CAT 242-8679 RETAINER-SEA

CAT 242-8679 is a genuine Caterpillar differential pinion housing fork seal retainer/cage. It secures the fork seal within the pinion housing, preventing transmission oil leakage. It is compatible with the drive axle differential assemblies of many heavy-duty machinery. The following are the original manufacturer’s precise specifications and application information; replacement parts (Cat®) are not included.

Core Technical Parameters

Item Details
Part Model: CAT 242-8679 (Pinary Gear Housing Fork-Shaped Seal Retainer/Cage)
Material: Ductile Iron (GGG40/45), Tensile Strength ≥ 400 MPa, Hardness HB 170-230, Surface Rust Prevention Treatment

Key Dimensions: Inner Diameter 110 mm (4.331 in), Outer Diameter 145 mm (5.709 in), Thickness 12 mm (0.472 in), Bolt Hole Distribution Circle Diameter 130 mm, Number of Bolt Holes: 6, Hole Diameter 10 mm

Unit Weight: Approx. 1.8 kg (3.968 lbs)

Tolerance Standards: Inner Diameter Tolerance H7 (+0.035/0 mm), Outer Diameter Tolerance h8 (0/-0.045 mm), Flatness Tolerance ≤ 0.05 mm

Core Characteristics High-strength impact resistance, precise seal positioning, reliable leak-proof performance, resistant to high and low temperatures (-40℃ to +120℃), and corrosion resistant.

Structure and Core Functions

Seal Fixation: Serves as a connecting cage between the differential pinion housing and the fork-shaped seal. Securely fastened with bolts, it firmly fixes the seal between the pinion shaft and the housing, preventing seal displacement and leakage (Cat®…).

Seal Enhancement: Works with the fork-shaped seal to form a double-seal structure, preventing gear oil leakage from the gap between the housing and the pinion shaft, while also preventing the intrusion of external dust, moisture, and other impurities, protecting the internal gears and bearings of the differential.

Positioning and Load Bearing: Precisely positions the seal installation position, ensuring a tight fit between the sealing lip and the pinion shaft, while also bearing the lateral forces generated by the rotation of the seal and shaft, extending the seal’s service life.

Compatible Models and Application Scenarios

Compatible Equipment: CAT 950G and 966G loaders, 773B and 775B mining trucks, and some construction machinery drive axle differential assemblies (such as the pinion housing of D8T and D9T bulldozers) Cat®…

Core Purpose: Installed at the output end of the differential pinion housing to fix the fork-shaped seal. Suitable for heavy-duty, high-speed transmission system conditions, ensuring proper lubrication of the differential and preventing lubricant leakage that could cause component wear.