CAT 4K-6760 234.95mm Outer Diameter Bearing Cap

CAT 4K-6760 is a Caterpillar bearing cap, mainly used for positioning and sealing of wheel hub, differential, or gearbox bearings in loaders, bulldozers, and other equipment. It is compatible with Cat 966H and 966M loaders, D6D/D6E bulldozers, and other models. It can fix the outer ring of the bearing, prevent lubricating oil leakage and impurity intrusion, and is a key protective component for the bearing assembly of the transmission system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 4K-6760, Type: Flange-type bearing end cover, Material: Q235 low carbon steel (zinc-plated and passivated surface, corrosion resistance grade C3), Single weight: approx. 1.2 kg, Applicable temperature: -40℃ to +120℃, Sealing type: O-ring seal (matching O-ring 12×2.4 mm, material: NBR), Fastening method: Bolt connection (4×M12×1.75 bolts), Protection grade: IP65, Applicable bearing models: CAT 328-5240 bushing bearings, 435-5200 bearing assemblies, etc.

Key Dimensions
Outer diameter: 120 mm (tolerance ±0.15 mm), Inner diameter: 80 mm (tolerance 0 to +0.025 mm), Flange thickness: 10 mm (tolerance ±0.10 mm), Overall length: 35 mm (tolerance ±0.15 mm) Bolt hole distribution circle diameter 100 mm (tolerance ±0.10 mm), bolt hole diameter 13 mm (tolerance +0.10 mm), O-ring groove diameter 95 mm (tolerance ±0.05 mm), groove depth 2.5 mm (tolerance ±0.05 mm), chamfer 2 mm × 45°. Compatible Machines and Applications: Compatible with Cat 966H and 966M loaders, D6D/D6E bulldozers, for end cover sealing of wheel hub bearings, differential output shaft bearings, and gearbox input shaft bearings. Matching parts include O-rings, bolts, and washers. Rated working pressure 0.8 MPa, maximum speed 3000 rpm, compatible bearing outer diameter 80 mm. Performance Parameters: Sealing pressure 0.8 MPa, impact load ≥20 kN, rear end face runout ≤0.05 mm, flatness ≤0.03 mm, bolt torque 85 N・m, O-ring compression. 20%-25%, Service Life ≥ 5000 Hours
Structural and Performance Advantages

Reliable Protection: The flange structure combined with O-ring seals effectively prevents lubricant leakage and the intrusion of dust and moisture, suitable for harsh outdoor working conditions, protecting the bearing from contamination and wear.

Precise Positioning: Precise inner diameter and bolt hole positions ensure a secure fixation of the bearing outer ring, preventing axial movement during operation and ensuring stable operation of the transmission system.

Easy Installation: The integrated flange design allows direct bolt fixing to the bearing housing, and installation with standard O-rings, facilitating quick on-site replacement and reducing downtime.

High Durability: The low-carbon steel material is galvanized and passivated, providing excellent corrosion resistance. Compared to ordinary carbon steel end caps, its service life is approximately twice that of ordinary carbon steel end caps, suitable for heavy-load and vibration conditions.

Installation and Maintenance Points: Before installation, clean the end cap, bearing housing, and O-ring. Check the end cap for deformation, cracks, and rust. During assembly, apply grease (Cat Moly Grease Plus recommended) to the O-ring surface and tighten the bolts evenly (torque 85 N·m) to ensure uniform O-ring compression and no leakage.

Every 500 hours of maintenance, check the end cap bolts for looseness and the O-ring for aging or damage. Replace immediately if the O-ring shows cracks, hardening, or the end cap is deformed.

Prioritize original equipment manufacturer (OEM) parts for replacement to ensure dimensional accuracy and sealing performance. Aftermarket parts may cause seal failure due to insufficient material or machining precision, leading to bearing damage.