English ![]()
+86-17692703999
+86-17692703999 No. 6, West Side Auxiliary Road,
Sunshine Street, Linxi County, Xingtai
City, Hebei Province
Sunshine Street, Linxi County, Xingtai
City, Hebei Province
 |
| Quantity: | |
|---|---|
129-7770
The 129-7770 Excavator Sleeve Bearings and Bushings are premium OEM replacement parts designed exclusively for Caterpillar excavators, including models like the CAT 328D LCR, CAT 320B LU, CAT 320B N, CAT 320B L, and CAT 320B LL. As a direct OEM replacement for the 129-7770 part number, these components adhere to strict dimensional standards—with a tolerance of ±0.02mm—and comply with the H7/g6 fit standard to ensure seamless integration with Caterpillar’s original hinge structures. Crafted from high-grade materials (45#/40Cr/42CrMo) and treated with corrosion-resistant finishes (Dacromet or hard chrome), they deliver exceptional wear resistance and durability, even in harsh conditions like mining, coastal ports, or dusty construction sites. The bushings feature a "hard exterior, tough core" design: a surface hardness of HRC 58-62 (for wear resistance) and a core hardness of HRC 30-35 (for impact absorption), making them ideal for heavy alternating loads in Caterpillar excavator operations.
Made from carburizing steel (20CrMnTi or 20CrMo) with a carbon content of 0.1%-0.25%, these bushings undergo carburizing quenching and low-temperature tempering. This process creates a 0.8-1.2mm hardened surface (HRC 58-62) to resist wear, while the tough core absorbs impact—critical for dynamic excavator tasks like digging and lifting.
Using CNC turning and grinding technology, the 129-7770 bushings achieve a tolerance of ±0.02mm, meeting the H7/g6 fit standard. This precision eliminates loose installation, abnormal vibration, or premature wear, ensuring smooth coordination with excavator pins and ear plates.
Two advanced surface treatments are available to suit diverse environments:
Dacromet Coating: Composed of zinc, aluminum flakes, and chromate salts, it withstands salt spray tests for over 1000 hours, has no hydrogen embrittlement risk, and is perfect for coastal or high-humidity ports.
Hard Chrome Plating: A 0.02-0.05mm thick layer that combines corrosion resistance with reduced friction, ideal for dry, dusty construction sites.
A 0.8-1.2mm hardened layer (via high-frequency quenching or carburizing) minimizes direct metal-to-metal contact wear. For extreme conditions, optional Laser Surface Texture (LST) technology optimizes lubrication flow with micro-pits, improving performance under boundary lubrication.
Engineered specifically for Caterpillar excavators like the 328D LCR and 320B series, the 129-7770 bushings require no modifications. They fit directly into the original equipment’s hinge points, reducing maintenance time and costs.
Installed in key hinge points of Caterpillar excavators, such as the boom-body connection, arm-bucket joint, and cylinder attachment points. These areas require reliable performance to ensure safe, efficient operation.
Ideal for coal, ore, or gravel mining, where excavators handle abrasive materials. The 20CrMnTi carburizing steel and hardened surface resist wear from sharp, dense debris, extending the bushing’s service life.
Suitable for building construction, road construction, and bridge projects. The H7/g6 fit standard ensures stable operation even under dynamic loads (e.g., digging through hard soil or lifting heavy steel).
The Dacromet-coated 129-7770 bushings excel in port operations, where high humidity and salt spray corrode standard components. Their 1000+ hour salt spray resistance prevents rust and premature failure.
Used in municipal tasks like sewage treatment, road maintenance, and waste handling. The bushings’ durability and corrosion resistance stand up to varied, harsh urban conditions.
The 129-7770 Excavator Sleeve Bearings and Bushings are premium OEM replacement parts designed exclusively for Caterpillar excavators, including models like the CAT 328D LCR, CAT 320B LU, CAT 320B N, CAT 320B L, and CAT 320B LL. As a direct OEM replacement for the 129-7770 part number, these components adhere to strict dimensional standards—with a tolerance of ±0.02mm—and comply with the H7/g6 fit standard to ensure seamless integration with Caterpillar’s original hinge structures. Crafted from high-grade materials (45#/40Cr/42CrMo) and treated with corrosion-resistant finishes (Dacromet or hard chrome), they deliver exceptional wear resistance and durability, even in harsh conditions like mining, coastal ports, or dusty construction sites. The bushings feature a "hard exterior, tough core" design: a surface hardness of HRC 58-62 (for wear resistance) and a core hardness of HRC 30-35 (for impact absorption), making them ideal for heavy alternating loads in Caterpillar excavator operations.
Made from carburizing steel (20CrMnTi or 20CrMo) with a carbon content of 0.1%-0.25%, these bushings undergo carburizing quenching and low-temperature tempering. This process creates a 0.8-1.2mm hardened surface (HRC 58-62) to resist wear, while the tough core absorbs impact—critical for dynamic excavator tasks like digging and lifting.
Using CNC turning and grinding technology, the 129-7770 bushings achieve a tolerance of ±0.02mm, meeting the H7/g6 fit standard. This precision eliminates loose installation, abnormal vibration, or premature wear, ensuring smooth coordination with excavator pins and ear plates.
Two advanced surface treatments are available to suit diverse environments:
Dacromet Coating: Composed of zinc, aluminum flakes, and chromate salts, it withstands salt spray tests for over 1000 hours, has no hydrogen embrittlement risk, and is perfect for coastal or high-humidity ports.
Hard Chrome Plating: A 0.02-0.05mm thick layer that combines corrosion resistance with reduced friction, ideal for dry, dusty construction sites.
A 0.8-1.2mm hardened layer (via high-frequency quenching or carburizing) minimizes direct metal-to-metal contact wear. For extreme conditions, optional Laser Surface Texture (LST) technology optimizes lubrication flow with micro-pits, improving performance under boundary lubrication.
Engineered specifically for Caterpillar excavators like the 328D LCR and 320B series, the 129-7770 bushings require no modifications. They fit directly into the original equipment’s hinge points, reducing maintenance time and costs.
Installed in key hinge points of Caterpillar excavators, such as the boom-body connection, arm-bucket joint, and cylinder attachment points. These areas require reliable performance to ensure safe, efficient operation.
Ideal for coal, ore, or gravel mining, where excavators handle abrasive materials. The 20CrMnTi carburizing steel and hardened surface resist wear from sharp, dense debris, extending the bushing’s service life.
Suitable for building construction, road construction, and bridge projects. The H7/g6 fit standard ensures stable operation even under dynamic loads (e.g., digging through hard soil or lifting heavy steel).
The Dacromet-coated 129-7770 bushings excel in port operations, where high humidity and salt spray corrode standard components. Their 1000+ hour salt spray resistance prevents rust and premature failure.
Used in municipal tasks like sewage treatment, road maintenance, and waste handling. The bushings’ durability and corrosion resistance stand up to varied, harsh urban conditions.
