CAT 077-4599 BEARING

CAT 077-4599 is a Caterpillar genuine steel-backed bronze sleeve bearing, suitable for the pin positions of loaders, excavators, and other equipment. The following is raw data and does not include information on replacement parts (Cat® Parts).

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 077-4599, Type: Straight Sleeve Sleeve Bearing, Material: Steel Back + Bronze Alloy (CuSn8P), Single Weight: 0.45 kg, Applicable Working Conditions: Heavy Load, Low-Speed ​​Oscillation, Working Temperature: -20℃ to +140℃, Protection Rating: IP65, Rated Bearing Pressure ≥220 MPa, Friction Coefficient ≤0.09 (Oil Lubrication), No Internal/External Grooves or Crossed Oil Holes, Suitable for Cat 950H/962H Loaders, 336D Excavator Boom Pins, Stick Cylinder Pins, etc.

Key Dimensions (Metric/Imperial)
Inner Diameter: 44.45 mm (1.75 in, Tolerance +0.02/-0 mm), Outer Diameter: 50.80 mm (2.00 in, Tolerance +0.03/-0 mm), Length: 50.80 mm (2.00 in, Tolerance +0.03/-0 mm) ±0.1 mm), wall thickness 3.175 mm (0.125 in, tolerance ±0.02 mm), end face perpendicularity ≤0.02 mm, inner hole roughness Ra≤0.8 μm

Performance Parameters: Fatigue life ≥10⁶ cycles (180 MPa load), wear resistance ≥4000 hours (oil lubrication condition), steel backing hardness HB 170-210, bronze layer hardness HB 75-95, compatible shaft diameter φ44.45-44.48 mm, installation interference 0.02-0.04 mm

Structural and Performance Advantages:

Composite Material Structure: The steel backing provides high-strength support, while the bronze alloy layer possesses excellent wear resistance and self-lubricating properties, suitable for low-speed, heavy-load, and frequent oscillation conditions, reducing pin wear.

Precise Dimensional Fit: Grooveless design, compatible with pins and mounting holes of specific diameters, interference fit ensures no loosening after installation, guaranteeing equipment operational stability.

Highly adaptable: Compatible with key components such as the boom and stick of Cat 950H/962H loaders and 336D excavators, precisely matching original pins and mounting holes without additional machining.

Installation and Maintenance Points (Original Data)

Installation: Clean the mounting holes and pin surfaces (free from oil, burrs, and rust). Install using cold pressing or hot mounting (hot mounting temperature ≤110℃). After installation, the bearing end face should be flush with the mounting surface, without misalignment. The pin should rotate freely without jamming, and the clearance between the bearing and the mounting hole should be ≤0.01 mm.

Maintenance: Check lubrication every 400 hours to ensure sufficient grease between the pin and bearing (Cat HD EP 2 grease recommended). Regularly check bearing wear; replace when inner diameter wear exceeds 0.12 mm. For long-term storage, apply rust-preventive oil and seal to prevent moisture.

Troubleshooting: Common faults include bearing wear and pin jamming, which are often caused by insufficient lubrication, improper installation interference, or harsh operating conditions. It is necessary to replace the bearing and check the wear of the pin to ensure installation accuracy and adequate lubrication.