274-7469: Bearing – Needle(Debris Resistant)

Cat 274-7469 is a Caterpillar needle roller bearing assembly with chip-resistant seals. It features a reinforced dustproof seal and is suitable for use in construction machinery gearboxes, hydraulic pumps, drive axles, and other applications involving debris. It can withstand high radial loads. Below are the core parameters and application points:

Core Parameters (Precise Version)

Item Details
Basic Information
Model 274-7469, type is a needle roller bearing without an inner ring (with cage + double-sided chip-resistant double-lip seal), conforms to GB/T 5801-2018 standard, suitable for low-to-medium speed, heavy-duty, and dusty/debris-prone conditions. Used in gearbox input shafts, hydraulic motor output shafts, drive axle half shafts, steering knuckle shafts, etc., it can compensate for minor shaft misalignment and ensure transmission accuracy.

Compatible Models
Compatible with Cat 320GC/323GC excavators, 950M loaders, 420F2 backhoe loaders, C9.3 engines, 299D3 engines. Commonly used in skid steer loaders, etc., for gearbox secondary shafts, drive axle differential side cover shafts, hydraulic pump drive shaft supports, and steering cylinder piston rod guide parts.

Material and Manufacturing Process: The needle rollers and cage are made of high-carbon chromium bearing steel (100Cr6), with a needle roller diameter of 2.5mm, integrally quenched (HRC60-64) + ultra-precision ground (Ra≤0.1μm); the anti-shard seal is made of nitrile rubber (NBR) + metal skeleton, with a dustproof scraper on the sealing lip, IP65 protection rating, which can resist the intrusion of dust, mud, and metal debris; the cage is made of glass fiber reinforced nylon, which has high strength and wear resistance.

Key Dimensions: Inner diameter 40mm, outer diameter 52mm, total width 18mm, needle roller length 16mm, number of needle rollers 24, chamfer C1, weight approximately 0.12kg, radial clearance 0.01-0.025mm, interference fit with shaft. 0.008-0.015mm, rated dynamic load 28kN, rated static load 42kN, limiting speed (grease lubrication) 3600r/min
Compatible Components: Compatible with 40mm diameter smooth shafts (surface hardness HRC58-62, roughness Ra≤0.4μm), matching seal model TC40×52×7, recommended use of Cat 10-9275 extreme pressure lithium-based grease, installation coaxiality requirement ≤0.02mm
Function, Installation and Maintenance Points:
Core Function: The anti-debris seal prevents external impurities from entering the bearing, avoiding wear on the needle rollers and raceways; the inner ring-less design saves installation space, adapts to compact structures, and can withstand high radial loads (rated dynamic load 28kN), used for torque transmission and support positioning, ensuring efficient component operation.

Installation Points: Cold fitting is recommended. Apply clean grease to the shaft surface and press it in evenly using a special sleeve. Do not hammer. The flatness of the bearing housing mounting surface should be ≤0.015mm. Bolt torque should be 60-70 N·m, tightening diagonally and evenly to ensure the sealing lip fits snugly against the shaft surface without leakage.

Maintenance Points: Check the sealing and lubrication condition every 300 hours and replenish grease every 500 hours. Replace the bearing immediately if pitting occurs on the needle roller, the sealing lip ages, or the radial clearance exceeds 0.05mm to prevent component damage.