CAT 320-8563 BUSHING

CAT 320-8563 is a Caterpillar genuine steel wear-resistant bushing, suitable for boom, stick, or bucket pin hinge joints. The following is purely precise information (no additional description): Cat®…

Core Parameters and Information

Item Details
Part Model: CAT 320-8563 (3208563) Steel Wear-Resistant Bushing

Part Type: Seamless cylindrical bushing, suitable for pin hinge joints, bearing radial loads, used in low-to-medium speed, heavy-duty, and oscillating conditions

Material: Base material: Medium carbon alloy steel (SAE 1045), surface: hardened + nitrided, hardness HRC58-62, nitriding depth 0.3-0.5mm, inner hole surface roughness Ra≤0.8μm

Key Dimensions: Inner diameter 50.80mm, outer diameter 63.50mm, total length 76.20mm, wall thickness 6.35mm, chamfered ends 1.5×45°

Structural Features Available in two sizes: with and without oil grooves. Compatible with 50.80mm diameter pins. Installation interference fit: 0.020-0.035mm. Operating temperature: -40℃ to +120℃.

Compatible Structure: Pin fit tolerance h7, bushing seat bore fit tolerance H7. Rated radial load: 85kN. Fatigue life: ≥5000 working hours.

Lubrication Requirements: Grease lubrication. CAT 4V-9668 lithium-based grease is recommended. Top up every 500 working hours, 0.5-1.0g each time.

Compatible Machines and Assemblies:

Excavators: CAT 320D2, 323F, 326GC (boom lower hinge point, stick upper hinge point, bucket pin bushing)

Loaders: CAT 930M, 938M (bucket connecting rod, rocker arm pin bushing)

Compatible Assembly: 320D2 Boom lower hinge point bushing assembly, 930M bucket connecting rod bushing assembly

Matching parts: 320-8563 bushing, 8T-4125 shaft retaining ring, 161-8220 sealing ring, 5P-1949 bushing end cap

Installation and Fitting Points

Before installation, clean the pin, bushing seat hole, and bushing to remove iron filings and oil stains; use cold pressing installation, pressure ≤30kN, and do not strike the bushing end face to avoid deformation.

Pin fit tolerance h7, bushing seat hole fit tolerance H7. After installation, the bushing end face should fit snugly against the seat hole without gaps, the pin should rotate without jamming, and the radial clearance should be 0.015-0.025mm.

After installation, inject the specified type of grease and check for leaks before installing on the machine.

Use a special puller for disassembly to avoid damaging the seat hole or pin. When replacing, check the pin wear to be ≤0.05mm; if it exceeds the tolerance, replace the pin simultaneously.