Description
CAT 523-1239 BUSHING-SEM
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CAT 523-1239 is a Caterpillar original semi-finished (SEM) steel bushing, suitable for heavy-duty articulated parts such as booms and sticks, used for wear resistance and positioning between pins and mounting holes. The following is purely precise information (no additional description): Cat®…
Core Parameters and Information
Item Details
Part Model: CAT 523-1239 (5231239) Semi-finished Bushing (SEM BUSHING)
Part Type: Radial sliding bushing, semi-finished inner hole, reamed hole after installation to fit pins, withstands radial static load ≤80kN, dynamic load ≤45kN
Material: 42CrMo alloy steel, surface hardened + nitrided, hardness HRC58-62, wear layer thickness 0.3-0.5mm
Key Dimensions: Inner diameter 50.80mm (2.000in), outer diameter 63.50mm (2.500in), length… 76.20mm (3.000in), wall thickness 6.35mm, chamfered ends 1.5×45°
Structural Features: Cylindrical, oil-free, semi-finished inner hole (tolerance H8), reamed to H7 after installation for the matching pin, interference fit 0.015-0.025mm
Compatible Structure: Matching pin diameter 50.80mm (tolerance h7), mounting hole diameter 63.50mm (tolerance H7), hole surface roughness Ra≤0.8μm
Applicable Working Conditions: Excavator, loader boom/stick articulated, working pressure 0-25MPa, swing angle ≤±15°, speed ≤100rpm
Compatible Models and Assemblies:
Excavator: CAT 320D, 323D, 336D (boom cylinder lower hinge point bushing assembly)
Loader: CAT 950H, 962H, 972H (Stick Hinge Bushing Assembly)
Compatible Assemblies: 320D Boom Cylinder Lower Hinge Point Bushing Assembly, 950H Stick Hinge Bushing Assembly
Installation and Fitting Points
Clean the mounting holes and bushings before installation. Use cold pressing to press them in; hot pressing is prohibited to prevent deformation. After pressing, the bushing end face should be flush with the mounting hole end face, with an axial deviation ≤0.03mm.
After pressing, ream the hole to 50.80mm (H7). The surface roughness after reaming should be Ra≤0.4μm, with no scratches and an ellipticity ≤0.015mm.
After assembly, check for radial runout ≤0.04mm, and a pin-buckle fit clearance of 0.01-0.02mm, ensuring smooth movement without abnormal noise.
For disassembly, use a special puller to remove the bushing. When replacing, check for wear in the mounting hole. If the wear >0.05mm, repair or replace the mounting seat.
