8X-3375: Axle Housing Cap

The CAT 8X-3375 is a Caterpillar Drive Axle Differential Housing End Cap, used to seal the differential housing of axles, secure bearings, and protect internal gears. It is suitable for heavy-duty wheeled and tracked equipment. Key information is as follows:

Key Parameters
Item Details
Type: Integral heavy-duty end cap with sealing grooves, bolt holes, and locating stops. Fits the differential housing, providing both sealing and bearing positioning functions. Excellent impact resistance and leak-proof performance.

Dimensions (Metric/Imperial): Inner diameter approx. 152.40 mm (6.0 inches), outer diameter approx. 228.60 mm (9.0 inches), thickness approx. 44.45 mm (1.75 inches), bolt hole diameter 19.05 mm (3/4 inch), 8 holes circumferentially distributed, hole spacing diameter 190.50 mm (7.5 inches)

Material Ductile iron (QT500-7), tensile strength ≥500MPa, elongation ≥7%; surface coated with anti-rust primer, suitable for fluororubber (FKM) or nitrile rubber (NBR) seals, oil resistant temperature -40℃~150℃

Accuracy: Stop diameter tolerance ±0.03mm, flatness tolerance ≤0.02mm, bolt hole position tolerance ≤0.04mm, ensuring precise fit and long-term sealing with the housing.

Installation Method: Bolt tightening, with sealing gasket/ring, pre-tightening torque according to the equipment manual (usually 220-250N・m), positioning stop to prevent offset, ensuring reliable sealing and positioning.

Suitable Scenarios: Compatible with Cat 966H/966K loaders, D6T bulldozers, 320D/323D. The differential housing of the drive axle in excavators and other equipment, and the end of the steering drive axle, are used to seal the differential cavity, prevent gear oil leakage, block dust and moisture intrusion, protect gears and bearings, and are suitable for heavy-duty working conditions such as mining and infrastructure construction, extending the service life of the axle.

Commonly used for replacement during equipment maintenance/overhaul, it is compatible with original seals and fasteners, improving maintenance efficiency without requiring additional fittings.

Performance Characteristics: Made of ductile iron, its deformation resistance is approximately 50% higher than ordinary gray cast iron, capable of withstanding high-frequency vibration and impact loads on the axle.

Integrated structure + sealing groove design ensures high sealing reliability, with a protection level up to IP66, suitable for dusty, humid, and heavy-duty harsh environments.

Standardized bolt holes and positioning stops ensure convenient installation and precise positioning, allowing for quick replacement and reducing equipment downtime.

Matching and Replacement

Matching Seals: 3T-4567 gasket, 6V-3211 sealing ring; Matching Bolts: Grade 10.9 high-strength bolts (e.g., 12-9142). It is recommended to replace them as a set to ensure sealing performance.

Direct Replacements: 8X-3376, 9J-2588. These are interchangeable and suitable for the same equipment and installation conditions.