CAT 625-3323 150mm Inner Diameter Split Sleeve Bearing

CAT 625-3323 is a Caterpillar 150mm inner diameter split sleeve bearing (split sliding bearing), specifically designed for large-diameter shaft systems in heavy equipment. It is suitable for slewing bearings, drive shafts, or gearbox input shafts in excavators, loaders, etc. The following is structured technical and application information.

Core Technical Parameters

Item Details
Basic Attributes Model 625-3323, type is split bimetallic sleeve bearing, material is steel back + copper-lead alloy (CuPb10Sn10), inner surface self-lubricating layer thickness 0.05 mm, single weight approximately 5.8 kg, operating temperature -30℃ to +120℃, lubrication method is forced oil lubrication (ISO VG 68 anti-wear hydraulic oil), fit tolerance: inner diameter H7, outer diameter r6, surface roughness Ra≤0.4 μm

Key Dimensions Inner diameter 150 mm, outer diameter 170 mm, total length 120 mm, split surface clearance 0.5 mm, wall thickness 10 mm, bolt hole diameter 12 mm, bolt hole center distance 150 mm, locating pin diameter 8 mm, chamfer 2×45°, compatible shaft diameter 150 mm, radial clearance 0.15-0.20 mm

Compatible Models and Locations Compatible For Cat 336D2 and 349D2 excavators, 980M loaders, 777G mining trucks, etc., these bearings are installed on the input shaft of the slewing gearbox, the main reducer shaft of the drive axle, and the drive shaft of the hydraulic pump, etc., with 2 pieces (upper and lower halves) per shaft. They are used to bear radial heavy loads and compensate for installation errors.

Performance Parameters: Radial rated static load ≥1800 kN, maximum permissible linear velocity ≤1.5 m/s, coefficient of friction ≤0.05 (oil film lubrication), fatigue life ≥10000 hours, tightening torque 80-90 N・m, impact load resistance 150 kN

Structural and Performance Advantages:
Split design: The upper and lower half-bearing structure facilitates on-site installation and replacement without disassembling the entire shaft, adapting to the maintenance needs of large-diameter shaft systems and significantly reducing downtime.

Bimetallic material: The steel back provides high-strength support, the copper-lead alloy layer has excellent wear resistance and embedding properties, can accommodate small impurities, protects the journals and reduces wear, and the self-lubricating layer provides temporary lubrication under low-oil conditions. Forced Lubrication Channels: The bearing housing has pre-drilled oil holes and grooves to accommodate forced lubrication systems, ensuring stable oil film under high speed or heavy loads and reducing friction loss and temperature rise.

Clearance Compensation Function: The split surface and radial clearance design compensates for shaft thermal expansion and installation coaxiality errors, preventing shaft seizure and improving operational stability.

Installation and Maintenance Points:
Installation Procedure: Clean the bearing housing and journal, checking for burrs and rust; install the lower bearing half into the bearing housing and position it, applying assembly lubricant; install the upper bearing half, insert the locating pins and tighten the bolts (tightening symmetrically at a torque of 80-90 N·m); install the grease fitting, connect the lubrication lines, and inject oil and purge air before trial operation to ensure oil film formation.

Maintenance Cycle: Check oil level and pressure every 500 hours to ensure normal lubrication system operation; check bearing temperature and vibration every 1500 hours; if temperature is abnormal (>80℃), stop the machine for repair; disassemble and inspect bearing wear every 3000 hours; replace bearings when inner diameter wear exceeds 0.3 mm.

Common Faults and Solutions: Excessive oil temperature is often due to insufficient lubrication flow, requiring cleaning of the oil passages or increasing the oil supply; abnormal noise is often due to excessive clearance between the journal and bearing, requiring bearing replacement or clearance adjustment; bearing seizure is often due to oil film rupture, requiring inspection of the lubrication system and replacement of the damaged bearing.