CAT 420-5764 BEARING SLEE

CAT 420-5764 is a straight-tube bearing sleeve (steel-backed bronze bushing) used by Caterpillar for the gearboxes/drive axles of mini excavators and loaders. Its core function is to provide precise radial positioning of the bearing, reduce shaft-to-bore clearance, and absorb shock. It is compatible with Cat 305-307 mini excavators and 903-906 mini loaders. The following is precise technical and application information.

Core Parameters (Precise Version)

Project Details
Basic Attributes
Model 420-5764, Straight-tube bearing sleeve (bushing), used for bearing outer ring positioning/journal protection, compatible with gearbox second shaft, drive axle differential bearing housing, single unit usage 1-2 pieces, matching bearing models 293-1986, 172-6050
Compatible Models: Cat 305.5E2, 306, 307 mini excavators, 903D, 904K, 906M small loaders, compatible gearbox model 416-4000, drive axle model 155-4022, engine 3054C, 3056E
Material and Process: Steel backing + bronze alloy (CuSn8P), steel backing thickness 2mm, bronze layer thickness 1.5mm, surface graphite inlay self-lubricating, no internal or external oil grooves, no lubrication holes (relies on bearing lubrication system for oil supply), hardness HB 80-100, dimensional tolerance ISO h6
Key Dimensions: Inner diameter 65mm, outer diameter 75mm, length 28mm, wall thickness 5mm, chamfer R1mm, locating groove diameter 65mm (depth 1mm), weight approx. 0.22kg
Performance Parameters: Maximum radial load 35kN, operating temperature -40℃ to +120℃, suitable speed ≤3000rpm, interference fit 0.01-0.03mm (with bearing housing bore), clearance fit 0.005-0.015mm (with bearing outer ring)
Core Functions and Applications:
Positioning and Protection: Provides precise radial positioning for the bearing outer ring, preventing bearing eccentricity during operation, while protecting the journal and bearing housing bore from direct contact wear, suitable for low-to-medium speed and medium load conditions.

Clearance Compensation: Through reasonable interference and clearance fits, compensates for manufacturing errors in the shaft and housing bore, absorbs shocks and vibrations during operation, and reduces noise and wear. Typical locations: Gearbox second shaft bearing housing, drive axle differential bearing bore, used for installing 293-1986 tapered roller bearings or 172-6050 needle roller thrust bearings, suitable for bearing positioning requirements in tight spaces.

Installation and Maintenance Points

Before installation: Clean the bearing housing bore and journal, check the sleeve for deformation, cracks, or surface peeling; measure the housing bore diameter (75mm), ensuring a clearance of 0.01-0.03mm between the bearing housing bore and the sleeve outer diameter; prepare the press-in tool (press-in pressure approximately 8-12kN).

During installation: Maintain coaxiality during press-in, apply uniform pressing force, and after press-in, check the sleeve end face runout to be ≤0.05mm; after installation, inject extreme pressure lithium-based grease (NLGI 2) to ensure adequate lubrication of the bearing and sleeve.

Maintenance and replacement: Check the sleeve wear and fit clearance every 5000 hours. If abnormal noise occurs, the sleeve wear exceeds 0.2mm, or scratches appear on the surface, replace it immediately. Welding or repair by welding is prohibited.