CAT 3G-2569 Spherical Bearing Cap

CAT 3G-2569 is a Caterpillar original high-strength steel ball bearing cap used for axial positioning and dust sealing of ball bearings in the connecting rod, rocker arm, or steering mechanism of excavators/loaders. It weighs approximately 0.42 kg and is a single bearing housing unit. It is compatible with the spherical bearing assemblies of Cat 320/330 series excavators, 938K/950GC loaders, and other models. The following is professional structured information:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes Model 3G-2569, spherical bearing cap, compatible bearing outer diameter φ85 mm, positioning inner diameter φ75 mm, sealing groove diameter φ80 mm (compatible O-ring φ80×2.65 mm), operating temperature -40℃ to +120℃

Key Dimensions Overall outer diameter φ100 mm, flange thickness 10 mm, cap height 22 mm, flange bolt holes 2 (symmetrically distributed, diameter φ12 mm, hole center distance φ88 mm), spherical curvature radius R42.5 mm, sealing groove width 2.8 mm, depth 2.4 mm

Material and Process Material is 42CrMo alloy steel (quenched and tempered, HB 260-280, tensile strength ≥900 MPa), surface blackened + oil impregnation (corrosion resistant, salt spray test ≥72) h), flange end face flatness ≤ 0.04 mm, spherical surface roughness Ra ≤ 1.6 μm
Compatible Models: Compatible with boom/stick connecting rod ball bearings for Cat 320GC/330GC excavators, steering tie rod ball bearings for 938K/950GC loaders, or rocker arm ball bearings for 3054/3066 engines.
Assembly Fit: Gap between the bearing and bearing outer ring end face ≤ 0.08 mm, O-ring compression 0.25-0.45 mm, bolt preload torque 65-75 N・m, anti-loosening method: spring washer + thread locking adhesive (Loctite 243).
Installation and Maintenance Points: Before installation, clean the cover sealing groove, bearing outer ring end face, and bolt holes. Check for burrs, scratches, and deformation. Apply Cat 106-3962 lithium-based grease to the O-ring to ensure reliable sealing.

Align the positioning spherical surface with the bearing outer ring, and evenly tighten the two bolts (tighten diagonally in two stages to the preload torque) to avoid uneven loading that could lead to seal failure or bearing jamming.

After installation, check for leaks at the contact surface between the cover and the bearing housing. Manually swing the connecting rod/rocker arm without jamming. After 50 hours of operation, retighten the bolts and check for torque decay.

Maintenance cycle: Check the sealing condition every 300 hours. Replace the O-ring promptly if it is aged, damaged, or the cover is deformed. It is recommended to replace it simultaneously with the spherical bearing to ensure positioning accuracy.