CAT 259-9282 235mm Outer Diameter Bearing Cap

CAT 259-9282 is the Caterpillar engine oil pan lower cover, which is compatible with Cat C7.1, C9.3 and other engines. Its core function is to seal the bottom of the oil pan, protect the oil pump and filter, prevent oil leakage and impurities from entering, and is suitable for heavy load and vibration conditions. It is a key seal in the engine lubrication system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 259-9282, Type: Oil pan cover, Material: Q235 carbon steel (powder coated), Weight: Approx. 3.2 kg, Applicable Temperature: -40℃ to +150℃, Sealing Type: Gasket seal (matching gasket 425-0712), Bolt Specification: M10×35, Torque: 35±5 N・m

Key Dimensions
Length: 420 mm (tolerance ±0.2 mm), Width: 280 mm (tolerance ±0.2 mm), Thickness: 8 mm (tolerance ±0.1 mm), Number of Mounting Holes: 8, Hole Spacing: 380 mm × 240 mm, Sealing Groove Depth: 2 mm (tolerance ±0.05 mm), Flatness: ≤0.15 mm, Surface Roughness: Ra≤3.2 μm

Compatible Models and Applications
Compatible with Cat C7.1, C9.3 Engines, 320GC and 323GC excavators, 950GC loaders. Used for sealing the bottom of the oil pan. Matching parts include gaskets, mounting bolts, and anti-loosening washers. Protects the bottom of the oil pump, filter, and crankshaft connecting rod mechanism, preventing oil leakage and the ingress of dust and moisture.

Performance Parameters: Tensile strength ≥420 MPa, Yield strength ≥235 MPa, Salt spray resistance ≥480 hours, Gasket material: Nitrile rubber (NBR), Oil temperature resistance -30℃ to +120℃, Compression ratio 15% – 25%, Resilience ≥50%.

Structural and Performance Advantages:
Reliable Sealing: Carbon steel material with powder coating provides both strength and corrosion resistance. Matching nitrile rubber gaskets adapt to engine vibration conditions, preventing oil leakage and ensuring stable lubrication system pressure.

Strong Protection: Integrated cover structure covers the bottom of the oil pan, protecting the oil pump and filter from impacts from stones, mud, and other impurities, extending component lifespan.

Easy Installation: Standardized mounting holes and bolt specifications allow for quick on-site replacement. Anti-loosening washers ensure long-term stability and reduce maintenance costs.

Wide Compatibility: Compatible with multiple engines including Cat C7.1 and C9.3, adaptable to different engine oil pan structures, offering strong versatility and easy inventory management.

Installation and Maintenance Points: Before installation, clean the lower cover, oil pan sealing surface, and bolt holes. Check the lower cover for deformation, cracks, and coating peeling. When installing gaskets, ensure there are no wrinkles or damage. Tighten bolts diagonally in 2-3 stages to the specified torque to avoid uneven stress that could lead to leakage.

Every 500 hours of maintenance, check the lower cover seal for oil leaks and bolts for looseness. Replace gaskets promptly if they are aged, hardened, or damaged to prevent oil leaks that could cause engine malfunctions.

Prioritize genuine parts for replacement. Aftermarket parts must have guaranteed material strength and sealing groove precision. Inferior lower covers may cause oil leaks due to deformation or poor sealing, affecting the normal operation of the engine lubrication system.