CAT 522-8214 Bushing (SEM)

CAT 522-8214 is a hinge pin/boom bushing for Caterpillar SEM (Shandong Engineering Machinery) loaders/graders. It is compatible with SEM 652D/656D/658D loaders, 919/921 graders, etc., and is used at the hinge joints between the chassis and the boom, rocker arm, etc., providing wear resistance, cushioning, and positioning. It weighs approximately 0.98 kg. The following is professional structured information:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes
Model 522-8214 (SEM Dedicated Bushing), Flangeless Cylindrical Bushing, Inner Diameter φ45 mm, Outer Diameter φ65 mm, Total Length 80 mm (Tolerance ±0.1 mm), Material: ZCuSn10Pb1 Tin Bronze (Cu≥88%, Sn 9-11%, Pb 0.5-1.5%), Hardness HB 90-110, uncoated surface, operating temperature -25℃ to +100℃, rated radial load 120 kN, coefficient of friction ≤0.08
Key Dimensions: Clearance fit between inner hole and pin (0.04-0.06 mm), interference fit between outer diameter and mounting base (0.10-0.12 mm), chamfered ends 1×45°, inner hole surface turned (Ra≤3.2 μm), outer diameter precision ground (Ra≤1.6 μm), no oil groove (suitable for pins with oil passages)
Material and Process: ZCuSn10Pb1 tin bronze centrifugal casting, inner hole honing, outer diameter precision ground, dimensional accuracy GB/T 1176-2013, density 8.8 g/cm³, coefficient of thermal expansion 18×10⁻⁶/℃, compressive strength ≥220 MPa, elongation ≥8%, corrosion resistance IP65
Compatible Models: Compatible with Shantui SEM This bushing is compatible with the boom-frame hinge point and rocker arm-link connecting pin of 652D/656D/658D wheel loaders, SEM 919/921 graders, and SEM 822/824 bulldozers. It is also compatible with the front working device bushing of CAT 906M/907M mini loaders.

Assembly fit: Clearance between the bushing and pin: 0.04-0.06 mm; Interference fit with mounting seat: 0.10-0.12 mm; Pressing force: 8-10 kN (using a dedicated pressing tool); Flatness of the rear end face after pressing: ≤0.05 mm; Regular lubrication with lithium-based grease (NLGI 2) is required during operation.

Installation and maintenance points: Before installation, check the inner and outer circles of the bushing for scratches and air holes. Clean the mounting seat hole and pin. Cool the bushing with liquid nitrogen (-196℃, 5-10 minutes). Use a heating pad (80-100℃) to assist with pressing, avoiding damage to the bushing from forceful hammering.

During pressing, use a coaxial guide tool to ensure the bushing end face is flush with the mounting base. After pressing, check the inner hole roundness to be ≤0.03 mm, with no elliptical deformation.

Maintenance cycle: Check bushing wear every 1500 hours (replace if clearance >0.2 mm), replenish grease every 2000 hours. Before each shift of loader operation, check the hinge joints for abnormal noises and looseness; replace the bushing immediately if any abnormalities are found.