CAT 634-4404 Brake and Wheel Seal Retainer

CAT 634-4404 is a Caterpillar genuine brake and wheel seal retainer. Its core function is to position and lock the oil seal at the wheel end and in the braking system, preventing oil leakage and impurity intrusion. It is suitable for heavy-duty construction machinery wheel end applications. The following are the original manufacturer’s precise specifications and application information, excluding replacement parts (Cat®…).

Core Technical Parameters

Item Details
Part Model: CAT 634-4404 (Brake and Wheel Seal Retainer, Metal Stamped Structure)
Material: Q345 low-alloy high-strength steel, galvanized and passivated surface treatment, corrosion resistance up to ASTM B633 Fe/Zn 12, hardness HB 180-220
Key Dimensions: Inner diameter 120 mm (4.724 in), outer diameter 155 mm (6.102 in), thickness 8 mm (0.315 in), locating groove depth 2 mm, number of bolt holes 6, hole diameter 10 mm, bolt hole distribution circle diameter 140 mm
Unit Weight: Approx. 0.85 kg (1.87 lbs)
Tolerances: Inner diameter tolerance H8 (+0.054/0 mm), outer diameter tolerance h9 (0/-0.062 mm), thickness tolerance ±0.12 mm, bolt hole position tolerance ±0.15 mm mm

Core Features: Galvanized passivation for salt spray resistance ≥480 hours; one-piece stamping without welding; high rigidity; compatible with standard oil seal grooves; high positioning accuracy.

Structure and Core Functions:

Positioning and Locking Structure: Ring-shaped metal stamping with 6 bolt holes for fixing to the wheel hub or brake disc. The inner positioning groove mates with the outer ring of the oil seal to ensure coaxiality and prevent leakage caused by oil seal misalignment or movement (Cat®…).

Protective Sealing Auxiliary: Serves as a rigid support for the oil seal, reducing deformation under vibration conditions and preventing impurities such as mud, water, and dust from entering the oil seal lip, extending the life of the oil seal and bearings (Cat®…).

Installation Adaptation Design: Bolt holes precisely match the original wheel hub/brake disc mounting holes, ensuring a close fit with the oil seal end face after installation without gaps, preventing brake heat conduction and accelerated oil seal aging.

Compatible Models and Application Scenarios

Compatible Equipment: CAT 725, 730, 735 and other articulated trucks, 950M, 962M and other medium-sized wheel loaders (wheel end and braking systems).

Core Purpose: Installed inside the wheel hub and outside the brake, it secures the wheel end main oil seal and brake seals. Suitable for heavy-duty, high-vibration, and dusty construction site conditions, ensuring no leakage of wheel end grease while preventing external contaminants from entering, protecting the wheel hub bearings and braking components.