Description
CAT 242-7073 BUSH
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CAT 242-7073 is a Caterpillar original straight-tube steel bushing, suitable for heavy-duty articulated parts such as booms and sticks. The following is purely precise information (no additional description):
Core Parameters and Information
Item Details
Part Model: CAT 242-7073 (2427073) Straight-tube Steel Bushing
Part Type: Radial sliding bushing, semi-finished inner bore, reamed bore after installation to fit the pin, withstands radial static load ≤70kN, dynamic load ≤40kN
Material: 40Cr alloy steel, surface hardened + nitrided, hardness HRC56-60, wear-resistant layer thickness 0.25-0.4mm
Key Dimensions: Inner diameter 44.45mm (1.750in), outer diameter 57.15mm (2.250in), length 63.50mm (2.500in), wall thickness 6.35mm, chamfered ends 1.5×45°
Structural Features: Cylindrical, oil-groove-free, semi-finished inner hole (tolerance H8), reamed to H7 after installation for the matching pin, interference fit 0.012-0.022mm
Compatible Structure: Matching pin diameter 44.45mm (tolerance h7), mounting hole diameter 57.15mm (tolerance H7), hole surface roughness Ra≤0.8μm
Applicable Working Conditions: Excavator, loader boom/stick articulation, working pressure 0-22MPa, swing angle ≤±12°, speed ≤80rpm
Compatible Models and Assemblies:
Excavators: CAT 312D, 315D, 320D (boom cylinder upper hinge point bushing assembly)
Loaders: CAT 938H, 950H (boom hinge bushing assembly)
Compatible Assemblies: 312D boom cylinder upper hinge point bushing assembly, 938H Boom Hinge Bushing Assembly Installation and Fitting Points: Before installation, clean the mounting holes and bushing. Use a cold-pressing method for installation; hot fitting 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 44.45mm (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-bushing fit clearance of 0.01-0.02mm, ensuring smooth swing without abnormal noise.
For disassembly, use a special puller to remove the bushing. When replacing, check for wear in the mounting hole. If wear >0.05mm, repair or replace the mounting seat.
