CAT 6A-7897 BUSHING

CAT 6A-7897 is a Caterpillar genuine straight steel-backed self-lubricating bushing, suitable for articulated and damping parts of equipment such as road rollers and loaders. The following are precise original part information:

Core Technical Parameters

Item Details
Part Model: CAT 6A-7897 (6A7897) Straight Flangeless Bushing, weight approximately 0.05 kg (0.11 lb), suitable for low-speed oscillation and light radial load conditions

Core Materials: Steel backing + bronze matrix + PTFE self-lubricating layer. The steel backing is low-carbon steel, the bronze layer is CuSn10Pb10, the PTFE layer thickness is 0.2-0.3 mm, the coefficient of friction μ≤0.08, suitable for oilless lubrication

Key Dimensions: Inner diameter 25 mm (0.984 in), outer diameter 30 mm (1.181 in), width 20 mm (0.787 in), inner diameter tolerance H7, outer diameter and mounting hole fit tolerance J7, compatible with shaft diameter 25 mm (tolerance h6)

Structural Features: Straight cylinder without oil grooves/holes; PTFE self-lubricating layer suitable for low-speed oscillation ≤5 rpm; steel backing with mounting hole interference fit ensures stable installation; suitable for hinge points with limited radial space.

Compatible Machines: CAT 825G road roller (steering link hinge point), 938G loader (boom and rocker arm hinge), 3054C engine (shock absorber mounting bushing), etc.

Accessories: Compatible pin 8T-4127, elastic retaining ring 586-7419, dust seal 436-7781

Core Functions and Structural Features:
Self-lubricating adaptation: The PTFE layer achieves oil-free or low-oil lubrication, suitable for high-frequency oscillation and difficult-to-maintain hinge parts of construction machinery, reducing friction and wear, and reducing maintenance frequency.

Light-load Stable Bearing: The steel backing and bronze substrate structure can withstand light radial loads (static load approximately 80 kN), suitable for light-load oscillating conditions such as steering linkages and shock absorbers, ensuring stable component operation.

Compact Installation Adaptability: The straight-tube, flangeless design, only 20 mm wide, is suitable for compact installation spaces. Axial position is fixed by a retaining ring, adaptable to multi-hinge layouts.

Corrosion Resistant and Durable: The PTFE layer and bronze substrate are corrosion resistant, suitable for dusty and humid outdoor conditions, extending bushing lifespan.

Installation and Maintenance Points
Installation Specifications: Clean the mounting hole and pin, removing burrs and oil stains. Inspect the bushing for cracks and deformation. The mounting hole and bushing outer diameter should have an interference fit (J7). Cold press into place, ensuring the end face aligns with the mounting hole step.

The pin surface roughness Ra≤0.8 μm, hardness≥HRC 50. After installation, the clearance between the pin and the bushing inner hole should be 0.04-0.08 mm to ensure flexible oscillation.

After installation and trial operation, there was no jamming or abnormal noise. The hinged parts oscillated smoothly with no axial movement.

Maintenance Recommendations: Check the oscillation flexibility every 800 working hours. If jamming or increased clearance occurs, promptly check the bushing wear.

Regularly clean surrounding debris to prevent foreign objects from damaging the PTFE layer and affecting its self-lubricating effect.