CAT 9T-3879 BEARING AS

CAT 9T-3879 is a Caterpillar genuine cylindrical roller bearing assembly, suitable for high-speed rotating components such as hydraulic pumps, gearboxes, and transfer cases that bear medium to heavy radial loads. It provides stable support and precise radial positioning. The following is the information for this genuine part:

Core Technical Parameters
Item Details
Part Model: CAT 9T-3879 (9T3879) Cylindrical Roller Bearing Assembly, weighing approximately 0.45 kg (1.00 lb). It is a separable structure with a cage, consisting of an inner ring, outer ring, cylindrical rollers, and a stamped cage. The outer ring has an axial positioning groove.

Core Materials: Inner and outer rings (bearing steel, surface carburized and hardened HRC 60-64); Rollers (high carbon chromium bearing steel, integrally hardened HRC 62-66); Cage (08Al steel plate stamping, surface galvanized, corrosion resistant)

Key Dimensions: Inner diameter 40 mm, outer diameter 68 mm, total width 15 mm diameter, roller diameter 7 mm, length 12 mm, cage window size 7.2 mm × 12.2 mm, outer ring locating groove width 2 mm, depth 1 mm

Rated Parameters: Rated radial dynamic load 28.5 kN, rated radial static load 26.8 kN, limiting speed (oil lubrication) 8500 rpm, (grease lubrication) 5200 rpm, suitable temperature -40℃ to +120℃

Suitable Operating Conditions: High-speed rotation, medium to heavy-duty radial load conditions such as hydraulic pump input shaft, gearbox output shaft, transfer case intermediate shaft, etc. Suitable for vibration and impact conditions, but cannot withstand axial loads.

Suitable Machine Models: CAT 320D/323D excavator (hydraulic pump input shaft), 966H/972H loader (gearbox output shaft), 140M grader (transfer case intermediate shaft), 3406E/C15 engine (auxiliary drive pump shaft)

Matchings: Compatible bearing inner ring spacer 10R-2884, Outer Ring Locating Ring 6V-7853, Fixing Bolt 8T-4127, Grease Nipple 1U-8878 Core Functions and Structural Features:

High-Speed ​​Adaptability: Separate cylindrical roller design, with rollers in contact with the raceway line, adapts to high-speed rotation, reduces frictional heat generation, and ensures stable operation of the equipment over long periods.

High Radial Load Capacity: Adapts to medium and heavy-duty radial loads, can withstand impact loads, reduces radial runout of the shaft, and improves transmission accuracy and efficiency.

Precise Positioning: The outer ring has an axial positioning groove, which, together with the locating ring, prevents axial movement of the bearing, ensures coaxiality during installation, and reduces vibration and noise.

Easy Maintenance: The separate structure facilitates disassembly and replacement without special tools, allowing for quick on-site maintenance and reducing downtime.