CAT 107-7894 BUSHING

CAT 107-7894 is a Caterpillar straight-tube steel bushing, commonly used in articulated parts such as booms, sticks, and connecting rods. Its core function is to bear radial loads, reduce pin wear, and improve the durability of articulated parts. It is compatible with various machine types such as excavators and loaders and is a key basic component of the articulated system of construction machinery. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 107-7894, Type: Straight cylindrical flangeless bushing (no oil groove/oil hole), Material: Powder metallurgy alloy steel (oil-containing self-lubricating, porosity 15%-20%), Single weight: Approximately 0.8 kg, Suitable temperature: -30℃ to +150℃, Lubrication method: Pre-lubrication + replenishing grease lubrication (compatible with Cat Moly-Dee No. 2 lithium-based grease), Surface treatment: Manganese phosphate (salt spray resistance ≥360 h)

Key Dimensions
Inner diameter: 50 mm (tolerance H7, 50.00-50.03 mm), Outer diameter: 70 mm (tolerance h6, 69.97-70.00 mm), Length: 60 mm (tolerance ±0.1 mm), Chamfered ends: 1×45°, Wall thickness: 10 mm, No oil groove/oil hole, Suitable pin diameter: 50 mm (tolerance…) (f7) Compatible Models and Parts: Compatible with Cat 320D/323D excavator boom – stick hinge shaft, 950GC loader bucket linkage pin shaft, D6K bulldozer balance beam pin shaft. One piece per hinge point, used to bear radial load (maximum radial load 120 kN), reducing wear between pin and support, and extending the life of the hinge part.

Performance Parameters: Maximum radial load 120 kN, allowable speed 50 rpm, coefficient of friction ≤0.08 (grease lubrication conditions), fatigue life ≥5000 h (under rated load), fitting clearance between the pin and bushing 0.04-0.06 mm.

Structural and Performance Advantages: High load-bearing capacity: Made of powder metallurgy alloy steel, with a dense structure, capable of withstanding large radial loads, suitable for the stress requirements of hinge parts under high-intensity operating conditions of construction machinery.

Self-lubricating and friction-reducing: The material contains oil, enabling pre-lubrication. Combined with regular grease lubrication, it has a low coefficient of friction, reducing relative wear between the pin and bushing, and lowering maintenance frequency.

Wear and corrosion resistant: Manganese phosphate surface treatment enhances surface hardness and corrosion resistance, making it suitable for harsh outdoor conditions such as humidity and dust, extending service life.

Easy installation: The straight-cylinder structure requires no complex installation. Cold pressing (pressure 8-10 MPa) ensures reliable positioning, high installation efficiency, and reduces the risk of assembly errors.

Installation and maintenance points: Before installation, clean the pin, bushing, and support mounting holes. Inspect the bushing surface for cracks and dents. Press the bushing into the support hole using the cold pressing method, ensuring the bushing end face is flush with the support hole end face. After installation, the clearance should be 0.04-0.06 mm.

Maintenance every 1000 hours: Check the hinge joints for looseness or abnormal noise. Regularly apply Cat Moly-Dee No. 2 lithium-based grease (5-10 g per point each time). If the bushing inner diameter wear exceeds 0.1 mm or if deformation or cracks appear, replace it immediately.

Prioritize genuine parts. Aftermarket parts may have issues such as substandard material porosity or insufficient dimensional accuracy, easily leading to premature wear of the pins and bushings, causing loosening and abnormal noise at the hinge joints, affecting the normal operation of the equipment.