CAT 383-2830 CAP – LOWER

CAT 383-2830 is a Caterpillar engine front gear chamber lower cover, compatible with Cat C7.1, C9.3 and other engines. Its core function is to seal the bottom of the gear chamber, protect the crankshaft timing gear and oil pump drive mechanism, prevent oil leakage and impurity intrusion, and adapt to vibration, high temperature and other operating conditions. It is a key sealing and protective component of the engine front transmission and lubrication system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 383-2830, Type: Lower cover of front gear chamber, Material: Q235 carbon steel (surface electrophoretic coating), Single weight: approx. 2.8 kg, Applicable temperature: -40℃ to +180℃, Sealing method: rubber lip seal + gasket combination, Bolt specification: M8×25, Torque: 22±3 N・m, Matching seal model: 383-2831 (rubber gasket)

Key Dimensions
Length: 290 mm (tolerance ±0.2 mm), Width: 180 mm (tolerance ±0.2 mm), Thickness: 6 mm (tolerance ±0.1 mm), Number of mounting holes: 6, Hole spacing: 250 mm × 140 mm, Sealing groove depth: 1.8 mm (tolerance ±0.05 mm), Flatness: ≤0.12 mm, Surface roughness: Ra≤3.2 μm

Compatible Models and Applications
Compatible with Cat For C7.1 and C9.3 engines, 320GC and 323GC excavators, and 950GC loaders, this cover is installed at the bottom of the engine’s front gear chamber to protect the crankshaft timing gear, oil pump drive gear, and front-end transmission mechanism. It prevents oil leakage and the ingress of dust and moisture, ensuring the stability of the timing transmission and lubrication system.

Performance Parameters: Tensile strength ≥420 MPa, Yield strength ≥235 MPa, Salt spray resistance ≥500 hours, Gasket material: Fluororubber (FKM), Oil temperature resistance: -20℃ to +150℃, Compression ratio: 18% – 28%, Rebound rate ≥55%, Sealing lip hardness: HS 70±5

Structural and Performance Advantages:
Double sealing protection: Carbon steel body with electrophoretic coating for corrosion resistance; Fluororubber gasket + lip seal combination, suitable for engine vibration and high-temperature conditions, ensuring reliable sealing and reducing the risk of oil leakage by approximately 80% compared to ordinary cover plates.

Comprehensive Transmission Protection: An integrated cover structure covers the bottom of the gear chamber, preventing stones, mud, and other impurities from impacting the timing gear and drive mechanism, reducing component wear and extending service life.

Efficient and Precise Installation: Standardized hole positions and bolt specifications, along with locating pins for easy on-site replacement, and anti-loosening washers ensure long-term stability and reduce maintenance time.

High Adaptability: Compatible with the front gear chamber structures of multiple Cat engines, offering high versatility, facilitating service station inventory management, and reducing the variety of items required.