CAT 222-4616 CAP-BEARING

CAT 222-4616 is a Caterpillar steel bearing end cap (dust cover/cover), which is suitable for the bearing housing of the transmission system of equipment such as excavators and loaders. It is used to seal the bearing cavity, prevent dust and moisture, fix the outer ring of the bearing, and protect the internal bearing (such as the 081-4872 self-aligning roller bearing), and is suitable for heavy-duty vibration conditions. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 222-4616, Type: Bearing end cover (with O-ring seal), Material: Carbon steel (Q235B), Surface: Zinc-plated passivated (corrosion resistance grade IP65), Single weight: Approximately 1.2 kg, Suitable temperature: -40℃ to +120℃, Seal material: Nitrile rubber (NBR), Hardness: Shore A 70-80

Key Dimensions
Inner diameter: 150.0 mm (suitable bearing outer ring diameter, tolerance +0.10/-0.05 mm), Outer diameter: 180.0 mm (tolerance ±0.15 mm), Thickness: 20.0 mm (tolerance ±0.10 mm), Number of mounting holes: 4, Hole diameter: 14.0 mm (tolerance +0.10/-0.05 mm), Hole spacing circle diameter: 165.0 mm (tolerance ±0.10 mm), Locating stop diameter 150.0 mm (tolerance +0.05/-0.05 mm), O-ring groove diameter 155.0 mm, groove width 3.0 mm, groove depth 2.5 mm
Compatible Models and Parts: Compatible with Cat 320D2 and 336D2 excavators, 966M and 972M loaders. Used in final drive reduction gearboxes and gearbox output bearing housings. Parts include 081-4872 bearing, 7Y-0597 gasket, and 9R-2498 bolts (M12×30). Installation torque 80-100 N・m
Performance Parameters: Sealing pressure ≤0.3 MPa, impact strength ≥50 J/cm², flatness ≤0.05 mm, bolt hole coaxiality ≤0.10 mm, service life ≥5000 hours, withstands vibration frequency 5-500 Hz
Structural and Performance Advantages: Carbon steel material + Zinc plating and passivation: Provides high strength and rigidity. The zinc passivation layer enhances corrosion resistance, making it suitable for humid and dusty environments and extending service life.

Integrated O-ring seal groove: Pre-installed NBR O-rings effectively prevent dust and moisture from entering the bearing cavity, reducing grease leakage and ensuring bearing lubrication.

Precise positioning stop: The stop fits tightly with the bearing housing, ensuring coaxiality between the bearing cap and housing, avoiding seal failure or bearing damage caused by installation misalignment.

Multiple bolts for even tightening: Four symmetrically distributed mounting holes evenly distribute tightening force, preventing bearing cap deformation and improving sealing and fixing reliability.

Installation and maintenance points: Before installation, clean the bearing cap and bearing housing end faces to remove oil, rust, and burrs; check the O-ring for damage, apply a small amount of grease (Cat DEO-ULS 15W-40) to the O-ring surface, and embed it into the seal groove.

Align the positioning stop and tighten the four M12×30 bolts evenly in a symmetrical, alternating pattern, in 2-3 stages until the torque reaches 80-100 N·m, ensuring a tight fit between the bearing cap and bearing housing with a gap ≤0.05 mm.

Maintenance: Check the seal every 2000 hours. If the O-ring is aged, damaged, or the bearing cap is deformed, replace it immediately. Regularly check the bolt torque to prevent loosening that could lead to seal failure.