NISSAN 40578-VB00A Swivel Hub Grease Seal Retaining Plate

The genuine NISSAN (SKU: 40578-VB00A) grease wiper seal retaining plate (GUARD-SEAL) is a premium-quality original component designed for the vehicle's front axle swivel hub. This precision-engineered retaining plate secures the wiper seal in a stable, displacement-free position.

Function and Importance

The primary role of the retaining plate is to apply even pressure to the grease wiper seal, ensuring an optimal seal at the rear of the swivel hub housing. It prevents the escape of specialized grease needed to lubricate the CV joint, while effectively shielding against the ingress of external contaminants such as water, mud, dust, and sand. This directly helps protect the constant velocity (CV) joint and kingpin bearings from accelerated wear and failure.

Technical Specifications

• Manufacturer: NISSAN (Original Equipment Manufacturer)
• OEM Part Number (SKU): 40578-VB00A
• Reference / Alternative Numbers: 40578VB000, 40578-VB000
• Material: Heavy-duty stamped structural steel
• Surface Finish: Corrosion-resistant coating against environmental elements and road salt moisture
• Fitting Position: Front axle, swivel hub (fits both left and right sides)

Signs of Wear or Damage

Because the part is directly exposed to the elements, replacement is recommended if any of the following occur:

• Corrosion and Rust: Surface rust can degrade the structural integrity of the plate over time, leading to a loss of clamping force.
• Mechanical Deformation: During off-road driving, impacts from stones or branches can bend the plate, preventing the seal from seating evenly.
• Grease Leakage: Fresh grease appearing around the rear of the swivel hub ball indicates that the retaining plate may be loose or deformed.