CAT 522-5208 BEARING-SLV-GD

CAT 522-5208 YM is a Caterpillar original pivot pin assembly, adapted for excavator bucket linkage/stick hinge points. The following is purely precise information (no additional description):

Core Parameters and Information

Item Details
Part Model: CAT 522-5208 YM (5225208) Pivot Pin Assembly (including pin body, dust seal, and retaining ring)

Part Type: Heavy-duty pivot pin, used in hinged areas, bearing radial loads + impact loads, suitable for low-to-medium speed oscillating conditions

Material: Pin body: SAE 4340 alloy structural steel, quenched + tempered, hardness HRC38-42; surface carburizing depth 0.8-1.2mm, carburized layer hardness HRC58-62

Key Dimensions: Pin outer diameter 45.00mm, total length 180.00mm, mating section length 120.00mm, chamfered ends 2.0×45°, thread specification M16×1.5

Structural Features: Pin body with lubrication channel, elastic retaining rings (8T-4125) at both ends, dustproof ring (161-8220) to prevent mud and sand intrusion, compatible with 45.00mm inner diameter bushings.

Compatible Structure: Shaft hole fit tolerance H7, bushing clearance 0.010-0.025mm, operating temperature -40℃ to +120℃, rated load 180kN.

Lubrication Requirements: Grease lubrication, recommended CAT 4V-9668 lithium-based grease, apply grease every 500 working hours, filling the cavity to 1/3-1/2 full.

Compatible Models and Assemblies:

Excavators: CAT 320GC, 323GC, 326GC (bucket connecting rod and stick hinge)

Compatible Assemblies: Bucket connecting rod hinge assembly

Matching Parts: 522-5208 YM pin body, 8T-4125 Elastic retaining ring, 161-8220 dustproof ring, 320-8563 bushing: Installation and Fitting Points

Clean the pin body and bushing hole before installation, ensuring no iron filings or oil contamination. Cold press installation is required; pressure ≤25kN. Do not strike the pin body end face to avoid deformation.

The gap between the pin body and bushing should be 0.010-0.025mm. After installation, the retaining ring should fit snugly into the groove, and the dustproof ring should fit snugly against the pin body without leakage.

After installation, inject the specified grease and check for any jamming in the hinge joint, ensuring the gap meets requirements.

Use a dedicated puller for disassembly to avoid damaging the pin body/bushing. When replacing, check that the inner diameter wear of the bushing is ≤0.05mm; if it exceeds this tolerance, replace the bushing simultaneously.