CAT 325-6038 CAP-BEARING-GD

CAT 325-6038 is a genuine Caterpillar GD series end cap/cover plate, adapted for the hydraulic pump, gearbox, or cylinder ports of excavators, loaders, and other construction machinery, used for sealing, protection, dust and water resistance. The following is pure original data and does not include replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 325-6038, Type GD Series Sealing End Cap, Material Q345 Carbon Steel (Stamped), Surface Treatment Epoxy Primer + Caterpillar Yellow Topcoat, Unit Weight 0.92 kg, Operating Temperature -40℃ to +120℃, Protection Rating IP67, Sealing Method Nitrile Rubber (NBR) O-ring + Metal Flat Seal, Applicable Pressure ≤35 MPa, Installation Method Bolt Fastening, No Pressure Relief Structure, Applicable Port Flange Standard SAE J518

Key Dimensions (Metric/Imperial)
Outer Diameter 180 mm (7.087 in), Inner Diameter 120 mm (4.724 in), Thickness 12 mm (0.472 in), Number of Bolt Holes 6, Bolt Hole Diameter 14 mm (0.551 in), Bolt Hole Distribution Circle Diameter 150 mm (5.906 in), Locating Stop Diameter 125 mm (4.921 in), stop depth 5 mm (0.197 in), flatness ≤0.05 mm, surface roughness Ra≤1.6 μm, outer diameter tolerance + 0.1/-0.05 mm, thickness tolerance + 0.08/-0.04 mm

Performance Parameters: Tensile strength ≥550 MPa, yield strength ≥345 MPa, hardness HB 180-200, coating adhesion grade 1 (cross-cut test), salt spray resistance ≥240 hours, O-ring hardness 70 Shore A, O-ring operating temperature -30℃ to +100℃, sealing surface contact pressure ≥1.5 MPa

Structure and Compatibility Characteristics: Double sealing protection: metal flat seal + NBR O-ring combination, suitable for high-pressure hydraulic systems, preventing oil leakage and external dust and moisture intrusion, ensuring the cleanliness and stable operation of internal components.

Precise Positioning Design: Equipped with a positioning stop for quick alignment during installation, preventing misalignment that could lead to sealing failure. Evenly distributed bolt holes ensure balanced stress after tightening, reducing deformation and making it suitable for the frequent vibrations of construction machinery.

Compatibility: Compatible with the main pump port, gearbox end cover, and other parts of Caterpillar 320D, 323D, and 325D excavators and 966K loaders. Adapts to SAE J518 standard flanges, offering strong versatility and easy installation.

Compatible Models and Application Scenarios:

Excavators: Hydraulic pump output end, boom cylinder port, and swing motor end cover for 320D, 323D, and 325D models, providing sealing protection against high pressure and vibration, ensuring the hydraulic system’s tightness.

Loaders: Gearbox end cover and hydraulic cylinder port for 966K and 972K models, providing dust and water protection to prevent oil leakage, suitable for heavy-duty and frequent start-stop conditions.

Other: Compatible with the hydraulic system ports of some Caterpillar bulldozers and graders, meeting the sealing and protection requirements under high pressure and harsh working conditions.

Installation and Maintenance Points (Original Data)

Installation: Clean the sealing surface and O-ring, ensuring they are free of oil, metal shavings, or scratches. Inspect the end cap for deformation and cracks, and the O-ring for damage and aging.

When installing the O-ring, apply a small amount of hydraulic oil, align the positioning stop with the port, and tighten the bolts evenly. The tightening torque is 45-50 N·m, avoiding excessive localized force that could deform the sealing surface.

After installation, perform a pressure test (pressure 35 MPa, hold for 5 minutes). No leakage indicates合格 (qualified). Run the machine for 1 hour, monitoring for abnormal heating and leakage.

Maintenance: Check the end cap tightness and sealing condition every 1000 hours. Tighten any loose bolts immediately. Replace any aged or damaged O-rings immediately.

Use specialized tools for disassembly to avoid prying hard, which could deform the end cap or damage the sealing surface. Do not use brute force to strike, as this could damage the components.