CAT 320-7364 BUSHING

CAT 320-7364 is a Caterpillar genuine straight-tube sliding bushing (oil hole type), suitable for articulated/pivot joints in engineering machinery. The following is structured raw data, excluding replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 320-7364, type is straight cylindrical sliding bushing (shaft sleeve), material is high-strength brass (CuZn25Al5), oil-lubricated structure, single weight 0.42 kg, working temperature -30℃ to +120℃, suitable for shaft diameter φ50 mm, used for boom and stick hinge points of Cat 320/320L/320B/320C excavators, bearing radial load ≤80 kN, suitable for swing frequency ≤6 times/minute

Key Dimensions
Inner diameter 50.0 mm (1.969 in), outer diameter 60.0 mm (2.362 in), length 50.0 mm (1.969 in), oil hole diameter φ3.5 mm (0.138 in), number of oil holes 2 (symmetrically distributed), inner diameter tolerance +0.025/-0.010 mm, outer diameter tolerance + 0.012/-0.005 mm, length tolerance ±0.12 mm, inner hole roughness Ra≤1.6 μm, outer diameter cylindricity≤0.015 mm
Compatible Models and Locations: Compatible with Cat 320/320L/320B/320C excavators and 933C loaders. Installed at the boom and stick hinge point and bucket linkage pivot, one piece per location. Uses a pressure lubrication system to reduce friction and wear at the hinge points.
Performance Parameters: Coefficient of friction μ≤0.10 (boundary lubrication), compressive strength ≥580 MPa, yield strength ≥280 MPa, wear rate ≤0.04 mm/1000 hours, lubrication method is pressure lubrication (oil hole supply, pressure 0.2-0.4 MPa), suitable shaft speed ≤80 r/min Structural and Performance Advantages
High-Strength Brass Material: Possesses excellent friction reduction and wear resistance, suitable for heavy-load, low-speed oscillating conditions, preventing shaft and bushing seizure.

Dual Oil Hole Design: Symmetrically distributed φ3.5 mm oil holes ensure uniform lubrication, reduce frictional heat at hinged joints, and extend service life.

Precision Dimension Control: Strict tolerances for inner and outer diameters ensure precise matching with shaft diameter and seat bore, preventing excessive clearance that could cause impact and vibration.

Self-Lubricating Properties: The material contains oil components, maintaining lubrication even under short-term oil shortage conditions, improving equipment operational reliability.

Installation and Maintenance Points (Original Data)

Installation Procedure: Clean the journal and seat bore, press in the bushing (pressing force ≤35 kN, avoid uneven loading), ensure the oil holes and lubrication lines are aligned, check the radial clearance after installation (0.06-0.10 mm), test for no jamming during oscillation, and tighten the seat bore bolts to the specified torque (55-65 N・m). Maintenance Cycle: Check bushing wear and lubrication every 1200 hours. Clean clogged oil holes. Replace the bushing when radial clearance exceeds 0.20 mm. Also check journal wear at the same time.

Common Troubleshooting: Excessive clearance due to bushing wear requires replacement; overheating due to poor lubrication requires checking the oil passages and cleaning oil holes; surface scoring requires journal repair or bushing replacement.