CAT 572-0340 70mm Inner Diameter Swing Drive Bearing

The CAT 572-0340 is a Caterpillar genuine single-row tapered roller slewing drive bearing with an inner diameter of 70 mm. It is suitable for the slewing mechanism of small excavators and can withstand heavy radial and bidirectional axial loads. The following is structured raw data and does not include replacement parts information (Cat® Parts).

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes Model 572-0340, type is single-row tapered roller bearing (including inner ring, outer ring, rollers, stamped steel cage), material is SAE 52100/GCr15 high carbon chromium bearing steel, quenched and tempered (HRC 60-64), single weight 1.8 kg, operating temperature -40℃ to +120℃, lubrication method is grease lubrication (recommended Cat 1U-8886), suitable for low-speed, heavy-load, continuous rotation Cat® Parts

Key Dimensions Inner diameter 70 mm (2.756 in), outer diameter 120 mm (4.724 in), width 35 mm (1.378 in), cone angle 12°, roller diameter 12 mm, number of rollers 18, inner ring large end diameter 95 mm, outer ring small end diameter 85 mm, radial clearance 0.020-0.040 mm, 2×45° chamfer at both ends, shaft diameter fit tolerance h6, bearing housing bore tolerance H7
Compatible Models and Parts: Compatible with Cat 305.5, 306, 307 excavators, slewing bearing lower support/drive gear shaft, 1 piece per unit, bearing axial load of the superstructure + radial load of the working device, suitable for speeds ≤1500 r/min (Cat® Parts)
Performance Parameters: Radial rated dynamic load ≥95 kN, radial rated static load ≥120 kN, axial rated dynamic load ≥40 kN, axial rated static load ≥80 kN, maximum linear velocity ≤6 m/s, fatigue life ≥10000 hours, coefficient of friction ≤0.0025 (grease lubrication)
Structural and Performance Advantages: Tapered roller structure: can simultaneously bear radial + bidirectional axial loads, the tapered contact design ensures uniform load distribution and reduces contact stress, suitable for frequent start-stop and variable load conditions of slewing mechanisms (Cat® Parts) Cat® Parts.

High-strength material: SAE 52100 steel, vacuum hardened, possesses high hardness and wear resistance, offering 30% greater impact resistance than ordinary bearings, suitable for the harsh operating conditions of engineering machinery.

Stamped steel cage: High rigidity, excellent heat dissipation, precise roller positioning, preventing uneven loading, suitable for continuous rotation and impact loads, extending bearing life.

Original factory precise fit: Dimensional tolerances controlled within ±0.01 mm, ensuring precise fit with rotary drive gear shafts and bearing housings, reducing vibration and noise, and improving rotational smoothness. Installation and Maintenance Points (Original Data)

Installation Procedure: Clean the shaft diameter (surface hardness ≥ HRC 58, roughness Ra ≤ 0.8 μm) and bearing housing. Heat the inner ring to 80-100℃ and heat-fit (interference 0.015-0.025 mm). Cold-press the outer ring into the bearing housing (interference 0.010-0.020 mm). After installation, check the radial clearance and end face runout (≤ 0.02 mm). Pre-tighten according to the manual (pre-tightening torque 15-20 N・m).

Maintenance Cycle: Check grease every 500 hours, replenish every 2000 hours, disassemble and inspect every 8000 hours. Replace when radial clearance > 0.1 mm or raceway/roller damage occurs.

Common troubleshooting: Overheating is often caused by insufficient lubrication or excessive preload, requiring grease replenishment or preload adjustment; abnormal noise is often caused by worn rollers or foreign objects, requiring replacement and cleaning; excessive vibration may be due to misaligned installation, requiring repositioning and installation.