CAT 6D-5974 19.05mm Inner Diameter Needle Roller Bearing

CAT 6D-5974 is a stamped outer ring needle roller bearing specifically designed for Caterpillar gearboxes and planetary gearbox transmissions. It features a ringless design, relying on the journal surface as the raceway to bear radial loads. Suitable for high-speed, confined space applications, it boasts high load capacity, lightweight construction, and a compact structure. Key information is as follows:

Core Parameters
Item Details
Basic Attributes
Model 6D-5974, stamped outer ring needle roller bearing (shell type), ringless, bears pure radial loads, suitable for linear speeds ≤10m/s, used in gearbox planetary gears and driveshaft support components.

Suitable Machines
Cat D3, D4, D5 and other small bulldozers, 938, 950 loaders, 307, 308 excavators, etc., compatible with 3204, 3054 engine transmission systems. 2-4 bearings are required per machine.

Material and Manufacturing Process
Outer ring is made of low-carbon steel by stamping; needle rollers are made of high-carbon chromium bearing steel (GCr15), surface hardened (HRC). 60-64); Cage is made of phenolic resin or stamped steel plate, providing good guiding properties; Operating temperature -30℃ to +120℃, requires oil lubrication (viscosity ISO VG 32-68)

Key Dimensions: Outer diameter 57.15mm (2.25in), Inner diameter 44.45mm (1.75in), Width 19.05mm (0.75in), Needle roller diameter 3.97mm, Quantity 12, Weight approx. 0.12kg, Shaft clearance 0.015-0.03mm

Functional Parameters: Radial rated load 180kN, limiting speed 8000rpm (oil lubrication), clearance fit (mounting hole tolerance H7), compatible journal surface roughness Ra≤0.8μm

Matching Components: Compatible journal 4B-4320, planetary gears 6L-9774 requires a special mounting sleeve. It is recommended to use with transmission fluid and replace the transmission filter regularly.

Alternative Models: Can replace older needle roller bearings such as 310-6157 and 141-5950.

Installation and Maintenance Points:

Preparation before installation: Clean the mounting hole and journal surface to remove burrs, oil, and metal debris; check for missing or deformed needle rollers and cracks in the outer ring; measure the journal diameter and mounting hole diameter to ensure the clearance meets requirements; the journal surface must be hardened (HRC≥58) and the roughness must meet requirements.

Installation Steps: Apply a small amount of transmission fluid to the journal surface. Press the bearing smoothly into the mounting hole (pressing force ≤10kN), do not strike the bearing outer ring; install the journal, ensuring the shaft and bearing coaxiality is ≤0.02mm; install the planetary gear or transmission components, and tighten the fixing bolts to the specified torque.

Maintenance and replacement: Check the bearing’s operating condition every 2000 hours and listen for any abnormal noises; check for metal debris in the transmission fluid each time you change it; replace the bearing immediately if the needle rollers are worn, the outer ring is deformed, or there is any jamming.