Product Introduction:

The C15AB-4W2448+A is an engine oil pump assembly designed for Shangchai (SDEC) C6121 diesel engines . This part is also cross-compatible with Caterpillar 3306B engines and is commonly used in Shantui bulldozers and Shandong Lingong loaders . The assembly is often supplied with two gear wheels for installation .

1. Installation Location
The oil pump is located inside the timing gear housing, at the lower section . Its intermediate gear meshes directly with the crankshaft gear, driving the pump to circulate engine oil .

2. Function
The pump draws oil from the sump and pressurizes it, sending it through the engine's main oil gallery to lubricate and cool critical components such as bearings, pistons, and the camshaft . It is a gear-type pump, known for its durability and consistent flow delivery .

3. Maintenance and Service
Common symptoms of a failing pump include low oil pressure, engine knocking, and in severe cases, bearing seizure (scuffing) . Conversely, excessively high oil pressure can also occur if the pressure relief valve sticks, leading to oil seal leaks . This assembly is a critical engine component and is typically replaced as a complete unit if worn or damaged; internal repair in the field is not recommended.

4. Important Notes
Always verify the part number C15AB-4W2448+A matches the original component for the specific engine model (C6121 or SC11CB) . Confirming the engine model and application (e.g., Shantui SD16) before installation is advisable to ensure correct fitment . Use a new gasket or seal during installation.