SPG stands for Special Packing Grease, and SPGO stands for Special Packing Grease Open. Both SPG and SPGO are types of hydraulic seals that are designed to provide a high level of sealing performance in harsh environments. They are typically made of a combination of nitrile rubber and grease. The grease acts as a lubricant and also helps to prevent the seal from wearing out.

SPG seals are typically used in hydraulic cylinders and other hydraulic components that are subjected to high pressures, temperatures, and speeds. They are also used in applications where the seal is exposed to dirt, dust, and other contaminants.

SPGO seals are similar to SPG seals, but they have an open end that allows for the grease to be replenished. This is useful for applications where the seal is subjected to extreme operating conditions.

SPG and SPGO seals are used in a variety of construction machinery applications, including:

• Excavators
• Bulldozers
• Backhoes
• Wheel loaders
• Skid steer loaders
• Cranes
• Concrete mixers
• Asphalt pavers

SPG and SPGO seals offer the following benefits:

• Excellent sealing performance
• Resistant to wear and tear
• Suitable for use in a wide range of hydraulic applications
• Long service life
• Can withstand high pressures, temperatures, and speeds
• SPGO seals offer the additional benefit of grease replenishment

SPG and SPGO hydraulic seals are a reliable and cost-effective way to protect hydraulic systems in construction machinery from leaks and contamination. They are especially well-suited for applications where the seal is subjected to harsh operating conditions.