CAT 191-2569 Bearing – Needle(Debris Resistant)

CAT 191-2569 is a Caterpillar radial needle roller bearing cage roller assembly for articulated parts of heavy-duty equipment. It is compatible with the Cat 336D2/349D excavator boom/stick articulation point, 980M loader bucket rocker arm shaft, and D8T bulldozer pusher link. It can withstand high loads in limited radial space, is suitable for swing and impact conditions, and ensures smooth rotation of articulated parts. The following is structured technical and application information:

Core Technical Parameters
Item Details
Basic Attributes
Model 191-2569, Radial Needle Roller Bearing Cage Roller Assembly (including needle rollers + cage + end face seal), compatible with Cat 336D2/349D excavator boom/stick hinge point, 980M loader bucket rocker arm shaft, D8T bulldozer pusher linkage, material is chrome needle roller steel (quenched HRC60-64), cage is phenolic resin reinforced with cloth (high strength, self-lubricating), seal is nitrile rubber (NBR, oil resistant -40℃ to +120℃), operating temperature -40℃ to +120℃, single weight approximately 1.6 kg, used to withstand high radial loads, suitable for limited radial space, swing and impact conditions, ensuring smooth rotation of the hinged parts Cat® Parts
Key Dimensions
Inner diameter 80 mm (tolerance 0/-0.012 mm), outer diameter 105 mm mm, total width 32 mm, needle roller diameter 8 mm, quantity 28, radial clearance C3 (0.04-0.08 mm), fit tolerance inner ring k6 (+0.012/-0.001 mm), outer ring K7 (+0.025/-0.010 mm), journal fillet radius ≤1.2 mm, coaxiality ≤0.025 mm. Cat® Parts compatible models: Cat 336D2/349D excavators (boom/stick hinge), 980M loaders (bucket rocker arm shaft), D8T bulldozers (bullet linkage), 966M loaders (boom cylinder upper hinge). Cat® Parts assembly fit: inner ring interference fit with shaft (interference 0.008-0.012 mm), outer ring transition fit with bearing housing (clearance 0-0.018 mm), compatible with 80 mm bearings. For diameter shafts, the journal must be hardened (HRC58-62) and ground (Ra≤0.8 μm), and the bearing housing bore must also be hardened (HRC58-62) and ground (Ra≤0.8 μm). Cat® Parts Installation and Maintenance Points: Before installation, clean the components, journal, and bearing housing bore, checking for scratches, rust, and cracks. Measure the dimensions of the journal and outer ring bore to ensure the fit meets requirements. The journal fillet radius should be ≤1.2 mm to avoid stress concentration from contact between the needle rollers and the raceway.

Use the cold-press installation method. Use a special press to first press the outer ring into the bearing housing, then fit the inner ring onto the journal. Do not directly strike the inner or outer ring to prevent needle roller deformation and outer ring chipping. After installation, adjust the axial preload to 15-25 N・m to ensure no axial movement.

Lubrication and maintenance: The grease filling amount should be 30-40% of the bearing’s internal space (Cat Moly Grease is recommended); check the bearing wear and clearance every 800 hours. If the needle rollers show indentations, the outer ring wear exceeds 0.10 mm, or the radial clearance exceeds 0.12 mm, replace the bearing immediately.