Description
CAT 8E-5284 21.01mm Needle Roller Caged Bearing
| CAT 8E-5284 21.01mm Needle Roller Caged Bearing |
| CAT 219-5428 BUSH |
| CAT 141-3049 BEARING |
| CAT 5P-9538 BRG SPH RLR |
| CAT 141-9865 CAP BRG |
| CAT 200-3275 62mm Outer Diameter Needle Bearing |
| CAT 160-6308 158mm Long Bearing Cap |
| CAT 533-6974 Deep Groove Ball Bearing |
The CAT 8E-5284 is a Caterpillar needle roller bearing without an inner ring solid cage. It is suitable for the gearbox or drive axle gear shaft support of Cat 12G/140G graders, D6D bulldozers, and other models. It is used for radial positioning and friction reduction under high speed and light to medium loads and is a key small bearing component in the transmission system. The following is structured technical and application information:
Core Technical Parameters
Item Details
Basic Attributes
Model 8E-5284, Type: Needle roller bearing without inner ring (solid cage), Material: Bearing steel (GCr15, HRC60-64), Weight: Approx. 0.08 kg, Suitable Temperature: -40℃ to +120℃, Mounting Method: Press-fit, No seal, No oil groove/oil hole (relies on system oil lubrication)
Key Dimensions
Inner Diameter: 30 mm (suitable shaft diameter tolerance f6, 29.98-29.99 mm), Outer Diameter: 42 mm (tolerance g6, 41.97-41.99 mm), Width: 12 mm (tolerance ±0.1 mm), Needle Roller Diameter: 2.5 mm, Cage Material: Phenolic resin, Press-fit Interference: 0.015-0.03 mm
Suitable Models and Locations
Suitable for Cat 12G grader gearbox second shaft gear support, 140G Grader drive axle differential half-shaft bearings, D6D bulldozer steering clutch release bearing housings, 1-2 pieces per axle, bearing pure radial load (maximum radial force ≤22 kN).
Performance Parameters: Rated radial load 22 kN, limiting speed 8000 rpm (oil lubrication), coefficient of friction ≤0.003, number of needle rollers 18, cage-guided outer ring, outer diameter expansion after press fitting ≤0.01 mm.
Structural and Performance Advantages:
Compact and Efficient: The inner ring-less design provides high radial load capacity in a small installation space, suitable for compact transmission components such as gearboxes and drive axles, reducing overall weight.
Wear and Impact Resistant: GCr15 bearing steel needle rollers are hardened, offering excellent hardness and wear resistance. The solid cage effectively prevents needle roller skewing, suitable for frequent start-stop and load fluctuation conditions.
Easy Installation: The outer ring is press-fitted into the bearing housing, and the inner hole directly mates with the shaft, requiring no additional tightening, resulting in high installation efficiency and suitability for batch maintenance scenarios.
Highly adaptable: Precisely matches the original shaft diameter and bearing housing bore, ensuring smooth operation of the transmission system and reducing gear meshing impact and vibration.
Installation and Maintenance Points: Before installation, clean the bearing housing bore, shaft diameter, and bearing, checking for burrs and scratches; use a press to press the bearing outer ring into the housing bore (pressure 3-5 MPa), ensuring the end face is flush with the housing bore. Do not strike the needle rollers or cage.
Maintenance every 1500 hours: Check for abnormal bearing operating noise, temperature (≤80℃), and shaft diameter wear (maximum wear ≤0.05 mm). Replace immediately if out of tolerance; regularly check the system oil level and cleanliness. Cat DEO 15W-40 machine oil is recommended for lubrication.
Prioritize original parts. Aftermarket parts may have insufficient needle roller precision or inadequate cage strength, easily leading to premature wear, needle roller detachment, and transmission component jamming and malfunction.
