CAT 161-8269 84.98mm Inner Diameter Needle Roller Bearing

CAT 161-8269 (1618269) is a Caterpillar double-row self-aligning roller bearing, suitable for drive axles, final drives, or hydraulic motors in loaders/excavators. It is compatible with high-quality YM/SEM/GD replacement parts. The following are the core technologies and compatibility information:

Core Technical Parameters
Item Details
Part Model CAT 161-8269 (1618269) Double-row self-aligning roller bearing (suitable for drive axles/final drives/hydraulic motors, withstands high radial + bidirectional axial loads, allows ±2° angular misalignment, compatible with YM/SEM/GD replacement parts)

Core Materials
Rings: GCr15 bearing steel (HRC 58–62), raceways ultra-fine ground (Ra≤0.08 μm), cage: integral brass (CuZn39Pb3), symmetrical double-row rollers, with inner ring guide, compatible with lithium-based grease (NLGI 2, -30℃ to + (120℃)

Key Dimensions: Inner diameter 140 mm, outer diameter 250 mm, width 84 mm, taper of the conical bore 1:12, rolling element diameter 22 mm, quantity 28 pieces, mounting surface runout tolerance ≤0.02 mm, compatible with M20×1.5 bolts (mounting hole spacing 220 mm)

Unit Weight: Approx. 14.2 kg (31.31 lb)

Compatible Models: CAT 980G/980H wheel loaders (drive axle), 336D/336F excavators (final drive), CAT 3516 engine (fan drive shaft), commonly used with 161-8270 outer ring and 161-8271 seals

Operating Fit: Rated radial load 780 kN, rated axial load 320 kN, limiting speed 2200 rpm, operating temperature -40℃ to + 150℃, suitable for heavy-duty impact and shaft misalignment conditions.
Core Functions and Structural Features:

Self-aligning capability: Double-row spherical roller design allows for ±2° shaft misalignment, compensating for frame/axle housing deformation and installation errors, reducing additional stress on the transmission system, and adapting to dynamic positioning under complex working conditions.

Heavy-duty load-bearing design: Symmetrical double-row rollers + large contact angle, rated radial load up to 780 kN, impact load resistance 900 kN, wear rate ≤0.01 mm/1000 hours, suitable for harsh on-site working conditions.

Bidirectional axial load: Can withstand bidirectional axial loads (160 kN per row), suitable for bidirectional thrust conditions of drive axle differential/final drive, eliminating the need for additional thrust bearings and simplifying the transmission structure.

Replacement parts compatibility: YM/SEM/GD quality parts are consistent with the original equipment manufacturer (OEM) in material, size, and tolerance, offering near-OEM compatibility and durability, and higher cost-effectiveness.

Integral Brass Cage: CuZn39Pb3 brass cage, high strength, good heat dissipation, suitable for a 2200 rpm limiting speed, prevents roller misalignment and jamming, and is suitable for high-frequency vibration conditions.

Installation and Maintenance Points

Installation Specifications: Clean the mounting surface, ensuring it is free of rust, oil, and burrs. Bearing housing tolerance: +0.02–+0.03 mm, ensuring precise fit.

Hot fitting (oil temperature 80–90℃, heating for 25–30 min). Do not strike the end face to avoid damage to the raceway/rollers.

Tighten symmetrically with M20×1.5 bolts (grade 10.9), torque 240–260 N・m, controlling the preload clearance to 0.04–0.06 mm.

Maintenance Recommendations: Add lithium-based grease (NLGI 2) every 1500 working hours, adding 100–120 g each time, until old grease is removed.

Inspect for any missing rollers, deformed cages, damaged seals, or grease leaks. Replace immediately if any abnormalities are found.

Prioritize replacement parts from CAT original manufacturers or YM/SEM/GD of the same specifications, ensuring compatibility with the outer ring and seals.