiles, constructing roads, compacting soil on construction sites, and various other works. Equipment that operates in tough conditions can often experience unexpected failures. There can be several reasons for these failures. However, many breakdowns can be resolved independently, without the need for assistance from service center experts. To effectively perform self-repairs, it is essential to have a thorough understanding of the working unit’s design and familiarize oneself with the most frequent breakdowns and their causes.

The device of the vibratory plate

• The equipment’s drive mechanism is responsible for its movement.
• The eccentric (vibrator) generates vibrations.
• The working (base) plate tamps the material’s surface.
• The motor frame.
• A handle is used to control the direction of travel.

Based on the drive type, vibratory plates can be classified into the following:

• Fuel-powered (diesel and gasoline).
• Electric.

Gasoline units are the most commonly used in practice. They are priced between electric and diesel models. These units are equipped with four-stroke internal combustion engines (ICE) with one or two cylinders. The motors are air-cooled, and many models do not have a gearbox.

The photo below provides a schematic presentation of the detailed structure of the gasoline vibratory plate.

The unbalanced shaft, which is placed in supports with bearings, constitutes the main component of the vibrator. To absorb vibrations, the motor frame is connected to the base plate through shock absorbers made of a combination of rubber and metal materials. To transfer the rotational motion from the motor to the vibrator, a belt is utilized. Additionally, a water tank is necessary to provide moisture to the base plate.

Manufactured from steel or cast iron, the support platform serves as a sturdy foundation. In order to enhance durability and extend the lifespan, certain additives are mixed into the metal. In more affordable models, smaller parts like gears and cams are constructed from plastic, while higher quality models feature hardened steel components. When working with paving stones or slabs, the working platform is specially adapted and equipped with a polyurethane or rubber mat.

Moreover, vibratory plates come with detachable wheels, which are essential for transporting these machines. Additionally, the handles of the machines often have pads that protect against vibrations, enhancing ease of use and minimizing the adverse effects of vibrations on the health of the operators.

For the compaction of bulk materials weighing from 0.7 tons, the equipment typically does not have handles as it is operated remotely.

Electric models of vibratory plates are connected to the power grid, with electricity supplied through a power cable that has a plug at its end. These machines are equipped with either three-phase or single-phase electric motors, and the handle of the unit is fitted with a trigger.

The SO-325 electric vibrating plate

The main faults of vibratory plates

All issues with vibrating plates are linked to their main components:

• drive;
• vibration unit;
• working sole plate and motor frame

Because the engine is the main component of the machine, the majority of breakdowns are related to it. Each type of drive has its own specific faults, so they should be dismantled separately.

Problems associated with the frame, plate, and handle are incredibly rare. Usually, these design elements function without issues for several years.

If there are minor cracks on the sole plate, handle, or motor frame, they are repaired using a welding machine. If the base is extensively worn, it is completely replaced. Additionally, new shock absorbers are often installed at the same time.

How to eliminate problems with the vibrator

One of the primary reasons for the malfunction of vibrators is the gland located on the shaft, which can leak oil. Operating the vibrating mechanism without proper lubrication can cause the gears to wear down, resulting in the failure of the entire assembly. In many cases, repairing the issue goes beyond simply replacing the affected parts, as the mating components may also be damaged. Therefore, the vibration assembly needs to be disassembled and thoroughly overhauled.

Below is a table showing other possible causes of the malfunctioning oscillating unit and their respective solutions:

To catch any issues with the vibrator on time, it is essential to keep an eye on any oil leaks. Should such leaks occur, prompt replacement of the oil seals becomes necessary.

Electric motor repair

Before examining the equipment that is fitted with an electric motor, it is necessary to initially verify the voltage level of the power supply:

• For a single-phase electric motor, it should be 220 V, with possible variations permitted according to the instructions;
• If the apparatus is equipped with a three-phase motor, the voltage should be 380 V (with allowance for variations within specified limits).

To check the voltage level in the socket, utilize a multimeter, while first determining from the instructions which value the equipment’s electric motor is intended for. Adjust the device’s switch to the appropriate range. Insert the probes into the corresponding sockets.

Multimeters and similar measuring devices are essential for inspecting electrical equipment. They can be utilized to detect the presence of open circuits and determine the normal resistance values of the electric motor windings.

The causes of electric motor issues are outlined in the table below, along with recommendations for troubleshooting and repairing the problems.

Occasionally, the motor may become jammed, although this is quite rare. This issue is typically caused by problems with the bearings. To prevent this, it is recommended to regularly lubricate the bearings as instructed in the operations manual. If the bearings show signs of significant wear, they should be replaced with new ones of the correct type.

Repair of the gasoline unit

Before beginning to repair a gasoline internal combustion engine, it is important to check a few things to ensure that the process goes smoothly. First, make sure that there is an adequate amount of fuel in the tank of the malfunctioning unit. Next, verify that the ignition switch is set to the on position. Finally, ensure that the air damper is correctly positioned. Taking these steps at the beginning of the repair will save time and prevent unnecessary disassembly of the equipment.

The main factors that can cause issues with the internal combustion engine include:

• Insufficient or low-quality oil, resulting in the engine failing to start or stopping during operation.
• A dirty air filter, leading to unstable engine performance, loss of power, or the inability to start.
• Spark plug failure, which can cause difficulty starting the gasoline engine or result in erratic operation.
• Excessive buildup of dirt or damage to exhaust system components, including the muffler, which can negatively impact the equipment’s overall performance.
• Piston wear or improper carburetor adjustment, resulting in unstable operation under load or a decrease in power.

In order to resolve the issues mentioned in the previous paragraph, it is advisable to reach out to the experts at the service center.

If the oil level is lower than the standard, built-in sensors in many modern car models will prevent the engine from starting. To verify this, follow these steps:

• Place the vehicle on a level surface (horizontally);
• Remove the oil filler cap;
• Insert the dipstick into the oil tank;
• Check the oil level indicated on the dipstick.

The oil for the vibratory plate needs to be changed regularly due to contamination. The initial change should be done after 20 hours of use, and subsequent changes should be done every 100 hours of continuous operation. It’s recommended to use high-quality lubricant. Make sure to store the oil in clean containers.

Cleaning the air filter

The process of cleaning the air filter involves the following steps:

• To start, you need to remove the air cleaner cover by unscrewing the nut.
• Next, unscrew the second nut and carefully take out the filter elements.
• The sponge filter should be thoroughly washed using warm water and a regular detergent. Once clean, it needs to be dried and then lightly moistened with engine oil. Be sure to squeeze out any excess oil.
• For the paper filter element, it is recommended to use compressed air to effectively clean it.
• Finally, reassemble the air filter, making sure all the components are properly fitted together.

Refer to the diagram below for a visual representation of the air filter and its various elements.

Checking the spark plug

To inspect the condition of the spark plug (its level of dirt, signs of wear, and the gap between the electrodes), follow these steps:

• Using a socket wrench, carefully remove the plug;
• Assess the extent of wear and check for any visible defects, such as chips;
• Compare the gap between the two electrodes with the recommended value of 0.7-0.8 mm and adjust the distance if necessary;
• If the removed plug is no longer usable, replace it with a new one.

Exhaust system maintenance

The diagram below depicts the display of the exhaust system.

Perform maintenance on the exhaust system in the following manner:

• Remove the hood by unscrewing the M5 screws;
• Disconnect the muffler and flame arrester by unscrewing the M4 screw;
• Eliminate carbon deposits using a metal brush;
• If the muffler is not damaged, reassemble the entire assembly.

If, after checking for potential malfunctions, the machinery is operational but fails to move forward, it is recommended to seek assistance from a service center.