CAT 624-3933 80mm Inner Diameter Straight Sleeve Bearing

CAT 624-3933 (6243933) is a Caterpillar genuine straight sleeve bearing with an inner diameter of 80mm. It is suitable for hinged parts such as booms and connecting rods of loaders/excavators. The following is purely accurate information (without additional description):

Core Parameters and Information

Item Details
Part Model: CAT 624-3933 Straight Sleeve Bearing

Part Type: Heavy-duty machinery hinged straight sleeve bearing, used for radial support between pins and structural components, absorbing impact loads, and reducing friction and wear at the hinge.

Material: Steel backing + high-tin bronze alloy anti-friction layer (steel backing 42CrMo, alloy layer CuSn10Pb10, layer thickness 0.30-0.35mm), surface hardened, hardness HRC28-32

Key Dimensions: Inner diameter 80.00 mm, outer diameter 95.00 mm, total length 100.00 mm mm, wall thickness 7.50 mm, roundness ≤0.010 mm, cylindricity ≤0.015 mm, no flange, no oil hole, no lubrication groove on the inner wall

Structural Features: Straight cylindrical structure with uniform wall thickness, no chamfers at both ends, fixed to the mounting holes of structural components by interference fit, and rotated by clearance fit with the pin.

Compatible Structures: Matches the boom pin and frame/boom mounting holes for radial positioning and load transfer at the articulation points.

Applicable Working Conditions: Medium to high speed, heavy load, suitable for outdoor operation (-40℃ to 120℃), dusty, vibration and impact, and grease-lubricated operating environments.

Compatible Models:
CAT 980K/982M Wheel Loader (boom and rocker arm articulation point)
CAT 336GC/349GC Excavator (stick and boom articulation point)
CAT 140M3/160M3 Grader (draw frame and frame articulation point)
CAT 434F2/444F2 Backhoe Loader (Boom to Frame Connection)

Installation and Fitting Points:
The bearing should have an interference fit with the structural component mounting holes (interference 0.020–0.030 mm) and a clearance fit with the pin (clearance 0.035–0.055 mm) to ensure smooth and unobstructed rotation.

Use a dedicated pressing tool to press the bearing in smoothly. Do not directly strike the bearing end face. After installation, the bearing end face should be flush with the structural component plane, without skewing or looseness.

Before installation, clean the bearing, mounting holes, and pin. Check the bearing for cracks, deformation, and ensure the anti-friction layer is intact and free of scratches.

The bearing should be positioned radially by the mounting holes and axially by the steps of the structural component. After installation, check that the hinged joint rotates smoothly without jamming, the radial runout of the pin is ≤0.06 mm, and there are no abnormal clearances.

According to the machine manual, check the bearing clearance every 1500 working hours. Replace the bearing if the clearance exceeds 0.12 mm.