Many vehicles, particularly those like vacuum cleaning trucks, often suffer from oil leakage issues. This directly impacts the technical performance of the vacuum cleaning trucks, leading to waste of lubricating oil and fuel, reduced power consumption, compromised vehicle cleanliness, and environmental pollution. Due to oil leakage and decreased internal lubricant, there is poor lubrication and insufficient cooling, which can cause premature wear of mechanical parts and even leave potential accident hazards. Let's take a look at the oil leakage situation in vacuum cleaning trucks!

Common Causes of Oil Leaks in Cleaning and Draining Trucks

1. Poor product (accessory) quality, material, or craftsmanship; issues with structural design.

Improper assembly speed, unclean mating surfaces, damaged, misplaced, or improperly installed gaskets not following the operation procedures.

3. Uneven torque on the nuts, broken threads, or loose and fallen fasteners lead to operational failure.

4. Seal materials can experience excessive wear, aging, deterioration, and deformation over long-term use.

Excessive lubricant addition, overfilling the oil level, or using the wrong oil type.

6. Component (rim covers, thin-walled parts) joint surfaces exhibit bending and deformation, leading to shell damage and the leakage of lubricating oil.

7. After the通气塞 and one-way valve are blocked, due to the pressure difference between the inside and outside of the casing, oil leakage is often caused at the weak sealing points.

Preventive Measures Against Oil Leaks in Cleaning and Suction Trucks

1. Emphasizing the role of gaskets. The gaskets between automotive components in stationary areas (such as joint surfaces, end caps, casings, pad washers, and flat enamel cover plates, etc.) serve as leak-proof seals. If they do not meet technical specifications in terms of materials, manufacturing quality, or installation, they fail to provide the necessary sealing and may even lead to accidents. For instance, oil sumps or valve covers, due to their large contact area and difficulty in being compressed, can cause oil leaks.

All bolts on the vehicle must be tightened to the specified torque. Over-loosening can lead to leakage due to insufficient pressure on the gasket; conversely, over-tightening can cause metal deformation around the bolt hole or the screw thread to become loose, resulting in oil leakage. Additionally, if the oil pan drain plug is not tightened or becomes loose and falls out, it can easily cause engine oil loss, which may lead to engine damage such as "worn bearing and seized shaft."

3. Timely replacement of worn-out oil seals is essential. Many moving parts on the vehicle (such as oil seals and O-rings) can leak due to improper installation, misalignment between the shaft neck and the oil seal cutting edge, or misalignment. Some oil seals can lose their elasticity over time due to rubber aging. Leaks should be addressed promptly and replaced.

4. Prevent the one-way valve and vent valve from becoming blocked. This can lead to an increase in the internal temperature of the housing, with oil and gas filling the entire space and not being able to be discharged, causing the internal pressure of the housing to rise, increasing lubricant consumption, and shortening the replacement cycle. After the engine ventilation system is blocked, it increases the resistance of the piston movement, leading to increased fuel consumption. Due to the pressure difference between the inside and outside of the housing, it often causes oil leakage at weak sealing points. Therefore, regular inspections, unblocking, and cleaning of the washing and suction truck are required.

5. Effectively resolve various oil pipe joint seal issues. Automotive union nuts are frequently disassembled, which can lead to thread stripping and loosening, causing oil leakage. To replace the union nuts, use the lapping method to address the sealing cone surface, ensuring the nut is tightly pressed to achieve a seal.

6. Prevent hub oil leakage. Excessive lubricating grease in the hub bearing and cavity, improper oil seal assembly, poor quality, and aging failure; frequent braking causing excessive hub temperature; loose wheel hub nuts, etc., can lead to oil leakage from the hub. Therefore, use the "cavity lubrication method (i.e., proper lubrication)" and clear the ventilation holes.